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AN431

2.5 ADJUSTABLE SHUNT REGULATOR in SOT23

Datasheet

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Description

The AN431 series ICs are three-terminal adjustable shunt regulators with guaranteed thermal stability over a full operation range. These ICs feature sharp turn-on characteristics, low temperature coefficient and low output impedance, which make them ideal substitutes for Zener diodes in applications such as switching power supply, charger and other adjustable regulators. The output voltage of these ICs can be set to any value between VREF (2.5V) and the maximum cathode voltage (36V). The AN431 precision reference is offered in two voltage tolerance: 0.5% and 1.0%.

Feature(s)

Programmable Precise Output Voltage from 2.5V to 36V

High Stability under Capacitive Load

Low Temperature Deviation: 4.5mV Typical

Low Equivalent Full-range Temperature Coefficient with 20PPM/oC Typical

Low Dynamic Output Resistance: 0.15Ω typical

Sink Current Capacity from 1mA to 100mA

Low Output Noise

Wide Operating Range of -40 to +125°C

Application(s)

Charger

Voltage Adapter

Switching Power Supply

Graphic Card

Precision Voltage Reference

Specifications & Technical Documents

Product Parameters

Type	Shunt regulator
Compliance (Only Automotive Supports PPAP)	Standard
AEC Qualified	No
ReferenceVoltage (V)	2.5 V
Tolerance (%)	0.5, 1 %
Sink Current (mA)	100 mA
MaximumInput Voltage (V)	36
Minimum Cathode Current for Regulation Typ (µA)	400 µA
Typical Temperature Coefficient (ppm/°C)	11 ppm/°C
Maximum Slope Resistance (Ω)	0.5 Ω

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products
PCN-2654	2024-02-15	2024-04-28	Device End of Life (EOL)
PCN-2514	2021-03-09	2021-06-09	Additional Wafer Source JKFAB