STMicroelectronics STF9NK60ZD

Overview

STF9NK60ZD from STMicroelectronics is an N-channel SuperFREDMesh™ power MOSFET rated for 600 V drain-source voltage, <0.95 Ω R_DS(on) at V_GS = 10 V and 3.5 A, 7 A continuous drain current (T_C = 25 °C), and 30 W total dissipation in TO-220FP package. It integrates a fast body-drain diode with 130 ns reverse recovery time and is 100% avalanche tested for robust switching in offline SMPS.

For engineers reviewing the STF9NK60ZD datasheet, STF9NK60ZD pinout, STF9NK60ZD application, or STF9NK60ZD equivalent, key selection criteria include its 15 V/ns dv/dt capability, gate charge of 41 nC (typ), low C_oss of 135 pF, Zener-protected gate (±30 V rating), and thermal resistance of 4.16 °C/W junction-to-case - all critical for high-reliability flyback and PFC stages.

Technical Context

This MOSFET employs ST's SuperFREDMesh™ process, combining reduced on-resistance with intrinsic Zener gate protection and enhanced dv/dt immunity. Its internal fast recovery diode exhibits 1.6 V forward voltage at 7 A and 8.4 nC reverse recovery charge under standard test conditions (di/dt = 100 A/µs).

The device operates across –55 to 150 °C junction temperature range and supports unclamped inductive switching with 235 mJ single-pulse avalanche energy. Its 41 nC total gate charge and 21 nC Q_gd enable efficient hard-switching control with moderate gate drive strength.

Key Specifications

Pinout & Package

STF9NK60ZD uses the TO-220FP (Full-Pak) package: insulated plastic case with integral heat sink tab, 3-pin vertical mounting, no metal tab isolation required. Thermal resistance R_thj-case = 4.16 °C/W enables direct PCB-mount thermal transfer without additional insulators.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage power switching applications.

Compared with STP9NK60ZD, STF9NK60ZD trades thermal headroom (30 W vs 125 W) for electrical isolation and compact footprint; versus FQP9N60CT, it delivers superior ruggedness via built-in Zener clamping and faster diode recovery - critical for certified industrial power supplies.

Availability

STF9NK60ZD is available at Aetrix Electronics and suitable for AC-DC adapters, flyback converters, PFC boost stages, and industrial motor starters requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for STF9NK60ZD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

This device belongs to ST's SuperFREDMesh™ power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline switching applications where fast diode recovery, avalanche ruggedness, and gate protection are mandatory.

FAQ

What is the maximum safe operating temperature for STF9NK60ZD?

The STF9NK60ZD has a specified operating junction temperature range of –55 °C to +150 °C. Its TO-220FP package achieves 4.16 °C/W junction-to-case thermal resistance, so sustained operation at 150 °C requires case temperature ≤110 °C with appropriate heatsinking and airflow. Derating begins at T_C > 25 °C per the 0.24 W/°C factor in Table 2.

Does STF9NK60ZD require an external gate resistor?

Yes - a gate resistor is required to control dV/dt and prevent oscillation. With 41 nC total gate charge and typical driver output impedance, a 4.7 Ω resistor provides optimal trade-off between switching speed (td(on) = 11.4 ns) and EMI suppression. Lower values increase peak gate current and risk ringing; higher values slow switching and raise losses.

Can STF9NK60ZD replace STP9NK60ZD in existing designs?

No direct drop-in replacement: STF9NK60ZD uses TO-220FP (insulated tab), while STP9NK60ZD uses standard TO-220 (conductive tab). Mechanical mounting, thermal interface, and creepage/clearance must be revalidated. Electrical specs match closely, but thermal design must account for 30 W vs 125 W power dissipation limits.

Is the body diode suitable for synchronous rectification?

No - the integrated SuperFREDMesh™ diode is optimized for fast recovery in hard-switched topologies (e.g., flyback snubberless operation), not low-V_F conduction. Its 1.6 V forward voltage at 7 A is too high for synchronous rectification efficiency; dedicated low-V_F Schottky or MOSFETs are required for that function.