STMicroelectronics STF5N105K5

Overview

STF5N105K5 from STMicroelectronics is a 1050 V, 3 A N-channel MDmesh K5 Power MOSFET in TO-220FP package, featuring 2.9 Ω typical R_DS(on), 12.5 nC total gate charge, and 100% avalanche-tested ruggedness. It delivers ultra-low FoM for high-voltage flyback, PFC, and industrial SMPS where efficiency, dv/dt immunity, and reliability under repetitive stress are critical.

For engineers reviewing the STF5N105K5 datasheet, STF5N105K5 pinout, STF5N105K5 application, or STF5N105K5 equivalent, key selection criteria include its 50 V/ns MOSFET dv/dt ruggedness, 85 mJ single-pulse avalanche energy, Zener-protected gate, and insulation withstand voltage of 2.5 kV RMS - all validated per DS10484 Rev 6.

Technical Context

This device implements ST's MDmesh K5 vertical superjunction architecture to minimize conduction and switching losses simultaneously. Its 210 pF input capacitance (C_iss) and 0.5 pF reverse transfer capacitance (C_rss) enable fast, low-noise switching at high bus voltages up to 840 V.

The integrated source-drain diode supports synchronous rectification and inductive load handling, with 400 ns reverse recovery time (T_rr) at 25 °C and 560 ns at 150 °C, while maintaining 1.5 V forward voltage at 3 A - critical for snubberless designs in high-frequency converters.

Key Specifications

Pinout & Package

TO-220FP (Type B) package: insulated plastic case with integral heatsink tab; footprint compatible with standard TO-220 mounting but electrically isolated leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STW5N105K5 and IXTH5N105, the STF5N105K5 uniquely combines reinforced insulation, on-chip Zener gate protection, and TO-220FP form factor - making it optimal for space-constrained, safety-certified, and cost-sensitive industrial power supplies where board-level isolation and component count reduction are priorities.

Availability

STF5N105K5 is available at Aetrix Electronics and suitable for industrial flyback converters, active PFC pre-regulators, and capacitor discharge units requiring stable component supply across long-lifecycle production programs.

Supply support for STF5N105K5 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, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

The MDmesh K5 Power MOSFET product line targets high-efficiency, high-reliability switched-mode power conversion - specifically engineered for 600–1200 V applications where low FoM, avalanche robustness, and system-level safety compliance are non-negotiable.

FAQ

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

The STF5N105K5 supports 2 A continuous drain current at T_C = 100 °C, as specified in Table 1 of DS10484 Rev 6. This derating reflects thermal limits of the TO-220FP package with R_thJC = 5 °C/W and maximum junction temperature of 150 °C - ensuring safe operation in enclosed industrial enclosures without forced airflow.

Does this MOSFET include an integrated body diode, and what are its key parameters?

Yes, STF5N105K5 integrates a source-drain diode rated for 3 A continuous and 12 A pulsed current. At 3 A, forward voltage is ≤1.5 V (typical), with reverse recovery time of 400 ns at 25 °C and 560 ns at 150 °C. Reverse recovery charge is 2.3 µC at 25 °C and 3.1 µC at 150 °C - values confirmed in Table 7 of DS10484 Rev 6.

Can STF5N105K5 be used in hard-switched resonant topologies like LLC?

No - STF5N105K5 is optimized for hard-switched flyback, boost, and forward converters, not zero-voltage switching (ZVS) resonant topologies. Its 0.5 pF C_rss and 210 pF C_iss support fast switching, but the body diode's 400–560 ns t_rr and lack of soft-recovery characteristics make it unsuitable for high-frequency LLC where diode reverse recovery causes excessive loss and EMI.

Is the TO-220FP package lead-free and RoHS-compliant?

Yes, STF5N105K5 is manufactured in ECOPACK2-compliant TO-220FP packaging, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. The "ECOPACK" marking on the device and documentation confirms compliance, and lead-free soldering profiles are validated per JEDEC J-STD-020.