ZTL431AQ, ZTL431BQ
ZTL432AQ, ZTL432BQ
AUTOMOTIVE COMPLIANT ADJUSTABLE PRECISION SHUNT REGULATOR
Description
The ZTL431AQ, ZTL431BQ, ZTL432AQ, and ZTL432BQ are three
terminal adjustable shunt regulators that offer excellent temperature
stability and output current handling capability up to 100mA. The
output voltage can be set to any chosen voltage between 2.5V and
20V by the selection of two external divider resistors.
The ZTL432AQ, ZTL432BQ has the same electrical specifications as
the ZTL431AQ, ZTL431BQ but has a different pin out in SOT23
(F-suffix).
The ZTL431AQ, ZTL431BQ, ZTL432AQ, and ZTL432BQ are
available in two grades with initial tolerances of 1% and 0.5% for the
A and B grades respectively.
These devices are functionally equivalent to the TL431/TL432 except
for maximum operation voltage, and they have an ambient
temperature range of -40° to +125° as standard.
C
C
Pin Assignments
(Top View)
SOT23
(ZTL431AQ, ZTL431BQ)
(Top View)
SOT23
(ZTL432AQ, ZTL432BQ)
(Top View)
N/C
Features
Temperature Range: -40° to +125°
C
C
Reference Voltage Tolerance at +25°
C
0.5%: B Grade
1%: A Grade
0.2Ω Typical Output Impedance
Sink Current Capability: 1mA to 100mA
Adjustable Output Voltage: V
REF
to 20V
Green Molding in SOT23 and SOT25
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
The ZTL431AQ, ZTL431BQ, ZTL432AQ and ZTL432BQ are
suitable for automotive applications requiring specific
change control and are AEC-Q100 qualified, have a grade 1
temperature rating, are PPAP capable, and are manufactured
in IATF16949:2016 certified facilities.
1
5
Anode
N/C*
2
Cathode
3
4
Ref
*
must be left floating or
connected to pin 5
SOT25
(ZTL431AQ, ZTL431BQ)
Typical Application
Applications
Opto-Coupler Linearization
Linear Regulators
Improved Zener
Variable Reference
ZTL431AQ, ZTL431BQ,
ZTL432AQ, ZTL432BQ
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.
ZTL431AQ, ZTL431BQ, ZTL432AQ, ZTL432BQ
Document number: DS36916 Rev. 5 - 2
1 of 11
www.diodes.com
September 2019
© Diodes Incorporated
ZTL431AQ, ZTL431BQ
ZTL432AQ, ZTL432BQ
Absolute Maximum Ratings
(Voltages specified are relative to the Anode pin unless otherwise stated.)
Parameter
Cathode Voltage (V
KA
)
Continuous Cathode Current (I
KA
)
Reference Input Current Range (I
REF
)
Operating Junction Temperature
Storage Temperature
ESD Susceptibility
HBM
Human Body Model
MM
Machine Model
CDM
Charged Device Model
Caution:
Rating
20
150
-50µA to +10mA
-40 to +150
-55 to +150
2
200
1
Unit
V
mA
—
°
C
°
C
kV
V
kV
Stresses greater than the 'Absolute
Maximum Ratings'
specified above, can cause permanent damage to the device. These are stress ratings only;
functional operation of the device at conditions between maximum recommended operating conditions and absolute maximum ratings is not implied. Device
reliability can be affected by exposure to absolute maximum rating conditions for extended periods of time.
(Semiconductor devices are ESD sensitive and can be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and
transporting these devices.)
Package Thermal Data
Package
SOT23
SOT23F
SOT25
JA
380°
C/W
138°
C/W
250°
C/W
P
DIS
T
A
= +25° T
J
= +125°
C,
C
260mW
720mW
400mW
Recommended Operating Conditions
(@T
A
= +25° unless otherwise specified.)
C,
Symbol
V
KA
I
KA
T
A
Cathode Voltage
Cathode Current
Operating Ambient Temperature Range
Parameter
Min
V
REF
1
-40
Max
20
100
+125
Unit
V
mA
°
C
Electrical Characteristics
(@T
A
= +25° unless otherwise specified.)
C,
Symbol
V
REF
Parameter
Reference Voltage
Deviation of Reference Voltage Over Full
Temperature Range
Ratio of Change In Reference Voltage
To the Change In Cathode Voltage
Reference Input Current
I
REF
Deviation Over Full Temperature Range
Minimum Cathode Current for Regulation
Off State Current
Dynamic Output Impedance
V
KA
= V
REF
I
KA
= 10mA
V
KA
= V
REF
I
KA
= 10mA
I
KA
= 10mA
Conditions
A - grade
B - grade
T
A
= 0 to +70°
C
T
A
= -40 to +85°
C
T
A
= -40 to +125°
C
V
KA
= V
REF
to 10V
V
KA
= 10V to 20V
T
A
= 0 to +70°
C
T
A
= -40 to +85°
C
T
A
= -40 to +125°
C
—
—
—
Min
2.475
2.487
—
—
—
—
—
—
—
—
—
—
—
—
Typ
2.5
2.5
6
14
14
-1.4
-1.0
2
0.8
0.8
0.8
0.4
0.1
0.2
Max
2.525
2.513
16
34
34
-2.7
-2.0
4
1.2
2.5
2.5
0.6
0.5
0.5
mA
µA
Ω
µA
mV/V
µA
mV
Unit
V
V
DEV
V
REF
V
KA
I
REF
I
REF
I
KA(MIN)
I
KA(OFF)
R
Z
I
KA
= 10mA, R1 = 10kΩ, R
2
= open
I
KA
= 10mA
R
1
= 10kΩ
R
2
= open
V
KA
= V
REF
V
KA
= 20V, V
REF
= 0V
V
KA
= V
REF
, f = 0Hz
ZTL431AQ, ZTL431BQ, ZTL432AQ, ZTL432BQ
Document number: DS36916 Rev. 5 - 2
2 of 11
www.diodes.com
September 2019
© Diodes Incorporated
ZTL431AQ, ZTL431BQ
ZTL432AQ, ZTL432BQ
Reference Voltage vs. Temperature
Typical Characteristics
I
KA
= 10mA
V
REF
= V
KA
Reference Voltage vs. Temperature
Dynamic Impedance vs. Frequency
1000
V
REF
= V
KA
Power Dissipation (mW)
900
800
700
600
500
400
300
200
100
0
0
SOT23F
SOT23-5
SOT23
SC70-6
25
50
75
100
125
Ambient Temperature (°
C)
Power Dissipation Derating
Dynamic Impedance vs. Frequency
1000
Power Dissipation (mW)
900
800
700
600
500
400
300
200
100
0
0
SOT23F
SOT23-5
SOT23
SC70-6
25
50
75
100
125
Ambient Temperature (°
C)
Power Dissipation Derating
ZTL431AQ, ZTL431BQ, ZTL432AQ, ZTL432BQ
Document number: DS36916 Rev. 5 - 2
3 of 11
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September 2019
© Diodes Incorporated
ZTL431AQ, ZTL431BQ
ZTL432AQ, ZTL432BQ
Typical Characteristics
(continued)
V
KA
60
50
I
KA
Gain (dB)
40
30
20
10
0
100
1000
10000
100000
1000000
Frequency (Hz)
I
KA
Gain vs. Frequency
Test Circuit for Open Loop Voltage Gain
V
KA
V
KA
Pulse Response
Test Circuit for Pulse Response
V
KA
100
90
Cathode
Current
(mA)
80
70
60
50
40
I
KA
Stable
Stable
30
20
10
0
10.0E-12
100.0E-12
1.0E-9
10.0E-9
100.0E-9
1.0E-6
Load Capacitance (F)
Stability Boundary Condition
V
REF
V
KA
< 20V,
KA
= 10mA,
A
= +25°
C
V
REF
<
< V
KA
< 20,
I
I
KA
= 10mA, T
T
A
= 25°
C
Test Circuit for
Stabilty
Boundary Conditions
Stability
Boundary Conditions
Test Circuit for
ZTL431AQ, ZTL431BQ, ZTL432AQ, ZTL432BQ
Document number: DS36916 Rev. 5 - 2
4 of 11
www.diodes.com
September 2019
© Diodes Incorporated
ZTL431AQ, ZTL431BQ
ZTL432AQ, ZTL432BQ
Application Circuits
V+
V
OUT
V+
R1
V
REF
V
OUT
R1
V
REF
R2
R2
V
OUT
V
REF
V
OUT
V
REF
Shunt regulator
Higher current shunt
regulator
V+
ZSR***
V+
In
Out
Common
R1
V
OUT
30Ω
0.01µF
V
REF
R1
R2
V
OUT(MIN)
= V
REF
+ V
REG
V
OUT
V
REF
R2
V
OUT
V
REF
V
OUT
V
REF
Output control of a three
terminal fixed regulator
Series regulator
V+
V+
R1B
R1
R1A
R1
V
REF
Output
Output
Input
V
REF
V
TH
= 2.5V
V
ON
~
2V
V
OFF
= V
+
R2a
R2A
R2B
R2b
V
REF
V
REF
Single supply comparator
with temperature
compensated threshold
Over voltage / under voltage
protection circuit
ZTL431AQ, ZTL431BQ, ZTL432AQ, ZTL432BQ
Document number: DS36916 Rev. 5 - 2
5 of 11
www.diodes.com
September 2019
© Diodes Incorporated
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