component

UM1550S-33

Public Made by Adom

by adom

Union Semiconductor Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT23-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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um1550s-33-etched.glb Publish 0.1.0 · Ray 10d ago
um1550s-33-etched.step um1550s-33: factory component page (tier=mfr) · Ray 10d ago
um1550s-33-hero.glb um1550s-33: hero GLB from the etched model (keeps the MPN mark) · Ray 10d ago
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UM1550S-33

Union Semiconductor · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT23-3

UM1550S-33 from Union Semiconductor, in a SOT23-3. 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 reference for the regulator.
2 VOUT power_out Regulated output voltage, 3.3V fixed for the -33 option, with 300mA guaranteed output current and a 350-550mA current limit.
3 VIN power_in Supply input accepting 1.8V to 8V (absolute maximum -0.3V to +10V).

Key specifications

Parameter Value
Manufacturer Union Semiconductor
Package SOT23-3
Category Power Management (PMIC)
Pins 3

CAD (KiCad official)

  • Symbol: UM1550S-33
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT23-3 (KiCad packages3D, STEP)
  • 3D model files: um1550s-33-etched.step / um1550s-33-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); um1550s-33.step / um1550s-33.glb are the bare package body.

Provenance

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

  • Datasheet: Union Semiconductor datasheet (24 pp, sha256 dbe4313ebf61b9cd, retrieved 2026-10-27, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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