ZTL431/ZTL432
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ZTL431/ZTL432
COST EFFECTIVE ADJUSTABLE PRECISION SHUNT REGULATOR
Description
The ZTL431 and ZTL432 are three terminal adjustable shunt
regulators offering excellent temperature stability and output current
handling capability up to 100mA. The output voltage may be set to
any chosen voltage between 2.5 and 20 volts by selection of two
external divider resistors.
The devices can be used as a replacement for zener diodes in many
applications requiring an improvement in zener performance.
The ZTL432 has the same electrical specifications as the ZTL431 but
has a different pin out in SOT23 (F-suffix) and SOT23F (FF-suffix).
Both variants are available in 2 grades with initial tolerances of 1%
and 0.5% for the A and B grades respectively.
These are functionally equivalent to the TL431/ TL432 except for
maximum operation voltage, and have an ambient temperature range
of -40°C to +125°C as standard.
Pin Assignments
ZTL431_F SOT23, ZTL431_FF SOT23F
(Top View)
ZTL432_F SOT23, ZTL432_FF SOT23F
(Top View)
ZTL431_H6, SOT363
(Top View)
†Connected internally to substrate;
should be left floating or connected to Anode
ZTL431ASE5 SOT25
(Top View)
ZTL431_E5 SOT25
(Top View)
*must be left floating or
connected to pin 5
Features
Temperature Range ................ -40°C to +125°C
Reference Voltage Tolerance at +25°C
0.5%.......................................B grade
1% .........................................A grade
0.2 typical output impedance
Sink Current Capability…….. 1mA to 100mA
Adjustable Output Voltage……VREF to 20V
Qualified to AEC-Q100 Standards for High Reliability
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Opto-Coupler Linearization
Linear Regulators
Improved Zener
Variable 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.
Anode
Cathode
Ref
2
1
3
Anode
Cathode
Ref
2
1
3
Anode
Cathode
Ref
2
1
3
Cathode
Ref
N/C
N/C
NC
Anode
3
2
1
4
5
6
Cathode
2
Anode
Cathode
N/C
3
15
4
Ref
N/C
2
Anode
Cathode
N/C
3
15
4
Ref
N/C*
ZTL431/ZTL432
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Absolute Maximum Ratings (Voltages specified are relative to the ANODE pin unless otherwise stated.)
Parameter Rating Unit
Cathode Voltage (VKA) 20 V
Continuous Cathode Current (IKA) 150 mA
Reference Input Current Range (IREF) -50µA to +10mA
Operating Junction Temperature -40 to +150 °C
Storage Temperature -55 to +150 °C
Operation above the absolute maximum rating may cause device failure.
Operation at the absolute maximum ratings, for extended periods, may reduce device reliability.
Package Thermal Data
Package JA PDIS
TA = +25°C, TJ = +150°C
SOT23 380°C/W 330mW
SOT23F 138°C/W 900mW
SOT25 250°C/W 500mW
SOT363 380°C/W 330mW
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Min Max Unit
VKA Cathode Voltage VREF 20 V
IKA Cathode Current 1 100 mA
TA Operating Ambient Temperature Range -40 +125 °C
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Conditions Min Typ Max Units
VREF Reference Voltage VKA = VREF
IKA = 10mA
ZTL43_A 2.475 2.5 2.525 V
ZTL43_B 2.487 2.5 2.513
VDEV Deviation of Reference Voltage Over Full
Temperature Range
VKA = VREF
IKA = 10 mA
TA = 0 to 70° 6 16
mV
TA = -40 to 85°C 14 34
TA = -40 to 125°C 14 34
VREF
VKA
Ratio of Change In Reference Voltage
To the Change In Cathode Voltage IKA = 10mA VKA = VREF to 10 -1.4 -2.7
mV/V
VKA = 10V to 20V -1.0 -2.0
IREF Reference Input Current IKA = 10mA, R1 = 10k, R2 = OC 2 4 µA
IREF
IREF Deviation Over Full Temperature Range
IKA = 10mA
R1 = 10k
R2 = OC
TA = 0 to 70°C 0.8 1.2
µA
TA = -40 to 85°C 0.8 2.5
TA = -40 to 125°C 0.8 2.5
I
KA(MIN)
Minimum Cathode Current for Regulation VKA = VREF 0.4 0.6 mA
IKA(OFF) Off State Current VKA = 20V, VREF =
0V 0.1 0.5 µA
RZ Dynamic Output Impedance VKA = VREF, f = 0Hz 0.2 0.5
ZTL431/ZTL432
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Typical Characteristics
I
KA
=10mA
V
REF
=V
KA
0
100
200
300
400
500
600
700
800
900
1000
0 255075100125
SOT23-5
SOT23
SC70-6
SOT23F
Ambient Temperature (°C)
Power Dissipation (
m
W)
Reference Voltage vs. Temperature
Dynamic Impedance vs. Frequency
Power Dissipation Derating
ZTL431/ZTL432
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Typical Characteristics (cont.)
I
KA
I
KA
I
KA
V
KA
V
KA
V
REF
<V
KA
<20,I
KA
=10mA,T
A
=25°C
V
KA
V
KA
Stability Boundary Condition
0
10
20
30
40
50
60
70
80
90
100
10.0E-12 100.0E-12 1.0E-9 10.0E-9 100.0E-9 1.0E-6
Load Capacitance (F)
Cathode Current (mA)
Gain vs. Frequency
0
10
20
30
40
50
60
100 1000 10000 100000 1000000
Frequency (Hz)
Gain (dB)
Stable
a
b
e
e
Stable
Pulse Response
Test Circuit for Stabilty Boundary Conditions
Test Circuit for Pulse Response
Test Circuit for Open Loop Voltage Gain
ZTL431/ZTL432
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Application Circuits
V
ON
~2V
V
OFF
=V
+
V
TH
=2.5V
Output
V+
Input
R1
R2
V
OUT
V
OUT
V+
V
REF
V
REF
R1
R2
V
OUT
V
OUT
V+
V
REF
V
REF
R1
R2
V
OUT
V
OUT
V+
V
REF
V
REF
V
OUT(MIN)
=V
REF
+V
REG
In Out
Common
ZSR***
0.01µF
30
R1
R2
V
REF
V+
V
OUT
V
OUT
V
REF
R1
R1
R2b
R2a
V
REF
VREF
VREF
V
REF
V+
Outpu
t
Shunt regulator
Output control of a three
terminal fixed regulator
Single supply comparator
with temperature
compensated threshold
Higher current shunt
regulator
Series regulator
Over voltage / under voltage
protection circuit
ZTL431/ZTL432
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DC Test Circuits
Notes
Deviation of reference input voltage, Vdev, is defined as the
maximum variation of the reference input voltage over the full
temperature range.
The average temperature coefficient of the reference input
voltage, VREF is defined as:
VREF(ppm/°C) = VDEV 1,000,000
VREF(T1-T2)
The dynamic output impedance, Rz, is defined as:
RZ = VZ
IZ
When the device is programmed with two external resistors, R1
and R2, (figure 2), the dynamic output impedance of the overall
circuit, R'z, is defined as:
R'Z = RZ (1 + R1 )
R2
Stability Boundary
The ZTL431 and ZTL432 are stable with a range of capacitive
loads. A zone of instability exists as demonstrated in the typical
characteristic graph on page 4. The graph shows typical
conditions. To ensure reliable stability a capacitor of 4.7nF or
greater is recommended between anode and cathode.
ZTL431/ZTL432
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Ordering Information
Tol. Ordering Code Pack Part Mark Status* Reel Size Tape Width
(mm)
Quantity per
Reel
1%
ZTL431AE5TA SOT25 31A Active 7”, 180mm 8 3000
ZTL431AFFTA SOT23F 31A Active 7”, 180mm 8 3000
ZTL431AFTA SOT23 31A Active 7”, 180mm 8 3000
ZTL431AQFTA (Note 4) SOT23 31A Active 7”, 180mm 8 3000
ZTL431AH6TA SOT363 31A Active 7”, 180mm 8 3000
ZTL431ASE5TA SOT25 S2A Active 7”, 180mm 8 3000
ZTL432AFFTA SOT23F 32A Active 7”, 180mm 8 3000
ZTL432AFTA SOT23 32A Active 7”, 180mm 8 3000
0.5%
ZTL431BE5TA SOT25 31B Active 7”, 180mm 8 3000
ZTL431BFFTA SOT23F 31B Active 7”, 180mm 8 3000
ZTL431BFTA SOT23 31B Active 7”, 180mm 8 3000
ZTL431BH6TA SOT363 31B Active 7”, 180mm 8 3000
ZTL432BFFTA SOT23F 32B Active 7”, 180mm 8 3000
ZTL432BFTA SOT23 32B Active 7”, 180mm 8 3000
Note: 4. Automotive products are AEC-Q100 qualified and are PPAP capable. Automotive, AEC-Q100 and standard products are electrically and thermally the
same, except where specified. For more information, please refer to http://www.diodes.com/quality/product_compliance_definitions/.
Package Outline Dimensions
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version.
SOT23
SOT23F
SOT23
Dim Min Max Typ
A 0.37 0.51 0.40
B 1.20 1.40 1.30
C 2.30 2.50 2.40
D 0.89 1.03 0.915
F 0.45 0.60 0.535
G 1.78 2.05 1.83
H 2.80 3.00 2.90
J 0.013 0.10 0.05
K 0.903 1.10 1.00
K1 - - 0.400
L 0.45 0.61 0.55
M 0.085 0.18 0.11
 0° 8° -
All Dimensions in mm
SOT23F
Dim Min Max Typ
A 0.80 1.00 0.90
A1 0.00 0.10 
b 0.35 0.45 0.40
c 0.10 0.20 0.15
D 2.80 3.00 2.90
e 0.95
e1 1.80 2.00 1.90
E 2.30 2.50 2.40
E1 1.50 1.70 1.60
L 0.48 0.68 0.58
L1 0.30 0.50 0.40
R 0.05 0.15 0.10
All Dimensions in mm
A
M
JL
D
F
BC
H
K
G
K1
b (X3)
E1 E
D
A
L1
c
A1
R
L
e
e1
ZTL431/ZTL432
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Package Outline Dimensions (cont.)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version.
SOT363
SOT25
T092
SOT363
Dim Min Max Typ
A 0.10 0.30 0.25
B 1.15 1.35 1.30
C 2.00 2.20 2.10
D 0.65 Typ
F 0.40 0.45 0.425
H 1.80 2.20 2.15
J 0 0.10 0.05
K 0.90 1.00 1.00
L 0.25 0.40 0.30
M 0.10 0.22 0.11
 0° 8° -
All Dimensions in mm
SOT25
Dim Min Max Typ
A 0.35 0.50 0.38
B 1.50 1.70 1.60
C 2.70 3.00 2.80
D   0.95
H 2.90 3.10 3.00
J 0.013 0.10 0.05
K 1.00 1.30 1.10
L 0.35 0.55 0.40
M 0.10 0.20 0.15
N 0.70 0.80 0.75
 0° 8°

All Dimensions in mm
TO92
Dim Min Max Typ
A 3.45 3.66 —
B 4.27 4.78
b — — 0.38
c — — 0.38
D — — 3.87
E 4.32 4.83
e — 1.27
e2 2.40 2.90 —
L 12.98 15.00 —
L1 12.80 15.00 —
L2 0.80 - —
L3 2.00 3.00 —
N 1.22 1.37 —
All Dimensions in mm
A
M
JL
D
B C
H
K
F
A
M
JL
D
B C
H
KN
EJECTION
MARK
LOOSE PRODUCT
TAPED PRODUCT
EJECTION
MARK
B
E
b
e
e
D
N
ce2 e2
L1
E
L2
L3
A
L
ZTL431/ZTL432
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Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
SOT23
SOT23F
SOT363
SOT25
Dimensions Value (in mm)
Z 2.9
X 0.8
Y 0.9
C 2.0
E 1.35
Dimensions Value (in mm)
C 0.95
X 0.60
Y 0.80
Y1 1.80
Dimensions Value (in mm)
Z 2.5
G 1.3
X 0.42
Y 0.6
C1 1.9
C2 0.65
Dimensions Value (in mm)
Z 3.20
G 1.60
X 0.55
Y 0.80
C1 2.40
C2 0.95
XE
Y
C
Z
C
Y1
Y (3x)
X (3x)
X
Z
Y
C1
C2
C2
G
X
Z
Y
C1
C2C2
G
ZTL431/ZTL432
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