LR8103A-T25 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. All voltages are referenced to this pin.
2	VOUT	power_out	Regulated output pin providing the fixed 2.5 V output (LR8103A-T25) at up to 300 mA. Requires an external ceramic bypass capacitor (≥1 uF recommended) close to the pin for output stability and transient response.
3	VIN	power_in	Input supply pin. Accepts up to 6.5 V (absolute max 9 V). Requires an external ceramic bypass capacitor of at least 1 uF close to the pin, especially with high-impedance battery sources.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

LR8103A-T25
LR8103B-T25

CAD (KiCad official)

Symbol: LR8103A-T25
Footprint: Package_TO_SOT_SMD:SOT-23-3
3D model: SOT-23-3L (KiCad packages3D, STEP)

Provenance

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

Datasheet: LR datasheet (10 pp, sha256 7acde81be9ac3e14, 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