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lr8103a-t28

Public Made by Adom

by adom

LR Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-3L. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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README

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LR8103A-T28

LR · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3L

LR8103A-T28 from LR, in a SOT-23-3L. 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 GND power_in Ground reference (0 V). All voltages in the datasheet are referenced to this pin.
2 VOUT power_out Regulated output voltage pin. Fixed 2.8 V nominal (±1%) for the -T28 option, delivering up to 300 mA (450 mA absolute max). Requires an external ceramic bypass capacitor (≥1 µF) close to the pin for stability and transient response.
3 VIN power_in Unregulated supply input. Operating range up to 6.5 V (9 V absolute max). Requires an external ceramic bypass capacitor (≥1 µF) close to the pin, especially with high-impedance battery sources; a ~10 Ω series resistor is recommended to absorb upstream spikes.

Key specifications

Parameter Value
Manufacturer LR
Package SOT-23-3L
Category PMIC
Pins 3

Ordering variants

  • LR8103A-T28
  • LR8103A-T28LR8103B-T28

CAD (KiCad official)

  • Symbol: LR8103A-T28
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3L (KiCad packages3D, STEP)
  • 3D model files: lr8103a-t28-etched.step / lr8103a-t28-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lr8103a-t28.step / lr8103a-t28.glb are the bare package body.

Provenance

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

  • Datasheet: LR datasheet (None pp, sha256 7acde81be9ac3e14, retrieved 2026-08-17, 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: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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