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TL431IZT

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STMicroelectronics Voltage Reference, TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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docs tl431izt: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
viewers tl431izt: viewers · Ray 1mo ago
package.json tl431izt: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray 1mo ago
page.json tl431izt: specified limits as data (metadata.characteristics, 21 rows from the datasheet) · Ray 25d ago
README.md tl431izt: specified limits as data (metadata.characteristics, 21 rows from the datasheet) · Ray 25d ago
tl431izt-etched.fit.json tl431izt: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431izt-etched.glb tl431izt: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431izt-etched.step tl431izt: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431izt.glb Publish 0.1.0 · Ray 1mo ago
tl431izt.kicad_mod Publish 0.1.0 · Ray 1mo ago
tl431izt.kicad_sym Publish 0.1.0 · Ray 1mo ago
tl431izt.lbr Publish 0.1.0 · Ray 1mo ago
tl431izt.step Publish 0.1.0 · Ray 1mo ago

TL431IZT

STMicroelectronics · Voltage Reference · TO-92

TL431IZT from STMicroelectronics, in a TO-92. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 Cathode passive Cathode (K) terminal of the shunt regulator; operates over a cathode-to-anode voltage of Vref to 36 V and a cathode current range of 1 to 100 mA (absolute max -100 to +150 mA), with typical dynamic impedance 0.22 Ω.
2 Anode passive Anode (A) terminal of the shunt regulator, forming the return path for the cathode current; cathode-to-anode voltage rating is Vref to 36 V (absolute max 37 V).
3 Ref input Reference input to the internal comparator; reference input current range is -0.05 to +10 mA (absolute max) with typical Iref of 1.8 µA, used with external resistor divider to program the output voltage from 2.5 V to 36 V.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package TO-92
Category Power Management (PMIC)
Pins 3

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 input voltage (Tamb = 25 °C) Vref 2.44 2.495 2.55 V VKA = Vref, Ik = 10 mA, Tamb = 25 °C 5
Reference input voltage over temperature range Vref 2.41 2.58 V VKA = Vref, Ik = 10 mA, Tmin ≤ Tamb ≤ Tmax 7
Reference input voltage deviation over temperature range Vref 7 30 mV VKA = Vref, Ik = 10 mA, Tmin ≤ Tamb ≤ Tmax 7
Ratio of change in reference input voltage to change in cathode-anode voltage (VKA = 10 V to Vref) ΔVref/ΔVKA -2.7 -2 -1.4 mV/V Ik = 10 mA, VKA = 10 V to Vref 7
Ratio of change in reference input voltage to change in cathode-anode voltage (VKA = 36 V to 10 V) ΔVref/ΔVKA -1 mV/V Ik = 10 mA, VKA = 36 V to 10 V 7
Reference input current (Tamb = 25 °C) Iref 1.8 4 µA Ik = 10 mA, R1 = 10 k, R2 = Tamb = 25 °C 7
Reference input current over temperature range Iref 6.5 µA Ik = 10 mA, R1 = 10 k, R2 = Tmin ≤ Tamb ≤ Tmax 7
Reference input current deviation over temperature range Iref 0.8 2.5 µA Ik = 10 mA, R1 = 10 k, R2 = Tmin ≤ Tamb ≤ Tmax 7
Minimum cathode current for regulation Imin 0.5 1 mA VKA = Vref 7
Off-state cathode current Ioff 2.6 1000 nA 7
Dynamic impedance ZKA 0.22 0.5 Ω VKA = Vref, Ik = 1 to 100 mA, f ≤ 1 kHz 7
Cathode to anode voltage (absolute maximum) VKA 37 V 4
Continuous cathode current range (absolute maximum) Ik -100 150 mA 4
Reference input current range (absolute maximum) Iref -0.05 10 mA 4
Storage temperature range Tstg -65 150 °C 4
Junction temperature TJ 150 °C 4
Cathode to anode voltage (recommended operating range, upper bound) VKA 36 V Lower bound printed as Vref (not a numeric value) 4
Cathode current (recommended operating range) Ik 1 100 mA 4
Operating free-air temperature range (TL431I/AI - TL432I/AI) Toper -40 105 °C 4
Thermal resistance junction to case (TO-92) Rthjc 57 °C/W 4
Thermal resistance junction to ambient (TO-92) Rthja 200 °C/W 4

CAD (KiCad official)

  • Symbol: TL431IZT
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92 (KiCad packages3D, STEP)
  • 3D model files: tl431izt-etched.step / tl431izt-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431izt.step / tl431izt.glb are the bare package body.

Provenance

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

  • Datasheet: STMicroelectronics datasheet (22 pp, sha256 d174b1869a9d426d, retrieved 2026-09-23, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-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