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UM1550Y-36
Public Made by Adomby adom
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.
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
markdownUM1550Y-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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);um1550y-36.step/um1550y-36.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 2026-10-19, tier: lcsc) - 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).