AP431i

Document number: DS37535 Rev. 6 - 2

1 of 17

www.diodes.com

October 2016

© Diodes Incorporated

AP431i

1

2

3

REF

ANODE

CATHODE

LOW CATHODE CUREENT ADJUSTABLE PRECISION SHUNT REGULATOR

Description

The AP431i is a 3-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 imped-

ance, which makes it ideal substitute for Zener diode in applications

such as switching power supply, charger and other adjustable

regulators.

The 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.

(2.5V/2.495V) and the corresponding maximum cathode voltage

(36V).

The AP431i is offered in two grade initial voltage tolerance at +25°C,

0.5% and 1%.

This IC is available in 3 packages: TO-92 (ammo packing), SOT-23

and SOT-89.

Features



Low Minimum Cathode Current for Regulation: 50

μA (Typ.),

100μA (Max.)



Programmable Precise Output Voltage from 2.5V/2.495V to 36V



High Stability Under Capacitive Load



Low Deviation of Reference Voltage Over Full Temperature

Range: 11mV Typical (-40

C to +125°C)



Sink Current Capacity from 100µA to 100mA



Low Dynamic Impedance: 0.1

Ω (Typ.)



Wide Operating Temperature Range: -40°C to +125°C



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



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

Pin Assignments

(Top View)

(Top View)

SOT-23 (Package Code: N)

SOT-23 (Package Code: N1)

(Top View)

(Top View)

SOT-89 (Option 1)

SOT-89 (Option 2)

(Top View)

TO-92 (Ammo Packing)

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.

1

2

3

REF ANODE CATHODE

1

2

3

REF ANODE CATHODE

1

2

3

REF

ANODE

CATHODE