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LM431ASF is listed in the Voltage Reference range at ChipApex. The manufacturer field lists TAEJIN. Its product description is IC VREF SHUNT ADJ 1% SOT23-3. Review the specifications below when checking this part for your BOM.
Voltage Reference specifications for LM431ASF
- Description：IC VREF SHUNT ADJ 1% SOT23-3
- Series：-
- Mfr：TAEJIN
- Package：Tape & Reel (TR)
- Output Type：Adjustable
- Voltage - Output (Min/Fixed)：2.5V
- Voltage - Output (Max)：40 V
- Current - Output：100 mA
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-236-3, SC-59, SOT-23-3
- Supplier Device Package：SOT-23-3L
- Grade：-
- Qualification：-
Voltage Reference datasheet and documents for LM431ASF
Voltage Reference Overview
The LM431ASF is a three-terminal programmable precision shunt regulator manufactured by Tae Jin Technology. It provides an adjustable output voltage ranging from the internal reference of 2.5V up to 40V using two external resistors. The device features a guaranteed reference voltage tolerance of 1% and operates with a cathode current range of 0.5mA to 100mA. It exhibits a typical dynamic output impedance of 0.2Ω and maintains thermal stability over a full operating temperature range of -40°C to +125°C.
Voltage Reference Feature Summary
- Programmable output voltage capability extending up to 40V via external resistor networks
- Temperature compensated design ensuring specified thermal stability across the entire operating range
- Fast turn-on response characteristics suitable for replacing Zener diodes in various applications
Voltage Reference Applications
- Shunt Regulator
- Precision High-Current Series Regulator
- Crowbar Circuit
- PWM Converter With Reference
- Voltage Monitor
Voltage Reference Procurement Notes
Verify the specific ordering suffix 'SF' corresponds to the SOT-23-3L package configuration required for your design. Confirm that the 1% tolerance designation matches your circuit accuracy requirements. Ensure the supplier documentation aligns with the manufacturer's latest revision notice regarding electrical characteristics updates.
Voltage Reference Selection Notes
Select this component when a low-cost, high-precision adjustable reference is needed for shunt regulation. The SOT-23-3L package offers space efficiency for surface-mount designs. Consider the 100mA continuous cathode current limit when designing for high-current load scenarios or series regulator configurations.
Voltage Reference Part Context
This device belongs to the LM431 family of three-terminal adjustable shunt regulators. It serves as a versatile alternative to fixed Zener diodes, offering superior temperature stability and lower dynamic impedance. The family is widely utilized in power supply feedback loops and precision monitoring circuits requiring reliable voltage referencing.
Voltage Reference Replacement Considerations
LM431CSF (0.5% Tolerance)
Voltage Reference FAQ
What is the minimum cathode current required for regulation?
The minimum cathode current for regulation is 0.5mA when the cathode voltage equals the reference voltage.
How does the LM431ASF handle temperature variations?
It is temperature compensated for operation over the full rate operating temperature range, with an equivalent full-range temperature coefficient of 50PPM/°C.
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