TL431 family
Adjustable precision shunt regulator
Rev. 02 — 20 January 2010
Product data sheet
1. General description
Three-terminal shunt regulator family with an output voltage range between V
ref
and 36 V,
to be set by two external resistors.
Table 1.
Product overview
Temperature range (T
amb
)
0 to 70
°C
TL431CDBZR
−40
to 85
°C
TL431IDBZR
−40
to 125
°C
TL431QDBZR
TL431SDT
TL431MSDT
1%
TL431ACDBZR TL431AIDBZR
TL431ASDT
TL431AMSDT
0.5 %
TL431BCDBZR TL431BIDBZR
TL431BSDT
TL431BMSDT
Pinning
configuration
(see
Table 5)
normal pinning
normal pinning
mirrored pinning
normal pinning
mirrored pinning
normal pinning
mirrored pinning
Reference voltage
tolerance (V
ref
)
2%
TL431AQDBZR normal pinning
TL431BQDBZR normal pinning
2. Features
Programmable output voltage up to 36 V
Three different reference voltage tolerances:
Standard grade: 2 %
A-Grade: 1 %
B-Grade: 0.5 %
Typical temperature drift: 6 mV (in a range of 0
°C
up to 70
°C)
Low output noise
Typical output impedance: 0.2
Ω
Sink current capability: 1 mA to 100 mA
AEC-Q100 qualified (grade 1)
3. Applications
Shunt regulator
Precision current limiter
Precision constant current sink
NXP Semiconductors
TL431 family
Adjustable precision shunt regulator
4. Quick reference data
Table 2.
Symbol
V
KA
I
K
V
ref
Quick reference data
Parameter
cathode-anode voltage
cathode current
reference voltage
Standard-Grade (2 %)
A-Grade (1 %)
B-Grade (0.5 %)
V
KA
= V
ref
;
I
K
= 10 mA
2440
2470
2483
2495
2495
2495
2550
2520
2507
mV
mV
mV
Conditions
Min
V
ref
1
Typ
-
-
Max
36
100
Unit
V
mA
5. Ordering information
Table 3.
Ordering information
Package
Name
TL431CDBZR
TL431IDBZR
TL431QDBZR
TL431SDT
TL431MSDT
TL431ACDBZR
TL431AIDBZR
TL431AQDBZR
TL431ASDT
TL431AMSDT
TL431BCDBZR
TL431BIDBZR
TL431BQDBZR
TL431BSDT
TL431BMSDT
-
Description
plastic surface-mounted package; 3 leads
Version
SOT23
Type number
TL431_FAM_2
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 20 January 2010
2 of 23
NXP Semiconductors
TL431 family
Adjustable precision shunt regulator
6. Marking
Table 4.
Marking codes
Marking code
[1]
CA*
CB*
CC*
RM*
LR*
CD*
CE*
CF*
Type number
TL431ASDT
TL431AMSDT
TL431BCDBZR
TL431BIDBZR
TL431BQDBZR
TL431BSDT
TL431BMSDT
-
Marking code
[1]
RL*
LQ*
CG*
CH*
CJ*
MA*
MB*
-
Type number
TL431CDBZR
TL431IDBZR
TL431QDBZR
TL431SDT
TL431MSDT
TL431ACDBZR
TL431AIDBZR
TL431AQDBZR
[1]
* = -: made in Hong Kong
* = p: made in Hong Kong
* = t: made in Malaysia
* = W: made in China
7. Functional diagram
The TL431 family comprises a range of 3-terminal adjustable shunt regulators, with
specified thermal stability over applicable automotive and commercial temperature
ranges. The output voltage may be set to any value between V
ref
(approximately 2.5 V)
and 36 V with two external resistors (see
Figure 8).
These devices have a typical output
impedance of 0.2
Ω.
Active output circuitry provides a very sharp turn-on characteristic,
making these devices excellent replacements for Zener diodes in many applications like
on-board regulation, adjustable power supplies and switching power supplies.
CATHODE
REF
V
ref
ANODE
006aab569
Fig 1.
Functional diagram
TL431_FAM_2
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 20 January 2010
3 of 23
NXP Semiconductors
TL431 family
Adjustable precision shunt regulator
8. Pinning information
Table 5.
Pin
1
2
3
Pinning
Symbol
k
REF
a
Description
cathode
reference
anode
1
2
3
a
REF
k
006aab355
Simplified outline
Graphic symbol
Normal pinning: All types except TL431AMSDT, TL431BMSDT and TL431MSDT
Mirrored pinning: TL431AMSDT, TL431BMSDT and TL431MSDT
1
2
3
REF
k
a
reference
cathode
anode
1
2
3
a
REF
k
006aab355
9. Limiting values
Table 6.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
V
KA
I
K
I
ref
P
tot
Parameter
cathode-anode voltage
cathode current
reference current
total power dissipation
T
amb
≤
25
°C
[1]
[2]
[3]
Conditions
Min
-
−100
−0.05
-
-
-
-
0
−40
−40
−65
Max
37
150
10
350
580
950
150
+70
+85
+125
+150
Unit
V
mA
mA
mW
mW
mW
°C
°C
°C
°C
°C
T
j
T
amb
junction temperature
ambient temperature
TL431XCDBZR
TL431XIDBZR
TL431XQDBZR
TL431XSDT
T
stg
[1]
[2]
[3]
storage temperature
Device mounted on an FR4 Printed-Circuit Board (PCB), single-sided copper, tin-plated and standard
footprint.
Device mounted on an FR4 PCB, single-sided copper, tin-plated, mounting pad for collector 1 cm
2
.
Device mounted on a ceramic PCB, Al
2
O
3
, standard footprint.
TL431_FAM_2
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 20 January 2010
4 of 23
NXP Semiconductors
TL431 family
Adjustable precision shunt regulator
1250
P
tot
(mW)
1000
(1)
006aab570
750
(2)
500
(3)
250
0
−75
−25
25
75
125
175
T
amb
(°C)
(1) Ceramic PCB, Al
2
O
3
, standard footprint
(2) FR4 PCB, mounting pad for collector 1 cm
2
(3) FR4 PCB, standard footprint
Fig 2.
Power derating curves
Table 7.
ESD maximum ratings
T
amb
= 25
°
C unless otherwise specified.
Symbol
V
ESD
Parameter
electrostatic discharge voltage
Conditions
MIL-STD-883
(human body model)
Min
-
Max
4
Unit
kV
10. Recommended operating conditions
Table 8.
Symbol
V
KA
I
K
Operating conditions
Parameter
cathode-anode voltage
cathode current
Conditions
Min
V
ref
1
Max
36
100
Unit
V
mA
TL431_FAM_2
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 20 January 2010
5 of 23
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