TL431AQDBZR,215 - NXP SEMICONDUCTORS

Important notice

Dear Customer,

On 7 February 2017 the former NXP Standard Product business became a new company with the

tradename Nexperia. Nexperia is an industry leading supplier of Discrete, Logic and PowerMOS

semiconductors with its focus on the automotive, industrial, computing, consumer and wearable

application markets

In data sheets and application notes which still contain NXP or Philips Semiconductors references, use

the references to Nexperia, as shown below.

Instead of http://www.nxp.com, http://www.philips.com/ or http://www.semiconductors.philips.com/,

use http://www.nexperia.com

Instead of sales.addresses@www.nxp.com or sales.addresses@www.semiconductors.philips.com, use

salesaddresses@nexperia.com (email)

Replace the copyright notice at the bottom of each page or elsewhere in the document, depending on

the version, as shown below:

reserved

Should be replaced with:

If you have any questions related to the data sheet, please contact our nearest sales office via e-mail

or telephone (details via salesaddresses@nexperia.com). Thank you for your cooperation and

understanding,

Kind regards,

Team Nexperia

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 C40 C to 85 C40 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

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 =25C

Standard-Grade (2 %) 2440 2495 2550 mV

A-Grade (1 %) 2470 2495 2520 mV

B-Grade (0.5 %) 2483 2495 2507 mV

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

006aab355

REF

006aab355

REF

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

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

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)

(1)

(2)

(3)

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

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 =0Cto70C-616mV

TL431IDBZR Tamb =40 Cto85C - 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 - 12mV/V

Iref reference current IK=10mA;

R1 = 10 k; R2 = open -24A

Iref reference current variation IK=10mA;

R1 = 10 k; R2 = open

TL431CDBZR Tamb =0Cto70C-0.41.2A

TL431IDBZR Tamb =40 Cto85C- 0.82.5A

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 =0Cto70C-616mV

TL431AIDBZR Tamb =40 Cto85C - 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 - 12mV/V

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 -24A

Iref reference current variation IK=10mA;

R1 = 10 k; R2 = open

TL431ACDBZR Tamb =0Cto70C-0.41.2A

TL431AIDBZR Tamb =40 Cto85C- 0.82.5A

TL431AQDBZR

TL431AFDT

TL431AMFDT

TL431ASDT

TL431AMSDT

Tamb =40 C to 125 C

IK(min) minimum cathode current VKA =V

ref

TL431ACDBZR Tamb =0Cto70C-0.40.6mA

TL431AIDBZR Tamb =40 Cto85C

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 =0Cto70C-616mV

TL431BIDBZR Tamb =40 Cto85C - 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 - 12mV/V

Iref reference current IK=10mA;

R1 = 10 k; R2 = open -24A

Table 10. Chara cteristics …continued

Tamb =25



C unless otherwise specified.

Symbol Parameter Conditions Min Typ Max Unit

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 =0Cto70C-0.41.2A

TL431BIDBZR Tamb =40 Cto85C- 0.82.5A

TL431BQDBZR

TL431BFDT

TL431BMFDT

TL431BSDT

TL431BMSDT

Tamb =40 C to 125 C

IK(min) minimum cathode current VKA =V

ref

TL431BCDBZR Tamb =0Cto70C-0.40.6mA

TL431BIDBZR Tamb =40 Cto85C

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

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 =25C

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

−50

100

150

(mA)

−100

006aab573

GND

Vref

VKA

INPUT

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 =25C

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

ΔVref

(mV)

−60

006aab576

GND

Vref

VKA

INPUT

Iref

VKA Vref 1R1

-------





Iref R1+=

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

Tamb (°C)

−75 12575−25 25

006aab577

100

150

200

250

Ioff

(nA)

006aab578

GND

VKA

INPUT

Ioff

Product data sheet Rev. 5 — 01 September 2015 14 of 27

NXP Semiconductors TL431 family

Adjustable precision shunt regulator

Tamb =25C

(1) Input

(2) Output

Tamb =25C

(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 =25C

(1) Input

(2) Output

Tamb =25C

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

Vin; Vout

(V)

(1)

(2)

t (μs)

−17513

006aac478

Vin; Vout

(V)

(1)

(2)

t (μs)

−17513

006aab580

Vin; Vout

(V)

(1)

(2)

006aab581

GND

VKA

220 Ω

50 Ω

PULSE

GENERATOR

f = 100 kHz

Product data sheet Rev. 5 — 01 September 2015 15 of 27

NXP Semiconductors TL431 family

Adjustable precision shunt regulator

IK=10mA; T

amb =25CI

K=10mA; T

amb =25C

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 =25CI

K=10mA; T

amb =25C

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

(dB)

f (kHz)

110

103

10 102

006aac479

(dB)

f (kHz)

110

103

10 102

006aab582

(dB)

f (kHz)

110

103

10 102

aaa-017869

GND

VKA

IK232 Ω15 kΩ

8.25 kΩ

9 μF

Product data sheet Rev. 5 — 01 September 2015 16 of 27

NXP Semiconductors TL431 family

Adjustable precision shunt regulator

IK=10mA; T

amb =25CI

K=10mA; T

amb =25C

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 =25CI

K=10mA; T

amb =25C

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

102

ZKA

(Ω)

10−1

f (kHz)

110

103

10 102

006aac480

102

ZKA

(Ω)

10−1

f (kHz)

110

103

10 102

006aab586

102

ZKA

(Ω)

10−1

f (kHz)

110

103

10 102

006aab587

GND

50 Ω

1 kΩ

Product data sheet Rev. 5 — 01 September 2015 17 of 27

NXP Semiconductors TL431 family

Adjustable precision shunt regulator

Tamb =25C

(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 =25CVKA > 5 V: stable operation

Tamb =25C

Fig 24. Test circuit (1) to Figure 23 Fig 25. Test circuit (2) to Figure 23

006aab588

100

(mA)

(nF)

1 10

10 10

Stable Oscillation Stable

(1) (1)

006aab589

GND

150 Ω

VBATT

006aab590

GND

IK150 Ω

VBATT

R1 = 10 kΩ

Product data sheet Rev. 5 — 01 September 2015 18 of 27

NXP Semiconductors TL431 family

Adjustable precision shunt regulator

Tamb =25C

(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 =25CVKA > 5 V: stable operation

Tamb =25C

Fig 27. Test circuit (1) to Figure 26 Fig 28. Test circuit (2) to Figure 26

006aac481

100

(mA)

−1

(nF)

110

Stable Oscillation Stable

(1) (1)

006aab589

GND

150 Ω

VBATT

006aab590

GND

IK150 Ω

VBATT

R1 = 10 kΩ