# ESD0502T5L

**MDD Microdiode Semiconductor** · ESD And Surge Protection (TVS/ESD) · SOT-523

ESD0502T5L from MDD Microdiode Semiconductor, 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 | I/O1 | passive | Protected high-speed data line 1 (I/O), with 5.0V max reverse working voltage to GND and 0.2pF typical capacitance to I/O 2. |
| 2 | I/O2 | passive | Protected high-speed data line 2 (I/O), with 5.0V max reverse working voltage to GND and 0.2pF typical capacitance to I/O 1. |
| 3 | GND | power_in | Ground reference pin of the TVS/ESD array, to which both I/O lines are clamped (I/O to GND). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MDD Microdiode Semiconductor |
| Package | SOT-523 |
| 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 |
|---|---|---|---|---|---|---|---|
| Total Capacitance (I/O to GND) | CT |  | 0.4 | 0.6 | pF | VR = 0V, f = 1MHz, between I/O and GND | 2 |
| Total Capacitance (I/O to I/O) | CT |  | 0.2 | 0.3 | pF | VR = 0V, f = 1MHz, between I/O and I/O | 2 |
| ESD per IEC 61000-4-2 (Air) | VESD | -20 |  | 20 | kV | ESD per IEC 61000-4-2 (Air) | 1 |
| ESD per IEC 61000-4-2 (Contact) | VESD | -20 |  | 20 | kV | ESD per IEC 61000-4-2 (Contact) | 1 |
| Peak Pulse Power (8/20us) | PPP |  |  | 60 | W | 8/20us | 1 |
| Operating Temperature | TOPT | -55 |  | 125 | °C |  | 1 |
| Storage Temperature | TSTG | -55 |  | 125 | °C |  | 1 |
| Lead Solder Temperature (Maximum) | TL |  |  | 260 | °C | 10 second duration | 1 |

## 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 |
|---|---|---|---|---|
| contacts |  | tin |  Terminal: Matte tin plated.  High temperature soldering guaranted: | 1 |

## CAD (KiCad official)

- Symbol: `ESD0502T5L`
- 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: `esd0502t5l-etched.step` / `esd0502t5l-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `esd0502t5l.step` / `esd0502t5l.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MDD Microdiode Semiconductor datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588886742313549824) (5 pp, sha256 `1cfd4fc824b733dd`, retrieved 2026-10-17, 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/esd0502t5l-datasheet.pdf)