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TL431CLPR

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Texas Instruments Voltage Reference, TO-92-3. 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 tl431clpr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
viewers tl431clpr: viewers · Ray 1mo ago
package.json tl431clpr: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray 1mo ago
page.json tl431clpr: specified limits as data (metadata.characteristics, 19 rows from the datasheet) · Ray 26d ago
README.md tl431clpr: specified limits as data (metadata.characteristics, 19 rows from the datasheet) · Ray 26d ago
tl431clpr-etched.fit.json tl431clpr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431clpr-etched.glb tl431clpr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431clpr-etched.step tl431clpr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431clpr.glb Publish 0.1.0 · Ray 1mo ago
tl431clpr.kicad_mod Publish 0.1.0 · Ray 1mo ago
tl431clpr.kicad_sym Publish 0.1.0 · Ray 1mo ago
tl431clpr.lbr Publish 0.1.0 · Ray 1mo ago
tl431clpr.step Publish 0.1.0 · Ray 1mo ago

TL431CLPR

Texas Instruments · Voltage Reference · TO-92-3

TL431CLPR from Texas Instruments, in a TO-92-3. 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 output Cathode output for parallel shunt regulation, accepts 1 to 100 mA continuous current, provides programmable output voltage from 2.5V to 36V with typical output impedance of 0.2Ω, referenced to anode.
2 ANODE power_in Ground reference pin connected to system ground, provides voltage reference for the internal 2.5V reference and all circuit operations.
3 REF input Reference input pin compared against 2.5V ±0.5% (C-grade) internal reference, requires 2 to 4 µA input current, set output voltage via external feedback resistor divider network.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package TO-92-3
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 voltage (VKA = Vref, IKA = 10 mA, 25°C) Vref 2440 2495 2550 mV VKA = Vref, IKA = 10mA 7
Reference voltage deviation over full temperature range (all other devices, not SOT23-3 / TL432) VI(dev) 4 25 mV VKA = Vref, IKA = 10mA; all other devices 7
Ratio of reference voltage change to cathode voltage change ΔVref/ΔVKA -1.4 -2.7 mV/V IKA = 10mA; ΔVKA = 10V - Vref 7
Ratio of reference voltage change to cathode voltage change ΔVref/ΔVKA -1 -2 mV/V IKA = 10mA; ΔVKA = 36V - 10V 7
Reference input current Iref 2 4 µA IKA = 10mA, R1 = 10kΩ, R2 = ∞ 7
Reference input current deviation over full temperature range II(dev) 0.4 1.2 µA IKA = 10mA, R1 = 10kΩ, R2 = ∞ 7
Minimum cathode current for regulation Imin 0.4 1 mA VKA = Vref 7
Off-state cathode current Ioff 0.1 1 µA VKA = 36V, Vref = 0 7
Dynamic impedance /ZKA/ 0.2 0.5 Ω VKA = Vref, f ≤ 1kHz, IKA = 1mA to 100mA 7
Cathode voltage (absolute maximum) VKA 37 V All voltages referenced to ANODE 6
Continuous cathode current range (absolute maximum) IKA -100 150 mA 6
Reference input current (absolute maximum) II(ref) -0.05 10 mA 6
Operating junction temperature range (absolute maximum) TJ 150 °C 6
Storage temperature range Tstg -65 150 °C 6
Cathode voltage (recommended) VKA 36 V Minimum given as Vref 6
Continuous cathode current range (recommended) IKA 1 100 mA 6
Operating free-air temperature range, TL431C grade TA 0 70 °C Natural convection; TL43xxC 6
Junction-to-ambient thermal resistance (LP / TO-92 package) RθJA 140 °C/W 6
Junction-to-case (top) thermal resistance (LP / TO-92 package) RθJC(top) 55 °C/W 6

CAD (KiCad official)

  • Symbol: TL431CLPR
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92-3 (KiCad packages3D, STEP)
  • 3D model files: tl431clpr-etched.step / tl431clpr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431clpr.step / tl431clpr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (86 pp, sha256 313277b9351e61ed, retrieved 2026-09-23, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-4-6 (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