# ESD0502B-HXY

**HXY MOSFET** · TVS · SOT-523

ESD0502B-HXY from HXY MOSFET, in a SOT-523. 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 | IO1 | passive | Protected line 1 connects to a unidirectional TVS diode with VRWM 5 V max, VBR 6 V min at 1 mA, VC 25 V max at IPP 4 A and 0.5 pF typ capacitance. |
| 2 | IO2 | passive | Protected line 2 connects to a unidirectional TVS diode with VRWM 5 V max, VBR 6 V min at 1 mA, VC 25 V max at IPP 4 A and 0.5 pF typ capacitance. |
| 3 | GND | power_in | Common node of the two unidirectional TVS diodes, taken as the ground reference, with IEC61000-4-2 protection of ±15 kV air and ±8 kV contact discharge. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HXY MOSFET |
| Package | SOT-523 |
| Category | TVS/Fuse/Board Level Protection |
| Pins | 3 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Peak Pulse Power (tp = 8/20μs) | PPP |  |  | 100 | W | tp = 8/20μs, Tamb=25°C | 1 |
| Storage Temperature Range | Tstg | -55 |  | 150 | °C |  | 1 |
| Operating Temperature Range | Top | -40 |  | 125 | °C |  | 1 |
| Maximum junction temperature | Tj |  |  | 150 | °C |  | 1 |
| Maximum lead temperature for soldering | TL |  |  | 260 | °C | during 10s | 1 |
| IEC61000-4-2 (ESD) air discharge |  | -15 |  | 15 | KV | IEC61000-4-2, air discharge | 1 |
| IEC61000-4-2 (ESD) contact discharge |  | -8 |  | 8 | KV | IEC61000-4-2, contact discharge | 1 |
| Reverse working voltage | VRWM |  |  | 5 | V |  | 2 |
| Breakdown voltage | VBR | 6 |  |  | V | IT = 1 mA, pulse test (Note 1), 25°C | 2 |
| Reverse leakage current | IR |  |  | 0.5 | uA | @ VRWM | 2 |
| Clamping voltage | VC |  |  | 25 | V | @ IPP = 4 A (Max IPP) | 2 |
| Device capacitance | C |  |  | 0.5 | pF |  | 2 |

## CAD (KiCad official)

- Symbol: `ESD0502B-HXY`
- Footprint: `Package_TO_SOT_SMD:SOT-523`
- 3D model: SOT-523, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.8 mm nominal SOT-523 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `esd0502b-hxy-etched.step` / `esd0502b-hxy-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `esd0502b-hxy.step` / `esd0502b-hxy.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HXY MOSFET datasheet](docs/esd0502b-hxy-datasheet.pdf) (4 pp, sha256 `1ec5372883e2b39b`, retrieved 2026-11-05, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/esd0502b-hxy-datasheet.pdf)