TL431 family
Rev. 6 — 9 January 2019
Adjustable precision shunt regulators
Product data sheet
1. Product profile
1.1. General description
Three-terminal shunt regulator family with an output voltage range between
V
ref
= 2.495 V
and 36 V, to be set by two external resistors.
Table 1. Product overview
Reference voltage Temperature range (T
amb
)
tolerance (V
ref
)
0 °C to 70 °C
-40 °C to 85 °C
2.0 %
TL431CDBZR
TL431IDBZR
Pinning configuration
(see Table 5)
normal pinning
normal pinning
mirrored pinning
normal pinning
normal pinning
mirrored pinning
normal pinning
normal pinning
mirrored pinning
-40 °C to 125 °C
TL431QDBZR
TL431FDT
TL431MFDT
1.0 %
TL431ACDBZR
TL431AIDBZR
TL431AQDBZR
TL431AFDT
TL431AMFDT
0.5 %
TL431BCDBZR
TL431BIDBZR
TL431BQDBZR
TL431BFDT
TL431BMFDT
1.2. 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: 9 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)
•
•
•
•
•
Nexperia
TL431 family
Adjustable precision shunt regulators
1.3. Applications
•
•
•
•
Shunt regulator
Precision current limiter
Precision constant current sink
Isolated feedback loop for Switch Mode Power Supply (SMPS)
1.4. Quick reference data
Table 2. Quick reference data
Symbol Parameter
V
KA
I
K
V
ref
cathode-anode voltage
cathode current
reference voltage
•
•
•
Standard-Grade (2.0 %)
A-Grade (1.0 %)
B-Grade (0.5 %)
V
KA
= V
ref
; I
K
= 10 mA;
T
amb
= 25 °C
Conditions
Min
V
ref
1
2440
2470
2483
Typ
-
-
2495
2495
2495
Max
36
100
2550
2520
2507
Unit
V
mA
mV
mV
mV
2. Pinning information
Table 3. Pinning
Pin
Symbol
1
2
3
K
REF
A
Description
cathode
reference
anode
1
2
Simplified outline
3
Graphic symbol
REF
A
K
006aab355
SOT23; normal pinning: All types without MFDT ending
SOT23; mirrored pinning: All types with MFDT ending
1
2
3
REF
K
A
reference
cathode
anode
1
2
3
REF
A
K
006aab355
TL431_FAM
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 6 — 9 January 2019
2 / 19
Nexperia
TL431 family
Adjustable precision shunt regulators
3. Ordering information
Table 4. Ordering information
Type number
Package
Name
TL431CDBZR
TL431IDBZR
TL431QDBZR
TL431FDT
TL431MFDT
TL431ACDBZR
TL431AIDBZR
TL431AQDBZR
TL431AFDT
TL431AMFDT
TL431BCDBZR
TL431BIDBZR
TL431BQDBZR
TL431BFDT
TL431BMFDT
Description
Version
SOT23
TO-236AB plastic surface-mounted package; 3 leads
4. Marking
Table 5. Marking codes
Type number
Marking code
[1]
TL431CDBZR
TL431IDBZR
TL431QDBZR
TL431FDT
TL431MFDT
TL431ACDBZR
TL431AIDBZR
TL431AQDBZR
[1]
Type number
TL431AFDT
TL431AMFDT
TL431BCDBZR
TL431BIDBZR
TL431BQDBZR
TL431BFDT
TL431BMFDT
-
Marking code
[1]
AS%
AV%
CG%
CH%
CJ%
AT%
AW%
-
CA%
CB%
CC%
AR%
AU%
CD%
CE%
CF%
% = placeholder for manufacturing site code.
TL431_FAM
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 6 — 9 January 2019
3 / 19
Nexperia
TL431 family
Adjustable precision shunt regulators
5. 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 can 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
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 6 — 9 January 2019
4 / 19
Nexperia
TL431 family
Adjustable precision shunt regulators
6. 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
Conditions
Min
-
-100
-0.05
[1]
-
[2]
-
[3]
-
T
j
T
amb
junction temperature
ambient temperature
TL431XCDBZR
TL431XIDBZR
TL431XQDBZR
TL431XFDT
T
stg
[1]
[2]
[3]
Max
37
150
10
350
580
950
150
+70
+85
+125
+150
Unit
V
mA
mA
mW
mW
mW
°C
°C
°C
°C
°C
-
0
-40
-40
-65
storage temperature
Device mounted on an FR4 Printed-Circuit Board (PCB), single-sided copper, tin-plated and standard
footprint.
2
Device mounted on an FR4 PCB, single-sided copper, tin-plated, mounting pad for anode 1 cm .
Device mounted on a ceramic PCB, Al
2
O
3
, standard footprint.
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
2.
FR4 PCB, mounting pad for anode 1 cm
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
TL431_FAM
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 6 — 9 January 2019
5 / 19
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