component

LR8103B-T18

Public Unreviewed

by Ray

LR Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5L. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentpmiclr8103b-t18
Overview Files Discover Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

3D Model

Open in new tab ↗
Loads on click. Unloads only if this page sits in the background.

Symbol & Footprint

Schematic Symbol

Open full view ↗
Loads on click. Unloads only if this page sits in the background.

PCB Footprint

Open full view ↗
Loads on click. Unloads only if this page sits in the background.

Datasheet

Open in new tab ↗
Loads on click. Unloads only if this page sits in the background.
Download PDF
Contents

README

markdown

LR8103B-T18

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

LR8103B-T18 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. Accepts 2.8V-6.5V (VOUT+1V minimum for regulation, 6.5V absolute max recommended; 9V hard abs-max). Bypass with at least a 1µF ceramic capacitor placed close to the pin; a series 10Ω resistor is recommended to absorb upstream input spikes.
2 GND power_in Device ground / reference return. All voltages are referenced to this pin. Tie to a solid ground plane for best thermal and noise performance.
3 CE input Chip Enable (active high). VCE ≥ 0.7V (max 1.2V threshold spec at VIN=2.2V) turns the regulator on; VCE=0V puts the part in shutdown with ISHD ≤ 1µA. Do not leave floating; tie to VIN for always-on operation.
4 NC unconnected No internal connection. Leave floating or tie to GND; do not use as a routing via.
5 VOUT power_out Regulated 1.8V output (±1% initial accuracy), delivering up to 300mA typical (450mA abs-max). Requires at least a 1µF ceramic output capacitor for loop stability and transient response; larger values reduce transient droop. Short-circuit protection clamps output current 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-T18
  • LR8103A-T18

CAD (KiCad official)

  • Symbol: LR8103B-T18
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5L (KiCad packages3D, STEP)

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