STMicroelectronics STB12NM50T4

Overview

STB12NM50T4 from STMicroelectronics is an N-channel 500 V, 350 mΩ (max), 12 A MDmesh™ Power MOSFET in D²PAK (TO-263) package, designed for high-voltage switching in offline SMPS, PFC stages, and industrial motor drives. It delivers low gate charge (28 nC), high dv/dt immunity (15 V/ns), and 100% avalanche-tested ruggedness.

For engineers reviewing the STB12NM50T4 datasheet, STB12NM50T4 pinout, STB12NM50T4 application, or STB12NM50T4 equivalent, key selection criteria include its 500 V breakdown voltage, 300 mΩ typical R_DS(on), 400 mJ single-pulse avalanche energy, and D²PAK thermal resistance of 2.78 °C/W - critical for high-reliability 200–500 W power conversion designs.

Technical Context

This device uses ST's MDmesh™ technology combining multi-drain process and PowerMESH™ horizontal layout to achieve ultra-low on-resistance while maintaining high voltage capability. Its 100% avalanche-tested rating ensures robustness under unclamped inductive switching stress.

The 20 ns turn-on delay, 10 ns rise time, and 20 pF Crss support fast, efficient hard-switching up to 100 kHz. The integrated source-drain diode features 12 A continuous current, 270 ns reverse recovery time at 25 °C, and 2.23 µC Q_rr, enabling quasi-resonant and ZVS-capable topologies.

Key Specifications

Pinout & Package

D²PAK (TO-263) package: surface-mount, isolated tab (drain-connected), 3-pin outline with 2.54 mm lead pitch; requires thermal pad soldering to PCB copper for optimal heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP12NM50 and STP12NM50FP, STB12NM50T4 provides superior thermal performance (2.78 °C/W), reinforced isolation (2.5 kV RMS), and surface-mount compatibility - making it the sole option for high-density, safety-critical, and thermally demanding 300+ W designs.

Availability

STB12NM50T4 is available at Aetrix Electronics and suitable for industrial SMPS, server power supplies, motor drive inverters, and EV charger auxiliary supplies requiring stable component supply and long-term lifecycle assurance.

Supply support for STB12NM50T4 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 automotive, industrial, and consumer markets.

STB12NM50T4 belongs to ST's MDmesh™ high-voltage Power MOSFET product line, engineered specifically for energy-efficient, high-reliability offline power conversion in 200–1000 W applications.

FAQ

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

The STB12NM50T4 supports 7.5 A continuous drain current at T_C = 100 °C, as specified in Table 1 of DS1944 Rev 13. This rating is limited by junction temperature (150 °C max) and thermal resistance (2.78 °C/W), not package current-carrying capacity. Derating curves confirm linear reduction from 12 A at 25 °C to 7.5 A at 100 °C.

Does the D²PAK package provide electrical isolation between leads and heatsink?

Yes - the STB12NM50T4 D²PAK package is rated for 2.5 kV RMS insulation withstand voltage from all three leads to external heatsink (per Table 1, V_ISO). This enables direct mounting to grounded metal chassis without insulating pads in Class II isolated systems, provided creepage and clearance meet IEC 62368-1 requirements.

Can STB12NM50T4 replace STP12NM50 in existing TO-220 layouts?

No - STB12NM50T4 uses D²PAK (TO-263) surface-mount packaging with different footprint, thermal pad layout, and pin assignment (G-D-S vs. G-D-S but tab-as-drain). Direct replacement requires PCB redesign, requalification of thermal performance, and verification of gate drive loop inductance. It is not a drop-in substitute.

What is the typical reverse recovery charge of the integrated body diode?

The typical reverse recovery charge (Q_rr) is 2.23 µC at T_J = 25 °C, ISD = 12 A, di/dt = 100 A/µs, and V_DD = 100 V (Table 6). At 150 °C, Q_rr increases to 3 µC. This value directly impacts switching losses in hard-commutated topologies and must be included in total gate driver loss calculations.