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1. Product profile
1.1 General description
Three-terminal shu nt regulator fa mily with an output vo lt age range b etween V ref and 36 V,
to be set by two external resistors.
•The TL431xDBZR types feature an enhanced stability area with a very low
load capacity require ment.
•The TL431xFDT types offer an enhanced stability area and a higher
ElectroMagnetic Interference (EMI) ruggedn ess, for example, for Switch Mode Power
Supply (SMPS) applications.
•The TL431xSDT types are designed for standard requirements and linear
applications.
TL431 family
Adjustable precision shunt regulator
Rev. 5 — 01 September 2015 Product data sheet
SOT23
Table 1. Product overview
Reference
volt age
tolerance (Vref)
Temperature range (Tamb)Pinning
configuration
(see Table 3)
0C to 70 C40 C to 85 C40 C to 125 C
2 % TL431CDBZR TL431IDBZR TL431QDBZR normal pinning
TL431FDT normal pinning
TL431MFDT mirrored pinning
TL431SDT normal pinning
TL431MSDT mirrored pinning
1 % TL431ACDBZR TL431AIDBZR TL431AQDBZR normal pinning
TL431AFDT normal pinning
TL431AMFDT mirrored pinning
TL431ASDT normal pinning
TL431AMSDT mirrored pinning
0.5 % TL431BCDBZR TL431BIDBZR TL431BQDBZR normal pinning
TL431BFDT normal pinning
TL431BMFDT mirrored pinning
TL431BSDT normal pinning
TL431BMSDT mirrored pinning
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 2 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
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: 6 mV (in a range of 0 C up to 70 C)
Low output nois e
Typical output impedance: 0.2
Sink current capability: 1 mA to 100 mA
AEC-Q100 qualified (grade 1)
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 Conditions Min Typ Max Unit
VKA cathode-anode voltage Vref -36V
IKcathode current 1 - 100 mA
Vref reference voltage VKA =V
ref;
IK=10mA;
Tamb =25C
Standard-Grade (2 %) 2440 2495 2550 mV
A-Grade (1 %) 2470 2495 2520 mV
B-Grade (0.5 %) 2483 2495 2507 mV
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 3 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
2. Pinning information
Table 3. Pinning
Pin Symbol Description Simplified outline Graphic symbol
Normal pinning: All types wit ho ut MFDT and MSDT ending
1 k cathode
2 REF reference
3 a anode
Mirrored pinning: All types with MFDT an d MSDT ending
1 REF reference
2 k cathode
3 a anode
12
3
006aab355
REF
ak
12
3
006aab355
REF
ak
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 4 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
3. Ordering information
Table 4. Ordering info rmation
Type number Package
Name Description Version
TL431CDBZR - plastic surface-mounted package; 3 leads SOT23
TL431IDBZR
TL431QDBZR
TL431FDT
TL431MFDT
TL431SDT
TL431MSDT
TL431ACDBZR
TL431AIDBZR
TL431AQDBZR
TL431AFDT
TL431AMFDT
TL431ASDT
TL431AMSDT
TL431BCDBZR
TL431BIDBZR
TL431BQDBZR
TL431BFDT
TL431BMFDT
TL431BSDT
TL431BMSDT
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 5 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
4. Marking
[1] * = placeholder for manufacturing site code.
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 may be set to any value between Vref (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 circ u itry pro vid es a ve ry sh ar p tur n -o n ch ar ac ter i st ic ,
making these devices excellent replacements fo r Zener diodes in many applications like
on-board regulation, adjustable power supplies and switching power supplies.
Table 5. Marking codes
Type number Marking code[1] Type number Marking co de[1]
TL431CDBZR CA* TL431ASDT RL*
TL431IDBZR CB* TL431AMSDT LQ*
TL431QDBZR CC* TL431BCDBZR CG*
TL431FDT AR* TL431BIDBZR CH*
TL431MFDT AU* TL431BQDBZR CJ*
TL431SDT RM* TL431BFDT AT*
TL431MSDT LR* TL431BMFDT AW*
TL431ACDBZR CD* TL431BSDT MA*
TL431AIDBZR CE* TL431BMSDT MB*
TL431AQDBZR CF* - -
TL431AFDT AS* - -
TL431AMFDT AV* - -
Fig 1. Functional diagram
Vref
ANODE
CATHODE
REF
006aab569
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 6 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
6. Limiting values
[1] 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 cm2.
[3] Device mounted on a ceramic PCB, Al2O3, standard footprint.
Table 6. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter Conditions Min Max Unit
VKA cathode-anode voltage - 37 V
IKcathode current 100 150 mA
Iref reference current 0.05 10 mA
Ptot total power dissipation Tamb 25 C[1] -350mW
[2] -580mW
[3] -950mW
Tjjunction temperature - 150 C
Tamb ambient temperature
TL431XCDBZR 0 +70 C
TL431XIDBZR 40 +85 C
TL431XQDBZR
TL431XFDT
TL431XSDT
40 +125 C
Tstg storage temperature 65 +150 C
(1) Ceramic PCB, Al2O3, standard footprint
(2) FR4 PCB, mounting pad for anode 1 cm2
(3) FR4 PCB, standard footprint
Fig 2. Power derating curves
Tamb (°C)
−75 17512525 75−25
006aab570
500
750
250
1000
1250
Ptot
(mW)
0
(1)
(2)
(3)
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 7 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
7. Recommended operating conditions
8. Thermal characteristics
[1] Device mounted on an FR4 PCB, single- si ded copper, tin-plated and standard footprint.
[2] Device mounted on an FR4 PCB, single-sided copper, tin-plated, mounting pad for anode 1 cm2.
[3] Device mounted on a ceramic PCB, Al2O3, standard footprint.
[4] Soldering point of anode.
Table 7. ESD maximum ratings
Tamb =25
C unless otherwise specified.
Symbol Parameter Conditions Min Max Unit
VESD electrostatic discharge voltage MIL-STD-883
(human body model) -4kV
Table 8. Operating conditio ns
Symbol Parameter Conditions Min Max Unit
VKA cathode-anode voltage Vref 36 V
IKcathode current 1 100 mA
Table 9. Thermal characteris tics
Symbol Parameter Conditions Min Typ Max Unit
Rth(j-a) thermal resistance from
junction to ambient in free air [1] --360K/W
[2] --216K/W
[3] --132K/W
Rth(j-sp) thermal resistance from
junction to solder point [4] --50K/W
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 8 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
9. Characteristics
Table 10. Chara cteristics
Tamb =25
C unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Standard-Grade (2 %):
TL431CDBZR; TL431IDBZR; TL431QDBZR; TL431FD T; TL43 1MFDT; TL431SDT; TL431MSDT
Vref reference voltage VKA =V
ref; IK= 10 mA 2440 2495 2550 mV
Vref reference voltage variation VKA =V
ref; IK=10mA
TL431CDBZR Tamb =0Cto70C-616mV
TL431IDBZR Tamb =40 Cto85C - 14 34 mV
TL431QDBZR
TL431FDT
TL431MFDT
TL431SDT
TL431MSDT
Tamb =40 C to 125 C
Vref/VKA reference voltage variation
to cathode-anode voltage
variation ratio
IK=10mA
VKA =10VtoV
ref -1.4 2.7 mV/V
VKA =36Vto10V - 12mV/V
Iref reference current IK=10mA;
R1 = 10 k; R2 = open -24A
Iref reference current variation IK=10mA;
R1 = 10 k; R2 = open
TL431CDBZR Tamb =0Cto70C-0.41.2A
TL431IDBZR Tamb =40 Cto85C- 0.82.5A
TL431QDBZR
TL431FDT
TL431MFDT
TL431SDT
TL431MSDT
Tamb =40 C to 125 C
IK(min) minimum cathode current VKA =V
ref -0.41mA
Ioff off-state current VKA =36V; V
ref =0 - 0.1 1 A
ZKA dynamic cathode-anode
impedance IK=1mAto100mA;
VKA =V
ref; f < 1 kHz -0.20.5
A-Grade(1%):
TL431ACDBZR; TL431AIDBZR; TL431AQDBZR; TL431AFDT; TL431AMFDT; TL431ASDT; TL431AMSDT
Vref reference voltage VKA =V
ref; IK= 10 mA 2470 2495 2520 mV
Vref reference voltage variation VKA =V
ref; IK=10mA
TL431ACDBZR Tamb =0Cto70C-616mV
TL431AIDBZR Tamb =40 Cto85C - 14 34 mV
TL431AQDBZR
TL431AFDT
TL431AMFDT
TL431ASDT
TL431AMSDT
Tamb =40 C to 125 C
Vref/VKA reference voltage variation
to cathode-anode voltage
variation ratio
IK=10mA
VKA =10VtoV
ref -1.4 2.7 mV/V
VKA =36Vto10V - 12mV/V
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 9 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
Iref reference current IK=10mA;
R1 = 10 k; R2 = open -24A
Iref reference current variation IK=10mA;
R1 = 10 k; R2 = open
TL431ACDBZR Tamb =0Cto70C-0.41.2A
TL431AIDBZR Tamb =40 Cto85C- 0.82.5A
TL431AQDBZR
TL431AFDT
TL431AMFDT
TL431ASDT
TL431AMSDT
Tamb =40 C to 125 C
IK(min) minimum cathode current VKA =V
ref
TL431ACDBZR Tamb =0Cto70C-0.40.6mA
TL431AIDBZR Tamb =40 Cto85C
TL431AQDBZR
TL431AFDT
TL431AMFDT
TL431ASDT
TL431AMSDT
Tamb =40 C to 125 C
Ioff off-state current VKA =36V; V
ref =0 - 0.1 0.5 A
ZKA dynamic cathode-anode
impedance IK=1mAto100mA;
VKA =V
ref; f < 1 kHz -0.20.5
B-Grade(0.5%):
TL431BCDBZR; TL431BIDBZR; TL431BQDBZR; TL431BFDT; TL431BMFDT; TL431BSDT; TL431BMSDT
Vref reference voltage VKA =V
ref; IK= 10 mA 2483 2495 2507 mV
Vref reference voltage variation VKA =V
ref; IK=10mA
TL431BCDBZR Tamb =0Cto70C-616mV
TL431BIDBZR Tamb =40 Cto85C - 14 34 mV
TL431BQDBZR
TL431BFDT
TL431BMFDT
TL431BSDT
TL431BMSDT
Tamb =40 C to 125 C
Vref/VKA reference voltage variation
to cathode-anode voltage
variation ratio
IK=10mA
VKA =10VtoV
ref -1.4 2.7 mV/V
VKA =36Vto10V - 12mV/V
Iref reference current IK=10mA;
R1 = 10 k; R2 = open -24A
Table 10. Chara cteristics …continued
Tamb =25
C unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 10 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
Iref reference current variation IK=10mA;
R1 = 10 k; R2 = open
TL431BCDBZR Tamb =0Cto70C-0.41.2A
TL431BIDBZR Tamb =40 Cto85C- 0.82.5A
TL431BQDBZR
TL431BFDT
TL431BMFDT
TL431BSDT
TL431BMSDT
Tamb =40 C to 125 C
IK(min) minimum cathode current VKA =V
ref
TL431BCDBZR Tamb =0Cto70C-0.40.6mA
TL431BIDBZR Tamb =40 Cto85C
TL431BQDBZR
TL431BFDT
TL431BMFDT
TL431BSDT
TL431BMSDT
Tamb =40 C to 125 C
Ioff off-state current VKA =36V; V
ref =0 - 0.1 0.5 A
ZKA dynamic cathode-anode
impedance IK=1mAto100mA;
VKA =V
ref; f < 1 kHz -0.20.5
Table 10. Chara cteristics …continued
Tamb =25
C unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 11 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
IK=10mA; V
KA =V
ref VKA =V
ref; Tamb =25C
Fig 3. Reference voltage as a function of ambient
temperature; typical values Fig 4. Cathode current as a function of
cathode-an ode voltage; typical values
IK=10mA; V
KA =V
ref
Fig 5. Test circuit to Figure 3 and Figure 4
Tamb (°C)
−75 12575−25 25
006aab571
2.48
2.52
2.44
2.56
2.60
Vref
(V)
2.40
VKA (V)
−23201−1
006aab572
0
50
−50
100
150
IK
(mA)
−100
006aab573
GND
Vref
VKA
INPUT
IK
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 12 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
IK=10mA; R1=10k; R2 = open IK=10mA; T
amb =25C
Fig 6. Re ference current as a function of ambient
temperature; typical values Fig 7. Reference voltage variation as a function of
cathode-an ode voltage; typical values
Fig 8. Test circuit to Figure 6 and Figure 7
Tamb (°C)
−75 12575−25 25
006aab574
2.0
3.0
1.0
4.0
5.0
Iref
(μA)
0.0
VKA (V)
0403010 20
006aab575
−40
−20
0
ΔVref
(mV)
−60
006aab576
GND
Vref
VKA
INPUT
IK
Iref
R1
R2
VKA Vref 1R1
R2
-------
+


Iref R1+=
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 13 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
VKA =36V; V
ref =0V
Fig 9. Off-state current as a function of ambient temperature; typical values
VKA =36V; V
ref =0V
Fig 10. Off-state current as a function of ambient temperature; test circuit
006aab578
GND
VKA
INPUT
Ioff
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 14 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
Tamb =25C
(1) Input
(2) Output
Tamb =25C
(1) Input
(2) Output
Fig 11. All types except TL431XFDT and TL431XSDT:
Input voltage and output voltage as a function
of time; typical values
Fig 12. TL431XFDT:
Input voltage and output v oltage as a function
of time; typical values
Tamb =25C
(1) Input
(2) Output
Tamb =25C
Fig 13. TL4 31 XSDT:
Input voltage and output voltage as a function
of time; typical values
Fig 14. Test circuit to Figure 11, Figure 12 and
Figure 13
t (μs)
−17513
006aab579
2
4
6
Vin; Vout
(V)
0
(1)
(2)
t (μs)
−17513
006aac478
2
4
6
Vin; Vout
(V)
0
(1)
(2)
t (μs)
−17513
006aab580
2
4
6
Vin; Vout
(V)
0
(1)
(2)
006aab581
GND
VKA
220 Ω
50 Ω
PULSE
GENERATOR
f = 100 kHz
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 15 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
IK=10mA; T
amb =25CI
K=10mA; T
amb =25C
Fig 15. All types except TL431XFDT and TL431XSDT:
Voltage amplification as a function of
frequency; typical values
Fig 16. TL431XFDT:
Voltage amplification as a function of
frequency; typical values
IK=10mA; T
amb =25CI
K=10mA; T
amb =25C
Fig 17. TL4 31 XSDT:
Voltage amplification as a function of
frequency; typical values
Fig 18. Test circuit to Figure 15, Figure 16 and
Figure 17
006aab583
20
40
60
Av
(dB)
0
f (kHz)
110
4
103
10 102
006aac479
20
40
60
Av
(dB)
0
f (kHz)
110
4
103
10 102
006aab582
20
40
60
Av
(dB)
0
f (kHz)
110
4
103
10 102
aaa-017869
GND
VKA
IK232 Ω15 kΩ
8.25 kΩ
9 μF
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 16 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
IK=10mA; T
amb =25CI
K=10mA; T
amb =25C
Fig 19. All types except TL431XFDT and TL431XSDT:
Dynamic cathode-anode impedance as a
function of freq uency; typical values
Fig 20. TL431XFDT:
Dynamic cathode-anode impedance as a
function of frequency; typical values
IK=10mA; T
amb =25CI
K=10mA; T
amb =25C
Fig 21. TL4 31 XSDT:
Dynamic cathode-anode impedance as a
function of freq uency; typical values
Fig 22. Test circuit to Figure 19, Figure 20 and
Figure 21
006aab585
10
1
102
ZKA
(Ω)
10−1
f (kHz)
110
4
103
10 102
006aac480
10
1
102
ZKA
(Ω)
10−1
f (kHz)
110
4
103
10 102
006aab586
10
1
102
ZKA
(Ω)
10−1
f (kHz)
110
4
103
10 102
006aab587
GND
V
KA
I
K
50 Ω
1 kΩ
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 17 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
Tamb =25C
(1) VKA =V
ref
VKA = 5 V: no oscillation
VKA = 10 V: no oscillation
VKA = 15 V: no oscillation
Fig 23. All types except TL431XFDT and TL431XSDT:
Cathode current as a function of load capacitance; typical values
VKA =V
ref
Tamb =25CVKA > 5 V: stable operation
Tamb =25C
Fig 24. Test circuit (1) to Figure 23 Fig 25. Test circuit (2) to Figure 23
006aab588
40
60
20
80
100
I
K
(mA)
0
C
L
(nF)
1 10
4
10
3
10 10
2
Stable Oscillation Stable
(1) (1)
006aab589
GND
CL
I
K
150 Ω
VBATT
006aab590
GND
CL
IK150 Ω
VBATT
R2
R1 = 10 kΩ
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 18 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
Tamb =25C
(1) VKA =V
ref
VKA = 5 V: no oscillation
VKA = 10 V: no oscillation
VKA = 15 V: no oscillation
Fig 26. TL431XFDT: Ca thode current as a functio n of load capacitance; ty pical valu es
VKA =V
ref
Tamb =25CVKA > 5 V: stable operation
Tamb =25C
Fig 27. Test circuit (1) to Figure 26 Fig 28. Test circuit (2) to Figure 26
006aac481
40
60
20
80
100
I
K
(mA)
0
10
−1
C
L
(nF)
10
3
10
4
10
2
110
Stable Oscillation Stable
(1) (1)
006aab589
GND
CL
I
K
150 Ω
VBATT
006aab590
GND
CL
IK150 Ω
VBATT
R2
R1 = 10 kΩ
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 19 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
Tamb =25C
(1) VKA =V
ref
(2) VKA =5V
VKA = 10 V: no oscillation
VKA = 15 V: no oscillation
Fig 29. TL431XSDT: Cathode current as a function of load capacitance; typical values
VKA =V
ref
Tamb =25CVKA =5V
VKA > 10 V: stable operation
Tamb =25C
Fig 30. Test circuit (1) to Figure 29 Fig 31. Test circuit (2) to Figure 29
006aab591
40
60
20
80
100
I
K
(mA)
0
10
−1
C
L
(nF)
10
3
10
4
10
2
110
Stable Oscillation Stable
(2) (2)
(1) (1)
006aab589
GND
CL
I
K
150 Ω
VBATT
006aab590
GND
CL
IK150 Ω
VBATT
R2
R1 = 10 kΩ
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 20 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
10. Application information
Fig 32. Shunt regul a tor
Fig 33. Series pass regulator
Fig 34. Single-supply comp arator with temperature-compensated threshold
006aab592
V
OUT
R1
R2
V+
VOUT 1R1
R2
-------
+


Vref
=
006aab593
VOUT
R1
R2
V+
VOUT 1R1
R2
-------
+


Vref
=
VOUT min Vref Vbe
+=
006aab594
VOUT
V+
VIN
Vth Vref
=
VIN Vref VOUT 0
VIN Vref VOUT 2V
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 21 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
Fig 35. Constant current source
Fig 36. High-c u rre nt sh un t regu la tor
Fig 37. Constant current sink
006aab595
I
OUT
RCL
V+
IOUT Vref
RCL
---------
=
006aab596
VOUT
R1
R2
V+
VOUT 1R1
R2
-------
+


Vref
=
006aab597
ISINK
RS
V+
ISINK Vref
RS
---------
=
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 22 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
11. Test information
11.1 Quality information
This product has been qualified in accordance with the Automotive Electronics Council
(AEC) standard Q100 - Failure mechanism based stress test qualification for integrated
circuits, and is suitable for use in automotive applications.
12. Package outline
Fig 38. TL4 31 in co ntrol loop of SMPS
006aac482
VOUT
R1
R2
GND
R3
REF
GND
REGULATOR LINE
Fig 39. Package outline SOT23 (TO-236AB)
04-11-04Dimensions in mm
0.45
0.15
1.9
1.1
0.9
3.0
2.8
2.5
2.1 1.4
1.2
0.48
0.38 0.15
0.09
12
3
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 23 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
13. Soldering
Fig 40. Reflow soldering footprint SOT23 (TO-236AB)
Fig 41. Wave soldering footprint SOT23 (TO-236AB)
solder lands
solder resist
occupied area
solder paste
sot023_fr
0.5
(3×)
0.6
(3×)
0.6
(3×)
0.7
(3×)
3
1
3.3
2.9
1.7
1.9
2
Dimensions in mm
solder lands
solder resist
occupied area
preferred transport direction during soldering
sot023_fw
2.8
4.5
1.4
4.6
1.4
(2×)
1.2
(2×)
2.2
2.6
Dimensions in mm
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 24 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
14. Revision history
Table 11. Revision history
Document ID Release date Data sheet status Change notice Supersedes
TL431_FAM v.5 20150901 Product data sheet - TL431_FAM v.4
Modifications: •Figure 18: Capacitor value corrected
TL431_FAM v.4 20110630 Product data sheet - TL431_FAM v.3
TL431_FAM v.3 20101105 Product data sheet - TL431_FAM v.2
TL431_FAM v.2 20100120 Product data sheet - TL431_FAM v.1
TL431_FAM v.1 20090806 Product data sheet - -
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 25 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
15. Legal information
15.1 Data sheet status
[1] Please consult the most recently issued document before initiating or completing a design.
[2] The term ‘short data sheet’ is explained in section “Definitions”.
[3] The product status of de vice(s) descr ibed in th is document m ay have cha nged since thi s document w as publish ed and may di ffe r in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
15.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liab ility for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and tit le. A short data sh eet is intended
for quick reference only and shou ld not b e relied u pon to cont ain det ailed and
full information. For detailed and full informatio n see the relevant full dat a
sheet, which is available on request via the local NXP Semicond uctors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall pre va il.
Product specificat io n — The information and data provided in a Product
data sheet shall define the specification of the product as agreed between
NXP Semiconductors and its customer, unless NXP Semiconductors and
customer have explicitly agreed otherwise in writing. In no event however,
shall an agreement be valid in which the NXP Semiconductors product is
deemed to off er functions and qualities beyon d those described in the
Product data sheet.
15.3 Disclaimers
Limited warr a nty and liability — Information in this document is believed to
be accurate and reliable. However, NXP Semiconductors does not give any
representations or warrant ies, expressed or implied, as to the accuracy or
completeness of such information and shall have no liability for the
consequences of use of such information. NXP Se miconductors takes no
responsibility for the content in this document if provided by an information
source outside of NXP Semiconductors.
In no event shall NXP Semiconductors be liable for any indirect , incidental,
punitive, special or consequ ential damages (including - wit hout limitation - lost
profits, lost savings, business interruption, costs related to the removal or
replacement of any products or rework charges) whether or not such
damages are based on tort (including negligence), warranty, breach of
contract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, NXP Semiconductors’ ag gregate and cumulative l iability towards
customer for the products described herein shall be limited in accordance
with the Terms and conditions of commercial sale of NXP Semiconductors.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all informa tion supplied prior
to the publication hereof .
Suitability for use in automotive applications — This NXP
Semiconductors product has been qualified for use in automotive
applications. Unless otherwise agreed in writing, t he product is not designed,
authorized or warranted to be suitable for use in life support, life-critical or
safety-critical systems or equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in perso nal injury, death or severe property or environmental
damage. NXP Semiconductors and its suppliers accept no liability for
inclusion and/or use of NXP Semiconducto rs products in such equipment or
applications and t her efo re su ch inclu si on a nd/or use is at the cu stome r's own
risk.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and ope ration of their applications
and products using NXP Semiconductors product s, and NXP Semiconductors
accepts no liability for any assistance with applications or customer product
design. It is customer’s sole responsibility to determine whether the NXP
Semiconductors product is suit able and fit for t he customer’s applications and
products planned, as well as fo r the planned application and use of
customer’s third party customer(s). Custo mers should provide appropriate
design and operating safeguards to minimize the risks associated with their
applications and products.
NXP Semiconductors does not accept any liability related to any default,
damage, costs or problem which is based on any weakness or default in the
customer’s applications or products, or the application or use by customer’s
third party custo mer(s). Customer is responsible for doing all necessary
testing for the customer’s applications and pro ducts using NXP
Semiconductors products in order to avoid a default of the applications and
the products or of the application or use by cust omer’s third party
customer(s). NXP does not accept any liability in this respect.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial sale — NXP Semiconductors
products are sold subject to the general terms and conditions of commercial
sale, as published at http://www.nxp.com/profile/terms, unless otherwise
agreed in a valid written individua l agreement. In case an individual
agreement is concluded only the terms and conditions of the respective
agreement shall apply. NXP Semiconductors hereby expressly objects to
applying the customer’s general terms and conditions with regard to the
purchase of NXP Semiconductors products by customer.
Document status[1][2] Product status[3] Definition
Objective [short] data sheet Development This document contain s data from the objective specification for product development .
Preliminary [short] dat a sheet Qualification This document contains data from the preliminary specificat ion.
Product [short] data sheet Production This document contains the product specification.
TL431 family All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 5 — 01 September 2015 26 of 27
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
No offer to sell or license — Nothing in this document may be interpret ed or
construed as an of fer to se ll product s that is op en for accept ance or the grant ,
conveyance or implication of any license under any copyrights, patents or
other industrial or intellectual property rights.
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from competent authorities.
Quick reference data — The Quick reference data is an extract of the
product data given in the Limiting values and Characteristics sections of this
document, and as such is not complete, exhaustive or legally binding.
Translations — A non-English (translated) version of a document is for
reference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.
15.4 Trademarks
Notice: All referenced b rands, produc t names, service names and trademarks
are the property of their respective ow ners.
16. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
© NXP Semiconductors N.V. 2015. All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 01 September 2015
Document identifier: TL431 family
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
17. Contents
1 Product profile . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 General description . . . . . . . . . . . . . . . . . . . . . 1
1.2 Features and benefits. . . . . . . . . . . . . . . . . . . . 2
1.3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.4 Quick reference data . . . . . . . . . . . . . . . . . . . . 2
2 Pinning information. . . . . . . . . . . . . . . . . . . . . . 3
3 Ordering information. . . . . . . . . . . . . . . . . . . . . 4
4 Marking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 5
6 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 6
7 Recommended operating conditions. . . . . . . . 7
8 Thermal characteristics . . . . . . . . . . . . . . . . . . 7
9 Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . 8
10 Application information. . . . . . . . . . . . . . . . . . 20
11 Test information. . . . . . . . . . . . . . . . . . . . . . . . 22
11.1 Quality information . . . . . . . . . . . . . . . . . . . . . 22
12 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 22
13 Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
14 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 24
15 Legal information. . . . . . . . . . . . . . . . . . . . . . . 25
15.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 25
15.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
15.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 25
15.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 26
16 Contact information. . . . . . . . . . . . . . . . . . . . . 26
17 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27