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LR431AKLT1G

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LRC Voltage Reference, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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docs lr431aklt1g: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
viewers lr431aklt1g: viewers · Ray 1mo ago
lr431aklt1g-etched.fit.json lr431aklt1g: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
lr431aklt1g-etched.glb lr431aklt1g: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
lr431aklt1g-etched.step lr431aklt1g: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
lr431aklt1g.glb Publish 0.1.0 · Ray 1mo ago
lr431aklt1g.kicad_mod Publish 0.1.0 · Ray 1mo ago
lr431aklt1g.kicad_sym Publish 0.1.0 · Ray 1mo ago
lr431aklt1g.lbr Publish 0.1.0 · Ray 1mo ago
lr431aklt1g.step Publish 0.1.0 · Ray 1mo ago
package.json lr431aklt1g: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray 1mo ago
page.json lr431aklt1g: specified limits as data (metadata.characteristics, 17 rows from the datasheet) · Ray 25d ago
README.md lr431aklt1g: specified limits as data (metadata.characteristics, 17 rows from the datasheet) · Ray 25d ago

LR431AKLT1G

LRC · Voltage Reference · SOT-23

LR431AKLT1G from LRC, in a SOT-23. 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 REF input Reference input pin connected to internal 2.5 V error-amplifier; reference input current Iref 0.5 µA typ / 1.2 µA max (IKA = 10 mA, R1 = 10 kΩ); full-temperature deviation 0.4 µA typ / 1.2 µA max.
2 K power_in Cathode terminal; regulated supply node with VKA range VREF to 36 V; continuous cathode current −100 mA to +150 mA; minimum cathode current for regulation 0.08 mA typ / 0.3 mA max; dynamic impedance 0.1 Ω typ at 1 kHz.
3 A power_in Anode terminal; connect to circuit ground reference; all voltages and the 2.5 V internal reference are measured with respect to this pin.

Key specifications

Parameter Value
Manufacturer LRC
Package SOT-23
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 1 (0.5% grade, Vref 2.50 V class) Vref 2.488 2.5 2.512 V VKA=VREF,IKA=10mA 2
Reference Input Voltage 2 (0.5% grade, Vref 2.495 V class) Vref 2.483 2.495 2.507 V VKA=VREF,IKA=10mA 2
Deviation of reference input voltage over temperature Vref 8 17 mV VKA=VREF,IKA=10mA,TMIN to TA to TMAX 2
Ratio of change in reference input voltage to change in cathode voltage (VKA=10V to VREF) Vref/VKA -1 -2.7 mV/V IKA=10mA,VKA=10V~VREF 2
Ratio of change in reference input voltage to change in cathode voltage (VKA=36V to 10V) Vref/VKA -0.4 mV/V IKA=10mA,VKA=36V~10V 2
Reference input current Iref 0.5 1.2 µA IKA=10mA,R1=10kΩ,R2= 2
Deviation of reference input current over full temperature range Iref/T 0.4 1.2 µA IKA=10mA,R1=10k,R2=,TA=full temperature range 2
Minimum cathode current for regulation IKA(min) 0.08 0.3 mA VKA=VREF 2
Off-state cathode current IKA(OFF) 0.01 0.8 µA VKA=36V,VREF=0 2
Dynamic impedance ZKA 0.1 0.37 Ω VKA=VREF,IKA=0.2 to 100mA,f1.0kHz 2
Cathode current (continuous) recommended range IKA 100 mA 2
Operating ambient temperature range (classification table) Topr -40 125 °C 2
Cathode current range (continuous) IKA -100 150 mA 2
Reference input current range Iref -0.05 10 mA 2
Operating junction temperature Tj 150 °C 2
Storage temperature Tstg -65 150 °C 2
Thermal resistance, junction to ambient θJA 206 °C/W 2

CAD (KiCad official)

  • Symbol: LR431AKLT1G
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: lr431aklt1g-etched.step / lr431aklt1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lr431aklt1g.step / lr431aklt1g.glb are the bare package body.

Provenance

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

  • Datasheet: LRC datasheet (5 pp, sha256 2af43aa6be3e061f, retrieved 2026-09-22, tier: lcsc)
  • 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