STMicroelectronics STF3N62K3

Overview

STF3N62K3 from STMicroelectronics is an N-channel 620 V, 2.5 Ω (max), 2.7 A MDmesh™ K3 Power MOSFET in TO-220FP package, designed for high-voltage switching in offline SMPS, PFC stages, and industrial AC-DC converters. It features Zener-protected gate, 100% avalanche tested operation, and extremely high dv/dt capability (9 V/ns) for robust hard-switching.

For engineers reviewing the STF3N62K3 datasheet, STF3N62K3 pinout, STF3N62K3 application, or STF3N62K3 equivalent, this device is selected for high-efficiency, high-reliability 600 V-class power conversion where low R_DS(on), fast switching, and integrated gate protection are critical design requirements.

Technical Context

This MOSFET employs ST's MDmesh™ K3 vertical superjunction architecture to achieve 2.2 Ω typ. R_DS(on) at 620 V rating, with optimized cell pitch and charge compensation for reduced output capacitance (C_oss = 55 pF) and reverse transfer capacitance (C_rss = 6 pF). Its built-in back-to-back gate-source Zener diodes provide ±30 V ESD protection without external clamping.

The device delivers 100 mJ single-pulse avalanche energy (E_AS) and supports unclamped inductive switching up to 2.7 A, with reverse recovery time (t_rr) of 190 ns at T_j = 25 °C and 255 ns at 150 °C - enabling stable operation in flyback and resonant topologies under thermal stress.

Key Specifications

Pinout & Package

TO-220FP package: insulated flange, 3-pin through-hole, 10.4 mm height, 16 mm lead length (L2), 3 mm mounting hole diameter. Flange electrically isolated from drain (D) terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP3N62K3, STF3N62K3 trades 3.75 °C/W higher junction-to-case thermal resistance for flange isolation and compact footprint; versus FQP3N62, it adds Zener protection and doubles E_AS, enabling safer operation in uncontrolled surge environments.

Availability

STF3N62K3 is available at Aetrix Electronics and suitable for offline AC-DC adapters, industrial SMPS, and LED driver designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STF3N62K3 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 automotive, industrial, and consumer markets.

This device belongs to the MDmesh™ K3 Power MOSFET product line, engineered specifically for high-efficiency, high-reliability 600 V-class switching in offline power conversion systems demanding low R_DS(on), fast dynamic response, and intrinsic ruggedness.

FAQ

What is the maximum gate-source voltage rating for STF3N62K3?

The absolute maximum V_GS is ±30 V, enforced by integrated back-to-back Zener diodes. This eliminates need for external gate clamps in most designs. Operation beyond ±30 V risks permanent gate oxide damage, even briefly - drive circuits must be designed to stay within this limit under all conditions including ringing and overshoot.

Can STF3N62K3 replace STD3N62K3 in a DPAK-based PCB layout?

No - STF3N62K3 uses TO-220FP package with different footprint, thermal pad configuration, and mounting holes. DPAK (STD3N62K3) has surface-mount leads and exposed drain tab; TO-220FP is through-hole with insulated flange. Mechanical redesign and thermal validation are required for substitution.

What is the significance of "100% avalanche tested" in the datasheet?

Every unit undergoes unclamped inductive switching test at I_AR = 2.7 A and V_DD = 50 V to verify E_AS ≥ 100 mJ. This ensures guaranteed single-pulse ruggedness in real-world overcurrent events like output short-circuit or transformer saturation, unlike statistical sampling used by many competitors.

How does the TO-220FP package affect thermal performance compared to standard TO-220?

TO-220FP has insulated flange and shorter leads, resulting in higher R_thj-case (6.25 °C/W vs. ~2.5 °C/W for TO-220). However, its flange isolation enables direct heatsink mounting without insulating washers, simplifying assembly and improving long-term thermal interface reliability in vibration-prone industrial environments.