STMicroelectronics STD4NK60ZT4

Overview

STD4NK60ZT4 from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET in DPAK (TO-252) package, rated for 600 V drain-source voltage, 2 Ω max R_DS(on), and 4 A continuous drain current at T_C = 25 °C. It delivers high dv/dt capability (4.5 V/ns), 100% avalanche tested operation (E_AS = 120 mJ), and minimized gate charge (Q_g = 18.8–26 nC), enabling robust switching in offline SMPS and AC-DC adapters.

For engineers reviewing the STD4NK60ZT4 datasheet, STD4NK60ZT4 pinout, STD4NK60ZT4 application, or STD4NK60ZT4 equivalent, key selection criteria include its 600 V rating, Zener-protected gate, low C_iss (510 pF), 1.79 °C/W junction-to-case thermal resistance, and DPAK footprint compatibility with high-power density board layouts.

Technical Context

This device implements ST's SuperMESH technology-an optimized evolution of PowerMESH-delivering reduced on-resistance while maintaining high ruggedness. Its Zener-protected gate structure ensures ±30 V V_GS tolerance and 3 kV HBM ESD immunity, eliminating need for external gate protection in cost-sensitive designs.

The MOSFET supports unclamped inductive switching with 4 A repetitive avalanche current and exhibits fast diode recovery (t_rr = 400 ns, Q_rr = 1.7 µC) under 150 °C junction conditions, making it suitable for hard-switched flyback and resonant converters where body diode performance impacts efficiency.

Key Specifications

Pinout & Package

DPAK (TO-252) package with exposed drain tab for thermal and electrical connection; surface-mount, single-row 3-pin outline (Type C3 per DS2818 Rev 10). Tab is electrically connected to drain (D), enabling low-inductance high-current paths and efficient heat transfer to PCB copper.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage N-channel MOSFET applications.

Compared with STP4NK60Z and IPP60R099C6, STD4NK60ZT4 uniquely combines Zener gate protection, DPAK SMT compatibility, and 1.79 °C/W thermal resistance-making it optimal for cost-sensitive, space-constrained offline adapters where gate robustness and thermal performance are jointly prioritized.

Availability

STD4NK60ZT4 is available at Aetrix Electronics and suitable for offline AC-DC adapters, flyback SMPS primary switches, and industrial LED driver power stages requiring stable component supply, long-term lifecycle support, and RoHS-compliant DPAK packaging.

Supply support for STD4NK60ZT4 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 analog, digital, and mixed-signal ICs, discrete devices, and MEMS sensors for automotive, industrial, and consumer markets.

STD4NK60ZT4 belongs to ST's SuperMESH Power MOSFET product line-engineered specifically for high-efficiency, high-reliability switching in 600 V offline power conversion systems where ruggedness, thermal performance, and gate protection are critical.

FAQ

What is the maximum continuous drain current at 100 °C case temperature?

The STD4NK60ZT4 supports 2.5 A continuous drain current at T_C = 100 °C, as specified in Table 1 of DS2818 Rev 10. This derating reflects thermal limitations of the DPAK package and must be applied in thermal design calculations when ambient temperature exceeds 50 °C or airflow is restricted.

Does this MOSFET require an external gate resistor for stability?

A gate resistor (typically 4.7 Ω) is recommended to dampen ringing and control switching speed, as confirmed by test circuits in Figures 13 and 15 of DS2818. The device's low Q_g and C_iss make it sensitive to parasitic inductance; omitting the resistor may cause overshoot or shoot-through in half-bridge configurations.

Is the source-drain diode suitable for freewheeling in synchronous rectification?

No-the intrinsic body diode has t_rr = 400 ns and Q_rr = 1.7 µC, which generates significant switching loss and EMI in synchronous rectifier positions. It is intended for clamping or emergency conduction only; external Schottky or MOSFET synchronous rectifiers are required for high-efficiency designs.

Can STD4NK60ZT4 replace STB4NK60ZT4 in existing designs?

No-STB4NK60ZT4 is a different part with distinct marking, packaging (tape-and-reel vs. tube), and minor parameter variations (e.g., slightly higher R_DS(on) typ.). Cross-replacement requires validation of gate drive timing, thermal margin, and avalanche performance per application conditions; ST explicitly separated their datasheets in Rev 10.