STMicroelectronics STF14N80K5

Overview

STF14N80K5 from STMicroelectronics is a high-voltage N-channel Power MOSFET using MDmesh K5 vertical structure technology, rated for 800 V V_DS, 445 mΩ R_DS(on) max at 10 V V_GS, and 12 A continuous drain current at T_C = 25 °C. It features ultra-low gate charge (22 nC), Zener-protected gate, and 100% avalanche tested performance - deployed in high-efficiency AC-DC adapters and industrial SMPS.

For engineers reviewing the STF14N80K5 datasheet, STF14N80K5 pinout, STF14N80K5 application, or STF14N80K5 equivalent, key selection criteria include its 4.2 °C/W junction-to-case thermal resistance, 270 mJ single-pulse avalanche energy, 4.5 V/ns diode recovery dv/dt rating, and TO-220FP package with insulated leads rated to 2.5 kV RMS.

Technical Context

This MOSFET implements ST's MDmesh K5 process to achieve low R_DS(on) × Q_g figure of merit (FoM), enabling high power density in hard-switched topologies. Its Zener-protected gate withstands ±30 V V_GS, and the integrated body diode supports 12 A continuous source-drain current with 1.5 V forward voltage at 12 A.

The device is characterized for rugged unclamped inductive switching up to 4 A repetitive avalanche current and 270 mJ E_AS at T_J = 25 °C. Its 620 pF C_iss, 60 pF C_oss, and 0.8 pF Crss support fast, low-loss switching in 400–640 V bus applications.

Key Specifications

Pinout & Package

TO-220FP (Type B) package with insulated plastic case and three leads: Drain (pin 2), Gate (pin 1), Source (pin 3). The molded body provides creepage/clearance compliance and eliminates need for insulating washers when mounted to metal heatsinks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STF12N80K5, the STF14N80K5 delivers +9% current headroom and tighter R_DS(on) tolerance; versus IPP60R099C7, it trades 150 V voltage rating for guaranteed avalanche ruggedness and integrated gate protection in safety-critical 800 V applications.

Availability

STF14N80K5 is available at Aetrix Electronics and suitable for industrial SMPS, server power supplies, and AC-DC adapters requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STF14N80K5 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The STF14N80K5 belongs to ST's MDmesh K5 high-voltage Power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline power conversion in space- and thermally-constrained applications.

FAQ

What is the maximum recommended gate drive voltage for STF14N80K5?

The absolute maximum gate-source voltage is ±30 V, but the device is specified for reliable operation at V_GS = 10 V for full R_DS(on) enhancement. Driving above 12 V yields diminishing R_DS(on) improvement while increasing gate oxide stress and ESD vulnerability. ST recommends 10 V ±0.5 V for optimal balance of on-resistance, switching speed, and long-term reliability.

Can STF14N80K5 be used in parallel configurations?

Yes, but with strict layout and gate drive matching. The device exhibits positive temperature coefficient for R_DS(on) above 25 °C (confirmed in Figure 9), supporting current sharing. However, parallel operation requires matched gate resistors, symmetrical PCB traces, and individual gate drive paths to avoid oscillation or uneven current distribution due to parasitic inductance differences.

Does STF14N80K5 require a gate resistor, and what value is recommended?

A gate resistor is mandatory to control dV/dt and suppress ringing. For typical 250 kHz SMPS operation with 10 V drive, ST recommends R_G = 4.7 Ω (per datasheet switching time test conditions). Lower values increase switching speed but risk overshoot and EMI; higher values reduce EMI but raise switching losses. Layout-dependent parasitics may require empirical tuning between 3.3 Ω and 10 Ω.

Is the body diode suitable for continuous freewheeling in synchronous rectification?

No - the body diode is optimized for clamping and recovery, not sustained conduction. Its 1.5 V forward voltage at 12 A results in excessive power dissipation during continuous freewheeling. For synchronous rectification, external Schottky or MOSFET-based synchronous rectifiers must be used; the STF14N80K5 body diode should only handle brief dead-time conduction or fault clamping.