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STMicroelectronics STP18N55M5 — Discrete Semiconductors

STP18N55M5 MOSFET N-CH 550V 16A TO-220-3 MDmesh V

MPNSTP18N55M5
Active

STMicroelectronics MDmesh V series, STP18N55M5, N-Channel MOSFET, 550V Vdss, 16A Id, 192mOhm Rds(on) @ 8A 10V, 31nC Qg, TO-220-3 through hole, 150°C Tj.

$3.1000Ref. price · indicative, final on quote
STMicroelectronics STP18N55M5 datasheet (PDF)
PackagingTO-220-3
RoHSROHS3 Compliant
SeriesMDmesh™ V
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STP18N55M5 specifications
ParameterValue
SeriesMDmesh™ V
FET typeN-Channel
MountingThrough Hole
Drain to source voltage550 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C16A (Tc)
Power dissipation110W (Tc)
Operating temperature150°C (TJ)
PackageTube
Vgs±25V
TechnologyMOSFET (Metal Oxide)
CaseTO-220-3
Vgs(th) (Max) @ id5V @ 250µA
Rds on (Max) @ id, vgs192mOhm @ 8A, 10V
Gate charge (Qg) (Max) @ vgs31 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds1260 pF @ 100 V

Product details

The STP18N55M5: The 550 V Vdss suits offline flyback converters, PFC boost stages, and two-switch forward topologies. Maximum Rds(on) is 192 mOhm at 8 A, 10 V gate drive. The 110 W Tc-rated dissipation can handle conduction loss with a heatsink.

Capacitance and switching loss — the 1260 pF Ciss at 100 V

Input capacitance is 1260 pF at 100 V drain-source — a moderate figure that keeps the Miller plateau short and the turn-on/turn-off delay within a few tens of nanoseconds with a standard 10-ohm gate resistor.

Package and mounting — TO-220-3 for heatsink attachment

The ±25 V maximum gate-source rating gives margin for gate-drive ringing in a hard-switched topology.

Lifecycle and procurement reality

The device is RoHS3 compliant.

Frequently asked questions

Is STP18N55M5 obsolete or still active?

Determines whether the part can be sourced long-term without redesign.

Where can I buy STP18N55M5 in stock?

Immediate purchasing decision; buyers need to know authorized distributors with available inventory.

What is the best replacement for STP18N55M5?

When the part is unavailable, engineers and buyers need drop-in or equivalent substitutes.

What is the datasheet for STP18N55M5?

Design engineers need to verify electrical parameters, package, and thermal data for simulation and PCB layout.

What is the price of STP18N55M5?

Cost affects BOM budgeting and sourcing decisions.

What is the pinout of STP18N55M5?

Maintenance techs and engineers need correct connection for replacement or prototyping.