TL431
TL432
Automotive adjustable voltage reference
Datasheet
-
production data
Applications
Power supply
Industrial
Automotive
Z
TO-92
(Plastic package)
L
SOT23-3
Description
The TL431 and TL432 are adjustable shunt
voltage references with guaranteed temperature
stability over the entire operating temperature
range. The device temperature range is extended
for the automotive version from -40 °C up to
+125 °C. The output voltage can be set to any
value between 2.5 and 36 V with two external
resistors. The TL431 and TL432 operate with a
wide current range from 1 to 100 mA with a typical
dynamic impedance of 0.22 Ω.
L
SOT23-5
C
SOT323-6
D
SO-8
(Batwing plastic micropackage)
Features
AEC-Q100 qualified
Adjustable output voltage: 2.5 to
36 V
Sink current capability: 1 to 100 mA
Typical output impedance: 0.22 Ω
0.5% voltage precision only on the TL431B
version
1% and 2% voltage precision
Automotive temp. range -40 °C to +125 °C
February 2021
This is information on a product in full production.
DocID4467 Rev 15
1/22
www.st.com
Contents
TL431, TL432
Contents
1
2
3
Schematic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Reference input voltage deviation overtemperature range . . . . . . . . . . . . . . . . . . . 8
4
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1
4.2
4.3
4.4
4.5
4.6
SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TO-92 ammopack and tape and reel package information . . . . . . . . . . . 14
TO-92 (bulk) package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SOT23-3 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SOT23-5 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SOT323-6 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5
6
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2/22
DocID4467 Rev 15
TL431, TL432
Schematic diagrams
1
Schematic diagrams
Figure 1. TO-92 pin connections (top view)
Figure 2. SO-8 batwing pin connections (top view)
SO8
Cathode 1
Anode 2
3
NC 4
8 Ref
7 Anode
6
5 NC
Figure 3. SOT23-5 and SOT23-3 pin connections (top view)
SOT23-5
NC
NC
Cathode
1
2
3
4 Ref
Ref
2
3 Anode
5 Anode
Cathode 1
SOT23-3
TL431
TL431
Figure 4. SOT323-6 pin connections (top view)
TL432
Figure 5. TL431 and TL432 block diagram
Cathode
Ref
Vref
Anode
DocID4467 Rev 15
3/22
22
Absolute maximum ratings and operating conditions
TL431, TL432
2
Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings
Symbol
V
KA
I
k
I
ref
Parameter
Cathode to anode voltage
Continuous cathode current range
Reference input current range
Thermal resistance junction to case
TO-92
SO-8 batwing
SOT23-3L
SOT23-5L
SOT323-6L
Thermal resistance junction to ambient
TO-92
SO-8 batwing
SOT23-3L
SOT23-5L
SOT323-6L
Storage temperature range
Junction temperature
TL431IY, TL431AIY-T: HBM (human body model)
(1)
TL431-TL432: HBM (human body model)
MM: machine model
(2)
CDM: charged device model
(3)
Value
37
-100 to +150
-0.05 to +10
57
30
136
67
110
200
85
248
157
221
-65 to +150
150
3000
2000
200
1500
Unit
V
mA
mA
R
thjc
°C/W
R
thja
°C/W
T
stg
T
J
°C
°C
ESD
V
1. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 kresistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.
2. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5
).
This is done for all couples of
connected pin combinations while the other pins are floating.
3. Charged device model: all pins and the package are charged together to the specified voltage and then
discharged directly to the ground through only one pin. This is done for all pins.
Table 2. Operating conditions
Symbol
V
KA
I
k
Parameter
Cathode to anode voltage
Cathode current
Operating free-air temperature range
TL431C/AC
TL431I/AI - TL432I/AI
TL431B
TL431IY/AIY
Value
V
ref
to 36
1 to 100
0 to +70
-40 to +105
-40 to +125
-40 to +125
Unit
V
mA
T
oper
°C
4/22
DocID4467 Rev 15
TL431, TL432
Electrical characteristics
3
Electrical characteristics
Table 3. TL431C (T
amb
= 25 °C unless otherwise specified)
TL431C
TL431AC
Unit
Min.
V
ref
Reference input voltage
V
KA
= V
ref
, I
k
= 10 mA, T
amb
= 25 °C
T
min
T
amb
T
max
Reference input voltage deviation overtemperature
range
(1)
V
KA
= V
ref
, I
k
= 10 mA, T
min
T
amb
T
max
Ratio of change in reference input voltage to change
in cathode to anode voltage
I
k
= 10 mA -
V
KA
= 10 V to V
ref
V
KA
= 36 V to 10 V
Reference input current
I
k
= 10 mA, R1 = 10 k, R2 =
T
amb
= 25 °C
T
min
T
amb
T
max
Reference input current deviation overtemperature
range
I
k
= 10 mA, R1 = 10 k, R2 =
T
min
T
amb
T
max
Minimum cathode current for regulation
V
KA
= V
ref
Off-state cathode current
Dynamic impedance
(2)
V
KA
= V
ref
,
I
k
= 1 to 100 mA, f
1 kHZ
Typ.
Max.
Min.
Typ.
Max.
V
Symbol
Parameter
2.44 2.495 2.55 2.47 2.495 2.52
2.423
-
2.567 2.453
-
2.537
V
ref
mV
-
3
17
-
3
15
Vref
------------
Vka
-2.7
-2
-1.4
-1
-
-
-2.7
-2
-1.4
-1
-
-
mV/V
I
ref
-
-
1.8
-
4
5.2
-
-
1.8
-
4
5.2
µA
I
ref
µA
-
-
-
-
0.4
0.5
2.6
0.22
1.2
1
1000
0.5
-
-
-
-
0.4
0.5
2.6
0.22
1.2
0.6
1000
0.5
mA
nA
I
min
I
off
½ZKA½
1. See definition of
Section : Reference input voltage deviation overtemperature range.
V
KA
2. The dynamic impedance is defined as
ZKA
=
---------------
-
I
k
DocID4467 Rev 15
5/22
22
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