component
UM1550S-33
Public Made by Adomby 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.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownUM1550S-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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);um1550s-33.step/um1550s-33.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).