# STWD100YNPWY3F

**STMicroelectronics** · Supervisor And Reset ICs · SOT-23-5

STWD100YNPWY3F from STMicroelectronics, in a SOT-23-5. 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 | WDO | output | Active-low watchdog output, asserted when WDI is not toggled within tWD; configurable as open drain (needs an external pull-up to up to 6 V) or push-pull. |
| 2 | GND | power_in | Ground reference pin. |
| 3 | EN | input | Chip enable input with an internal pull-down (32 kΩ to 100 kΩ); the device is enabled when left floating, and pulses of at least 1 µs are detected while glitches under 100 ns are ignored. |
| 4 | WDI | input | Watchdog input that must be toggled within the watchdog timeout period tWD; pulses of at least 1 µs are detected and glitches shorter than 100 ns are ignored. |
| 5 | VCC | power_in | Supply voltage, specified from 2.7 V to 5.5 V with absolute maximum rating of -0.3 V to 7.0 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating voltage | VCC | 2.7 | 5 | 5.5 | V |  | 12 |
| VCC supply current | ICC |  | 13 | 26 | µA |  | 12 |
| Open drain output leakage current | ILO | -1 |  | 1 | µA | From output to GND or VCC | 12 |
| Input leakage current (WDI) |  | -1 |  | 1 | µA |  | 12 |
| Input high voltage (WDI, EN) | VIH | 0.7 |  |  | V | Multiplied by VCC | 12 |
| Input low voltage (WDI, EN) | VIL |  |  | 0.3 | V | Multiplied by VCC | 12 |
| Output low voltage (WDO) | VOL |  |  | 0.3 | V | VCC ≥ 2.7 V, ISINK = 1.2 mA | 12 |
| Output low voltage (WDO) | VOL |  |  | 0.4 | V | VCC ≥ 4.5 V, ISINK = 3.2 mA | 12 |
| Output high voltage (WDO), push-pull only | VOH | 0.8 |  |  | V | VCC ≥ 2.7 V, ISOURCE = 500 µA; multiplied by VCC | 12 |
| EN pull-down resistance |  | 32 | 63 | 100 | kΩ |  | 12 |
| EN glitch rejection |  |  |  | 100 | ns | Glitches shorter than this are ignored | 12 |
| EN input pulse width |  | 1 |  |  | µs | Pulses of at least this duration are detected | 12 |
| Timer startup voltage | VSTART | 1.9 | 2.2 | 2.7 | V |  | 13 |
| Watchdog timeout period (STWD100xP) | tWD | 2.3 | 3.4 | 4.6 | ms | STWD100xP | 13 |
| WDI pulse width |  | 1 |  |  | µs | Pulses of at least this duration are detected | 13 |
| WDI glitch rejection |  |  |  | 100 | ns | Glitches shorter than this are ignored | 13 |
| Storage temperature (VCC off) | TSTG | -55 |  | 150 | °C |  | 11 |
| Lead solder temperature for 10 seconds | TSLD |  |  | 260 | °C | Reflow peak 260 °C; total budget not to exceed 245 °C for more than 30 s | 11 |
| Input or output voltage | VIO | -0.3 |  |  | V | Referenced to VCC + 0.3 V | 11 |
| Supply voltage | VCC | -0.3 |  | 7 | V |  | 11 |
| Output current | IO |  |  | 20 | mA |  | 11 |
| Power dissipation | PD |  |  | 320 | mW |  | 11 |
| Supply voltage | VCC | 2.7 |  | 5.5 | V |  | 12 |
| Ambient operating temperature | TA | -40 |  | 125 | °C |  | 12 |

## CAD (KiCad official)

- Symbol: `STWD100YNPWY3F`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `stwd100ynpwy3f-etched.step` / `stwd100ynpwy3f-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stwd100ynpwy3f.step` / `stwd100ynpwy3f.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/stwd100ynpwy3f.pdf) (20 pp, sha256 `2ec54876f17739de`, retrieved 2026-11-05, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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](docs/stwd100ynpwy3f-datasheet.pdf)