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LR8103A-T12

Public Unreviewed

by Ray

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

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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

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LR8103A-T12

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

LR8103A-T12 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 for the regulator. Connect directly to the system ground plane. Return path for both quiescent current and load current.
2 VOUT power_out Regulated fixed output. For the T12 option this is 1.2 V nominal (±1% initial accuracy) with up to 300 mA continuous (450 mA absolute max). Requires an external ceramic output capacitor of at least 1 uF (1-10 uF recommended) close to the pin for stability.
3 VIN power_in Unregulated input supply, 2.2 V to 6.5 V operating (absolute max 9 V). Requires an external ceramic bypass capacitor of at least 1 uF (1-10 uF recommended) placed close to the pin; a small (~10 Ω) series resistor is recommended to absorb upstream input spikes.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LR8103A-T12
  • LR8103A-T12B-T12
  • LR8103A-T12A-M18
  • LR8103A-T12A-M28
  • LR8103A-T12A-M30
  • LR8103A-T12A-M33
  • LR8103A-T12B-N18
  • LR8103A-T12B-N28
  • LR8103A-T12B-N30
  • LR8103A-T12B-N33

CAD (KiCad official)

  • Symbol: LR8103A-T12
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lr8103a-t12.step 59 KB You want the bare part, or you mark your own boards.
lr8103a-t12-etched.step 1.8 MB You want the part with LR8103A-T12 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 453 faces against 69 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: LR datasheet (14 pp, sha256 82735f0d7eefd4a2, retrieved 2026-08-17, tier: lcsc)
  • 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