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UM803MS

Public Made by Adom

by adom

Union Semiconductor Supervisor And Reset ICs, SOT23-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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UM803MS

Union Semiconductor · Supervisor And Reset ICs · SOT23-3

UM803MS 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 supply.
2 RESET output Active-low open-drain reset output that remains low while VCC is below the reset threshold and for at least 140ms after VCC rises above it, requiring a pull-up resistor to any supply between 0 and 6V.
3 VCC power_in Supply voltage input for +5V, +3.3V, +3V or +2.5V systems, with absolute maximum of -0.3 to +6.0V.

Key specifications

Parameter Value
Manufacturer Union Semiconductor
Package SOT23-3
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 Range VCC 1 5.5 V TA=0°C to +70°C 5
Supply Current ICC 2 μA 5
Reset Threshold M Version VTH 4.31 4.38 4.45 V TA=+25°C 5
Reset Threshold M Version VTH 4.25 4.5 V TA=-40°C to +85°C 5
Reset Active Timeout Period tRP 140 240 560 ms 5
RESET Output Voltage Low VOL 0.4 V VCC=VTH min, ISINK=3.2mA, UM803L_/M_/J_ 5
RESET Output Voltage Low VOL 0.3 V VCC>1.0V, ISINK=50μA 5
RESET Open-Drain Output Leakage Current 1 μA VCC>VTH, RESET Deasserted 5
Reset Threshold Tempco 150 ppm/°C 5
VCC to Reset Delay 10 μs VCC=VTH to (VTH-100mV) 5
Supply Voltage VCC -0.3 6 V 4
RESET Voltage RESET -0.3 6 V 4
Input Current, VCC ICC 20 mA 4
Output Current, RESET IO 20 mA 4
Rate of Rise, VCC 100 V/μs 4
Continuous Power Dissipation SOT23-3 PD 320 mW Derate 4mW/°C above 70°C 4
Operating Temperature Range SOT23-3 TA -40 105 °C SOT23-3 4
Storage Temperature Range TSTG -65 150 °C 4
Lead Temperature (Soldering, 10s) 300 °C 4

CAD (KiCad official)

  • Symbol: UM803MS
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT23-3 (KiCad packages3D, STEP)
  • 3D model files: um803ms-etched.step / um803ms-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); um803ms.step / um803ms.glb are the bare package body.

Provenance

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

  • Datasheet: Union Semiconductor datasheet (12 pp, sha256 064b0eaa669a8ef8, retrieved 2026-10-22, 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