# ESD0502EQ

**Yangzhou Yangjie Elec Tech** · ESD And Surge Protection (TVS/ESD) · SOT-23

ESD0502EQ from Yangzhou Yangjie Elec Tech, in a SOT-23. 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 | Protected line 1 (diode cathode), 5V reverse stand-off (VRWM) with IEC61000-4-2 protection of ±30kV contact and ±30kV air, clamping to ground via the common pin. |
| 2 | I/O2 | passive | Protected line 2 (diode cathode), 5V reverse stand-off (VRWM) with IEC61000-4-2 protection of ±30kV contact and ±30kV air, clamping to ground via the common pin. |
| 3 | GND | power_in | Common anode of both diodes, connected to ground as the reference for the two uni-directional protected lines (RDYN is specified I/O to Ground). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | SOT-23 |
| Category | Circuit 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) | Ppk |  |  | 300 | W | tp = 8/20μs | 2 |
| ESD according to IEC61000-4-2 air discharge | VESD | -30 |  | 30 | KV | IEC61000-4-2 air discharge | 2 |
| ESD according to IEC61000-4-2 contact discharge |  | -30 |  | 30 | KV | IEC61000-4-2 contact discharge | 2 |
| Junction temperature | TJ | -55 |  | 150 | ℃ |  | 2 |
| Storage temperature | TSTG | -55 |  | 150 | ℃ |  | 2 |
| Reverse breakdown voltage | VBR | 6.2 | 7.5 |  | V | IBR = 1mA | 2 |
| Reverse Standoff Voltage | VRWM |  | 5 |  | V | IR≤1μA | 2 |
| Reverse leakage current | IR |  | 1 |  | μA | VRWM = 5V | 2 |
| Forward Voltage | VF |  | 1.1 |  | V | IF=10mA | 2 |
| Clamping voltage | VC |  | 9 |  | V | IPP = 5A, tp = 8/20μs | 2 |
| Clamping voltage | VC |  | 12 |  | V | IPP = 15A, tp = 8/20μs | 2 |
| Clamping voltage | VC |  | 15 |  | V | IPP = 20A, tp = 8/20μs | 2 |
| Dynamic resistance | RDYN |  | 0.089 |  | Ω | TLP, tp=100ns, I/O to Ground | 2 |
| Peak Pulse Current | IPP |  | 20 |  | A | tp = 8/20μs | 2 |
| Junction capacitance | CJ |  | 140 | 160 | pF | VR = 0V, f = 1MHz | 2 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing |  | black | 3. Body color: Black | 4 |
| contacts |  | tin | ● Lead Finish: Matte Tin ● Case Material: “Green” Molding Compound | 1 |

## CAD (KiCad official)

- Symbol: `ESD0502EQ`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `esd0502eq-etched.step` / `esd0502eq-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `esd0502eq.step` / `esd0502eq.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603373540201164800) (5 pp, sha256 `ea095f2792771081`, retrieved 2026-10-21, 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/esd0502eq-datasheet.pdf)