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TL431BW5-7

Public Made by Adom

by adom

Diodes Incorporated Voltage Reference, SOT-25. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TL431BW5-7

Diodes Incorporated · Voltage Reference · SOT-25

TL431BW5-7 from Diodes Incorporated, in a SOT-25. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 NC unconnected No connect pin, labelled NC on the SOT25 pin assignment drawing.
2 NC unconnected Not labelled by function; the datasheet says to leave it floating or connect it to pin 5 (ANODE).
3 CATHODE passive Cathode of the shunt regulator, rated 40V maximum (VKA) and 150mA continuous (IKA), with 1mA to 100mA recommended operating sink current.
4 REF input Reference input that sets the output voltage via an external divider (VREF 2.495V typ), with input current rated -0.050 to +10mA.
5 ANODE power_in Anode of the shunt regulator, the ground reference for all specified voltages.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-25
Category Power Management (PMIC)
Pins 5

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Reference voltage (TL431B, ±0.5%) VREF 2.482 2.495 2.507 V VKA = VREF, IKA = 10mA, TA = 25°C 3
Deviation of reference voltage over temperature, 0 to 70°C VDEV 6 16 mV VKA = VREF, IKA = 10mA, TA = 0 to 70°C 3
Deviation of reference voltage over temperature, -40 to +85°C VDEV 14 34 mV VKA = VREF, IKA = 10mA, TA = -40 to +85°C 3
Deviation of reference voltage over temperature, -40 to +125°C VDEV 14 34 mV VKA = VREF, IKA = 10mA, TA = -40 to +125°C 3
Ratio of change in reference voltage to change in cathode voltage (10V to VREF) ΔVREF/ΔVKA -1.4 -2.7 mV/V IKA = 10mA, VKA = 10V to VREF 3
Ratio of change in reference voltage to change in cathode voltage (36V to 10V) ΔVREF/ΔVKA -1 -2 mV/V IKA = 10mA, VKA = 36V to 10V 3
Reference input current IREF 1 4 µA IKA = 10mA, R1 = 10KΩ, R2 = ∞ 3
IREF deviation over temperature, 0 to 70°C ΔIREF 0.8 1.2 µA IKA = 10mA, R1 = 10KΩ, R2 = ∞, TA = 0 to 70°C 3
IREF deviation over temperature, -40 to +85°C ΔIREF 0.8 2.5 µA IKA = 10mA, R1 = 10KΩ, R2 = ∞, TA = -40 to +85°C 3
IREF deviation over temperature, -40 to +125°C ΔIREF 0.8 2.5 µA IKA = 10mA, R1 = 10KΩ, R2 = ∞, TA = -40 to +125°C 3
Minimum cathode current for regulation IKA(MIN) 0.4 0.7 mA VKA = VREF 3
Off-state current IKA(OFF) 0.05 0.5 µA VKA = 36V, VREF = 0V 3
Dynamic output impedance /ZKA/ 0.2 0.5 Ω VKA = VREF, f = 0Hz 3
Reference voltage tolerance at 25°C, grade B (±0.5%) VREF -0.5 0.5 % TL431B grade, TA = 25°C, per Features and Ordering 1
Thermal resistance junction to ambient, SOT25 θJA 250 °C/W SOT25 package 3
Cathode voltage VKA 36 V Minimum printed as VREF (not numeric) 2
Cathode current IKA 1 100 mA 2
Operating ambient temperature TA -40 125 °C 2
Cathode voltage VKA 40 V Voltages relative to ANODE pin 2
Continuous cathode current IKA 150 mA 2
Reference input current IREF -0.05 10 mA 2
Operating junction temperature TJ 150 °C 2
Storage temperature TST -55 150 °C 2
Power dissipation PD 500 mW SOT25; ambient 25°C (Notes 5, 6) 2

CAD (KiCad official)

  • Symbol: TL431BW5-7
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-25 (KiCad packages3D, STEP)
  • 3D model files: tl431bw5-7-etched.step / tl431bw5-7-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431bw5-7.step / tl431bw5-7.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Diodes Incorporated datasheet (14 pp, sha256 8ce0c11446beda6f, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF