NE556 Dual Timer IC: Circuit, Pinout and Datasheet
5V 555 Type, Timer/Oscillator (Dual) Programmable Timers NE556 14 Pins 500kHz 5V 14-DIP (0.300, 7.62mm)









5V 555 Type, Timer/Oscillator (Dual) Programmable Timers NE556 14 Pins 500kHz 5V 14-DIP (0.300, 7.62mm)
Hello, everyone. Welcome to the new post today. NE556 is a General Purpose Dual Bopolar Timers IC. This article mainly introduce its circuit, pinout, datasheet and other detailed information about STMicroelectronics NE556.

NE556 Sequential Timer Circuit
NE556 Description
The NE556 dual single-chip timing circuit is a highly stable controller that can generate accurate Time delay or oscillation. In delay mode Operation, time is precisely controlled An external resistor and capacitor. For stability Runs as an oscillator with accurate free-running frequency and duty cycle Controlled by two external resistors and one capacitor. The circuit may be triggered and reset on falling Waveform, the output structure can be source or The current can reach 200mA.
NE556 Pinout
NE556 has total 14 pins, seven on right and seven on the left side of the base.
NE556 Pinout is shown in the figure given below.

NE556 Features
Specifications
- TypeParameter
- 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.
Through Hole - 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.
Through Hole - Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
14-DIP (0.300, 7.62mm) - Number of Pins14
- Weight1.620005g
- 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.
0°C~70°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.
Tube - 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 - 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 Terminations14
- 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 - Type555 Type, Timer/Oscillator (Dual)
- 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.
Nickel/Palladium/Gold (Ni/Pd/Au) - 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.
4.5V~16V - Number of Functions2
- 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.
5V - Current Rating
Current rating is the maximum current that a fuse will carry for an indefinite period without too much deterioration of the fuse element.
20A - Frequency
In electronic components, the parameter "Frequency" refers to the rate at which a signal oscillates or cycles within a given period of time. It is typically measured in Hertz (Hz) and represents how many times a signal completes a full cycle in one second. Frequency is a crucial aspect in electronic components as it determines the behavior and performance of various devices such as oscillators, filters, and communication systems. Understanding the frequency characteristics of components is essential for designing and analyzing electronic circuits to ensure proper functionality and compatibility with other components in a system.
500kHz - 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.
NE556 - Pin Count
a count of all of the component leads (or pins)
14 - Supply Voltage-Max (Vsup)
The parameter "Supply Voltage-Max (Vsup)" in electronic components refers to the maximum voltage that can be safely applied to the component without causing damage. It is an important specification to consider when designing or using electronic circuits to ensure the component operates within its safe operating limits. Exceeding the maximum supply voltage can lead to overheating, component failure, or even permanent damage. It is crucial to adhere to the specified maximum supply voltage to ensure the reliable and safe operation of the electronic component.
16V - Power Supplies
an electronic circuit that converts the voltage of an alternating current (AC) into a direct current (DC) voltage.?
5/15V - 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.
4.5V - Number of Channels2
- 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.
20mA - 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.
20mA - Output Current
The rated output current is the maximum load current that a power supply can provide at a specified ambient temperature. A power supply can never provide more current that it's rated output current unless there is a fault, such as short circuit at the load.
200mA - Quiescent Current
The quiescent current is defined as the current level in the amplifier when it is producing an output of zero.
4mA - High Level Output Current
High-level Output Current IOH The current flowing into the output at a specified high- level voltage. Low-level Output Current IOL The current flowing into the output at a specified low- level output voltage.
-200mA - Low Level Output Current
The current into the output terminal with input conditions applied that, according to the product specification, will establish a low level at the output.
200mA - Height3.3mm
- Length19.05mm
- Width6.35mm
- 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 - 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
NE556 Block Diagram
Having a look at its block diagram, we can better understand NE556's working principle.

NE556 Schematic Diagram

NE556 Alternatives

Where to use NE556?
The NE556 IC is the dual version of NE555 IC, meaning the NE556 has two timers inside it. As we know 555 ICs have been used for a long time now due to their reliable properties and applications. The NE556 can also be used for all those application additionally since this works with CMOS technology we can have two timers inside a single package with improved characteristics.
So if you are looking for a modern replacement for the 555 Timer IC then NE556 might be the right choice for you.
How to use NE556?
Application wise both NE555 and NE556 are one and the same, so if you want to know the basic of the Timer IC then read through the NE555 page. Since the NE556 is a 14-pin dual timer package there are two sets of all the timer pins (Threshold, Out, Trigger, Control Voltage, Discharge) and both the timer share the same Vcc and ground pins.
Timer IC’s are the most commonly used ICs for timing and Pulse generation applications. They can adopt itself into various applications due to its different operating modes. They are very simple to understand and if we take a look at the components present inside as shown below.

There are three resistors of value 5K, which gives this IC it’s iconic name “555 Timer”. It has dual comparators and flip-flop which will make this IC operated in three different modes such as Astable, Monostable and Bistable(Schimitt) Mode.
NE556 Typical Application

50% DUTY CYCLE OSCILLATOR

ASTABLE OPERATION

MONOSTABLE OPERATION

PULSE WIDTH MODULATOR

TONE BURST GENERATOR
NE556 Applications
Applications play an important role in a device. Ne556 has the following applications.
■Pulse shaping circuit
■Tone generator
■Divider
■Missing pixel
■detectorIndustrial control
■Touch toe encoder
NE556 Manufacturer
STMicroelectronics is a global independent semiconductor company and is a leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivaled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence trends.
Where to buy NE556?
On the internet, you can purchase NE556 from places like Amazon and eBay... Alternatively, you can purchase it on our website, where you will find a free datasheet to download as well as substitute parts to maintain regular manufacturing. The information is updated and supplemented on a regular basis.
Welcome to Utmel's RFQ page: https://www.utmel.com/rfq
Trend Analysis
Datasheet PDF
- Datasheets :
1.What is the working principle of NE556?
NE556=NE555 X 2 is a dual time base integrated circuit. There are two 555 time base circuits inside NE556, because they are packaged in one chip, they can get better consistency. In addition, NE556 is a bipolar circuit with a large output drive capability, the output current can reach 200MA, and the operating frequency range can reach 01001Hz~500kHz.
2.If I use NE556 as a single delay circuit, what should I do with the rest of the pins?
The unused feet can completely ignore it.
3.How to test the quality of NE556 in the circuit, only have the digital meter?
Use DC5V power supply, after a resistance attenuation, a button, connect one end of the optocoupler input, the other end is grounded, one end of the optocoupler output end is connected to +5V via a pull-up resistor, the other end is connected to the LED display, and LED- is grounded.
4.How to call NE556 in multisim10?
NE556 is a dual-channel timer, while 555 is a single-channel timer. There is no NE556 in multisim10, so two 555 timers can be used instead of one NE556.
5.What’s the difference between the dual time base integrated chip LM556 and NE556?
There are subtle differences. If used as an oscillator, NE is more stable than LM.
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