# NCEP0178AK

**Wuxi NCE Power Semiconductor** · MOSFETs · TO-252-2L

NCEP0178AK from Wuxi NCE Power Semiconductor, in a TO-252-2L. 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; gate-source voltage limited to ±20 V with threshold of 1.2 V min to 2.2 V max at ID=250μA. |
| 2 | D | passive | Drain (center pin, also connected to the tab); VDS 100 V max and continuous ID 78 A. |
| 3 | S | passive | Source; continuous diode forward current IS of 78 A max. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Wuxi NCE Power Semiconductor |
| Package | TO-252-2L |
| Category | Transistors/Thyristors |
| 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 |  |  | 100 | V |  | 1 |
| Gate-Source Voltage | VGS | -20 |  | 20 | V |  | 1 |
| Drain Current-Continuous | ID |  |  | 78 | A | TC=25℃ unless otherwise noted | 1 |
| Drain Current-Continuous | ID (100℃) |  |  | 60 | A | TC=100℃ | 1 |
| Pulsed Drain Current | IDM |  |  | 320 | A |  | 1 |
| Maximum Power Dissipation | PD |  |  | 125 | W |  | 1 |
| Single pulse avalanche energy | EAS |  |  | 320 | mJ | Note 5: Tj=25℃, VDD=50V, VG=10V, L=0.5mH, Rg=25Ω | 1 |
| Operating Junction and Storage Temperature Range | TJ,TSTG | -55 |  | 175 | ℃ |  | 1 |
| Thermal Resistance, Junction-to-Case | RθJC |  |  | 1.2 | ℃/W | Note 2 | 2 |
| Drain-Source Breakdown Voltage | BVDSS | 100 |  |  | V | VGS=0V ID=250μA | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 1 | μA | VDS=100V,VGS=0V | 2 |
| Gate-Body Leakage Current | IGSS | -100 |  | 100 | nA | VGS=±20V,VDS=0V | 2 |
| Gate Threshold Voltage | VGS(th) | 1.2 | 1.7 | 2.2 | V | VDS=VGS,ID=250μA | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 7.2 | 8.5 | mΩ | VGS=10V, ID=39A | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 9.5 | 12 | mΩ | VGS=4.5V, ID=39A | 2 |
| Forward Transconductance | gFS | 40 |  |  | S | VDS=10V,ID=39A | 2 |
| Input Capacitance | Clss |  | 4200 | 5480 | pF |  | 2 |
| Output Capacitance | Coss |  | 354 | 425 | pF |  | 2 |
| Reverse Transfer Capacitance | Crss |  | 23 | 30 | pF | VDS=50V,VGS=0V, F=1.0MHz | 2 |
| Diode Forward Voltage | VSD |  |  | 1.2 | V | VGS=0V,IS=78A | 2 |
| Diode Forward Current | IS |  |  | 78 | A |  | 2 |

## CAD (KiCad official)

- Symbol: `NCEP0178AK`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252-2L (KiCad packages3D, STEP)
- 3D model files: `ncep0178ak-etched.step` / `ncep0178ak-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ncep0178ak.step` / `ncep0178ak.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Wuxi NCE Power Semiconductor datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884621630558208) (7 pp, sha256 `54c43c437bbebfc3`, retrieved 2026-10-09, 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/ncep0178ak-datasheet.pdf)