component

LR8103B-T28

Public Made by Adom

by adom

LR Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5L. 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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LR8103B-T28

LR · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5L

LR8103B-T28 from LR, in a SOT-23-5L. 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 VIN power_in Input supply pin. Absolute max 9V; recommended operating range up to 6.5V. Requires an external bypass capacitor (>=1uF ceramic recommended) close to the pin.
2 GND power_in Ground reference for the regulator. All voltages are referenced to this pin.
3 CE input Chip enable. Drive high (VCE >= 0.7V, typical spec 0.7V min / 1.2V max at VIN=2.2V) to enable the regulator; drive low (VCE=0V) to shut down (ISHD ±1uA).
4 NC unconnected No internal connection. Leave floating or tie to a convenient net per PCB layout preference.
5 VOUT power_out Regulated 2.8V output (±1%, VOUT0.99 to VOUT1.01). Delivers up to 300mA typical; internal short-circuit protection clamps output current to ~30mA when VOUT < 0.7V. Requires an external output capacitor (>=1uF ceramic recommended).

Key specifications

Parameter Value
Manufacturer LR
Package SOT-23-5L
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • LR8103B-T28
  • LR8103A-T28

CAD (KiCad official)

  • Symbol: LR8103B-T28
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5L (KiCad packages3D, STEP)
  • 3D model files: lr8103b-t28-etched.step / lr8103b-t28-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lr8103b-t28.step / lr8103b-t28.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lr8103b-t28.step 85 KB You want the bare part, or you mark your own boards.
lr8103b-t28-etched.step 2.3 MB You want the part with LR8103B-T28 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 547 faces against 102 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 (10 pp, sha256 6741742157f665e3, 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