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STMicroelectronics STFI20NM65N — Discrete Semiconductors

STFI20NM65N N-Channel MOSFET, 650 V, 15 A, MDmesh II

MPNSTFI20NM65N
Obsolete

STMicroelectronics MDmesh™ II series, N-Channel MOSFET, 650 V drain-source, 15 A continuous drain at 25°C, 270 mOhm Rds(on) at 10 V, 44 nC gate charge, through-hole TO-262-3 full-pack (I2PAKFP), 150°C junction temperature.

$4.7900Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STFI20NM65N specifications
ParameterValue
SeriesMDmesh™ II
FET typeN-Channel
MountingThrough Hole
Drain to source voltage650 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C15A (Tc)
Power dissipation30W (Tc)
Operating temperature150°C (TJ)
PackageTube
Vgs±25V
TechnologyMOSFET (Metal Oxide)
CaseTO-262-3 Full Pack, I²Pak
Vgs(th) (Max) @ id4V @ 250µA
Rds on (Max) @ id, vgs270mOhm @ 7.5A, 10V
Gate charge (Qg) (Max) @ vgs44 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds1280 pF @ 50 V

Product details

650 V, 15 A N-channel in a full-pack through-hole

This part targets offline switch-mode power supplies, PFC stages, and lighting ballasts where the full-pack package simplifies assembly and cuts BOM cost on isolation hardware.

That 10 V drive level is the recommended gate voltage for minimum on-resistance — the gate threshold is 4 V max at 250 µA, so a standard 12 V or 15 V gate-drive rail from a PWM controller or driver IC will fully enhance the channel.

Full-pack package — no isolation washer needed

The I2PAKFP (TO-281) full-pack moulding completely encapsulates the die attach pad, so the exposed surface is plastic, not metal. That means the device can be bolted directly to a grounded heatsink without a silicone pad or mica washer — saves assembly time and removes one thermal interface from the stack. The trade-off is higher thermal resistance compared to a standard TO-220 with an insulating kit; the 30 W power dissipation limit at case temperature reflects that. For a 15 A continuous rating, the designer should model junction temperature rise at the expected load current and switching frequency.

A buyer holding a production requirement should qualify an alternative — the closest functional match within the MDmesh family will be a 650 V, 15 A class N-channel MOSFET in a through-hole full-pack or isolated TO-220 package, but pin-compatibility and gate-drive thresholds must be verified against the specific application.

Frequently asked questions

What is the replacement for STFI20NM65N?

The closest functional replacement would be a 650 V, 15 A class N-channel MOSFET in a through-hole full-pack or isolated TO-220 package from the same MDmesh family or a comparable vendor. Verify pinout, gate-threshold voltage, and on-resistance against your specific circuit before substituting.