AP431S
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
Description
The AP431S 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 impedance, which makes it ideal substitute for Zener diode in
applications such as switching power supply, charger and other
adjustable regulators.
The AP431S 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.
The output voltage of AP431S can be set to any value between V
REF
(2.5V/2.495V) and the corresponding maximum cathode voltage
(36V).
The AP431S is offered in two grade initial voltage tolerance at +25°
C,
0.5% and 1%.
This IC is available in 3 packages: TO92 (ammo packing), SOT23
and SOT89.
Pin Assignments
(Top View)
ANODE
3
(Top View)
ANODE
3
NEW PRODUCT
1
REF
2
CATHODE
1
CATHODE
2
REF
SOT23 (Package Code: N)
(Top View)
SOT23 (Package Code: N1)
(Top View)
1
2
3
1
2
3
REF ANODE CATHODE
Features
Low Minimum Cathode Current for Regulation: 50μA (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° to +125°
C
C)
Sink Current Capacity from 100µA to 100mA
Low Dynamic Impedance: 0.1Ω (Typ.)
Wide Operating Temperature Range: -40C to +125°
C
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
SOT89 (Option 1)
(Top View)
REF ANODE CATHODE
SOT89 (Option 2)
TO92 (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.
AP431S
Document number: DS39195 Rev. 1 - 2
1 of 17
www.diodes.com
January 2017
© Diodes Incorporated
AP431S
Functional Block Diagram
CATHODE
REF
+
NEW PRODUCT
-
V
REF
ANODE
Absolute Maximum Ratings
(Note 4)
Symbol
V
KA
I
KA
I
REF
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
TO92
P
D
Power Dissipation
SOT89
SOT23
T
J
T
STG
ESD
ESD
Note 4:
Parameter
Rating
40
-100 to 150
10
750
750
350
+150
-65 to +150
5,500
300
Unit
V
mA
mA
mW
Junction Temperature
Storage Temperature Range
ESD (Human Body Model)
ESD (Machine Model)
°
C
°
C
V
V
Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Symbol
V
KA
I
KA
T
A
Cathode Voltage
Cathode Current
Operating Ambient Temperature Range
Parameter
Min
V
REF
0.1
-40
Max
36
100
+125
Unit
V
mA
°
C
AP431S
Document number: DS39195 Rev. 1 - 2
4 of 17
www.diodes.com
January 2017
© Diodes Incorporated
DIY/Open Source Hardware
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