component
UM803SS
Public Made by Adomby adom
Union Semiconductor Supervisor And Reset ICs, 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
markdownUM803SS
Union Semiconductor · Supervisor And Reset ICs · SOT23-3
UM803SS 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. |
| 2 | RESET | output | Active-low open-drain reset output that stays low while VCC is below the reset threshold and for at least 140ms after VCC rises above it, needing an external 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 supplies, with a rated range 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, S Version | VTH | 2.89 | 2.93 | 2.96 | V | TA=+25°C | 5 |
| Reset Threshold, S Version | VTH | 2.85 | 3 | V | TA=-40°C to +85°C | 5 | |
| Reset Active Timeout Period | tRP | 140 | 240 | 560 | ms | 5 | |
| RESET Output Voltage Low | VOL | 0.3 | V | VCC=VTH min, ISINK=1.2mA (UM803T_/S_/R_/Z_) | 5 | ||
| RESET Open-Drain Output Leakage Current | 1 | μA | VCC>VTH, RESET deasserted | 5 | |||
| Supply Voltage | VCC | -0.3 | 6 | V | 4 | ||
| RESET Output 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 | SOT23-3; 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 | 300 | °C | Soldering, 10s | 4 |
CAD (KiCad official)
- Symbol:
UM803SS - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT23-3 (KiCad packages3D, STEP)
- 3D model files:
um803ss-etched.step/um803ss-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);um803ss.step/um803ss.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Union Semiconductor datasheet (12 pp, sha256
064b0eaa669a8ef8, retrieved 2026-10-17, 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).