# SMF40A-TP

**MCC(Micro Commercial Components)** · TVS · SOD-123FL

SMF40A-TP from MCC(Micro Commercial Components), in a SOD-123FL. 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 | Cathode | passive | Cathode of the unidirectional TVS (marked with the cathode mark band); connects to the protected line, with VWM 40V, breakdown 44.4V min to 49.1V max at 1mA, and max clamping voltage 64.5V at 3.1A IPP. |
| 2 | Anode | passive | Anode of the unidirectional TVS; connects to ground/return side of the protected line, rated for 200W peak pulse power (10/1000μs). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MCC(Micro Commercial Components) |
| Package | SOD-123FL |
| Category | TVS/Fuse/Board Level Protection |
| Pins | 2 |

## 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 | VBR | 44.4 |  | 49.1 | V | IT = 1.0 mA | 2 |
| Reverse Stand-Off Voltage | VWM |  | 40 |  | V |  | 2 |
| Max. Clamping Voltage | VC |  |  | 64.5 | V | @IPP = 3.1 A | 2 |
| Max. Peak Pulse Current | IPP |  |  | 3.1 | A |  | 2 |
| Max. Reverse Leakage Current | ID |  |  | 1 | µA | @VWM = 40 V | 2 |
| Test Current | IT |  | 1 |  | mA |  | 2 |
| Peak Pulse Power Dissipation | PPP |  |  | 200 | W | 10/1000μs waveform | 1 |
| Peak forward surge current | IFSM |  |  | 30 | A | 8.3 ms single half sine-wave | 1 |
| ESD Voltage (HBM) | VESD | 16 |  |  | KV | HBM | 1 |
| IEC61000-4-2 ESD Air |  | -30 |  | 30 | KV | Air | 1 |
| IEC61000-4-2 ESD Contact |  | -30 |  | 30 | KV | Contact | 1 |
| Operating Junction Temperature Range | TJ | -65 |  | 175 | °C |  | 1 |
| Storage Temperature Range | TSTG | -65 |  | 175 | °C |  | 1 |
| Typical Thermal Resistance Junction to Lead | RθJL |  | 26 |  | °C/W | Junction to Lead | 1 |
| Typical Thermal Resistance Junction to Ambient | RθJA |  | 300 |  | °C/W | Junction to Ambient | 1 |

## CAD (KiCad official)

- Symbol: `SMF40A-TP`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123FL (KiCad packages3D, STEP)
- 3D model files: `smf40a-tp-etched.step` / `smf40a-tp-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smf40a-tp.step` / `smf40a-tp.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MCC(Micro Commercial Components) datasheet](docs/smf40a-tp-datasheet.pdf) (5 pp, sha256 `c4100e793386d984`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/smf40a-tp-datasheet.pdf)