AS431I

Document number: DS36816 Rev. 3 - 2

1 of 17

www.diodes.com

July 2014

© Diodes Incorporated

AS431I

A Product Line of

Diodes Incorporated

LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR

Description

The AS431I 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.

(2.5V) and the corresponding maximum cathode voltage (36V).

The AS431I is offered in two grade initial voltage tolerance at +25

0.5%, and 1%.

This IC is available in 3 packages: TO-92 (bulk or ammo packing),

SOT-23 and SOT-89.

Features



Programmable Precise Output Voltage from 2.5V to 36V



High Stability Under Capacitive Load



Low Minimum Cathode Current for Regulation: 10µA (Typ.), 50µA

(Max.)



Low Temperature Deviation: 4.5mV Typical



Sink Current Capacity from 50µA to 100mA



Low Output Noise



Wide Operating Range: -40 to +125



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)

Applications



Charger



Voltage Adapter



Switching Power Supply



Graphic Card



Precision Voltage Reference

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html

for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

Pin Assignments

(Top View)

(Top View)

(Top View)

SOT-23

SOT-89 (Option 1)

SOT-89 (Option 2)

1

2

3

REF ANODE CATHODE

CATHODE

ANODE

REF

3

2

1

1

2

3

REF ANODE CATHODE