temperature stability over the applicable extended
commercial temperature range. The output voltage
may be set at any level greater than 2.495V(V
REF
)
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.
The precise (+/-) 1% Reference voltage tolerance of
the AP431/431A 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.
•
•
•
•
•
•
•
•
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: 30 ppm/
o
C
Fast turn-on response
Low dynamic output impedance: 0.2Ω
Programmable output voltage to 36v
Low output noise.
Packages: TO92, SOT89, SOT23, SOT25 and
SOP-8L
Ordering Information
A P 4 3 1 X X X X X
Operating Temp. Range
Blank : -20
o
C~85
o
C
I : -40
o
C~85
o
C
Reference Voltage
Tolerance:
Blank : +/- 1%
A
: +/- 0.5%
Package
Lead Free
Packing
Blank : Normal
Blank : SOP-8L
Blank : Tube or bulk
Y
: SOT89-3L L : Lead Free Package A
: Taping
V
: TO92-3L
W
: SOT23-3L
R
: SOT23-3L
Q
: SOT25
Typical Application Circuit
V
IN
V
OUT
+
C
in
AP431
R1
+
C
out
R2
V
OUT
= (1+R1/R2)V
REF
Precision Regulator
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.2 Sep.28, 2005
1/17
AP431/AP431A
Adjustable Precision Shunt Regulator
Block Diagram
Symbol
Cathode (C)
REF (R)
+
Cathode (C)
-
V
REF
REF (R)
Anode (A)
Anode (A)
Pin Configuration
Order Number
AP431Y
AP431 AY
AP431IY
AP431IAY
(SOT89)
Pin Configuration (Top View)
3 Cathode
2 Anode
1 REF
Order Number
AP431R
AP431AR
AP431IR
AP431IAR
(SOT23)
Pin Configuration (Top View)
3 Cathode
Anode 1
2 REF
AP431
AP431A
AP431I
AP431IA
(SOP)
Cathode
Anode
Anode
NC
1
2
3
4
Anachip Corp.
www.anachip.com.tw
2/17
+
+
+
AP431V
AP431 AV
AP431IV
AP431IAV
(TO92)
3 Cathode
2 Anode
1 REF
AP431W
AP431AW
AP431IW
AP431IAW
(SOT23)
3 REF
Anode 1
2 Cathode
8
7
6
5
REF
Anode
Anode
NC
AP431 Q
AP431 AQ
AP431IQ
AP431IAQ
(SOT25)
NC
NC
Cathode
1
2
3
5
4
Anode
REF
Rev.1.2 Sep.28, 2005
AP431/AP431A
Adjustable Precision Shunt Regulator
Marking Information
(1) SOT23 / SOT25 / SOT89
P/N Type
AP431Y
AP431AY
AP431IY
AP431IAY
AP431W
AP431AW
AP431IW
AP431IAW
AP431R
AP431AR
AP431IR
AP431IAR
AP431Q
AP431AQ
AP431IQ
AP431IAQ
(2) SOP
XX
A4
A5
AA
AB
A6
A7
AC
AD
A8
A9
AE
AF
A2
A3
AG
AH
(Top View)
SOT23/SOT25
XX YM X
XX: P/N Type
Date code
Y : Year
M : Month(A~L)
X: Blank : normal
L : Lead Free Package
SOT89
XX
YMX
( Top view )
Logo
Date code
YY : Year
WW: Nth week
Temp. grade
AP431X X
YYWW X
Blank: -20
o
C ~ +85
o
C
I
: -40
o
C ~ +85
o
C
Lead Free
Blank: normal
L: Lead Free Package
Accuracy
Blank:
2 . 495
±
1 %
A
:
2 . 495
±
0 . 5 %
(3)TO92
( Top view )
Temp. grade
Accuracy
Blank:
2.495
±
1%
A
:
2.495
±
0.5%
Blank: -20
o
C ~ +85
o
C
I
: -40
o
C ~ +85
o
C
AP431X
X YWW X X
Date code
Y : Year
WW: Nth week
Internal code
Lead Free
Blank: normal
L: Lead Free Package
Anachip Corp.
www.anachip.com.tw
3/17
Rev.1.2 Sep.28, 2005
AP431/AP431A
Adjustable Precision Shunt Regulator
Absolute Maximum Ratings
Cathode Voltage ………………………………......…..............................……………………………...……….36V
Continuous Cathode Current ………………………….……...............................…………….... -10mA ~ 250mA
Reference Input Current Range ……………..………..............……..............................………….…....... 10mA
Operating Temperature Range (AP431)…………..…….…….....………………...........………......-20
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