STWD100NYWY3F

@@ -0,0 +1,50 @@+# STWD100NYWY3F++**STMicroelectronics** · Supervisor and Reset ICs · SOT-23-5++STWD100NYWY3F from STMicroelectronics, in a SOT-23-5. 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 | WDO | output | Active-low watchdog output. Asserted low when the internal watchdog timer expires without being cleared. Available as open-drain (requires external pull-up, e.g. 10 kΩ to a supply up to 6 V) or push-pull depending on device suffix. |+| 2 | GND | power_in | Device ground reference. |+| 3 | EN | input | Active-low chip enable input. When low the watchdog is enabled; when high the watchdog is disabled. Has an internal pull-down to GND, so the device is enabled if EN is left floating. Pulses ≥1 µs are detected; glitches shorter than 100 ns are ignored. |+| 4 | WDI | input | Watchdog input. Must be toggled within the watchdog timeout period tWD to clear the internal timer, otherwise WDO is asserted. Low-to-high transitions reset the timer on all versions; high-to-low transitions also reset it on STWD100xW/xX/xY. Pulses ≥1 µs are detected; glitches shorter than 100 ns are ignored. |+| 5 | VCC | power_in | Supply voltage input. Watchdog timer starts running once VCC rises above the startup voltage VSTART (~2.2 V). Typical operating current 13 µA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STMicroelectronics |+| Package | SOT-23-5 |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++- `STWD100NYWY3FNWWY3F`+- `STWD100NYWY3FNYWY3F`+- `STWD100NYWY3FNPWY3F`+- `STWD100NYWY3FYNWWY3F`+- `STWD100NYWY3FYNYWY3F`+- `STWD100NYWY3FYNPWY3F`+- `STWD100NYWY3FPYW83F`++## CAD (KiCad official)++- Symbol: `STWD100NYWY3F`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/stwd100nywy3f.pdf) (25 pp, sha256 `19da7a7a2693f2c9`, retrieved 2026-08-17, tier: manufacturer)+- **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/stwd100nywy3f-datasheet.pdf)

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