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TL431BQD

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Texas Instruments Voltage References, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentpower management icstl431bqdfactory-2.0.0extractor-text

Verified TL431BQD

by Ray · last 31 Oct 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

31 Oct 2026RayPublished by the parts factory: tier mfr, 8 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: TL431BQD · SOIC-8 · 8 pins
  • ✓copper: 8 copper pads, none touching another net
  • ✓datasheet: all 8 pin names found in the 85-page datasheet
  • ✓distributor: lcsc C1575400, digikey 2156-TL431BQD-ND, mouser 595-TL431BQD
  • ✓family: SOIC-8_3.9x4.9mm_P1.27mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-8fi90fm7/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • ✓package_fit: height and body within the datasheet's package drawing (datasheet p.67)
  • ✓pads: 8 pins = 8 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 8 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ tl431bqd.kicad_sym✓ tl431bqd.kicad_mod✓ tl431bqd.step
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Contents

README

markdown

TL431BQD

Texas Instruments · Voltage References · SOIC-8

TL431BQD from Texas Instruments, in a SOIC-8. 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 CATHODE bidirectional Shunt current/voltage input (cathode), operated with VKA from Vref to 36V (37V absolute max) and IKA from 1mA to 100mA.
2 ANODE power_in Common anode pin, normally connected to ground; internally common with the other ANODE pins (2, 3, 6, 7).
3 ANODE power_in Common anode pin, normally connected to ground; internally common with the other ANODE pins (2, 3, 6, 7).
4 NC unconnected No internal connection.
5 NC unconnected No internal connection.
6 ANODE power_in Common anode pin, normally connected to ground; internally common with the other ANODE pins (2, 3, 6, 7).
7 ANODE power_in Common anode pin, normally connected to ground; internally common with the other ANODE pins (2, 3, 6, 7).
8 REF input Threshold input relative to the common anode, regulated to about 2.5V (Vref); it must not be left floating and needs reference input current of at least 4µA.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category Power Management ICs
Pins 8

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 Vref 2483 2495 2507 mV VKA = Vref, IKA = 10mA, TA = 25°C 14
Deviation of reference input voltage over full temperature range VI(dev) 14 34 mV VKA = Vref, IKA = 10mA 14
Ratio of change in reference voltage to change in cathode voltage (10V - Vref) ΔVref/ΔVKA -1.4 -2.7 mV/V IKA = 10mA, ΔVKA = 10V - Vref 14
Ratio of change in reference voltage to change in cathode voltage (36V - 10V) ΔVref/ΔVKA -1 -2 mV/V IKA = 10mA, ΔVKA = 36V - 10V 14
Reference Input Current Iref 2 4 µA IKA = 10mA, R1 = 10kΩ, R2 = ∞ 14
Deviation of reference input current over full temperature range II(dev) 0.8 2.5 µA IKA = 10mA, R1 = 10kΩ, R2 = ∞ 14
Minimum cathode current for regulation Imin 0.4 0.7 mA VKA = Vref 14
Off-state cathode current Ioff 0.1 0.5 µA VKA = 36V, Vref = 0 14
Dynamic Impedance /ZKA/ 0.2 0.5 Ω VKA = Vref, f ≤ 1kHz, IKA = 1mA to 100mA 14
Cathode Voltage (absolute maximum) VKA 37 V over operating free-air temperature range; with respect to ANODE 5
Continuous Cathode Current Range (absolute maximum) IKA -100 150 mA 5
Reference Input Current (absolute maximum) II(ref) -0.05 10 mA 5
Operating Junction Temperature Range TJ 150 °C 5
Storage Temperature Range Tstg -65 150 °C 5
ESD HBM V(ESD) -2000 2000 V Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 5
ESD CDM V(ESD) -1000 1000 V Charged-device model (CDM), per JEDEC specification JESD22-C101 5
Cathode Voltage (recommended) VKA 36 V min is Vref 5
Continuous Cathode Current Range (recommended) IKA 1 100 mA 5
Operating Free-Air Temperature TA -40 125 °C TL43xxQ 5
Junction-to-ambient thermal resistance RθJA 97 °C/W D package (8 pins) 5
Junction-to-case (top) thermal resistance RθJC(top) 39 °C/W D package (8 pins) 5

CAD (KiCad official)

  • Symbol: TL431BQD
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: tl431bqd-etched.step / tl431bqd-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431bqd.step / tl431bqd.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (85 pp, sha256 ed2e90697de4e2c5, retrieved 2026-10-31, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-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