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AP431i (NRND)

NRND = Not Recommended for New Design

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Description

The AP431i is a three-terminal adjustable shunt regulator with guaranteed thermal stability over a full operation range. It features sharp turn-on characteristics, low temperature coefficient and low output impedance, which make it ideal substitute for Zener diode in applications such as switching power supply, charger and other adjustable regulators.

AP431i has the same electrical specifications as the industry standard 431 except that it features a low minimum cathode current for regulation. The typical value of 50μA makes the parts ideal for very low power dissipation applications.

Feature(s)

Low minimum operating current - Minimise operating current to save power dissipation
Low reference current - Give more flexibility to divide resistor select and reduce the output voltage error
Better deviation of reference voltage over full temperature range - Low output variation over temperature
High reference voltage accuracy - Guarantee the output accuracy

Application(s)

Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference

Specifications & Technical Documents

Product Parameters

Accuracy (%)	0.5, 1
MaximumInput Voltage (V)	40
Maximum Slope Resistance (Ω)	0.3
Minimum Cathode Current for Regulation Typ (µA)	50
Operating Ambient Temperature Range (°C)	-40 to 125
AEC Qualified	No
ReferenceVoltage (V)	2.5
Sink Current (mA)	100

Technical Documents

SPICE Model

AP431i.spice.txt

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-2514	2021-03-09	2021-06-09	Additional Wafer Source JKFAB
PCN-2492	2020-11-04	2021-05-04	Device End of Life (EOL)