Specs side by side
2 parts compared · 14 differing specs across 14 total parameters.
| Parameter | ||
|---|---|---|
| Supply voltage | - | Same 500V and gate ratings; the difference is mounting and dissipation. |
| Memory & Peripherals | - | Where it earns its keep: dense boards and stacked heatsinks where the isolation washer was a production nuisance or a failure point of its own - and where the load fits the reduced current class. |
| Case | TO-220AB (IRFI versions: TO-220 FullPak) | TO-220 FullPak (isolated tab) |
| Compatibility Level | - | Functional Equivalent |
| Component Category | N-Channel Power MOSFETs | - |
| Core & Architecture | - | The fully-isolated versions: the plastic FullPak body removes the mica and the isolation kit from the thermal path - and the insulation costs current class (about 4.6A for the 840 die, 3.1A for the 830). |
| Firmware Notes | - | The substitution reading: FullPak into the metal-tab socket is easy mounting, tighter thermal margin - check the dissipation math. Metal-tab into a FullPak position adds the insulation job back. |
| Hardware Notes | - | FullPak is taller and requires the movable clip or screw through the hole; the tab is isolated by construction. |
| Lead Time Advantage | - | Shenzhen Spot Stock (24-48h Dispatch) |
| Market Reality | The IRF820/830/840 family is the 500V TO-220 workhorse line of off-line SMPS repair, electronic ballasts and the primary-side switching of a generation of power supplies: same 500V body, same ±20V gates, three current classes - 2.5A at 3 ohms, 4.5A at 1.5 ohms, 8A at 0.85 ohms - plus insulated FullPak variants that trade current for a plastic tab. The substitutions inside the ladder follow one arithmetic (up is free after a gate-charge check, down costs conduction loss), and the drawer trap lives one part number away: the IRFZ44N that sits next to them in every TO-220 bin is a 55-VOLT part from the low-voltage world, and the wrong grab turns a mains supply repair into a fireworks display. | - |
| Reference Part | - | IRF840 |
| Role In Circuit | Original Reference Part | - |
| Sourcing Advantage | - | Stocked; the production-friendliness option. |
| Sourcing Status | Active Shenzhen Spot Sourcing (24–48h) | - |
Parts
- IRF840 · vishay
- IRFI840G / IRFI830G · vishay