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UM803RS
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Union Semiconductor Supervisor and Reset ICs, SOT-23-3. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+43@@ -0,0 +1,43 @@+# UM803RS++**Union Semiconductor** · Supervisor and Reset ICs · SOT-23-3++UM803RS from Union Semiconductor, in a SOT-23-3. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | GND | power_in | Ground reference (0 V). |+| 2 | RESET | output | Active-low, open-drain reset output. Remains low while VCC is below the reset threshold (typ 2.63 V for the R version) and for at least 140 ms after VCC rises above the threshold. Requires an external pull-up resistor; the pull-up may be tied to a rail higher than VCC. VOL ≤ 0.3 V at ISINK = 50 µA with VCC ≥ 1.0 V. |+| 3 | VCC | power_in | Positive supply and monitored voltage. Absolute max −0.3 V to +6.0 V; operating range 1.0 V to 5.5 V. The R version monitors a nominal +3.0 V rail (reset threshold 2.63 V typ). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Union Semiconductor |+| Package | SOT-23-3 |+| Category | PMIC |+| Pins | 3 |++## Ordering variants++- `UM803RSRS`+- `UM803RSRP`++## CAD (KiCad official)++- Symbol: `UM803RS`+- Footprint: `Package_TO_SOT_SMD:SOT-23-3`+- 3D model: SOT-23-3 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Union Semiconductor datasheet](docs/um803rs-datasheet.pdf) (12 pp, sha256 `064b0eaa669a8ef8`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/um803rs-datasheet.pdf)
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