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TL431AQDBZRNXPN/a450avaiAdjustable precision shunt regulator
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TL431BQDBZRNXPN/a2131avaiAdjustable precision shunt regulator
TL431AIDBZRNXPN/a120avaiAdjustable precision shunt regulator


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TL431AIDBZR-TL431AMFDT-TL431AMSDT-TL431AQDBZR-TL431BMFDT-TL431BQDBZR
Adjustable precision shunt regulator
1. General description
Three-terminal shunt regulator family with an output voltage range between Vref and 36V,
to be set by two external resistors. 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.
TL431 family
Adjustable precision shunt regulator
Rev. 4 — 30 June 2011 Product data sheet
Table 1. Product overview% TL431CDBZR TL431IDBZR TL431QDBZR normal pinning
TL431FDT normal pinning
TL431MFDT mirrored pinning
TL431SDT normal pinning
TL431MSDT mirrored pinning% 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
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
2. Features and benefits Programmable output voltage up to 36V 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 mAto 100 mA AEC-Q100 qualified (grade1)
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. Quick reference data
VKA cathode-anode voltage Vref -36 V cathode current 1 - 100 mA
Vref reference voltage VKA =Vref; =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
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
5. Ordering information Table 3. Ordering information
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
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
6. Marking
[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 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 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.
Table 4. Marking codes
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
8. Pinning information
9. 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 5. Pinning
Normal pinning: All types without MFDT and MSDT ending
Mirrored pinning: All types with MFDT and MSDT ending
Table 6. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
VKA cathode-anode voltage - 37 V cathode current 100 150 mA
Iref reference current 0.05 10 mA
Ptot total power dissipation Tamb25C [1] -350 mW
[2] -580 mW
[3] -950 mW junction 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
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
10. Recommended operating conditions
Table 7. ESD maximum ratings
Tamb =25 C unless otherwise specified.
VESD electrostatic discharge voltage MIL-STD-883
(human body model) kV
Table 8. Operating conditions
VKA cathode-anode voltage Vref 36 V cathode current 1 100 mA
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
11. Thermal characteristics
[1] Device mounted on an FR4 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.
[4] Soldering point of anode.
12. Characteristics
Table 9. Thermal characteristics
Rth(j-a) thermal resistance from
junction to ambient
in free air [1] -- 360 K/W
[2] -- 216 K/W
[3] -- 132 K/W
Rth(j-sp) thermal resistance from
junction to solder point
[4] -- 50 K/W
Table 10. Characteristics
Tamb =25 C unless otherwise specified.
Standard-Grade(2 %):
TL431CDBZR; TL431IDBZR; TL431QDBZR; TL431FDT; TL431MFDT; TL431SDT; TL431MSDT
Vref reference voltage VKA =Vref; IK=10 mA 2440 2495 2550 mV
Vref reference voltage variation VKA =Vref; IK =10mA
TL431CDBZR Tamb =0 Cto70 C- 6 16 mV
TL431IDBZR Tamb= 40 Cto85C - 14 34 mV
TL431QDBZR
TL431FDT
TL431MFDT
TL431SDT
TL431MSDT
Tamb= 40Cto 125C
Vref/VKA reference voltage variation
to cathode-anode voltage
variation ratio =10mA
VKA =10Vto Vref - 1.4 2.7 mV/V
VKA =36Vto10V - 1 2mV/V
Iref reference current IK =10mA; =10 k;R2= open 4 A
Iref reference current variation IK =10mA; =10 k;R2= open
TL431CDBZR Tamb =0 Cto70 C- 0.4 1.2 A
TL431IDBZR Tamb= 40 Cto85 C- 0.8 2.5 A
TL431QDBZR
TL431FDT
TL431MFDT
TL431SDT
TL431MSDT
Tamb= 40Cto 125C
IK(min) minimum cathode current VKA =Vref -0.4 1 mA
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
Ioff off-state current VKA =36 V; Vref =0 - 0.1 1 A
ZKA dynamic cathode-anode
impedance =1mA to100mA;
VKA =Vref; f<1 kHz
-0.2 0.5 
A-Grade(1%):
TL431ACDBZR; TL431AIDBZR; TL431AQDBZR; TL431AFDT; TL431AMFDT; TL431ASDT; TL431AMSDT
Vref reference voltage VKA =Vref; IK=10 mA 2470 2495 2520 mV
Vref reference voltage variation VKA =Vref; IK =10mA
TL431ACDBZR Tamb =0 Cto70 C- 6 16 mV
TL431AIDBZR Tamb= 40 Cto85C - 14 34 mV
TL431AQDBZR
TL431AFDT
TL431AMFDT
TL431ASDT
TL431AMSDT
Tamb= 40Cto 125C
Vref/VKA reference voltage variation
to cathode-anode voltage
variation ratio =10mA
VKA =10Vto Vref - 1.4 2.7 mV/V
VKA =36Vto10V - 1 2mV/V
Iref reference current IK =10mA; =10 k;R2= open 4 A
Iref reference current variation IK =10mA; =10 k;R2= open
TL431ACDBZR Tamb =0 Cto70 C- 0.4 1.2 A
TL431AIDBZR Tamb= 40 Cto85 C- 0.8 2.5 A
TL431AQDBZR
TL431AFDT
TL431AMFDT
TL431ASDT
TL431AMSDT
Tamb= 40Cto 125C
IK(min) minimum cathode current VKA =Vref
TL431ACDBZR Tamb =0 Cto70 C- 0.4 0.6 mA
TL431AIDBZR Tamb= 40 Cto85C
TL431AQDBZR
TL431AFDT
TL431AMFDT
TL431ASDT
TL431AMSDT
Tamb= 40Cto 125C
Ioff off-state current VKA =36 V; Vref =0 - 0.1 0.5 A
ZKA dynamic cathode-anode
impedance =1mA to100mA;
VKA =Vref; f<1 kHz
-0.2 0.5 
Table 10. Characteristics …continued
Tamb =25 C unless otherwise specified.
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
B-Grade(0.5%):
TL431BCDBZR; TL431BIDBZR; TL431BQDBZR; TL431BFDT; TL431BMFDT; TL431BSDT; TL431BMSDT
Vref reference voltage VKA =Vref; IK=10 mA 2483 2495 2507 mV
Vref reference voltage variation VKA =Vref; IK =10mA
TL431BCDBZR Tamb =0 Cto70 C- 6 16 mV
TL431BIDBZR Tamb= 40 Cto85C - 14 34 mV
TL431BQDBZR
TL431BFDT
TL431BMFDT
TL431BSDT
TL431BMSDT
Tamb= 40Cto 125C
Vref/VKA reference voltage variation
to cathode-anode voltage
variation ratio =10mA
VKA =10Vto Vref - 1.4 2.7 mV/V
VKA =36Vto10V - 1 2mV/V
Iref reference current IK =10mA; =10 k;R2= open 4 A
Iref reference current variation IK =10mA; =10 k;R2= open
TL431BCDBZR Tamb =0 Cto70 C- 0.4 1.2 A
TL431BIDBZR Tamb= 40 Cto85 C- 0.8 2.5 A
TL431BQDBZR
TL431BFDT
TL431BMFDT
TL431BSDT
TL431BMSDT
Tamb= 40Cto 125C
IK(min) minimum cathode current VKA =Vref
TL431BCDBZR Tamb =0 Cto70 C- 0.4 0.6 mA
TL431BIDBZR Tamb= 40 Cto85C
TL431BQDBZR
TL431BFDT
TL431BMFDT
TL431BSDT
TL431BMSDT
Tamb= 40Cto 125C
Ioff off-state current VKA =36 V; Vref =0 - 0.1 0.5 A
ZKA dynamic cathode-anode
impedance =1mA to100mA;
VKA =Vref; f<1 kHz
-0.2 0.5 
Table 10. Characteristics …continued
Tamb =25 C unless otherwise specified.
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
NXP Semiconductors TL431 family
Adjustable precision shunt regulator
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