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LP3981-18B5F

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LOWPOWER Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LP3981-18B5F

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

LP3981-18B5F from LOWPOWER, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VIN power_in Power input voltage; recommended supply range is 2.5V to 5.5V, with a 6V absolute maximum.
2 GND power_in Ground reference pin for the regulator.
3 EN input Active-high chip enable with 0V to 5.5V input range; the LDO turns on above 1.2V and shuts down below 0.4V, and the pin is high impedance so a 100kΩ pull-down to GND is needed when the control signal floats.
4 NC unconnected No internal connection.
5 VOUT power_out Regulated output voltage; a ceramic output capacitor of at least 1µF with ESR greater than 25mΩ is required for stability and should be placed not more than 0.5 inch from the VOUT pin.

Key specifications

Parameter Value
Manufacturer LOWPOWER
Package SOT-23-5
Category Power Management (PMIC)
Pins 5

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Output Voltage Accuracy ΔVOUT -2 2 % IOUT = 1mA 3
Load Regulation ΔVLOAD 2 % 1mA < IOUT < 300mA 3
Line Regulation ΔVLINE 0.3 % VIN = (VOUT + 1V) to 5.5V, IOUT = 1mA 3
Standby Current ISTBY 0.01 1 μA VEN = GND, Shutdown 3
EN Input Bias Current IIBSD 0.01 100 nA VEN = GND or VIN 3
Current Limit ILIM 360 400 mA RLOAD = 1Ω 3
Quiescent Current IQ 45 120 μA VEN ≥ 1.2V, IOUT = 0mA 3
Maximum output Current Imax 300 mA VEN=VIN, VIN>2.5V 3
EN Logic-Low Voltage (Shutdown) VIL 0.4 V VIN=3V to 5.5V, Shutdown 3
EN Logic-High Voltage (Start-Up) VIH 1.2 V VIN=3V to 5.5V, Start-Up 3
Output Noise Voltage 100 uVRMS 10Hz to 100kHz, IOUT=200mA COUT=1µF 3
Absolute Maximum Supply Input Voltage 6 V 3
Power Dissipation (SOT-25) PD 400 mW TA = 25°C, SOT-25 package 3
Lead Temperature (Soldering) 260 °C Soldering, 10 sec. 3
Storage Temperature Range -65 150 °C 3
ESD Susceptibility HBM 2 kV Human Body Model 3
ESD Susceptibility MM 200 V Machine Model 3
Supply Input Voltage (recommended) 2.5 5.5 V 3
EN Input Voltage 0 5.5 V 3
Operation Junction Temperature Range -40 125 °C 3
Operation Ambient Temperature Range -40 85 °C 3
Power Supply Rejection Rate at 100Hz PSRR -76 dB f=100Hz, COUT=1µF, IOUT=50mA 3
Power Supply Rejection Rate at 10kHz PSRR -73 dB f=10kHz, COUT=1µF, IOUT=50mA 3
Thermal Shutdown Temperature TSD 150 °C 3
Package Thermal Resistance (SOT-25) θJA 250 °C/W SOT-25 package 3

CAD (KiCad official)

  • Symbol: LP3981-18B5F
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: lp3981-18b5f-etched.step / lp3981-18b5f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lp3981-18b5f.step / lp3981-18b5f.glb are the bare package body.

Provenance

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

  • Datasheet: LOWPOWER datasheet (6 pp, sha256 bf3050f50c362057, retrieved 2026-10-19, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF