STMicroelectronics STD5NK60ZT4

Overview

STD5NK60ZT4 from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET rated for 600 V drain-source voltage, 1.6 Ω max R_DS(on) at V_GS = 10 V and 2.5 A, and 5 A continuous drain current at T_C = 25 °C. It delivers high dv/dt capability (4.5 V/ns), 100% avalanche tested ruggedness (E_AS = 220 mJ), and low gate charge (Q_g = 26–34 nC), enabling reliable high-voltage switching in offline SMPS and AC-DC adapters.

For engineers reviewing the STD5NK60ZT4 datasheet, STD5NK60ZT4 pinout, STD5NK60ZT4 application, or STD5NK60ZT4 equivalent, key selection criteria include its DPAK package thermal resistance (R_thJC = 1.39 °C/W), Zener-protected gate (±30 V V_GS rating), and verified unclamped inductive switching performance under 5 A repetitive avalanche conditions.

Technical Context

This device implements ST's SuperMESH process - an evolution of PowerMESH - to simultaneously reduce R_DS(on) and intrinsic capacitance (C_iss = 690 pF typ., C_oss = 90 pF typ.) while maintaining robust 600 V breakdown (V_(BR)DSS ≥ 600 V). Its Zener-protected gate structure enables direct drive without external clamping across ±30 V V_GS limits.

The MOSFET supports fast switching with low Q_gd/Q_gs ratio (14 nC / 6 nC), contributing to stable turn-off behavior under high di/dt (200 A/μs) and high dv/dt stress. Its source-drain diode exhibits t_rr = 485 ns and Q_rr = 2.7 μC, suitable for hard-switched flyback and resonant topologies where body diode recovery impacts EMI and losses.

Key Specifications

Pinout & Package

STD5NK60ZT4 is housed in a DPAK (TO-252) type C3 surface-mount package with exposed drain tab for thermal and electrical connection. The package features 3 terminals: Gate (G), Drain (D), Source (S), with Drain connected to the large metal tab for low-inductance, high-current return path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP5NK60Z, STD5NK60ZT4 trades 0.39 °C/W higher junction-to-case thermal resistance for surface-mount compatibility and reduced assembly cost; versus FQP5N60, it adds guaranteed Zener protection and 220 mJ avalanche energy - critical for unattended industrial equipment.

Availability

STD5NK60ZT4 is available at Aetrix Electronics and suitable for AC-DC adapters, industrial SMPS, and LED drivers requiring stable component supply, long-term lifecycle support, and RoHS-compliant DPAK packaging.

Supply support for STD5NK60ZT4 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, specializing in power management, microcontrollers, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.

STD5NK60ZT4 belongs to ST's SuperMESH Power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline switching power supplies where avalanche ruggedness, low gate charge, and Zener gate protection are mandatory.

FAQ

Is STD5NK60ZT4 suitable for 230 V AC input rectified to ~325 V DC bus?

Yes. With a 600 V V_DS rating and 4.5 V/ns dv/dt immunity, STD5NK60ZT4 supports 230 V AC inputs (325 V DC bus) with ample margin for line surges, transformer leakage spikes, and ringing. Its 220 mJ E_AS rating ensures survival during transient overloads typical in universal-input SMPS.

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

The datasheet specifies I_D = 3.16 A at T_C = 100 °C. This derating reflects thermal limitations of the DPAK package (R_thJC = 1.39 °C/W); sustained operation above this current requires forced air cooling or enhanced copper pour to maintain T_J ≤ 150 °C.

Does the Zener protection cover both positive and negative gate transients?

Yes. The integrated bidirectional Zener clamps gate-to-source voltage to ±30 V, protecting against both positive overvoltage (e.g., Miller spike) and negative transients (e.g., shoot-through induced reverse bias), eliminating need for external TVS diodes in most adapter designs.

Can STD5NK60ZT4 replace STP5NK60Z in existing TO-220 layouts?

No - STD5NK60ZT4 uses DPAK (TO-252) packaging while STP5NK60Z uses TO-220. Footprint, thermal pad layout, and mounting method differ significantly. A PCB redesign is required; however, electrical characteristics including R_DS(on), Q_g, and avalanche rating are identical between the two variants.