# CMD40N20

**Cmos** · MOSFETs · TO-252

CMD40N20 from Cmos, in a TO-252. 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 | G | input | Gate; controls the channel, with VGS rated ±25 V maximum and threshold of 3 V to 5 V at VDS=VGS, ID=250uA. |
| 2 | D | passive | Drain (also the metal tab); rated 200 V VDS maximum and 40 A continuous at TC=25℃. |
| 3 | S | passive | Source; connects to the body diode anode, with continuous source current up to 40 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Cmos |
| Package | TO-252 |
| Category | Triode/MOS Tube/Transistor |
| 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 |
|---|---|---|---|---|---|---|---|
| Drain-Source Voltage | VDS |  |  | 200 | V |  | 1 |
| Gate-Source Voltage | VGS | -25 |  | 25 | V |  | 1 |
| Continuous Drain Current | ID@TC=25℃ |  |  | 40 | A |  | 1 |
| Continuous Drain Current | ID@TC=100℃ |  |  | 32 | A |  | 1 |
| Pulsed Drain Current | IDM |  |  | 120 | A |  | 1 |
| Single Pulse Avalanche Energy | EAS |  |  | 358 | mJ | Note 1: VDD=50V,VGS=10V,L=0.5mH,ID=42A | 1 |
| Total Power Dissipation | PD@TC=25℃ |  |  | 135 | W |  | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Operating Junction Temperature Range | TJ | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance Junction-ambient | RθJA |  |  | 62 | ℃/ W |  | 1 |
| Thermal Resistance Junction-Case | RθJC |  |  | 1.2 | ℃/ W |  | 1 |
| Drain-Source Breakdown Voltage | BVDSS | 200 |  |  | V | VGS=0V , ID=250uA | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  |  | 60 | mΩ | VGS=10V , ID=20A | 2 |
| Gate Threshold Voltage | VGS(th) | 3 |  | 5 | V | VGS=VDS , ID =250uA | 2 |
| Drain-Source Leakage Current | IDSS |  |  | 1 | uA | VDS=200V, VGS=0V | 2 |
| Gate-Source Leakage Current | IGSS | -100 |  | 100 | nA | VGS ±25V , VDS=0V | 2 |
| Continuous Source Current | IS |  |  | 40 | A | VG=VD=0V , Force Current | 2 |
| Diode Forward Voltage | VSD |  |  | 1.2 | V | VGS=0V , IS=28A , TJ=25℃ | 2 |

## CAD (KiCad official)

- Symbol: `CMD40N20`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252 (KiCad packages3D, STEP)
- 3D model files: `cmd40n20-etched.step` / `cmd40n20-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cmd40n20.step` / `cmd40n20.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Cmos datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589839230714347520) (2 pp, sha256 `243d75232202271a`, retrieved 2026-10-18, 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/cmd40n20-datasheet.pdf)