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 two 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)
Cathode
3
1
Anode
Ref
2
ZTL432_F SOT23, ZTL432_FF SOT23F
(Top View)
Ref
3
1
Anode
Cathode
2
ZTL431_H6, SOT363
(Top View)
Cathode
1
6
Anode
5
N/C
4
NC
†
Features
Temperature Range ................ -40°C to +125°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
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device
(Note 3)
N/C
†
2
Ref
3
†Connected internally to substrate;
should be left floating or connected to Anode
ZTL431ASE5 SOT25
(Top View)
Cathode
1
5
N/C
Anode
2
Ref
3
Applications
Opto-Coupler Linearization
Linear Regulators
Improved Zener
Variable Reference
4
N/C
ZTL431_E5 SOT25
(Top View)
N/C
1
5
Anode
N/C*
2
Cathode
3
4
Ref
*
must be left floating or
connected to pin 5
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.
ZTL431/ZTL432
Document number: DS33263 Rev. 17 - 2
1 of 10
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August 2015
© Diodes Incorporated
ZTL431/ZTL432
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
Rating
20
150
-50μA to +10mA
-40 to +150
-55 to +150
Unit
V
mA
-
°C
°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
SOT23
SOT23F
SOT25
SOT363
JA
P
DIS
T
A
= +25°C, T
J
= +150°C
330mW
900mW
500mW
330mW
380°C/W
138°C/W
250°C/W
380°C/W
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Symbol
V
KA
I
KA
T
A
Parameter
Cathode Voltage
Cathode Current
Operating Ambient Temperature Range
Min
V
REF
1
-40
Max
20
100
+125
Unit
V
mA
°C
Electrical Characteristics
Symbol
V
REF
Reference Voltage
(@T
A
= +25°C, unless otherwise specified.)
Conditions
ZTL43_A
ZTL43_B
T
A
= 0 to +70°
T
A
= -40 to +85°C
T
A
= -40 to +125°C
V
KA
= V
REF
to 10
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
Units
V
Parameter
V
KA
= V
REF
I
KA
= 10mA
V
KA
= V
REF
I
KA
= 10 mA
I
KA
= 10mA
V
DEV
V
REF
V
KA
I
REF
Deviation of Reference Voltage Over Full
Temperature Range
Ratio of Change In Reference Voltage
To the Change In Cathode Voltage
Reference Input Current
I
KA
=
10mA, R1 = 10kΩ, R
2
= OC
I
REF
I
KA(MIN)
I
KA(OFF)
R
Z
I
KA
= 10mA
R
1
= 10kΩ
I
REF
Deviation Over Full Temperature Range
R
2
= OC
Minimum Cathode Current for Regulation
Off-State Current
Dynamic Output Impedance
V
KA
= V
REF
V
KA
= 20V, V
REF
=
0V
V
KA
= V
REF
, f = 0Hz -
ZTL431/ZTL432
Document number: DS33263 Rev. 17 - 2
2 of 10
www.diodes.com
August 2015
© Diodes Incorporated
ZTL431/ZTL432
Typical Characteristics
I
KA
= 10mA
Reference Voltage vs. Temperature
V
REF
= V
KA
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
ZTL431/ZTL432
Document number: DS33263 Rev. 17 - 2
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August 2015
© Diodes Incorporated
ZTL431/ZTL432
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
ab e
b
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
ZTL431/ZTL432
Document number: DS33263 Rev. 17 - 2
V
REF
< V
KA
< 20, I
KA
= 10mA, T
A
= 25°C
Test Circuit for Stabilty Boundary Conditions
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ZTL431/ZTL432
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
REF
R2
V
OUT
V
OUT
V
REF
V
OUT
V
REF
Output control of a three
terminal fixed regulator
Series regulator
V+
V+
R1
Output
V
REF
R1
V
REF
Output
Input
V
TH
= 2.5V
V
ON
~
2V
V
OFF
= V
+
R2a
R2b
V
REF
V
REF
Single supply comparator
with temperature
compensated threshold
ZTL431/ZTL432
Document number: DS33263 Rev. 17 - 2
Over voltage / under voltage
protection circuit
5 of 10
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August 2015
© Diodes Incorporated
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