Sensirion AG SHT11 Sensor Technical Specs and Features
SENSOR, HUMIDITY & TEMP, 3.3V
Sensirion AG SHT11 sensor offers high-accuracy temperature and humidity measurement, low power use, digital output, and compact design for easy integration.
Product Introduction
The sensirion ag sht11 functions as a high-precision digital temperature and humidity sensor. This device delivers a fully calibrated digital output, which helps users achieve accurate readings in real time. Its compact design fits easily into small spaces. Many engineers choose the sensirion ag sht11 for projects that demand reliable and precise measurements. The sensor serves in areas where stable temperature and humidity tracking matter most.
Users benefit from the sensirion ag sht11’s high accuracy and space-saving package in demanding environments.
Sensirion AG SHT11 Features
Digital Output
The sensirion ag sht11 stands out as a high-precision digital temperature and humidity sensor. It delivers a fully calibrated digital output, which means users receive accurate data without extra calibration steps. The sensor uses CMOSens® technology and a 14-bit analog-to-digital converter. This design ensures strong signal quality and fast response times. The digital interface resists noise and external disturbances, so the sensor maintains reliable readings even in challenging environments.
The sensor integrates signal amplification, A/D conversion, and calibration memory on a single chip.
Each unit stores calibration coefficients onboard, which guarantees consistent accuracy.
The two-wire serial interface allows for easy and fast system integration.
The digital output simplifies data collection and improves accuracy compared to analog sensors.
High Accuracy
The sensirion ag sht11 provides precise measurements for both temperature and humidity. Each sensor undergoes individual calibration in a controlled humidity chamber. The calibration data is stored inside the sensor, so users do not need to perform external calibration. This process ensures every sensor delivers consistent and reliable results. The combined temperature and capacitive humidity sensing unit also enables accurate dewpoint calculations.
Low Power
Engineers value the sensor’s low power consumption. The sensirion ag sht11 operates efficiently, making it suitable for battery-powered devices. The sensor’s design reduces energy use while maintaining high performance. This feature helps extend the life of portable and remote monitoring systems.
Compact Package
The sensor comes in a small, lightweight package. Its compact size allows for easy installation in tight spaces. Designers can integrate the sensor into a wide range of products without worrying about space constraints. The robust package also protects the sensor, ensuring long-term stability and durability.
Technical Specifications
Measurement Range
The sensirion ag sht11 sensor measures both temperature and humidity across wide ranges. It can sense temperatures from -40°C up to +123.8°C. This range covers most indoor and outdoor environments. For humidity, the sensor detects from 0% to 100% relative humidity. This means it works well in dry and very humid conditions. The sensor’s high resolution allows it to detect small changes, making it useful for precise monitoring.
The sensor’s broad measurement range supports many applications, from weather stations to industrial controls.
Accuracy
Accuracy is a key part of the technical specifications for this sensor. The sensirion ag sht11 provides typical humidity accuracy of ±3% RH at 25°C. For temperature, the accuracy is ±0.3°C within the range of -30°C to +100°C. The sensor repeats measurements with a precision of ±0.1% RH for humidity and ±0.1°C for temperature. It also offers a fine resolution of 0.01 for both humidity and temperature readings. The sensor uses a band-gap temperature sensor to achieve this level of precision.
| Parameter | Typical Accuracy | Specified Range | Units |
|---|---|---|---|
| Humidity Accuracy | ±3 %RH (at 25°C) | 0 to 100 %RH | %RH |
| Temperature Accuracy | ±0.3 °C | -30 to +100 °C | °C |
| Humidity Repeatability | ±0.1 %RH | %RH | |
| Temperature Repeatability | ±0.1 °C | °C | |
| Resolution | 0.01 | °C/%RH |
Supply Voltage
The sensor operates over a wide supply voltage range. It works with voltages from 2.4 V to 5.5 V. Most users choose 3.3 V or 5 V for stable operation. This flexibility allows the sensor to fit into many different electronic systems.
Minimum voltage: 2.4 V
Typical voltage: 3.3 V
Maximum voltage: 5.5 V
Current Consumption
The sensirion ag sht11 uses very little power. During normal operation, it draws about 28 microamperes (μA) on average. At its highest, the current can reach 1000 μA. When powered at 3 V, the sensor uses only about 80 microwatts (μW). This low current makes it ideal for battery-powered devices and helps ensure long-term stability in remote monitoring systems.
Interface
The sensor communicates with microcontrollers using a two-wire serial digital interface. This interface, called Sensibus, looks similar to I2C but uses a unique protocol. The sensor connects through two lines: SCL (clock) and SDA (data). Pull-up resistors are needed on these lines. The interface supports fast data transfer and reliable communication, but it requires a custom software driver instead of standard I2C hardware support.
Dimensions
The compact package of the sensirion ag sht11 makes it easy to fit into small spaces. The sensor comes in a Leadless Chip Carrier (LCC) package. Its dimensions are:
| Dimension | Measurement (mm) | Measurement (inches) |
|---|---|---|
| Length | 12.69 | 0.50 |
| Width | 11.16 | 0.44 |
| Height | 11.56 | 0.46 |
| Weight | 1.03 g | 0.04 oz |
The small size and light weight help designers add the sensor to many products without space concerns.
Pinout
Pin Configuration
The Sensirion AG SHT11 sensor uses a simple pin configuration that supports easy integration into electronic systems. The sensor typically features four pins. Each pin serves a specific function in the operation and communication of the device. The table below outlines the common pin assignments and their roles:
| Pin Name | Pin Number | Function |
|---|---|---|
| VDD | 1 | Power supply (2.4V to 5.5V) |
| DATA | 2 | Serial data line for communication |
| SCK | 3 | Serial clock line for timing data transfer |
| GND | 4 | Ground connection |
The DATA pin handles bidirectional data communication between the sensor and the microcontroller. The SCK pin provides the clock signal that synchronizes data transfer. VDD supplies power, while GND ensures a stable ground reference. The clock pin can be shared among multiple sensors, but each sensor requires its own data pin for proper operation.
The straightforward pin layout allows for quick setup and reliable connections in most projects.
Wiring Basics
Proper wiring ensures the SHT11 sensor operates accurately and reliably. The following steps outline the recommended wiring practices:
Connect VDD to a stable power source, such as 3.3V or 5V, within the sensor’s specified voltage range.
Attach GND to the ground of the microcontroller or data acquisition system.
Link the DATA pin to a general-purpose input/output (GPIO) pin on the microcontroller. This pin must support the Sensibus protocol.
Connect the SCK pin to another GPIO pin configured for clock signals.
Use pull-up resistors on the DATA line if required by the circuit design.
Keep the DATA line stable while the SCK line is high to prevent communication errors.
Double-check all connections before powering the system to avoid initialization failures.
The SHT11 sensor uses a proprietary two-wire protocol. The microcontroller must implement this protocol in software to ensure accurate readings. Stable power and correct wiring help prevent common issues and support long-term sensor performance.
Careful wiring and protocol implementation help users achieve the best results from the SHT11 sensor.
Applications
HVAC
Heating, ventilation, and air conditioning (HVAC) systems rely on accurate sensors to maintain comfortable indoor environments. The Sensirion AG SHT11 sensor plays a key role in these systems. It measures both humidity and temperature with high precision. Many HVAC systems use the SHT11 to control humidifiers and dehumidifiers. The sensor connects to an embedded controller using a two-wire interface. This controller reads the sensor data and manages relays that switch power to the humidification devices. When the humidity drops below a set point, the system activates the humidifier. If the humidity rises too high, the dehumidifier turns on. The SHT11 ensures that only one device operates at a time, which helps maintain indoor air quality and prevents energy waste.
The SHT11 sensor helps HVAC systems keep indoor air comfortable and healthy by controlling humidity levels automatically.
Automotive
Automotive manufacturers use the SHT11 sensor in climate control systems. The sensor monitors cabin temperature and humidity, allowing the vehicle to adjust air conditioning and heating for passenger comfort. Some vehicles use the sensor to prevent window fogging by detecting high humidity inside the cabin. The SHT11’s compact size fits well in tight automotive spaces. Its digital output resists electrical noise, which is common in vehicles. This reliability makes it a popular choice for modern automotive climate systems.
The sensor supports automatic climate adjustments.
It helps improve passenger comfort and safety.
Monitoring
The Sensirion AG SHT11 sensor appears in many environmental monitoring applications. Urban air quality stations use the sensor to measure temperature, humidity, and dew point. These measurements help cities track pollution and weather changes. In industrial settings, the SHT11 supports worker safety by monitoring indoor air quality. Wearable devices use the sensor to collect environmental data in real time. The sensor’s wide measurement range and accuracy make it suitable for both indoor and outdoor monitoring tasks.
The SHT11 sensor provides reliable data for smart environment monitoring, supporting both public health and workplace safety.
Troubleshooting
Common Issues
Users sometimes face communication problems when working with the Sensirion AG SHT11 sensor. The sensor uses a special two-wire protocol that looks like I2C but works differently. Many common issues come from these differences:
The sensor does not use device addressing, so only one sensor can share a data and clock line. Each sensor needs its own clock line if multiple sensors are used.
Standard I2C libraries do not work because the SHT11 does not send an ACK or NACK after every 8 bits. This can confuse microcontrollers that expect normal I2C behavior.
Long cables between the sensor and the device can cause signal loss or errors. For example, using a 70-foot Ethernet cable often leads to poor data and clock signals.
Power supply problems, such as unstable voltage, can cause the sensor to reset or give wrong readings.
Environmental factors also affect the sensor’s accuracy. The table below shows how different conditions can change the sensor’s performance:
| Environmental Factor | Effect on SHT11 Accuracy |
|---|---|
| Temperature | Readings may drift at extreme temperatures. Calibration helps keep accuracy over the full range. |
| Relative Humidity | Accuracy drops below 20% RH and above 80-90% RH. Best results appear between 20% and 80% RH. |
| Self-heating | The sensor can heat itself during operation, which may change local readings. |
Note: Keeping cables short and using stable power helps prevent most communication errors.
Best Practices
To get the best results from the SHT11 sensor, users should follow these tips:
Use short cables to connect the sensor. This keeps signals strong and reduces errors.
Write custom software for the sensor’s protocol. Standard I2C code will not work.
Place the sensor in areas with stable temperature and humidity. Avoid spots with rapid changes or direct sunlight.
Calibrate the sensor if used in extreme environments. Regular calibration keeps readings accurate.
Provide a clean and stable power supply. Voltage drops or spikes can cause problems.
Allow the sensor to rest between readings. This reduces self-heating and keeps measurements true.
Following these practices helps the SHT11 sensor deliver reliable and accurate data in any project.
The Sensirion AG SHT11 sensor offers high accuracy, low power use, and a compact design. It measures temperature and humidity with fully calibrated digital output. Many engineers use it in weather stations, HVAC systems, and data loggers. The sensor works well in embedded and IoT projects because it fits small spaces and connects easily to microcontrollers.
For projects that need reliable and precise environmental monitoring, the SHT11 stands out as a smart choice.
FAQ
How does the SHT11 sensor connect to a microcontroller?
The SHT11 sensor uses two pins for communication: DATA and SCK. A microcontroller connects to these pins using general-purpose input/output (GPIO) lines. Pull-up resistors help keep the signals stable.
Can the SHT11 sensor measure both temperature and humidity at the same time?
Yes. The SHT11 sensor measures temperature and humidity during each reading. It sends both values as digital data to the microcontroller.
What is the typical response time for the SHT11 sensor?
The SHT11 sensor responds quickly. It usually takes about 4 seconds to measure humidity and less than 1 second for temperature.
Does the SHT11 sensor need calibration before use?
No. Each SHT11 sensor comes factory-calibrated. The calibration data is stored inside the sensor, so users do not need to calibrate it before using.
Specifications
- TypeParameter
- Factory Lead Time2 Weeks
- Mount
In electronic components, the term "Mount" typically refers to the method or process of physically attaching or fixing a component onto a circuit board or other electronic device. This can involve soldering, adhesive bonding, or other techniques to secure the component in place. The mounting process is crucial for ensuring proper electrical connections and mechanical stability within the electronic system. Different components may have specific mounting requirements based on their size, shape, and function, and manufacturers provide guidelines for proper mounting procedures to ensure optimal performance and reliability of the electronic device.
Surface Mount - Mounting Type
The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.
Surface Mount - Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
10-SMD Module - Number of Pins8
- Operating Temperature
The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.
-40°C~123°C - Packaging
Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.
Tape & Reel (TR) - Series
In electronic components, the "Series" refers to a group of products that share similar characteristics, designs, or functionalities, often produced by the same manufacturer. These components within a series typically have common specifications but may vary in terms of voltage, power, or packaging to meet different application needs. The series name helps identify and differentiate between various product lines within a manufacturer's catalog.
SHT1 - Published2007
- JESD-609 Code
The "JESD-609 Code" in electronic components refers to a standardized marking code that indicates the lead-free solder composition and finish of electronic components for compliance with environmental regulations.
e4 - Pbfree Code
The "Pbfree Code" parameter in electronic components refers to the code or marking used to indicate that the component is lead-free. Lead (Pb) is a toxic substance that has been widely used in electronic components for many years, but due to environmental concerns, there has been a shift towards lead-free alternatives. The Pbfree Code helps manufacturers and users easily identify components that do not contain lead, ensuring compliance with regulations and promoting environmentally friendly practices. It is important to pay attention to the Pbfree Code when selecting electronic components to ensure they meet the necessary requirements for lead-free applications.
yes - Part Status
Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.
Obsolete - Moisture Sensitivity Level (MSL)
Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures
1 (Unlimited) - Number of Terminations8
- Terminal Finish
Terminal Finish refers to the surface treatment applied to the terminals or leads of electronic components to enhance their performance and longevity. It can improve solderability, corrosion resistance, and overall reliability of the connection in electronic assemblies. Common finishes include nickel, gold, and tin, each possessing distinct properties suitable for various applications. The choice of terminal finish can significantly impact the durability and effectiveness of electronic devices.
GOLD (AU) - WITH NICKEL (NI) BARRIER - Voltage - Supply
Voltage - Supply refers to the range of voltage levels that an electronic component or circuit is designed to operate with. It indicates the minimum and maximum supply voltage that can be applied for the device to function properly. Providing supply voltages outside this range can lead to malfunction, damage, or reduced performance. This parameter is critical for ensuring compatibility between different components in a circuit.
2.4V~5.5V - Output
In electronic components, the parameter "Output" typically refers to the signal or data that is produced by the component and sent to another part of the circuit or system. The output can be in the form of voltage, current, frequency, or any other measurable quantity depending on the specific component. The output of a component is often crucial in determining its functionality and how it interacts with other components in the circuit. Understanding the output characteristics of electronic components is essential for designing and troubleshooting electronic circuits effectively.
12b - Lead Pitch
Lead pitch in electronic components refers to the distance between the center of one lead (or pin) of a component to the center of the adjacent lead. It is an important parameter to consider when designing and assembling electronic circuits, as it determines the spacing required on a circuit board for proper placement and soldering of the component. Lead pitch is typically specified in millimeters or inches and can vary depending on the type of component, such as integrated circuits, resistors, capacitors, and connectors. Choosing the correct lead pitch ensures proper alignment and connection of components on a circuit board, ultimately affecting the functionality and reliability of the electronic device.
1.27mm - Body Breadth
Body breadth in electronic components refers to the width of the physical body of a component, such as a resistor, capacitor, or integrated circuit. This measurement is crucial for ensuring proper fit within a circuit board or enclosure. It can affect the component's thermal performance, mechanical stability, and overall compatibility with other components in a design. Body breadth is typically specified in millimeters or inches and is an important factor in the selection and design of electronic assemblies.
4.93 mm - Output Type
The "Output Type" parameter in electronic components refers to the type of signal or data that is produced by the component as an output. This parameter specifies the nature of the output signal, such as analog or digital, and can also include details about the voltage levels, current levels, frequency, and other characteristics of the output signal. Understanding the output type of a component is crucial for ensuring compatibility with other components in a circuit or system, as well as for determining how the output signal can be utilized or processed further. In summary, the output type parameter provides essential information about the nature of the signal that is generated by the electronic component as its output.
Digital - Operating Supply Voltage
The voltage level by which an electrical system is designated and to which certain operating characteristics of the system are related.
3.3V - Power Supplies
an electronic circuit that converts the voltage of an alternating current (AC) into a direct current (DC) voltage.?
5V - Interface
In electronic components, the term "Interface" refers to the point at which two different systems, devices, or components connect and interact with each other. It can involve physical connections such as ports, connectors, or cables, as well as communication protocols and standards that facilitate the exchange of data or signals between the connected entities. The interface serves as a bridge that enables seamless communication and interoperability between different parts of a system or between different systems altogether. Designing a reliable and efficient interface is crucial in ensuring proper functionality and performance of electronic components and systems.
Serial - Termination Type
Termination Type in electronic components refers to the method used to connect the component to a circuit board or other electronic devices. It specifies how the component's leads or terminals are designed for soldering or mounting onto a PCB. Common termination types include through-hole, surface mount, and wire lead terminations. The termination type is an important consideration when selecting components for a circuit design, as it determines how the component will be physically connected within the circuit. Different termination types offer varying levels of durability, ease of assembly, and suitability for specific applications.
SOLDER - Operating Supply Current
Operating Supply Current, also known as supply current or quiescent current, is a crucial parameter in electronic components that indicates the amount of current required for the device to operate under normal conditions. It represents the current drawn by the component from the power supply while it is functioning. This parameter is important for determining the power consumption of the component and is typically specified in datasheets to help designers calculate the overall power requirements of their circuits. Understanding the operating supply current is essential for ensuring proper functionality and efficiency of electronic systems.
1mA - Nominal Supply Current
Nominal current is the same as the rated current. It is the current drawn by the motor while delivering rated mechanical output at its shaft.
28μA - Number of Bits14
- Accuracy
Accuracy in electronic components refers to the degree to which a measured value agrees with the true or accepted value. It evaluates the precision of a component in providing correct output or measurement under specified conditions. High accuracy indicates minimal deviation from the actual value, while low accuracy shows significant error in measurement. This parameter is crucial in applications where precise data is essential for reliable performance and decision-making.
±3% RH - Response Time
the time taken for a circuit or measuring device, when subjected to a change in input signal, to change its state by a specified fraction of its total response to that change.
8s - Resolution
Resolution in electronic components refers to the smallest increment of measurement or change that can be detected or represented by the component. It is a crucial specification in devices such as sensors, displays, and converters, as it determines the level of detail or accuracy that can be achieved. For example, in a digital camera, resolution refers to the number of pixels that make up an image, with higher resolution indicating a greater level of detail. In analog-to-digital converters, resolution is the number of discrete values that can be represented in the digital output, determining the precision of the conversion process. Overall, resolution plays a significant role in determining the performance and capabilities of electronic components in various applications.
1.75 B - Sensor Type
In electronic components, the parameter "Sensor Type" refers to the specific type of sensor technology used in a particular component to detect and measure physical phenomena such as light, temperature, pressure, motion, or proximity. Different sensor types utilize various principles and mechanisms to convert the detected input into an electrical signal that can be processed by the electronic component. Common sensor types include photodiodes, thermistors, accelerometers, and proximity sensors, each designed for specific applications and environments. Understanding the sensor type is crucial for selecting the right component for a given task and ensuring accurate and reliable sensing capabilities in electronic systems.
Humidity, Temperature - Sensing Method
The sensing method in electronic components refers to the technique or mechanism used to detect and measure physical phenomena such as temperature, pressure, light, or motion. This includes a variety of technologies such as resistive, capacitive, inductive, and optical sensing methods. The choice of sensing method affects the accuracy, response time, and application suitability of the electronic component. It plays a crucial role in determining how effectively a device can interact with and interpret its environment.
Capacitive - Max Supply Voltage (DC)
The parameter "Max Supply Voltage (DC)" in electronic components refers to the maximum voltage that can be safely applied to the component without causing damage. This specification is crucial for ensuring the reliable operation and longevity of the component within a given circuit. Exceeding the maximum supply voltage can lead to overheating, breakdown of internal components, or even permanent damage. It is important to carefully adhere to this specification when designing or using electronic circuits to prevent potential failures and ensure the safety of the components.
5.5V - Min Supply Voltage (DC)
The parameter "Min Supply Voltage (DC)" in electronic components refers to the minimum voltage level required for the component to operate properly. It indicates the lowest voltage that can be safely applied to the component without causing damage or malfunction. This parameter is crucial for ensuring the reliable and stable operation of the component within its specified operating range. It is important for designers and engineers to adhere to the specified minimum supply voltage to prevent potential issues such as erratic behavior, reduced performance, or permanent damage to the component.
2.4V - Humidity Range
Humidity is a measure of the amount of water vapor in the air. Relative humidity measures the amount of water in the air in relation to the maximum amount of water vapor (moisture).
0 ~ 100% RH - Height2.5mm
- Length7.42mm
- Width4.88mm
- REACH SVHC
The parameter "REACH SVHC" in electronic components refers to the compliance with the Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH) regulation regarding Substances of Very High Concern (SVHC). SVHCs are substances that may have serious effects on human health or the environment, and their use is regulated under REACH to ensure their safe handling and minimize their impact.Manufacturers of electronic components need to declare if their products contain any SVHCs above a certain threshold concentration and provide information on the safe use of these substances. This information allows customers to make informed decisions about the potential risks associated with using the components and take appropriate measures to mitigate any hazards.Ensuring compliance with REACH SVHC requirements is essential for electronics manufacturers to meet regulatory standards, protect human health and the environment, and maintain transparency in their supply chain. It also demonstrates a commitment to sustainability and responsible manufacturing practices in the electronics industry.
No SVHC - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
ROHS3 Compliant - Lead Free
Lead Free is a term used to describe electronic components that do not contain lead as part of their composition. Lead is a toxic material that can have harmful effects on human health and the environment, so the electronics industry has been moving towards lead-free components to reduce these risks. Lead-free components are typically made using alternative materials such as silver, copper, and tin. Manufacturers must comply with regulations such as the Restriction of Hazardous Substances (RoHS) directive to ensure that their products are lead-free and environmentally friendly.
Lead Free
Datasheet PDF
- Datasheets :
- Environmental Information :
- PCN Obsolescence/ EOL :
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