MAX6675 Type-K Thermocouple Converter : Datasheet, Pinout, Comparison
10 Weeks weeks 8-SOIC (0.154, 3.90mm Width) Tape & Reel (TR) Active Sensor & Detector Interface ICs Thermocouple to Digital Converter Surface Mount 1 (Unlimited) ROHS3 Compliant









10 Weeks weeks 8-SOIC (0.154, 3.90mm Width) Tape & Reel (TR) Active Sensor & Detector Interface ICs Thermocouple to Digital Converter Surface Mount 1 (Unlimited) ROHS3 Compliant
This article will unlock more details about MAX6675, a cold-junction-compensated k-thermocouple to-digital converter.

How to use MAX6675 thermocouple k type with Arduino
MAX6675 Pinout

MAX6675 Pinout
| Pin | Pin Name | Function |
| 1 | GND | Ground |
| 2 | T. | Alumel Lead of Type-K Thermocouple.Should be connected to the ground externally. |
| 3 | T+ | Chrome Lead of TypeK Thermocouple |
| 4 | Vcc | Positive Supply. Bypass with a 0.1μF capacitor to GND. |
| 5 | SCK | Serial Clock Input |
| 6 | Cs | Chip Select Set CS low to enable the serial interface. |
| 7 | SO | Serial Data Output |
| 8 | N.C. | No Connection |
Pin Description
MAX6675 CAD Model
Symbol

Symbol
Footprint

Footprint
3D Model

3D Model
Specifications
- TypeParameter
- Factory Lead Time10 Weeks
- Contact Plating
Contact plating (finish) provides corrosion protection for base metals and optimizes the mechanical and electrical properties of the contact interfaces.
Tin - 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.
8-SOIC (0.154, 3.90mm Width) - 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.
-20°C~85°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) - Published2002
- 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.
e3 - 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.
Active - 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
- ECCN Code
An ECCN (Export Control Classification Number) is an alphanumeric code used by the U.S. Bureau of Industry and Security to identify and categorize electronic components and other dual-use items that may require an export license based on their technical characteristics and potential for military use.
EAR99 - TypeThermocouple to Digital Converter
- Terminal Position
In electronic components, the term "Terminal Position" refers to the physical location of the connection points on the component where external electrical connections can be made. These connection points, known as terminals, are typically used to attach wires, leads, or other components to the main body of the electronic component. The terminal position is important for ensuring proper connectivity and functionality of the component within a circuit. It is often specified in technical datasheets or component specifications to help designers and engineers understand how to properly integrate the component into their circuit designs.
DUAL - Terminal Form
Occurring at or forming the end of a series, succession, or the like; closing; concluding.
GULL WING - Peak Reflow Temperature (Cel)
Peak Reflow Temperature (Cel) is a parameter that specifies the maximum temperature at which an electronic component can be exposed during the reflow soldering process. Reflow soldering is a common method used to attach electronic components to a circuit board. The Peak Reflow Temperature is crucial because it ensures that the component is not damaged or degraded during the soldering process. Exceeding the specified Peak Reflow Temperature can lead to issues such as component failure, reduced performance, or even permanent damage to the component. It is important for manufacturers and assemblers to adhere to the recommended Peak Reflow Temperature to ensure the reliability and functionality of the electronic components.
260 - Number of Functions1
- Supply Voltage
Supply voltage refers to the electrical potential difference provided to an electronic component or circuit. It is crucial for the proper operation of devices, as it powers their functions and determines performance characteristics. The supply voltage must be within specified limits to ensure reliability and prevent damage to components. Different electronic devices have specific supply voltage requirements, which can vary widely depending on their design and intended application.
3.3V - Terminal Pitch
The center distance from one pole to the next.
1.27mm - Base Part Number
The "Base Part Number" (BPN) in electronic components serves a similar purpose to the "Base Product Number." It refers to the primary identifier for a component that captures the essential characteristics shared by a group of similar components. The BPN provides a fundamental way to reference a family or series of components without specifying all the variations and specific details.
MAX6675 - Pin Count
a count of all of the component leads (or pins)
8 - 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.
5.5V - Supply Voltage-Min (Vsup)
The parameter "Supply Voltage-Min (Vsup)" in electronic components refers to the minimum voltage level required for the component to operate within its specified performance range. This parameter indicates the lowest voltage that can be safely applied to the component without risking damage or malfunction. It is crucial to ensure that the supply voltage provided to the component meets or exceeds this minimum value to ensure proper functionality and reliability. Failure to adhere to the specified minimum supply voltage may result in erratic behavior, reduced performance, or even permanent damage to the component.
3V - 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.
SPI, Serial - 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.
1.5mA - 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.
700μA - Input Type
Input type in electronic components refers to the classification of the signal or data that a component can accept for processing or conversion. It indicates whether the input is analog, digital, or a specific format such as TTL or CMOS. Understanding input type is crucial for ensuring compatibility between different electronic devices and circuits, as it determines how signals are interpreted and interacted with.
Thermocouple (K) - 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.
1.5 B - Height1.5mm
- Length5mm
- Width4mm
- Radiation Hardening
Radiation hardening is the process of making electronic components and circuits resistant to damage or malfunction caused by high levels of ionizing radiation, especially for environments in outer space (especially beyond the low Earth orbit), around nuclear reactors and particle accelerators, or during nuclear accidents or nuclear warfare.
No - 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
Parts with Similar Specs
- ImagePart NumberManufacturerPackage / CaseNumber of PinsInterfaceSupply VoltageNumber of TerminationsMoisture Sensitivity Level (MSL)Terminal PositionPeak Reflow Temperature (Cel)View Compare
MAX6675ISA T
8-SOIC (0.154, 3.90mm Width)
8
SPI, Serial
3.3 V
8
1 (Unlimited)
DUAL
260
8-SOIC (0.209, 5.30mm Width)
8
Serial, UART
3 V
8
1 (Unlimited)
DUAL
260
8-SOIC (0.154, 3.90mm Width)
8
CAN, Serial
5 V
8
1 (Unlimited)
DUAL
260
8-SOIC (0.154, 3.90mm Width)
8
CAN, Serial
5 V
8
1 (Unlimited)
DUAL
260
8-SOIC (0.154, 3.90mm Width)
-
-
5 V
8
1 (Unlimited)
DUAL
260
MAX6675 Description
The MAX6675 performs cold-junction compensation and digitizes the signal from a type-K thermocouple. The data is output in a 12-bit resolution, SPI™-compatible, read-only format. This converter resolves temperatures to 0.25°C, allows readings as high as +1024°C, and exhibits thermocouple accuracy of 8LSBs for temperatures ranging from 0°C to +700°C.
The MAX6675 is a sophisticated thermocouple-to-digital converter with a built-in 12-bit analog-to-digital converter (ADC). The MAX6675 also contains cold-junction compensation sensing and correction, a digital controller, an SPI-compatible interface, and associated control logic.
MAX6675 Features
● Direct Digital Conversion of Type -K Thermocouple Output
● Cold-Junction Compensation
● Simple SPI-Compatible Serial Interface
● 12-Bit, 0.25°C Resolution
● Open Thermocouple Detection
MAX6675 Application
● Industrial
● Appliances
● HVAC
MAX6675 Block Diagram

MAX6675 Block Diagram
MAX6675 Typical Application Circuit
The Typical Application Circuit shows the MAX6675 interfaced with a microcontroller. In this example, the MAX6675 processes the reading from the thermocouple and transmits the data through a serial interface. Force CS low and apply a clock signal at SCK to read the results at SO. Forcing CS low immediately stops any conversion process. Initiate a new conversion process by forcing CS high.

MAX6675 Typical Application Circuit
MAX6675 vs. MAX31855
| Parts | MAX6675 | MAX31855 |
| Pb-free Code | No | Yes |
| Rohs Code | No | Yes |
| Part Life Cycle Code | Obsolete | Active |
| Ihs Manufacturer | MAXIM INTEGRATED PRODUCTS INC | MAXIM INTEGRATED PRODUCTS INC |
| Part Package Code | SOIC | SOIC |
| Package Description | SOP, | SOP, SOP8,.25 |
| Pin Count | 8 | 8 |
| Reach Compliance Code | not_compliant | compliant |
| ECCN Code | EAR99 | EAR99 |
| HTS Code | 8542.39.00.01 | 8542.39.00.01 |
| Factory Lead Time | 1 Week | 7 Weeks |
| Samacsys Description | IC THERMOCOUPLE TO DGTL 8-SONIC | MAX31855KASA+, 14-bit Temperature Sensor ±2 °C SPI 3 → 3.6 V 8-Pin SOIC |
| Samacsys Manufacturer | Maxim Integrated | Maxim Integrated |
| Analog IC - Other Type | ANALOG CIRCUIT | ANALOG CIRCUIT |
| JESD-30 Code | R-PDSO-G8 | R-PDSO-G8 |
| JESD-609 Code | e0 | e3 |
| Length | 4.9 mm | 4.9 mm |
| Moisture Sensitivity Level | 1 | 1 |
| Number of Functions | 1 | 1 |
| Number of Terminals | 8 | 8 |
| Operating Temperature-Max | 85 °C | 125 °C |
| Operating Temperature-Min | -20 °C | -40 °C |
| Package Body Material | PLASTIC/EPOXY | PLASTIC/EPOXY |
| Package Code | SOP | SOP |
| Package Shape | RECTANGULAR | RECTANGULAR |
| Package Style | SMALL OUTLINE | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 245 | NOT SPECIFIED |
| Qualification Status | Not Qualified | Not Qualified |
| Seated Height-Max | 1.75 mm | 1.75 mm |
| Supply Voltage-Max (Vsup) | 5.5 V | 3.6 V |
| Supply Voltage-Min (Vsup) | 3 V | 3 V |
| Supply Voltage-Nom (Vsup) | 3.3 V | 3.3 V |
| Surface Mount | YES | YES |
| Technology | BICMOS | |
| Temperature Grade | OTHER | AUTOMOTIVE |
| Terminal Finish | Tin/Lead (Sn/Pb) | Matte Tin (Sn) |
| Terminal Form | GULLWING | GULLWING |
| Terminal Pitch | 1.27 mm | 1.27 mm |
| Terminal Position | DUAL | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED | NOT SPECIFIED |
| Width | 3.9 mm | 3.9 mm |
| Base Number Matches | 4 | 2 |
| Package Equivalence Code | SOP8,.25 | |
| Power Supplies | 3.3 V | |
| Supply Current-Max (Isup) | 1.5 mA |
MAX6675 vs. MAX31855
MAX6675 Manufacturer
Maxim Integrated Products, Inc. designs, develops, manufactures, and markets linear and mixed-signal integrated circuits. The Company offers switching regulators, battery management, amplifiers, data converters, filters, opticals, and memory products.
Datasheet PDF
- Datasheets :
- Application Notes :
- ConflictMineralStatement :
Trend Analysis
What difference is between MAX6675 and MAX31855?
The MAX6675 outputs 12 bits of data. The MAX31855 outputs 14 bits. That would indicate that the MAX31855 is more accurate. However, it has a wider range -250 to +1600 rather than 0 to 1024. So it has about 1 bit more resolution in practice. "1 bit" means it can see changes half the size of what the other can detect.
What is the max6675 designed to?
The MAX6675 is designed to work in conjunction with an external microcontroller (µC) or other intelligence in thermostatic, process-control, or monitoring applications.
How does the MAX6675 perform?
The MAX6675 performs cold-junction compensation and digitizes the signal from a type-K thermocouple. The data is output in a 12-bit resolution, SPI™-compatible, read-only format.
What package is the MAX6675 available in?
The MAX6675 is available in a small, 8-pin SO package.
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