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LR8103B-T25

Public Unreviewed

by Ray

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

markdown

LR8103B-T25

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

LR8103B-T25 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 Unregulated supply input, 0 to 6.5V absolute maximum (9V transient). Bypass to GND with at least 1µF ceramic, placed close to the pin; a series ~10Ω resistor is recommended to absorb upstream spikes.
2 GND power_in Device ground reference. All specified voltages are relative to GND. Use a large ground pour for noise immunity and thermal dissipation.
3 CE input Chip-enable input. Drive high (0.7V min, 1.2V max threshold at VIN=2.2V) to enable the regulator; drive to 0V to disable, dropping supply current to the ±1µA shutdown level. Do not leave floating.
4 NC unconnected No internal connection. Leave floating or tie to GND per PCB preference.
5 VOUT power_out Regulated 2.5V output (±1%), up to 300mA. Requires a ≥1µF ceramic output capacitor for stability. Internal short-circuit protection clamps the output current to ~30mA when VOUT is pulled below 0.7V.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LR8103B-T25
  • LR8103A-T25

CAD (KiCad official)

  • Symbol: LR8103B-T25
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lr8103b-t25.step 85 KB You want the bare part, or you mark your own boards.
lr8103b-t25-etched.step 2.2 MB You want the part with LR8103B-T25 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 535 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 9a6b1e38d52b38ed, 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