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UM1550S-30

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

componentpower management (pmic)um1550s-30factory-2.0.0extractor-text

Verified UM1550S-30

by Ray · last 4 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

4 Nov 2026RayPublished by the parts factory: tier mfr, 3 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: UM1550S-30 · SOT-23-3 · 3 pins
  • ✓copper: 3 copper pads, none touching another net
  • ✓datasheet: all 3 pin names found in the 24-page datasheet
  • •distributor (warn): no ['mouser'] number
  • ✓family: SOT-23-3
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-x4mw06_m/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • ✓package_fit: height and body within the datasheet's package drawing (datasheet p.9)
  • ✓pads: 3 pins = 3 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 3 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ um1550s-30.kicad_sym✓ um1550s-30.kicad_mod✓ um1550s-30.step
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Contents

README

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UM1550S-30

Union Semiconductor · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3

UM1550S-30 from Union Semiconductor, in a SOT-23-3. 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 Voltage regulated output, fixed 3.0V for the -30 option, delivering up to 300mA guaranteed output current.
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 SOT-23-3
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
Input Voltage Range VIN 1.8 8 V 6
Output Voltage Accuracy -2.5 2.5 % 1mA≤IOUT≤250mA 6
Output Current IOUT 300 mA 6
Output Current Limit ILIMIT 350 450 550 mA RL=1Ω 6
Operating Quiescent Current IQ 2.5 3.5 μA VIN=8V, IOUT=0mA 6
Dropout Voltage ΔVDO 250 330 mV IOUT=200mA 6
Input Low Voltage (SHDN) VIL 0.4 V VIN=1.8V to 8V 6
Input High Voltage (SHDN) VIH 1.2 V VIN=1.8V to 8V 6
Line Regulation 0.3 %/V VOUT+0.3V≤VIN≤8.0V or VIN>1.8V, IOUT=10mA 6
Load Regulation 0.6 % VIN=VOUT+1V or VIN>1.8V, 1mA≤IOUT≤250mA 6
Shut Down Quiescent Current 1 μA VIN=8V, SHDN=GND 6
SHDN Input Current ISHDN 1 μA SHDN=VIN or GND 6
ESD Rating 2 kV Human Body Mode 6
Supply Voltage on VIN Pin VIN -0.3 10 V 5
Voltage on VOUT Pin VOUT -0.3 10 V 5
Operating Junction Temperature TJ -40 125 °C Note 2, 3 5
Storage Temperature Range TSTG -65 150 °C 5
Lead Temperature for Soldering TL 260 °C 10 seconds 5
Power Dissipation PD 0.4 W TA=25°C, SOT23-3 (Note 4) 5
Output Voltage Temperature Coefficient 60 ppm/°C TC -40°C to +125°C 6
Output Voltage Noise 115 μVRMS VOUT=3.0V, f=10Hz to 100kHz, CIN=1μF, IOUT=100mA 6
Power Supply Ripple Rejection at 100Hz PSRR 56 dB VIN=VOUT+1V, IOUT=100mA, f=100Hz 6
Power Supply Ripple Rejection at 1kHz PSRR 42 dB VIN=VOUT+1V, IOUT=100mA, f=1kHz 6
Startup Time t 80 μs VOUT=3.3V, RL=68Ω, COUT=1μF 6
Package Thermal Resistance Junction-to-Ambient (SOT23-3) θJA 250 °C/W SOT23-3 5

CAD (KiCad official)

  • Symbol: UM1550S-30
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3 (KiCad packages3D, STEP)
  • 3D model files: um1550s-30-etched.step / um1550s-30-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); um1550s-30.step / um1550s-30.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 2026-11-04, 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