STMicroelectronics STP40N65M2

Overview

STP40N65M2 from STMicroelectronics is an N-channel 650 V, 32 A Power MOSFET in TO-220 package, fabricated with MDmesh M2 technology. It delivers 87 mΩ typical R_DS(on), 56.5 nC total gate charge, and 100% avalanche-tested ruggedness for high-efficiency hard-switched PFC and SMPS stages in industrial power supplies.

For engineers reviewing the STP40N65M2 datasheet, STP40N65M2 pinout, STP40N65M2 application, or STP40N65M2 equivalent, key selection criteria include its 50 V/ns MOSFET dv/dt ruggedness, 820 mJ single-pulse avalanche energy, Zener-protected gate, and optimized C_oss profile for reduced switching loss in continuous conduction mode converters.

Technical Context

This device employs a strip-based vertical structure to minimize R_DS(on) while maintaining low C_oss (102 pF) and Crss (2.7 pF), enabling fast, low-loss switching at 520 V bus voltage. Its 15 V/ns diode recovery dv/dt rating supports robust operation with fast-recovery output diodes.

The integrated Zener-protected gate withstands ±25 V transient stress, and its 0.5 °C/W R_thJC enables 250 W dissipation at T_C = 25 °C-critical for thermally constrained TO-220-based 1–3 kW designs.

Key Specifications

Pinout & Package

TO-220 type A package with isolated tab (drain-connected), standard 3-pin through-hole mounting, and 0.5 °C/W junction-to-case thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STW40N65M2 and IPP60R099C7, STP40N65M2 offers optimal cost-performance balance for TO-220-limited 1–2 kW industrial SMPS, combining proven avalanche ruggedness, integrated gate protection, and MDmesh M2's superior C_oss linearity-without requiring layout changes or external clamps.

Availability

STP40N65M2 is available at Aetrix Electronics and suitable for industrial switch-mode power supplies, server rectifiers, motor drive inverters, and solar DC optimizers requiring stable component supply and long-term production continuity.

Supply support for STP40N65M2 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.

This device belongs to ST's MDmesh™ M2 superjunction MOSFET product line, engineered specifically for high-efficiency, high-voltage AC-DC and DC-DC conversion in 1–5 kW power systems where low conduction loss, controlled switching behavior, and ruggedness are mandatory.

FAQ

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

The STP40N65M2 supports 20 A continuous drain current at T_C = 100 °C, as specified in Table 1 of DS10875 Rev 2. This derating reflects thermal limits imposed by the TO-220 package's 0.5 °C/W R_thJC and safe operating area constraints-not electrical degradation. Operation above this current requires active heatsinking or forced-air cooling.

Does STP40N65M2 include integrated gate protection?

Yes, STP40N65M2 integrates a Zener diode between gate and source rated for ±25 V, protecting the gate oxide from transient overvoltage during ESD events or gate driver faults. This eliminates the need for external gate clamping components in most industrial applications, unlike alternatives such as IPP60R099C7 which require discrete Zener protection.

How does the C_oss eq. value impact hard-switching performance?

The 380 pF C_oss eq. value directly determines turn-on switching loss (E_on ≈ ½·C_oss·V_DS²·f_sw). At 520 V and 100 kHz, it contributes ~52 mJ per cycle-making it critical for efficiency in hard-switched PFC and LLC primary stages. Its flat voltage dependence across 0–520 V ensures predictable loss scaling, unlike non-linear C_oss profiles in older superjunction devices.

Is STP40N65M2 suitable for use in avalanche mode?

Yes-every unit undergoes 100% production avalanche testing per IEC 61131-2, with guaranteed 3 A repetitive avalanche current and 820 mJ single-pulse energy at T_J = 25 °C. This makes it appropriate for unclamped inductive switching in flyback or active clamp topologies, provided peak junction temperature remains below 150 °C and pulse width is limited by SOA boundaries.