Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
General Description
The AZ431-B is a three-terminal adjustable shunt regu-
lator with guaranteed thermal stability over a full oper-
ation range. It features sharp turn-on characteristics,
low temperature coefficient and low output impedance,
which make it ideal substitute for Zener diode in appli-
cations such as switching power supply, charger and
other adjustable regulators.
The output voltage of AZ431-B can be set to any value
between V
REF
(2.5V) and the corresponding maximum
cathode voltage.
The AZ431-B precision reference is offered in two
voltage tolerance: 0.4% and 0.8%.
This IC is available in 5 packages: TO-92 (bulk or
ammo packing), SOT-23, SOT-23-5, SOT-89-3 and
SOIC-8.
AZ431-B
Features
·
·
·
·
·
·
·
Programmable Precise Output Voltage from 2.5V
to 18V
High Stability under Capacitive Load
Low Temperature Deviation: 4.5mV Typical
Low Equivalent Full-range Temperature Coeffi-
cient with 20PPM/
o
C Typical
Sink Current Capacity from 1mA to 100mA
Low Output Noise
Wide Operating Range of -40 to 125
o
C
Applications
·
·
·
·
·
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
SOIC-8
SOT-89-3
TO-92
SOT-23
SOT-23-5
TO-92 Ammo Packing
Figure 1. Package Types of AZ431-B
Mar. 2007 Rev. 2. 4
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BCD Semiconductor Manufacturing Limited
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Pin Configuration
M Package
(SOIC-8)
N Package
(SOT-23)
ANODE
AZ431-B
R Package
(SOT-89-3)
CATHODE
ANODE
ANODE
NC
1
2
3
4
8
7
6
5
REF
3
ANODE
ANODE
NC
REF
CATHODE
REF
ANODE CATHODE
1
2
1
2
3
Z Package
(TO-92)
Z Package
(TO-92 Ammo Packing)
K Package
(SOT-23-5)
3
2
1
CATHODE
ANODE
REF
3
2
1
CATHODE
ANODE
REF
NC
NC
CATHODE
1
2
3
5
ANODE
4
REF
Figure 2. Pin Configuration of AZ431-B (Top View)
Functional Block Diagram
CATHODE
REF
+
-
V
REF
ANODE
Figure 3. Functional Block Diagram of AZ431-B
Mar. 2007 Rev. 2. 4
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BCD Semiconductor Manufacturing Limited
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Ordering Information
AZ431-B
AZ431
Circuit Type
Voltage Tolerance
A: 0.4%
B: 0.8%
Package
-
E1: Lead Free
Blank: Tin Lead
TR: Tape and Reel or Ammo
Blank: Tube or Bulk
B: AZ431-B (20V)
M: SOIC-8
Z: TO-92
N: SOT-23
K: SOT-23-5
R: SOT-89-3
Package
Tempera-
ture Range
-40 to 125
o
C
-40 to 125
o
C
Voltage
Tolerance
0.4%
0.8%
0.4%
0.8%
0.4%
Part Number
Tin Lead
Lead Free
AZ431AN-BTRE1
AZ431BN-BTRE1
AZ431AK-BTR
AZ431BK-BTR
AZ431AZ-B
AZ431AZ-BTR
AZ431BZ-B
AZ431BZ-BTR
AZ431AM-B
AZ431AM-BTR
AZ431BM-B
AZ431BM-BTR
AZ431AR-BTR
AZ431BR-BTR
AZ431AK-BTRE1
AZ431BK-BTRE1
AZ431AZ-BE1
AZ431AZ-BTRE1
AZ431BZ-BE1
AZ431BZ-BTRE1
AZ431AM-BE1
AZ431AM-BTRE1
AZ431BM-BE1
AZ431BM-BTRE1
AZ431AR-BTRE1
AZ431BR-BTRE1
K4A
K4B
Marking ID
Tin Lead
Lead Free
EA4
EA5
E4A
E4B
AZ431AZ-BE1
AZ431AZ-BE1
AZ431BZ-BE1
AZ431BZ-BE1
AZ431AM-BE1
AZ431AM-BE1
AZ431BM-BE1
AZ431BM-BE1
E43C
E43D
Packing
Type
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Bulk
Ammo
Bulk
Ammo
Tube
Tape & Reel
Tube
Tape & Reel
Tape & Reel
Tape & Reel
SOT-23
SOT-23-5
AZ431AZ-B
AZ431AZ-B
AZ431BZ-B
AZ431BZ-B
AZ431AM-B
AZ431AM-B
AZ431BM-B
AZ431BM-B
431C
431D
TO-92
-40 to 125
o
C
0.4%
0.8%
0.8%
0.4%
SOIC-8
-40 to 125
o
C
0.4%
0.8%
0.8%
SOT-89-3
-40 to 125
o
C
0.4%
0.8%
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Mar. 2007 Rev. 2. 4
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BCD Semiconductor Manufacturing Limited
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Absolute Maximum Ratings (Note 1)
Parameter
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Symbol
V
KA
I
KA
I
REF
P
D
N, K Package: 370
Junction Temperature
Storage Temperature Range
ESD (Human Body Model)
T
J
T
STG
ESD
150
-65 to 150
2000
o
C
o
AZ431-B
Value
20
-100 to 150
10
M, Z, R Package: 770
Unit
V
mA
mA
Power Dissipation
mW
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
1.0
-40
Max
18
100
125
Unit
V
mA
o
C
Mar. 2007 Rev. 2. 4
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BCD Semiconductor Manufacturing Limited
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Electrical Characteristics
Operating Conditions: T
A
=25
o
C, unless otherwise specified.
Parameter
Reference Voltage
0.4%
0.8%
Test
Circuit
4
Symbol
V
REF
Conditions
V
KA
=V
REF,
I
KA
=10mA
0 to 70
o
C
Deviation of Reference Voltage
Over Full Temperature Range
4
∆V
REF
V
KA
=V
REF
I
KA
= 10mA
-40 to 85
o
C
-40 to 125
o
C
Ratio of Change in Reference
Voltage to the Change in
Cathode Voltage
Reference Current
Deviation of Reference Current
Over Full Temperature Range
Minimum Cathode Current for
Regulation
Off-state Cathode Current
∆V
REF
∆V
KA
I
REF
∆I
REF
I
KA
(Min)
I
KA
(Off)
Z
KA
∆V
KA
=
10V to V
REF
∆V
KA
=
18V to 10V
Min
2.490
2.480
Typ
2.500
2.500
4.5
4.5
4.5
-1.0
-0.5
0.7
0.4
0.4
Max
2.510
2.520
8
10
16
-2.7
mV/
V
-2.0
4
1.2
1.0
µA
µA
mA
µA
Ω
mV
Unit
V
AZ431-B
5
I
KA
=10mA
5
5
4
I
KA
=10mA, R1=10KΩ, R2=∞
I
KA
=10mA, R1=10KΩ, R2=∞
T
A
=-40 to 125
o
C
V
KA
=V
REF
V
KA
=18V, V
REF
=0
V
KA
=V
REF
, I
KA
=1 to 100mA
f
≤
1.0KHz
6
0.05
1.0
Dynamic Impedance
4
0.2
0.5
Mar. 2007 Rev. 2. 4
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BCD Semiconductor Manufacturing Limited
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