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STWD100NXWY3F

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by Ray

STMicroelectronics Supervisor and Reset ICs, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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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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Contents

README

markdown

STWD100NXWY3F

STMicroelectronics · Supervisor and Reset ICs · SOT-23-5

STWD100NXWY3F 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. Open-drain configuration on this NXWY3F variant (letter 'N' in the ordering code). Requires an external pull-up resistor to any supply voltage up to 6 V; a 10 kΩ pull-up is sufficient in most applications. Asserted low when the watchdog timer expires without a WDI trigger.
2 GND power_in Device ground reference.
3 EN input Active-low chip enable. Internal pull-down resistor holds the device enabled when left floating. Driving EN high disables the watchdog and resets internal timing; a positive pulse longer than 1 μs resets the watch. Pulses ≥1 μs are detected; glitches <100 ns are ignored.
4 WDI input Watchdog input. Must be toggled within the watchdog timeout period tWD (102 ms on this X-version device) to clear the internal watchdog timer and prevent WDO from asserting. Pulses ≥1 μs are detected; glitches <100 ns are ignored. On the 'X' version, both low-to-high and high-to-low transitions reset the timer.
5 VCC power_in Positive supply voltage. Watchdog timer starts counting once VCC exceeds the timer startup voltage VSTART (~2.2 V). Typical current consumption is 13 μA.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOT-23-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • STWD100NXWY3FNWWY3F
  • STWD100NXWY3FYNWWY3F
  • STWD100NXWY3FNYWY3F
  • STWD100NXWY3FYNYWY3F
  • STWD100NXWY3FNPWY3F
  • STWD100NXWY3FYNPWY3F
  • STWD100NXWY3F
  • STWD100NXWY3FYNXWY3F
  • STWD100NXWY3FPYW83F

CAD (KiCad official)

  • Symbol: STWD100NXWY3F
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
stwd100nxwy3f.step 85 KB You want the bare part, or you mark your own boards.
stwd100nxwy3f-etched.step 2.1 MB You want the part with STWD100NXWY3F already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 525 faces against 102 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: STMicroelectronics datasheet (20 pp, sha256 2ec54876f17739de, 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