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LR8103B-T30

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

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PCB Footprint

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Datasheet

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Contents

README

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LR8103B-T30

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

LR8103B-T30 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 Positive supply input. Absolute max 9V; recommended operating up to 6.5V. Bypass with ≥1µF ceramic capacitor close to the pin; a ~10Ω series resistor is recommended to absorb upstream transients.
2 GND power_in Ground reference for the regulator. All voltages in the datasheet are referenced to this pin. Use a wide ground pour for noise immunity and improved thermal dissipation.
3 CE input Chip enable (active-high). VCE ≥ 0.7V enables the regulator; VCE = 0V shuts it down (ISHD ≈ ±1µA). Specified enable-high threshold: 0.7V min, 1.2V max at VIN = 2.2V, IOUT = 1mA. Do not leave floating; tie to VIN if always-on operation is desired.
4 NC unconnected No internal connection. Leave floating or tie to GND for mechanical stability; do not use as a routing point.
5 VOUT power_out Regulated 3.0V output (±1%), rated for 300mA continuous (450mA absolute max). Requires ≥1µF ceramic output capacitor for stability; larger values improve transient response. Internal short-circuit protection clamps ISCP to ~30mA when VOUT falls 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-T30
  • LR8103A-T30

CAD (KiCad official)

  • Symbol: LR8103B-T30
  • 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-t30.step 85 KB You want the bare part, or you mark your own boards.
lr8103b-t30-etched.step 2.3 MB You want the part with LR8103B-T30 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 551 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 1164d007f79e861e, 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