component
SWT18N50D
Public Made by Adomby adom
Samwin MOSFETs, TO-247. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSWT18N50D
Samwin · MOSFETs · TO-247
SWT18N50D from Samwin, in a TO-247. 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 to source voltage is rated ±30 V (VGS). |
| 2 | Drain | passive | Drain to source voltage is rated 500 V and continuous drain current is 18 A at TC=25oC, limited by junction temperature. |
| 3 | Source | passive | Source is the terminal of the integral reverse p-n junction diode, with continuous source current rated 18 A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Samwin |
| Package | TO-247 |
| 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 to source voltage | VDSS | 500 | V | 1 | |||
| Continuous drain current (TC=25C) | ID | 18 | A | TC=25C; drain current limited by junction temperature | 1 | ||
| Continuous drain current (TC=100C) | ID | 11 | A | TC=100C; drain current limited by junction temperature | 1 | ||
| Drain current pulsed | IDM | 72 | A | note 1 | 1 | ||
| Gate to source voltage | VGS | -30 | 30 | V | 1 | ||
| Single pulsed avalanche energy | EAS | 991 | mJ | note 2 | 1 | ||
| Repetitive avalanche energy | EAR | 52 | mJ | note 1 | 1 | ||
| Peak diode recovery dv/dt | dv/dt | 5 | V/ns | note 3 | 1 | ||
| Total power dissipation (TO-247) | PD | 312.5 | W | TC=25C | 1 | ||
| Derating factor above 25C (TO-247) | PD | 2.5 | W/oC | above 25oC | 1 | ||
| Operating junction and storage temperature | TSTG, TJ | -55 | 150 | oC | 1 | ||
| Maximum lead temperature for soldering | TL | 300 | oC | 1/8 from case for 5 seconds | 1 | ||
| Thermal resistance, junction to case (TO-247) | Rthjc | 0.4 | oC/W | 1 | |||
| Thermal resistance, junction to ambient (TO-247) | Rthja | 38 | oC/W | 1 | |||
| Drain to source breakdown voltage | BVDSS | 500 | V | VGS=0V, ID=250uA | 2 | ||
| Breakdown voltage temperature coefficient | ΔBVDSS/ΔTJ | 0.54 | V/oC | ID=250uA, referenced to 25oC | 2 | ||
| Drain to source leakage current | IDSS | 1 | uA | VDS=500V, VGS=0V | 2 | ||
| Drain to source leakage current at 125C | IDSS | 50 | uA | VDS=400V, TC=125oC | 2 | ||
| Gate to source leakage current, forward | IGSS | 100 | nA | VGS=30V, VDS=0V | 2 | ||
| Gate to source leakage current, reverse | IGSS | -100 | nA | VGS=-30V, VDS=0V | 2 | ||
| Gate threshold voltage | VGS(TH) | 2.5 | 4.5 | V | VDS=VGS, ID=250uA | 2 | |
| Drain to source on state resistance | RDS(ON) | 0.24 | 0.3 | Ω | VGS=10V, ID=9A | 2 | |
| Gate resistance | Rg | 1.1 | Ω | VDS=0V, Scan F mode | 2 |
CAD (KiCad official)
- Symbol:
SWT18N50D - Footprint:
Package_TO_SOT_THT:TO-247-3_Vertical - 3D model: TO-247 (KiCad packages3D, STEP)
- 3D model files:
swt18n50d-etched.step/swt18n50d-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);swt18n50d.step/swt18n50d.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Samwin datasheet (6 pp, sha256
d0dd1ef9cfb850d8, retrieved 2026-10-27, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).