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STMicroelectronics STP9NM40N — Discrete Semiconductors

STP9NM40N N-Channel MOSFET, 400 V, 5.6 A, MDmesh II, TO-220

MPNSTP9NM40N
Obsolete

STMicroelectronics MDmesh™ II series, STP9NM40N, N-Channel MOSFET, 400 V Vdss, 5.6 A Id, 790 mOhm Rds(on) @ 2.5 A, 10 V, TO-220-3 through-hole package, 60 W power dissipation.

$1.9000Ref. price · indicative, final on quote
STMicroelectronics STP9NM40N datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STP9NM40N specifications
ParameterValue
SeriesMDmesh™ II
FET typeN-Channel
MountingThrough Hole
Drain to source voltage400 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C5.6A (Tc)
Power dissipation60W (Tc)
Operating temperature150°C(TJ)
PackageTube
Vgs±25V
TechnologyMOSFET (Metal Oxide)
CaseTO-220-3
Vgs(th) (Max) @ id4V @ 250µA
Rds on (Max) @ id, vgs790mOhm @ 2.5A, 10V
Gate charge (Qg) (Max) @ vgs14 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds365 pF @ 50 V

Product details

400 V N-channel MOSFET — MDmesh II in TO-220

It comes in a standard TO-220-3 through-hole package, suitable for offline power supplies, AC-DC converters, and industrial power stages where a 400 V blocking voltage is required.

790 mOhm on-resistance — conduction loss budget

This is the figure to use for worst-case conduction loss calculations in the thermal design.

Gate charge and input capacitance — switching speed

These are moderate figures for a 400 V device — the gate drive power requirement is low, and the switching losses in a hard-switched converter at frequencies up to 100 kHz are manageable.

Frequently asked questions

What is the equivalent part for STP9NM40N?

A cross-reference search within the MDmesh II or MDmesh V series in the same TO-220-3 package with a 400 V Vdss and similar Rds(on) and current rating is the recommended approach for a pin-compatible replacement. The 790 mOhm on-resistance at 2.5 A and 5.6 A continuous drain current are the key parametric targets.

Where can I find the STP9NM40N datasheet?

The STP9NM40N datasheet is available from STMicroelectronics' website under the base product number STP9N. The full specifications including switching characteristics, safe operating area curves, and thermal data are in that document.