Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
General Description
The AS431I is a three-terminal adjustable shunt reg-
ulator with guaranteed thermal stability over a full
operation range. It features sharp turn-on characteris-
tics, low temperature coefficient and low output
impedance, which make it ideal substitute for Zener
diode in applications such as switching power supply,
charger and other adjustable regulators.
The output voltage of AS431I can be set to any value
between V
REF
(2.5V) and the corresponding
maximum cathode voltage (36V).
The AS431I is offered in two grade initial voltage
tolerance at 25℃, 0.5%, and 1%.
This IC is available in 3 packages: TO-92 (bulk or
ammo packing), SOT-23 and SOT-89.
Features
Programmable Precise Output Voltage from
2.5V to 36V
High Stability Under Capacitive Load
Low Minimum Cathode Current for Regulation:
10µA (Typ.), 50µA (Max.)
Low Temperature Deviation: 4.5mV Typical
Sink Current Capacity from 50µ A to 100mA
Low Output Noise
Wide Operating Range: -40℃ to 125℃
Applications
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
TO-92(Bulk Packing)
TO-92(Ammo Packing)
SOT-89
SOT-23
Figure 1. Package Type of AS431I
Aug. 2011 Rev. 1. 6
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Pin Configuration
N Package
(SOT-23)
P Package
(SOT-89)
Z Package
(TO-92 (Bulk Package))
Z Package
(TO-92 (Ammo Package))
Figure 2. Pin Configuration of AS431I (Top View)
Aug. 2011 Rev. 1. 6
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Functional Block Diagram
CATHODE
REF
+
-
V
REF
ANODE
Figure 3. Functional Block Diagram of AS431I
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Ordering Information
AS431I
-
Circuit Type
Voltage Tolerance
A: 0.5%
B: 1.0%
Package
N: SOT-23
R: SOT-89
Z: TO-92
Temperature
Range
-40 to 125℃
1.0%
0.5%
0.5%
TO-92
-40 to 125℃
1.0%
1.0%
0.5%
SOT-89
-40 to 125℃
1.0%
AS431IBRTR-G1
AS431IBZ-G1
AS431IBZTR-G1
AS431IARTR-G1
AS431IBNTR-G1
AS431IAZ-G1
AS431IAZTR-G1
Voltage
Tolerance
0.5%
SOT-23
G1: Green
TR: Tape and Reel or Ammo
Blank: Bulk
Package
Part Number
AS431IANTR-G1
Marking ID
GB9
GC9
AS431IAZ-G1
AS431IAZ-G1
AS431IBZ-G1
AS431IBZ-G1
G43J
G43K
Packing Type
Tape & Reel
Tape & Reel
Bulk
Ammo
Bulk
Ammo
Tape & Reel
Tape & Reel
BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and
Green.
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Absolute Maximum Ratings (Note 1)
Parameter
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Symbol
V
KA
I
KA
I
REF
Value
40
-100 to 150
10
TO-92
770
770
370
150
-65 to 150
2000
Unit
V
mA
mA
Power Dissipation
P
D
SOT-89
SOT-23
mW
Junction Temperature
Storage Temperature Range
ESD (Human Body Model)
T
J
T
STG
ESD
°C
°C
V
Note 1: 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
Parameter
Cathode Voltage
Cathode Current
Operating Ambient Temperature Range
Symbol
V
KA
I
KA
T
A
Min
V
REF
0.05
-40
Max
36
100
125
Unit
V
mA
°C
Aug. 2011 Rev. 1. 6
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BCD Semiconductor Manufacturing Limited
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