ZHT431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Description
The ZHT431 is a three terminal adjustable shunt regulator offering
excellent temperature stability and output current handling capability
up to 100mA. The device offers extended operating temperature
range working from -55 to +125°
C.
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.
Pin Assignments
(Top View)
SOT23
V
Z
GND
V
REF
(Top View)
SOT23 (Type DN)
Features
Surface Mount SOT23 (Type DN) Package
0.5%, 1% and 2% Tolerance
Maximum Temperature Coefficient 67ppm/°
C
Temperature Compensated
Temperature Range
Programmable Output Voltage
50μA to 100mA Current Sink Capability
Low Output Noise
Wide Temperature Range -55 to +125°
C
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
for
Operation
Over
the
Full
Applications
Series and Shunt Regulator
Voltage Monitor
Over Voltage / Under Voltage Protection
Switch Mode Power Supplies
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, Antimony and Beryllium-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br +
Cl), <1000ppm antimony compounds and <1000ppm Beryllium.
Typical Application Circuit
V
Z
V
REF
GND
ZHT431
Document number: DS32157 Rev. 12 - 2
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April 2018
© Diodes Incorporated
ZHT431
Absolute Maximum Ratings
(Voltages to GND Unless Otherwise Stated.)
Parameter
Cathode Voltage (V
Z
)
Cathode Current
Operating Temperature
Storage Temperature
Power Dissipation
(T
A
= +25° T
JMAX
= +150°
C,
C)
Rating
20
150
-55 to +125
-55 to +150
330
Unit
V
mA
°
C
°
C
mW
Recommended Operating Conditions
Parameter
Cathode Voltage V
REF
Cathode Current
Min
—
0.05
Max
20
100
Unit
V
mA
Electrical Characteristics
(Test conditions unless otherwise specified: T
A
= +25°
C.)
Symbol
V
REF
VParameter
Reference Voltage
2%
1%
0.5%
Values
Min.
2.45
2.475
2.4875
—
—
—
—
—
—
—
—
Typ.
2.50
2.50
2.50
10
-1.85
-1.0
0.12
0.04
35
—
—
Max.
2.55
2.525
2.5125
30
-2.7
-2.0
1.0
0.2
50
0.1
0.75
Unit
Conditions
I
L
= 10mA (Fig.1),
V
Z
= V
REF
I
L
= 10mA, V
Z
= V
REF
T
A
= Full Range (Fig.1)
V
Z
from V
REF
to 10V
I
Z
= 10mA (Fig.2)
V
Z
from 10V to 20V
I
Z
= 10mA (Fig.2)
R1 = 10k, R2 = O/C,
l
L
= 10mA (Fig.2)
R1 = 10k, R2 = O/C,
I
L
=10mA, T
A
= Full Range (Fig.2)
V
Z
= V
REF
(Fig.1)
V
Z
= 20V, V
REF
= 0V (Fig.3)
V
Z
= V
REF
(Fig.1), f = 0Hz,
I
C
= 1mA to 100mA
V
V
DEV
ΔV
REF
ΔV
Z
Deviation of Reference Input Voltage Over
Temperature
Ratio of the Change in Reference Voltage to
the Change in Cathode Voltage
mV
mV/V
mV/V
µA
µA
µA
µA
V
I
REF
ΔI
REF
I
ZMIN
I
ZOFF
R
Z
Reference Input Current
Deviation of Reference Input Current Over
Temperature
Minimum Cathode Current for Regulation
Off-state Current
Dynamic Output Impedance
Deviation of reference input voltage, V
DEV
, 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, V
REF
is defined as:
The dynamic output impedance, R
Z
, is defined as:
When the device is programmed with two external resistors, R1 and R2,
(Fig. 2), the dynamic output impedance of the overall circuit, R’, is defined as:
ZHT431
Document number: DS32157 Rev. 12 - 2
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April 2018
© Diodes Incorporated
ZHT431
Typical Operating Conditions
170
160
0
I
Z
= 10mA
Change in Reference Output Voltage (mV)
-50
-25
0
25
50 75 100 125
Temperature (°
C)
I
R EF
vs. Temperature
-5
Reference Current (nA)
150
140
130
120
110
100
90
-10
-15
-20
-25
0
10
15
Cathode Voltage (V)
Change in V
REF
vs. Cathode Voltage
V
REF
= V
Z
5
20
40
38
100
1mA
A)
Minimum Cathode Current (µ
Dynamic Impedance (
)
36
10
10mA
34
32
30
28
26
1.0
24
-50
-25
0
25
50 75 100 125
Temperature (°
C)
I
Z MIN
vs. Temperature
0.1
100
10K
100K
Frequency (Hz)
Dynamic Impedance vs. Frequency
1K
1M
2.502
2.500
0.5
0.4
2.498
Reference Voltage (V)
2.496
2.494
2.492
2.490
Power Dissipation (W)
-50
-25
0
25
50 75 100 125
Temperature ( °
C)
V
REF
vs. Temperature
0.3
0.2
0.1
2.488
2.486
0
0
25
50
75
100
125
Ambient Temperature (°
C)
Power Dissipation Derating
150
ZHT431
Document number: DS32157 Rev. 12 - 2
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ZHT431
Typical Operating Conditions
(Cont.)
60
Open Lo op Vol t age Gai n (dB)
V
Z
I
Z
40
230
15k
9µF
20
+
8k25
-
0
100
1k
10k
100k
1M
Frequency (Hz)
I
Z
= 10mA,
T
A
= 25°
C
Gain v Frequency
Test Circuit for Open Loop Voltage Gain
220
3.0
Repetitive pulse
Input Monitor
V
Z
Vol t ag e Sw i ng (V)
2.0
Single pulse
1.0
V
Z
Pulse
Generator
50
0
5.0
0
INPUT
0
0.2
0.4
0.6
0.8
1.0
Time (
µ
s)
T
A
= 25°
C
Pulse Response
100
Test Circuit for Pulse Response
150
V
Z
Input
80
Cat hode Curr ent (m A)
I
Z
STABLE
60
STABLE
10k
40
20
0
10p
100p
1000p
0.01
µ
0.1
µ
1µ
Load Capacitance (F)
V
< V
V
Z
20V
C
V
REF
ref
<
Z
<
< 20, I
Z
= 10mA, T
A
= 25°
Stability Boundary Conditions
Test Circuit for Stability Boundary Conditions
ZHT431
Document number: DS32157 Rev. 12 - 2
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April 2018
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ZHT431
DC Test Circuits
I
L
Input
V
Z
I
Z
I
L
Input
V
Z
I
Z
Input
V
Z
I
ZOFF
I
ref
R1
I
ref
V
ref
R2
V
ref
Fig 1 - Test circuit for V
Z
= V
ref
Fig 2 - Test circuit for V
Z
> V
ref
Fig 3 - Test circuit for
Off state current
†
ZHT431
Document number: DS32157 Rev. 12 - 2
5 of 9
www.diodes.com
April 2018
© Diodes Incorporated
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