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
regulators with guaranteed temperature stability over the applicable
extended commercial temperature range. The output voltage may be
set at any level greater than 2.495V (VREF) up to 36V merely by
selecting two external resistors that act as a voltage divider network.
These devices have a typical output impedance of 0.2Ω. Active output
circuitry provides very sharp turn-on characteristics, making these
devices excellent improved replacements for Zener diodes in many
applications.
(1) SOT25
(2) SO-8
(Top View)
NC
5
1
NC
(Top View)
ANODE
2
CATHODE
4
3
REF
CATHODE
1
8
REF
ANODE
2
7
ANODE
ANODE
3
6
ANODE
NC
4
5
NC
(3) SC59
(4) SC59R
(Top View)
The
precise
(+/-)
1%
reference
voltage
tolerance
of
AP431/AP431A make it possible in many applications to avoid the
use of a variable resistor, consequently saving cost and eliminating
drift and reliability problems associated with it.
CATHODE
1
REF
2
(5) SOT23
Precision Reference Voltage
AP431: 2.495V ± 1%
AP431A: 2.495V ± 0.5%
Sink Current Capability: 200mA
Minimum Cathode Current for Regulation: 300μA
Equivalent Full-Range Temp Coefficient: 30ppm/°C
Fast Turn-On Response
Low Dynamic Output Impedance: 0.2Ω
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:
Available in “Green” Molding Compound (No Br, Sb). See
“Ordering Information”
Halogen and Antimony Free. “Green” Device (Note 3)
1
CATHODE
2
3
(Top View)
REF 1
1
CATHODE
ANODE
(6) SOT23R
(Top View)
•
•
•
•
•
•
•
•
•
•
•
REF
3 ANODE
Features
Notes:
(Top View)
the
3 ANODE
3 ANODE
CATHODE 2
REF 2
(7) SOT89
(Top View)
1
2
3
REF Anode Cathode
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com 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
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