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
to 125°C as standard.
Features
•
•
Temperature range ................ -40 to 125°C
Reference voltage tolerance at 25°C
•
•
•
•
•
0.2
0.5% ..................................... B grade
1% ......................................... A grade
typical output impedance
Applications
•
•
•
•
Opto-coupler linearization
Linear regulators
Improved zener
Variable reference
Sink current capability ...... 1mA to 100mA
Adjustable output voltage ...... V
REF
to 20V
Pin connections
ZTL431_F SOT23
ZTL431_FF SOT23F
(top view)
ZTL432_F SOT23
ZTL432_FF SOT23F
(top view)
ZTL431_H6 SC70-6
(top view)
Cathode 3
1 Anode
Ref 2
Ref 3
1 Anode
Cathode 2
Cathode 1
N/C
†
2
REF 3
6 Anode
5 N/C
†
4 NC
† Connected internally to
substrate; should be left
floating or connected to Anode
ZTL431ASE5 SOT235
(top view)
ZTL431_E5 SOT235
(top view)
Cathode 1
Anode 2
Ref 3
5 N/C
N/C 1
N/C* 2
5 Anode
4 N/C
Cathode 3
4 Ref
*
must be left floating
or connected to pin 5
Issue 14 - January 2008
© Zetex Semiconductors plc 2007
1
www.zetex.com
ZTL431, ZTL432
Ordering information
Tol.
Order code
ZTL431ACSTZ
ZTL431AE5TA
ZTL431AFFTA
1%
ZTL431AFTA
ZTL431AH6TA
ZTL431ASE5TA
ZTL432AFFTA
ZTL432AFTA
ZTL431BCSTZ
ZTL431BE5TA
ZTL431BFFTA
0.5%
ZTL431BFTA
ZTL431BH6TA
ZTL432BFFTA
ZTL432BFTA
Pack
TO92
SOT23-5
SOT23F
SOT23
SC70-6
SOT23-5
SOT23F
SOT23
TO92
SOT23-5
SOT23F
SOT23
SC70-6
SOT23F
SOT23
Part mark
ZTL431A
31A
31A
31A
31A
S2A
32A
32A
ZTL431B
31B
31B
31B
31B
32B
32B
Status
*
Obsolete
Active
Active
Active
Active
Active
Active
Active
Obsolete
Active
Active
Active
Active
Active
Active
Reel Size
Concertina
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
Concertina
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
Tape width
(mm)
N/A
8
8
8
8
8
8
8
N/A
8
8
8
8
8
8
Quantity
per reel
1500
3000
3000
3000
3000
3000
3000
3000
1500
3000
3000
3000
3000
3000
3000
NOTES:
* For availability of preview status devices contact your local Zetex representative
Absolute maximum ratings
Cathode voltage (V
KA
) .............................................................. 20V
Continuous cathode current (I
KA
) ........................................ 150mA
Reference input current range (I
REF
)..................... -50 µA 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.
Unless otherwise stated voltages specified are relative to the ANODE pin.
Package thermal data
Package
TO92
SOT23
SOT23F
SOT23-5
SOT70-6
JA
P
DIS
T
A
=25°C, T
J
= 150°C
780mW
330mW
900mW
500mW
330mW
160°C/W
380°C/W
138°C/W
250°C/W
380°C/W
Issue 14 - January 2008
© Zetex Semiconductors plc 2007
2
www.zetex.com
ZTL431, ZTL432
Recommended operating conditions
V
KA
I
KA
T
A
Cathode voltage
Cathode current
Operating ambient temperature range
Min
V
ref
1
-40
Max
20
100
125
Units
V
mA
°C
Electrical characteristics
Electrical characteristics over recommended operating conditions, T
A
= 25°C, unless otherwise stated.
Symbol Parameter
V
REF
Reference voltage
V
DEV
Conditions
V
KA
= V
REF
I
KA
= 10mA
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
I
KA
= 10mA
V
KA
= 10V to 20V
Min.
2.475
2.487
Typ.
2.5
2.5
6
14
14
-1.4
-1.0
Max.
2.525
2.513
16
34
34
-2.7
-2.0
mV/V
mV
Units
V
Deviation of reference
voltage over full
V
KA
= V
REF
temperature range
I
KA
= 10 mA
Ratio of change in
reference voltage
to the change in
cathode voltage
Reference input
current
ΔV
REF
ΔV
KA
I
REF
I
KA
= 10mA, R1 = 10k
R
2
= OC
T
A
= 0 to 70°C
T
A
= -40 to 85°C
T
A
= -40 to 125°C
2
0.8
0.8
0.8
0.4
0.1
0.2
4
1.2
2.5
2.5
0.6
0.5
0.5
µA
ΔI
REF
I
KA
= 10mA
I
REF
deviation over full R
1
= 10k
temperature range
R
2
= OC
µA
I
KA(MIN)
Minimum cathode
V
KA
= V
REF
current for regulation
I
KA(OFF)
Off state current
V
KA
= 20V, V
REF
= 0V
R
Z
Dynamic output
impedance
V
KA
= V
REF
, f = 0Hz
mA
µA
Issue 14 - January 2008
© Zetex Semiconductors plc 2007
3
www.zetex.com
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