STMicroelectronics STF15N95K5

Overview

STF15N95K5 from STMicroelectronics is a high-voltage N-channel Power MOSFET using MDmesh K5 technology, designed for primary-side switching in offline SMPS, PFC stages, and industrial HV DC-DC converters. It delivers 950 V V_(BR)DSS, 410 mΩ typ. R_DS(on) at V_GS = 10 V, 12 A I_D (T_C = 25 °C), and 30 nC total gate charge - enabling high-efficiency, compact flyback and resonant topologies up to 100 kHz.

For engineers reviewing the STF15N95K5 datasheet, STF15N95K5 pinout, STF15N95K5 application, or STF15N95K5 equivalent, key selection criteria include avalanche ruggedness (124 mJ E_AS), ultra-low FoM (R_DS(on) × Q_g = 12.3 Ω·nC), Zener-protected gate, and TO-220FP package thermal performance (R_thJC = 0.74 °C/W).

Technical Context

This device employs ST's proprietary vertical MDmesh K5 structure to minimize specific on-resistance and gate charge simultaneously. Its 950 V breakdown voltage supports universal AC input (85–265 VAC) with margin for transient overvoltage in telecom and industrial power supplies.

The integrated source-drain diode features 444 ns t_rr and 7 µC Q_rr at 25 °C, enabling hard-switched operation with controlled recovery; dv/dt ruggedness of 50 V/ns ensures robustness against parasitic turn-on in high-noise environments.

Key Specifications

Pinout & Package

STF15N95K5 is housed in a TO-220FP (Full-Pak) package with insulated tab, enabling direct mounting to a common heat sink without isolation hardware. The plastic body provides creepage/clearance compliance for Class II safety designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP15N95K5 and STW15N95K5, STF15N95K5 uniquely combines TO-220FP's insulated-tab safety, lowest package thermal resistance among TO-220 variants, and optimized gate charge for medium-power SMPS - making it the preferred choice for certified, space-constrained 300–500 W industrial supplies.

Availability

STF15N95K5 is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, telecom rectifier modules, and EV charging station auxiliary supplies requiring stable component supply and long-term lifecycle support.

Supply support for STF15N95K5 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.

STF15N95K5 belongs to the MDmesh K5 high-voltage Power MOSFET product line, engineered specifically for high-efficiency, high-density offline power conversion in industrial and telecom infrastructure.

FAQ

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

The STF15N95K5 supports 7.6 A continuous drain current at T_C = 100 °C, as specified in Table 1 of DS9942 Rev 3. This rating reflects thermal derating due to reduced channel mobility and increased R_DS(on) at elevated temperatures, and must be applied when heatsink temperature exceeds 75 °C in sealed enclosures.

Does STF15N95K5 require an external gate resistor for stability?

Yes - a 4.7 Ω gate resistor is used in the official switching time test circuit (Figure 18, DS9942), and ST recommends 4.7–10 Ω for hard-switched topologies to dampen ringing caused by L_GS/L_GD interaction. Lower values (<2.2 Ω) risk overshoot and oscillation due to the device's 6 Ω intrinsic gate resistance and 22 nC Q_gd.

Can STF15N95K5 replace STF15N65K3 in existing 650 V designs?

No - while both are MDmesh K-series TO-220FP MOSFETs, STF15N95K5 has higher V_(BR)DSS (950 V vs. 650 V) and higher R_DS(on) (500 mΩ vs. 350 mΩ), resulting in 43% higher conduction loss at same current. Its gate threshold (3–5 V) and Q_g (30 nC vs. 24 nC) also differ, requiring driver revalidation.

Is the TO-220FP package compliant with RoHS and REACH?

Yes - STF15N95K5 carries ECOPACK2 certification per ST's environmental compliance program, confirming lead-free terminations, halogen-free molding compound, and full REACH SVHC screening. The "FP" suffix denotes full-pak construction meeting IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) for unlimited floor life.