# OSP18N20

**OSEN** · MOSFETs · TO-220

OSP18N20 from OSEN, in a TO-220. 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 | Gate | input | Gate terminal with VGS rated ±20 V continuous and threshold voltage of 2.0 V min to 4.0 V max at VDS=VGS, ID=250µA. |
| 2 | Drain | passive | Drain terminal rated for VDSS of 200 V, continuous drain current of 18 A and pulsed drain current of 72 A. |
| 3 | Source | passive | Source terminal, with continuous body-diode forward current of 18 A and diode forward voltage of 1.4 V max at IS=9A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | OSEN |
| Package | TO-220 |
| 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 | VDSS |  |  | 200 | V | Tc=25°C | 2 |
| Gate-Source Voltage-Continuous | VGS | -20 |  | 20 | V | Tc=25°C | 2 |
| Drain Current-Continuous (Note 2) | ID |  |  | 18 | A | Tc=25°C | 2 |
| Drain Current-Single Plused (Note 1) | IDM |  |  | 72 | A | Tc=25°C | 2 |
| Power Dissipation (Note 2) | PD |  |  | 125 | W | Tc=25°C | 2 |
| Max. Operating junction temperature | Tj |  |  | 150 | °C | Tc=25°C | 2 |
| Drain-Source Breakdown Voltage | BVDSS | 200 |  |  | V | ID=250µA, VGS=0V, TJ=25°C | 2 |
| Gate Threshold Voltage | VGS(th) | 2 |  | 4 | V | VDS=VGS, ID=250μA | 2 |
| Drain-Source On-Resistance | RDS(on) |  | 0.15 | 0.2 | Ω | VGS=10V, ID=9A | 2 |
| Gate-Body Leakage Current | IGSS | -100 |  | 100 | nA | VGS=±20V, VDS=0 | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 1 | μA | VDS=200V, VGS=0 | 2 |
| Forward Transconductance | gfs | 3 | 4 |  | S | VDS=25V, ID=5A | 2 |
| Continuous Drain-Source Diode Forward Current (Note 2) | IS |  |  | 18 | A |  | 3 |
| Diode Forward On-Voltage | VSD |  |  | 1.4 | V | IS=9A, VGS=0 | 3 |
| Thermal Resistance, Junction to Case | Rth(j-c) |  |  | 1 | ℃/W |  | 3 |

## CAD (KiCad official)

- Symbol: `OSP18N20`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220 (KiCad packages3D, STEP)
- 3D model files: `osp18n20-etched.step` / `osp18n20-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `osp18n20.step` / `osp18n20.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [OSEN datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603366965780639744) (3 pp, sha256 `eced7db396ea0aab`, 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/osp18n20-datasheet.pdf)