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LP3981-12B5F

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by Ray

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

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Datasheet

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Contents

README

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LP3981-12B5F

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

LP3981-12B5F from LOWPOWER, in a SOT-23-5. 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 Power input voltage. Operating range 2.5V to 5.5V (absolute max 6V). Requires >=1uF ceramic or tantalum bypass capacitor placed within 0.5 inch of the pin.
2 GND power_in Device ground reference. Return path for input and output capacitors; should be tied to a clean analog ground plane.
3 EN input Chip enable, active high. VIH >= 1.2V enables the regulator; VIL <= 0.4V puts it in shutdown (<0.01uA typ). Pin is high impedance; use a 100kOhm pull-down to GND if the control signal can float, or tie to VIN for always-on operation.
4 NC unconnected No connect. Leave floating or tie to GND per typical application circuit.
5 VOUT power_out Regulated output voltage (1.2V nominal for the -12 option, +/-2% accuracy). Rated 300mA continuous, 550mA peak, with 400mA typical current limit. Requires >=1uF low-ESR ceramic output capacitor (ESR >25mOhm) within 0.5 inch of the pin for stability.

Key specifications

Parameter Value
Manufacturer LOWPOWER
Package SOT-23-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • LP3981-12B5F
  • LP3981-12B5F13B5F
  • LP3981-12B5F15B5F
  • LP3981-12B5F18B5F
  • LP3981-12B5F25B5F
  • LP3981-12B5F28B5F
  • LP3981-12B5F30B5F
  • LP3981-12B5F33B5F

CAD (KiCad official)

  • Symbol: LP3981-12B5F
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: LOWPOWER datasheet (6 pp, sha256 bf3050f50c362057, retrieved 2026-08-17, tier: lcsc)
  • 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