# ESDA37WY

**STMicroelectronics** · ESD And Surge Protection (TVS/ESD) · SOT-323-3

ESDA37WY from STMicroelectronics, in a SOT-323-3. 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 | I/O1 | passive | ESD protection cathode 1 of the dual-line unidirectional TVS; for ESDA37WY the minimum breakdown voltage VBR is 36 V and the maximum leakage IRM is 0.1 µA. |
| 2 | I/O2 | passive | ESD protection cathode 2 of the dual-line unidirectional TVS; for ESDA37WY the minimum breakdown voltage VBR is 36 V and the maximum leakage IRM is 0.1 µA. |
| 3 | GND | power_in | Common anode of both protection diodes, to be connected to ground; forward conduction runs from GND to the I/O pins. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SOT-323-3 |
| Category | Circuit Protection |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `ESDA37WY`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323-3 (KiCad packages3D, STEP)
- 3D model files: `esda37wy-etched.step` / `esda37wy-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `esda37wy.step` / `esda37wy.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/esda37wy.pdf) (18 pp, sha256 `5a58bc16bd84527f`, retrieved 2026-10-13, 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/esda37wy-datasheet.pdf)