STMicroelectronics STF20NM65N

Overview

STF20NM65N from STMicroelectronics is an N-channel 650 V, 0.250 Ω, 15 A Power MOSFET in TO-220FP package, realized with second-generation MDmesh™ vertical structure and strip layout. It delivers ultra-low R_DS(on) and gate charge for high-efficiency hard-switching SMPS in industrial power supplies and PFC stages.

For engineers reviewing the STF20NM65N datasheet, STF20NM65N pinout, STF20NM65N application, or STF20NM65N equivalent, key selection criteria include avalanche ruggedness (4 A I_AS, 115 mJ E_AS), low C_iss (1280 pF) and C_oss (110 pF), fast switching (t_d(on) = 15 ns, t_f = 21 ns), and 100% avalanche-tested reliability.

Technical Context

This MOSFET employs ST's second-generation MDmesh™ technology, combining a novel vertical drift region with optimized strip-cell layout to minimize conduction and switching losses simultaneously. Its 650 V V_DSS rating and 150 °C T_J(max) support operation in high-voltage offline converters up to 400 V DC bus.

The device features low intrinsic gate resistance (4.8 Ω), tightly controlled V_GS(th) (2–4 V), and robust body diode with 455 ns t_rr at 25 °C and 710 ns at 150 °C - enabling reliable operation in continuous conduction mode (CCM) PFC and resonant topologies.

Key Specifications

Pinout & Package

STF20NM65N uses the TO-220FP (Full-Pak) package: insulated plastic case with integral heatsink tab, 3-pin single-ended configuration, and creepage/clearance optimized for high-voltage isolation. Mounting requires no insulating washer due to 2500 V_RMS insulation withstand voltage between leads and heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP20NM65N, STF20NM65N trades 3.17 °C/W higher junction-to-case thermal resistance for integrated isolation and simplified mounting; versus IPP65R280C7, it offers superior avalanche immunity and body diode softness at the cost of slightly higher conduction loss and gate drive energy.

Availability

STF20NM65N is available at Aetrix Electronics and suitable for industrial switch-mode power supplies, active PFC boost converters, UPS inverter stages, and isolated DC-DC converters requiring stable component supply across multi-year production cycles.

Supply support for STF20NM65N 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

STF20NM65N belongs to the MDmesh™ high-voltage Power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline power conversion in industrial and telecom infrastructure equipment.

FAQ

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

The STF20NM65N supports 9.45 A continuous drain current at T_C = 100 °C, as specified in Table 2 of the datasheet. This derating reflects thermal limits of the TO-220FP package (R_thJC = 4.17 °C/W) and ensures safe operation within the 150 °C maximum junction temperature limit under sustained load conditions.

Does STF20NM65N require a gate resistor, and what value is recommended?

Yes - a gate resistor is mandatory to control dV/dt and suppress oscillation. ST recommends 4.7 Ω (as used in Figure 15 test circuit) for standard 10 V gate drive with 15 A load. Lower values (2.2–3.3 Ω) may be used for faster turn-on in low-noise environments; higher values (10–22 Ω) improve EMI but increase switching loss.

Can STF20NM65N replace STP20NM65N directly on a PCB?

No - STF20NM65N (TO-220FP) and STP20NM65N (TO-220) have different footprints and thermal pad configurations. The TO-220FP has a smaller outline, recessed leads, and integrated isolation; mechanical redesign and re-layout are required for substitution. Electrical characteristics are identical, but thermal mounting differs fundamentally.

What is the reverse recovery charge (Q_rr) of the internal body diode at 150 °C?

At T_J = 150 °C, the body diode exhibits Q_rr = 8 nC under test conditions of I_SD = 15 A, di/dt = 100 A/μs, and V_DD = 60 V (Table 8). This elevated Q_rr versus 5.5 nC at 25 °C reflects increased minority carrier lifetime and must be accounted for in PFC efficiency modeling at full-load/high-temperature operation.