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UM1550Y-36

Public Made by Adom

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

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UM1550Y-36

Union Semiconductor · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

UM1550Y-36 from Union Semiconductor, in a SOT-89-3. 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.
2 VIN power_in Supply input; input voltage range 1.8V to 8V (absolute maximum -0.3 to +10V).
3 VOUT power_out Regulated output voltage (3.6V for the -36 option), up to 300mA output current, absolute maximum -0.3 to +10V.

Key specifications

Parameter Value
Manufacturer Union Semiconductor
Package SOT-89-3
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
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, SOT89-3 PD 1 W @25°C (Note 4) 5
Input Voltage Range VIN 1.8 8 V 6
Output Voltage Range (family range, 1.2V to 5.0V options) VOUT 1.2 5 V 6
Operating Quiescent Current IQ 2.5 3.5 μA VIN=8V, IOUT=0mA 6
Shut Down Quiescent Current 1 μA VIN=8V, SHDN=GND 6
Input Current (SHDN) ISHDN 1 μA SHDN=VIN or GND 6
Output Current IOUT 300 mA 6
Output Voltage Accuracy -2.5 2.5 % 1mA≤IOUT≤250mA 6
Dropout Voltage ΔVDO 250 330 mV IOUT=200mA 6
Output Current Limit ILIMIT 350 450 550 mA RL=1Ω 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
Output Voltage TC 60 ppm/°C -40°C to +125°C 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
Output Thermal Resistance, package as printed SOT89-5 (see review) θJA 100 °C/W 5
Startup Time Response t 80 μs VOUT=3.3V, RL=68Ω, COUT=1μF 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
ESD Rating, Human Body Mode 2 kV 6

CAD (KiCad official)

  • Symbol: UM1550Y-36
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: um1550y-36-etched.step / um1550y-36-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); um1550y-36.step / um1550y-36.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 2026-10-19, tier: lcsc)
  • 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