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STMicroelectronics STP9NK65Z — Discrete Semiconductors

STP9NK65Z N-Channel MOSFET, 650 V, 6.4 A, TO-220

MPNSTP9NK65Z
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STMicroelectronics SuperMESH™ series, STP9NK65Z, N-Channel MOSFET, 650 V drain-source, 6.4 A continuous drain at 25°C, 1.2 Ohm Rds(on) at 10 V, TO-220-3 through-hole package, -55°C to 150°C junction temperature.

$1.7537Ref. price · indicative, final on quote
STMicroelectronics STP9NK65Z datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STP9NK65Z specifications
ParameterValue
SeriesSuperMESH™
FET typeN-Channel
MountingThrough Hole
Drain to source voltage650 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C6.4A (Tc)
Power dissipation125W (Tc)
Operating temperature-55°C~150°C(TJ)
PackageTube
Vgs±30V
TechnologyMOSFET (Metal Oxide)
CaseTO-220-3
Vgs(th) (Max) @ id4.5V @ 100µA
Rds on (Max) @ id, vgs1.2Ohm @ 3.2A, 10V
Gate charge (Qg) (Max) @ vgs41 nC @ 10 V
Input capacitance (Ciss) (Max) @ vds1145 pF @ 25 V

Product details

650 V N-channel MOSFET for offline power conversion

The 1.2 Ohm maximum Rds(on) at 10 V gate drive defines the conduction loss for a given load current, and the 125 W power dissipation ceiling in the TO-220 package sets the thermal budget for heatsink selection.

Gate drive and switching behaviour

Gate charge is 41 nC at 10 V, a moderate figure that a standard PWM controller or driver IC can handle without excessive drive losses. Input capacitance measures 1145 pF at 25 V drain-source, which influences the switching speed and the gate-driver's peak current requirement. For designs targeting hard-switched topologies above 100 kHz, the gate charge and capacitance numbers should be factored into the driver selection and dead-time calculation.

The TO-220 through-hole package suits designs where a heatsink is bolted to the tab for thermal management; the package's lead form is compatible with standard PCB layouts and chassis-mount approaches.

For volume commitments or dual-source qualification, the base product number STP9NK65 covers the family, and the Z suffix denotes the SuperMESH™ generation.

Frequently asked questions

What is the equivalent or replacement for the STP9NK65Z?

The STP9NK65Z is part of the STP9NK65 base product family. Within the same SuperMESH™ series, the STP9NK60Z is a 600 V variant; the STP9NK65Z's 650 V rating provides additional voltage margin. For a drop-in replacement, verify the specific voltage and Rds(on) requirements against the STP9NK65Z's 650 V, 1.2 Ohm specs.