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STMicroelectronics STP78N75F4 — Discrete Semiconductors

STP78N75F4 N-Channel MOSFET, 75V, 78A, TO-220, Obsolete

MPNSTP78N75F4
Obsolete

STMicroelectronics DeepGATE™, STripFET™ series, N-Channel MOSFET, 75 V Drain-Source Voltage, 78 A Continuous Drain Current, 11 mOhm Rds(on) at 39 A, 10 V, TO-220-3 Through Hole, -55°C to 175°C Junction Temperature.

$0.9700Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STP78N75F4 specifications
ParameterValue
SeriesDeepGATE™, STripFET™
FET typeN-Channel
MountingThrough Hole
Drain to source voltage75 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C78A (Tc)
Power dissipation150W (Tc)
Operating temperature-55°C ~ 175°C (TJ)
PackageTube
Vgs±20V
TechnologyMOSFET (Metal Oxide)
CaseTO-220-3
Vgs(th) (Max) @ id4V @ 250µA
Rds on (Max) @ id, vgs11mOhm @ 39A, 10V
Gate charge (Qg) (Max) @ vgs76 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds5015 pF @ 25 V

Product details

The 76 nC total gate charge at 10 V is moderate — a typical gate-driver IC with 1 A to 2 A peak source/sink will switch it in the tens of nanoseconds, but the 5015 pF input capacitance at 25 V drain-source means the driver's output impedance and the gate-loop inductance matter for clean edges and ringing control.

For a production BOM that already uses this part, the path is either last-time-buy inventory still in the channel (sealed reels with consistent date-codes are the cleanest source) or a qualified replacement from the same function class — same TO-220 footprint, similar Rds(on) and voltage rating. A buyer sourcing this today is working the surplus and independent distribution channel, not the factory-authorized pipeline.

Thermal and mounting — the TO-220 tab is the heat path

Through-hole mounting is straightforward for a rework or proto run, but for volume production the same function in a D²PAK or TO-263 surface-mount variant might save a wave-solder step.

Frequently asked questions

Where can I buy the STP78N75F4?

The STP78N75F4 is obsolete and sourced through independent distribution. It is available to order against an RFQ — submit a request for current availability and pricing. No stock or price figures are published here.

Is the STP78N75F4 obsolete?

Yes, STMicroelectronics lists the product status as obsolete. There is no official replacement part number from ST. For a production BOM, the best path is surplus inventory with consistent date-codes or a functionally equivalent MOSFET from another manufacturer in the same TO-220 footprint.

What is the Rds(on) of the STP78N75F4?

This is the figure to use for worst-case conduction loss calculations in the power stage.