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WL2861K33-3

Public Made by Adom

by adom

WILLSEMI Will Semicon Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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WL2861K33-3

WILLSEMI Will Semicon · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89

WL2861K33-3 from WILLSEMI Will Semicon, in a SOT-89. 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 GND power_in Ground pin of the regulator, shown as pin 1 in the top-view pin configuration and listed as 'Ground' in the pin description table.
2 VIN power_in Voltage input rated 4.75 V to 40 V operating (absolute maximum -0.3 V to 45 V), with the input capacitor (10 uF) to be located as close to this pin as possible.
3 VOUT power_out Regulated voltage output, 3.3 V for the WL2861K33-3 (3.234 V to 3.366 V), with absolute maximum VOUT range of -0.3 V to 6.5 V and 100 mA output current, with the output capacitor (10 uF) to be located as close to this pin as possible.

Key specifications

Parameter Value
Manufacturer WILLSEMI Will Semicon
Package SOT-89
Category Power Management (PMIC)
Pins 3

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
VIN Input Range VIN 4.75 40 V IOUT=10mA 3
Output Voltage (3.3V variant) ΔVOUT 3.234 3.3 3.366 V IOUT=10mA 3
Quiescent Current IQ 10 15 μA VIN=7V, No load 3
Quiescent Current IQ 11 16 μA VIN=24V, No load 3
Quiescent Current IQ 13 20 μA VIN=40V, No load 3
Dropout Voltage VDROP 8 12 mV IOUT=1mA 3
Dropout Voltage VDROP 800 1200 mV IOUT=100mA 3
Temperature Coefficient of Output Voltage ΔVo/ΔT -0.5 0.5 mv/℃ IOUT=1mA 3
VIN Range (absolute maximum) VIN -0.3 45 V 3
VOUT Range (absolute maximum) VOUT -0.3 6.5 V 3
Lead Temperature Range 260 oC 3
Storage Temperature Range -55 150 oC 3
Operating Junction Temperature Range 150 oC 3
ESD MM 400 V 3
Operating Supply Voltage 4.75 40 V 3
Operating Temperature Range -40 85 oC 3
Power Dissipation (recommended table) 1000 mW 3
Thermal Resistance (On PCB) RθJA 77 oC/W On PCB 3
Maximum Output Current IOUT_PK 150 mA VIN= VOUT+2V 3
Load Regulation ΔVLoad 0.6 % IOUT=1--100mA 3
Output Noise eNO 250 μV IOUT=10mA 3
Ripple Rejection PSRR 60 dB VIN=10V, VPP=0.5V, IOUT=1mA, f=100Hz 3
Ripple Rejection PSRR 45 dB VIN=10V, VPP=0.5V, IOUT=1mA, f=1KHz 3
Ripple Rejection PSRR 35 dB VIN=10V, VPP=0.5V, IOUT=1mA, f=10KHz 3
Thermal Protection TSD 165 ℃ IOUT=1mA 3

CAD (KiCad official)

  • Symbol: WL2861K33-3
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)
  • 3D model files: wl2861k33-3-etched.step / wl2861k33-3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); wl2861k33-3.step / wl2861k33-3.glb are the bare package body.

Provenance

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

  • Datasheet: WILLSEMI Will Semicon datasheet (10 pp, sha256 aaa0acd9fbbe39e5, retrieved 2026-10-20, 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