AZ431-A
Document number: DS36721 Rev. 6 - 2
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AZ431-A
ADJUSTABLE PRECISION SHUNT REGULATORS
Description
The AZ431-A is a three-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 make it ideal substitute for Zener diode in
applications such as switching power supply, charger and other
adjustable regulators.
The output voltage of AZ431-A can be set to any value between VREF
(2.5V) and the corresponding maximum cathode voltage (36V).
The AZ431-A precision reference is offered in two voltage tolerance:
0.4% and 0.8%.
This IC is available in 3 packages: TO92 (Bulk or Ammo Packing),
SOT23 and SOT89.
Features
Programmable Precise Output Voltage from 2.5V to 36V
High Stability under Capacitive Load
Low Temperature Deviation: 4.5mV Typical
Low Equivalent Full-range Temperature Coefficient with
20PPM/°C Typical
Sink Current Capacity from 1mA to 100mA
Low Output Noise
Wide Operating Range of -40 to +125°C
Lead-Free Packages: TO92, SOT23, SOT89
Totally Lead-Free; RoHS Compliant (Notes 1 & 2)
Lead-Free Packages, Available in “Green” Molding Compound:
TO92, SOT23
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
Pin Assignments
(Top View)
SOT23
(Top View) (Top View)
SOT89 (Option 1) SOT89 (Option 2)
(Top View) (Top View)
TO92 (Bulk Packing) TO92 (Ammo Packing)
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ 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.
3
2
1
ANODE
REF CATHODE
123
REF ANODE CATHODE
123
REF ANODE CATHODE
1
2
3
ANODE
REF
CATHODE
1
2
3CATHODE
ANODE
REF
AZ431-A
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AZ431-A
Absolute Maximum Ratings (Note 4)
Symbol
Parameter
Rating
Unit
VKA
Cathode Voltage
40
V
IKA
Cathode Current Range (Continuous)
-100 to 150
mA
IREF
Reference Input Current Range
10
mA
PD
Power Dissipation
Z, R Package: 770
mW
N Package: 370
θJA
Thermal Resistance
(Junction to Ambient)
SOT23
380
°C/W
TO92
165
SOT89
165
TJ
Junction Temperature
+150
°C
TSTG
Storage Temperature Range
-65 to +150
°C
ESD
ESD (Human Body Model)
2000
V
Note 4: 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
Parameter
Min
Max
Unit
VKA
Cathode Voltage
VREF
36
V
IKA
Cathode Current
1.0
100
mA
TA
Operating Ambient Temperature Range
-40
+125
°C
AZ431-A
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AZ431-A
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol
Test
Circuit
Parameter
Conditions
Min
Typ
Max
Unit
VREF
4
Reference Voltage
0.4%
VKA = VREF, IKA = 10mA
2.490
2.500
2.510
V
0.8%
2.480
2.500
2.520
VREF
4
Deviation of Reference Voltage
Over Full Temperature Range
VKA = VREF
IKA = 10mA
0 to +70°C
—
4.5
8
mV
-40 to +85°C
—
4.5
10
-40 to +125°C
—
4.5
16
VREF
VKA
5
Ratio of Change in Reference
Voltage to the Change in
Cathode Voltage
IKA = 10mA
VKA =
10V to VREF
—
-1.0
-2.7
mV/V
VKA =
36V to 10V
—
-0.5
-2.0
IREF
5
Reference Current
IKA = 10mA, R1 = 10kΩ, R2 =
∞
—
0.7
4
µA
IREF
5
Deviation of Reference Current
Over Full Temperature Range
IKA = 10mA, R1 = 10kΩ
R2 = ∞, TA = -40 to +125°C
—
0.4
1.2
µA
IKA
(Min)
4
Minimum Cathode Current for
Regulation
VKA = VREF
—
0.4
1.0
mA
IKA
(Off)
6
Off-state Cathode Current
VKA = 36V, VREF = 0
—
0.05
1.0
µA
ZKA
4
Dynamic Impedance
VKA = VREF, IKA = 1 to 100mA,
f ≤ 1.0kHz
—
0.15
0.5
Ω
θJC
—
Thermal Resistance
SOT23
—
135.48
—
°C/W
—
TO92
—
81.63
—
—
SOT89
—
29.80
—
AZ431-A
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AZ431-A
Performance Characteristics
Reference Voltage vs. Ambient Temperature Reference Current vs. Ambient Temperature
Cathode Current vs. Cathode Voltage Cathode Current vs. Cathode Voltage
Off-State Cathode Current vs. Ambient Temperature Ratio of Delta Reference Voltage to the
Ratio of Delta Cathode Voltage
-60 -40 -20 0 20 40 60 80 100 120 140
2.485
2.490
2.495
2.500
2.505
2.510
Reference Voltage (V)
Ambient Temperature (oC)
VKA = VREF
IKA = 10mA
-60 -40 -20 0 20 40 60 80 100 120 140
0.0
0.5
1.0
1.5
R1=10K,R2=Infinite
IKA=10mA
Reference Current (A)
Ambient Temperature (0C)
-2 -1 0 1 2 3
-100
-50
0
50
100
150
Cathode Current (mA)
Cathode Voltage (V)
VKA=VREF
TA=250C
-1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5
-200
0
200
400
600
800
Cathode Current (A)
Cathode Voltage (V)
VKA=VREF
TA=250C
-40 -20 0 20 40 60 80 100 120
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Off-State Cathode Current (A)
Ambient Temperature (oC)
VKA=36V
VREF=0
-40 -20 0 20 40 60 80 100 120
-1.4
-1.3
-1.2
-1.1
-1.0
-0.9 VKA=3.5V to 36V
VREF / VKA (mV/V)
Ambient Temperature (oC)
AZ431-A
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AZ431-A
Performance Characteristics (Cont.)
Small Signal Voltage Gain vs. Frequency
Reference Impedance vs. Frequency
Stability Boundary Conditions vs. Load Capacitance
1k 10k 100k 1M
-10
0
10
20
30
40
50
60
70
Voltage Gain (dB)
Small Signal Frequency (Hz)
TA=250C
IKA=10mA
1K 10K 100K 1,000K
0.1
1
10
Reference Impedance ()
Frequency (Hz)
IKA=10mA
TA=25oC
1E-3 0.01 0.1 1 10 100
0
10
20
30
40
50
60
70
80
90
100
VKA=VREF
VKA= 5V
VKA=10V
VKA=15V: No Oscillation
Stable Stable
Cathode Current (mA)
Load Capacitance (F)
AZ431-A
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AZ431-A
Ordering Information
AZ431 X X - X XX XX
Packing
Package TR : Tape & Reel
N : SOT23 E1/G1
Blank : Bulk
E1 : RoHS Compliant
G1 : RoHS Compliant
and Green
R : SOT89
Z : TO92
Voltage Tolerance
A: 40V
Cathode Voltage
A : 0.4%
B : 0.8% or Ammo
Notes: 5. All variants with SOT25 package are End of Life without alternatives.
NRND: Not Recommended for New Design.
6. For packaging details, go to our website at: https://www.diodes.com/design/support/packaging/diodes-packaging/.
Part Number
Voltage
Tolerance
Package
(Note 6)
RoHS
Compliant
Lead Free /
Green
Marking ID
Packing
Quantity
Status
(Note 5)
Alternative
AZ431AN-ATRE1
0.4%
SOT23
Lead Free
EA1
Tape & Reel
3000
NRND
AZ431AN-
ATRG1
AZ431BN-ATRE1
0.8%
Lead Free
EA2
Tape & Reel
3000
NRND
AZ431BN-
ATRG1
AZ431AN-ATRG1
0.4%
Green
GA1
Tape & Reel
3000
In Production
—
AZ431BN-ATRG1
0.8%
Green
GA2
Tape & Reel
3000
In Production
—
AZ431AK-ATRE1
0.4%
SOT25
Lead Free
E3A
Tape & Reel
3000
End of Life
None
AZ431BK-ATRE1
0.8%
Lead Free
E3B
Tape & Reel
3000
End of Life
None
AZ431AK-ATRG1
0.4%
Green
G3A
Tape & Reel
3000
End of Life
None
AZ431BK-ATRG1
0.8%
Green
G3B
Tape & Reel
3000
End of Life
None
AZ431AZ-AE1
0.4%
TO92
Lead Free
AZ431AZ-AE1
Bulk
1000
In Production
—
AZ431AZ-ATRE1
0.4%
Lead Free
AZ431AZ-AE1
Ammo
2000
In Production
—
AZ431BZ-AE1
0.8%
Lead Free
AZ431BZ-AE1
Bulk
1000
In Production
—
AZ431BZ-ATRE1
0.8%
Lead Free
AZ431BZ-AE1
Ammo
2000
In Production
—
AZ431AZ-AG1
0.4%
Green
AZ431AZ-AG1
Bulk
1000
End of Life
AZ431AZ-
ATRG1
AZ431AZ-ATRG1
0.4%
Green
AZ431AZ-AG1
Ammo
2000
In Production
—
AZ431BZ-AG1
0.8%
Green
AZ431BZ-AG1
Bulk
1000
End of Life
AZ431BZ-
ATRG1
AZ431BZ-ATRG1
0.8%
Green
AZ431BZ-AG1
Ammo
2000
In Production
—
AZ431AR-ATRE1
0.4%
SOT89
Lead Free
E43A
Tape & Reel
1000
NRND
None
AZ431BR-ATRE1
0.8%
Lead Free
E43B
Tape & Reel
1000
NRND
None
AZ431AR-ATRG1
0.4%
Green
G43A
Tape & Reel
1000
End of Life
None
AZ431BR-ATRG1
0.8%
Green
G43B
Tape & Reel
1000
End of Life
None
Pb
Lead-Free
Pb
Lead-Free
Pb
Lead-Free
Pb
Lead-Free
AZ431-A
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AZ431-A
3
Marking Information
(1) TO92 (Bulk Packing)
(Top View)
(2) TO92 (Ammo Packing)
(Top View)
(3) SOT23
(Top View)
XXXXX
XZ-XX1
YWWAXX
XXX
: Logo
XXX: Marking ID
(See Ordering Information)
First and Second Lines: Logo and Marking ID
(See Ordering Information)
Third Line: Date Code
Y: Year
WW: Work Week of Molding
A: Assembly House Code
XX: 7th and 8th Digits of Batch Number
XXXXX
XZ-XX1
YWWAXX
First and Second Lines: Logo and Marking ID
(See Ordering Information)
Third Line: Date Code
Y: Year
WW: Work Week of Molding
A: Assembly House Code
XX: 7th and 8th Digits of Batch Number
AZ431-A
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AZ431-A
Package Outline Dimensions (All dimensions in mm.)
(1) Package Type: TO92 (Bulk Packing)
2.420(0.095)
2.660(0.105)
0.360(0.014)
0.760(0.030)
Φ
1.600(0.063)
MAX
12.500(0.492)
15.500(0.610)
1.270(0.050)
TYP
3.300(0.130)
3.700(0.146)
4.300(0.169)
4.700(0.185)
1.000(0.039)
1.400(0.055)
4.400(0.173)
4.800(0.189)
3.430(0.135)
MIN
0.320(0.013)
0.510(0.020)
0.000(0.000)
0.380(0.015)
AZ431-A
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AZ431-A
Package Outline Dimensions (Cont. All dimensions in mm.)
(2) Package Type: TO92 (Ammo Packing)
4.300(0.169)
4.700(0.185)
12.500(0.492)
14.500(0.571)
2.540(0.100)
Typ
1.270(0.050)
Typ
0. (0.015)
0.550(0.022)
4.400(0.173)
4.800(0.189)
3.430(0.135)
MIN
0.320(0.013)
0.510(0.020)
0.000(0.000)
0.380(0.015)
MAX
1.100(0.043
1.400(0.055)
3.300(0.130)
3.800(0.150)
Φ
1.600(0.063)
)
380
2.500(0.098)
4.000(0.157)
13.000(0.512)
15.000(0.591)
AZ431-A
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AZ431-A
Package Outline Dimensions (Cont. All dimensions in mm.)
(3) Package Type: SOT23
2.300(0.091)
2.500(0.098) 1.200(0.047)
1.400(0.055)
0.890(0.035)
1.030(0.041)
0.300(0.012)
0.510(0.020)
1.900(0.075)REF
2.800(0.110)
3.000(0.118)
2.0°
3.0°
0.500(0.020)
0.700(0.028)
1.050(0.041)REF 0.010(0.0004)
0.100(0.004)
0.900(0.035)
1.100(0.043)
4×R0.100(0.004) 7.0°
7.0°
0.550(0.022)REF
0.200(0.008)MIN
0.100(0.004) GAUGE PLANE
0.080(0.003)
0.180(0.007)
R0.100(0.004)
0.0°
~10.0°
AZ431-A
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AZ431-A
Package Outline Dimensions (Cont. All dimensions in mm.)
(4) Package Type: SOT89
45
1.550(0.061)REF
4.400(0.173)
4.600(0.181)
0.900(0.035)
1.200(0.047)
3.950(0.156)
4.250(0.167)
3.000(0.118)
TYP
0.480(0.019)
2.300(0.091)
2.600(0.102)
0.320(0.013)
0.540(0.021)
310
2.060(0.081)REF
1.400(0.055)
1.600(0.063)
0.350(0.014)
0.450(0.018)
R0.150(0.006)
3
10
1.500(0.059)
0.320(0.013)REF
1.620(0.064)REF
2.210(0.087)REF
0.320(0.013)
0.540(0.021)
1.800(0.071)
Option 1 Option 2
0.620(0.024)
1.030(0.041)REF R 0.200(0.008)
1.620(0.064)
1.830(0.072)
2.630(0.104)
2.930(0.115)
Option 1
AZ431-A
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AZ431-A
Suggested Pad Layout
(1) Package Type: SOT23
Y
G
Z
Y
X E
Grid placement courtyard
Dimensions
Z
(mm)/(inch)
G
(mm)/(inch)
X
(mm)/(inch)
Y
(mm)/(inch)
E
(mm)/(inch)
Value
2.900/0.114
1.100/0.043
0.800/0.031
0.900/0.035
0.950/0.037
AZ431-A
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AZ431-A
Suggested Pad Layout (Cont.)
(2) Package Type: SOT89
X1
X2 Y1
E
X
Y
Z
Dimensions
Z
(mm)/(inch)
X
(mm)/(inch)
X1
(mm)/(inch)
X2
(mm)/(inch)
Y
(mm)/(inch)
Y1
(mm)/(inch)
E
(mm)/(inch)
Value
4.600/0.181
0.550/0.022
1.850/0.073
0.800/0.031
1.300/0.051
1.475/0.058
1.500/0.059
AZ431-A
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AZ431-A
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
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