STMicroelectronics STP12N50M2

Overview

STP12N50M2 from STMicroelectronics is an N-channel 500 V, 325 mΩ (typ), 10 A Power MOSFET in TO-220 package, fabricated using MDmesh M2 strip layout and optimized vertical structure. It delivers low gate charge (15 nC), excellent Coss profile (33 pF typ), and 100% avalanche tested ruggedness for high-efficiency offline SMPS and PFC stages.

For engineers reviewing the STP12N50M2 datasheet, STP12N50M2 pinout, STP12N50M2 application, or STP12N50M2 equivalent, key selection criteria include RDS(on) stability over temperature, dv/dt ruggedness (50 V/ns), Zener-protected gate, and unclamped inductive switching capability up to 204 mJ.

Technical Context

This device employs ST's MDmesh M2 technology to achieve a balance of low conduction loss and fast switching. Its optimized output capacitance (Coss = 33 pF typ, Coss_eq = 125 pF) enables reduced switching loss in hard-switched converters, while the 15 nC total gate charge supports high-frequency operation with moderate drive strength.

The MOSFET integrates a Zener-protected gate and features robust avalanche performance (IAR = 3.5 A, EAS = 204 mJ), enabling reliable operation in inductive load switching and transient overload conditions without external clamping. Its 1.47 °C/W junction-to-case thermal resistance supports direct heatsink mounting in power supplies up to 150 W.

Key Specifications

Pinout & Package

STP12N50M2 is housed in a standard TO-220 type A package with isolated tab (drain-connected). The case is electrically connected to the drain terminal and must be insulated from heatsink unless drain is at ground potential.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IPP65R041CFD7 and STW20N65M5, STP12N50M2 offers optimal trade-off of 500 V rating, 380 mΩ on-resistance, and 15 nC gate charge for cost-sensitive, medium-power SMPS where avalanche robustness and compact TO-220 footprint are critical.

Availability

STP12N50M2 is available at Aetrix Electronics and suitable for server PSUs, industrial AC-DC adapters, and PFC boost converters requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for STP12N50M2 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

STP12N50M2 belongs to the MDmesh M2 high-voltage power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline power conversion in telecom, server, and industrial power supplies.

FAQ

Is STP12N50M2 suitable for use in a 230 VAC input PFC boost stage?

Yes. With a 500 V V_DS rating and 100% avalanche testing (E_AS = 204 mJ), STP12N50M2 safely handles the 385 VDC rectified peak plus 10–15% margin for line surges and ringing in universal-input PFC circuits. Its 325 mΩ typical R_DS(on) ensures low conduction loss at 10 A RMS.

Does the TO-220 package require electrical isolation from the heatsink?

Yes. Pin 2 (the metal tab) is internally connected to the drain terminal. If the drain is not at chassis or system ground potential-as in high-side or floating configurations-the tab must be electrically insulated from the heatsink using a mica or polymer insulator and thermal compound to prevent short circuits.

What is the maximum recommended gate resistor value for 200 kHz operation?

For 200 kHz switching with 15 nC Q_g, a gate resistor of 10–22 Ω is recommended when driven by a 1–2 A peak gate driver. This balances switching speed (t_f ≈ 35 ns) against EMI and shoot-through risk. Lower values increase dV/dt stress; higher values raise switching losses beyond 0.5 W at full load.

Can STP12N50M2 replace STP12NK50Z in an existing design?

Yes, with validation. STP12N50M2 offers lower R_DS(on) (325 mΩ vs. 450 mΩ), lower Q_g (15 nC vs. 27 nC), and improved C_oss profile vs. STP12NK50Z. Gate threshold (2–4 V) and pinout are identical, but layout review is required to confirm thermal margin due to higher power density.