NOT RECOMMENDED FOR NEW DESIGN
USE AS431
AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
Description Pin Assignments
The AP431 and AP431A are 3-terminal adjustable precision shunt (1) SOT25 (2) SO-8
(Top View)
regulators with guaranteed temperature stability over the applicable (Top View)
extended commercial temperature range. The output voltage may be
1 8
CATHODE REF
NC 5 ANODE
1
set at any level greater than 2.495V (V ) up to 36V merely by
REF
ANODE 2 7 ANODE
selecting two external resistors that act as a voltage divider network.
NC
2
3 6 ANODE
ANODE
These devices have a typical output impedance of 0.2. Active output
4 5
NC NC
CATHODE 3 4 REF
circuitry provides very sharp turn-on characteristics, making these
devices excellent improved replacements for Zener diodes in many
applications.
(3) SC59 (4) SC59R
(Top View)
(Top View)
The precise (+/-) 1% reference voltage tolerance of the
1
CATHODE 1 REF
AP431/AP431A make it possible in many applications to avoid the
3 ANODE
3 ANODE
use of a variable resistor, consequently saving cost and eliminating
CATHODE 2
REF 2
drift and reliability problems associated with it.
(5) SOT23 (6) SOT23R
Features
(Top View) (Top View)
Precision Reference Voltage
REF 1
CATHODE 1
AP431: 2.495V 1%
AP431A: 2.495V 0.5%
3 ANODE
3 ANODE
Sink Current Capability: 200mA
Minimum Cathode Current for Regulation: 300A
CATHODE 2
REF 2
Equivalent Full-Range Temp Coefficient: 30ppm/C
Fast Turn-On Response
Low Dynamic Output Impedance: 0.2
(7) SOT89
(Top View)
Programmable Output Voltage to 36V
Low Output Noise
Lead Free Packages: SOT25, SC59, SC59R, SOT89 and SO-8
Totally Lead-Free; RoHS Compliant (Notes 1 & 2)
SOT23, SOT23R, SOT25, SC59, SC59R, SO-8, SOT89:
3
1 2
Available in Green Molding Compound (No Br, Sb). See
Anode Cathode
Ordering Information REF
Halogen and Antimony Free. Green Device (Note 3)
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See
NOT RECOMMENDED FOR NEW DESIGN
USE AS431
AP431/AP431A
Typical Applications Circuit
V
V
IN
OUT
+
+
R1
C
IN C
OUT
AP431
R2
V = (1 + R1/ R2) V
OUT REF
Precision Regulator
Symbol
Cathode (C)
REF (R)
Anode (A)
Functional Block Diagram
REF (R)
+
-
V
REF
Anode (A)
2 of 17
September 2014
AP431/AP431A
Diodes Incorporated
www.diodes.com
Document number: DS31002 Rev. 21 - 2
Cathode (C)