SO
T2
TL431 family
Adjustable precision shunt regulator
Rev. 4 — 30 June 2011
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.
3
•
The TL431xDBZR types feature an enhanced stability area with a very low
load capacity requirement.
•
The TL431xFDT types offer an enhanced stability area and a higher
ElectroMagnetic Interference (EMI) ruggedness, for example, for Switch Mode Power
Supply (SMPS) applications.
•
The TL431xSDT types are designed for standard requirements and linear
applications.
Table 1.
Product overview
Temperature range (T
amb
)
0 to 70
C
TL431CDBZR
40
to 85
C
TL431IDBZR
40
to 125
C
TL431QDBZR
TL431FDT
TL431MFDT
TL431SDT
TL431MSDT
1%
TL431ACDBZR TL431AIDBZR
TL431AFDT
TL431AMFDT
TL431ASDT
TL431AMSDT
0.5 %
TL431BCDBZR TL431BIDBZR
TL431BFDT
TL431BMFDT
TL431BSDT
TL431BMSDT
Pinning
configuration
(see
Table 5)
normal pinning
normal pinning
mirrored pinning
normal pinning
mirrored pinning
normal pinning
mirrored 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
NXP Semiconductors
TL431 family
Adjustable precision shunt regulator
2. Features and benefits
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
Sink current capability: 1 mA to 100 mA
AEC-Q100 qualified (grade 1)
3. Applications
Shunt regulator
Precision current limiter
Precision constant current sink
Isolated feedback loop for Switch Mode Power Supply (SMPS)
4. Quick reference data
Table 2.
Symbol
V
KA
I
K
V
ref
Quick reference data
Parameter
cathode-anode voltage
cathode current
reference voltage
V
KA
= V
ref
;
I
K
= 10 mA;
T
amb
= 25
C
2440
2470
2483
2495
2495
2495
2550
2520
2507
mV
mV
mV
Conditions
Min
V
ref
1
Typ
-
-
Max
36
100
Unit
V
mA
Standard-Grade (2 %)
A-Grade (1 %)
B-Grade (0.5 %)
TL431_FAM
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 4 — 30 June 2011
2 of 27
NXP Semiconductors
TL431 family
Adjustable precision shunt regulator
5. Ordering information
Table 3.
Ordering information
Package
Name
TL431CDBZR
TL431IDBZR
TL431QDBZR
TL431FDT
TL431MFDT
TL431SDT
TL431MSDT
TL431ACDBZR
TL431AIDBZR
TL431AQDBZR
TL431AFDT
TL431AMFDT
TL431ASDT
TL431AMSDT
TL431BCDBZR
TL431BIDBZR
TL431BQDBZR
TL431BFDT
TL431BMFDT
TL431BSDT
TL431BMSDT
-
Description
plastic surface-mounted package; 3 leads
Version
SOT23
Type number
TL431_FAM
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 4 — 30 June 2011
3 of 27
NXP Semiconductors
TL431 family
Adjustable precision shunt regulator
6. Marking
Table 4.
Marking codes
Marking code
[1]
CA*
CB*
CC*
AR*
AU*
RM*
LR*
CD*
CE*
CF*
AS*
AV*
Type number
TL431ASDT
TL431AMSDT
TL431BCDBZR
TL431BIDBZR
TL431BQDBZR
TL431BFDT
TL431BMFDT
TL431BSDT
TL431BMSDT
-
-
-
Marking code
[1]
RL*
LQ*
CG*
CH*
CJ*
AT*
AW*
MA*
MB*
-
-
-
Type number
TL431CDBZR
TL431IDBZR
TL431QDBZR
TL431FDT
TL431MFDT
TL431SDT
TL431MSDT
TL431ACDBZR
TL431AIDBZR
TL431AQDBZR
TL431AFDT
TL431AMFDT
[1]
* = placeholder for manufacturing site code.
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
.
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
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 4 — 30 June 2011
4 of 27
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 without MFDT and MSDT ending
Mirrored pinning: All types with MFDT and MSDT ending
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
Max
37
150
10
350
580
950
150
+70
+85
+125
Unit
V
mA
mA
mW
mW
mW
C
C
C
C
T
j
T
amb
junction temperature
ambient temperature
TL431XCDBZR
TL431XIDBZR
TL431XQDBZR
TL431XFDT
TL431XSDT
T
stg
[1]
[2]
[3]
storage temperature
65
+150
C
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 anode 1 cm
2
.
Device mounted on a ceramic PCB, Al
2
O
3
, standard footprint.
TL431_FAM
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 4 — 30 June 2011
5 of 27
