# MSSR05.TCT

**MSKSEMI** · ESD And Surge Protection (TVS/ESD) · SOT-143

MSSR05.TCT from MSKSEMI, in a SOT-143. 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 | GND | power_in | Ground reference at the anode of the internal 5V zener TVS diode, shared by the lower steering diodes (marked pin-1 dot corner). |
| 2 | IO2 | passive | Protected line connected to the mid-point of one steering-diode pair, clamped for ±30kV IEC 61000-4-2 ESD with 1.2pF typical capacitance and 5V working voltage. |
| 3 | IO1 | passive | Protected line connected to the mid-point of the other steering-diode pair, clamped for ±30kV IEC 61000-4-2 ESD with 1.2pF typical capacitance and 5V working voltage. |
| 4 | VCC | power_in | Upper rail connected to the cathode of the internal 5V zener TVS diode, with a stated working voltage VRWM of 5V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | SOT-143 |
| Category | Circuit Protection |
| Pins | 4 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Breakdown voltage (min) | VBR | 6 |  |  | V | IT = 1 mA | 3 |
| Clamping voltage (max) | VC |  |  | 23 | V | @A column = 3 (as printed) | 3 |
| Clamping voltage (typ) | VC |  | 9.8 |  | V | VC @1A | 3 |
| Reverse leakage current (max) | IR |  |  | 1 | μA |  | 3 |
| Reverse stand-off voltage | VRWM |  | 5 |  | V |  | 3 |
| Capacitance (typ) | C |  | 1.2 |  | pF |  | 3 |
| Peak pulse power (8/20µs) | Ppp |  |  | 300 | W | 8/20 µs | 2 |
| ESD per IEC 61000-4-2 (Air) | VESD | -30 |  | 30 | kV | IEC 61000-4-2 (Air) | 2 |
| ESD per IEC 61000-4-2 (Contact) | VESD | -30 |  | 30 | kV | IEC 61000-4-2 (Contact) | 2 |
| Operating temperature range | TJ | -55 |  | 125 | ℃ |  | 2 |
| Storage temperature range | TSTJ | -55 |  | 150 | ℃ |  | 2 |

## CAD (KiCad official)

- Symbol: `MSSR05.TCT`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files: `mssr05-tct-etched.step` / `mssr05-tct-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mssr05-tct.step` / `mssr05-tct.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590182490813476864) (5 pp, sha256 `9229346a6d6d9ee0`, 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/mssr05-tct-datasheet.pdf)