STMicroelectronics STE70NM50

Overview

STE70NM50 from STMicroelectronics is an N-channel 500 V, 70 A, 0.045 Ω R_DS(on) MDmesh™ power MOSFET in ISOTOP package, featuring integrated gate-source Zener protection, 15 V/ns dv/dt capability, and 1.4 J single-pulse avalanche energy. It serves as a high-efficiency primary-side switch in industrial AC-DC converters and resonant SMPS.

For engineers reviewing the STE70NM50 datasheet, STE70NM50 pinout, STE70NM50 application, or STE70NM50 equivalent, key selection criteria include its 500 V V_DSS, 0.045 Ω R_DS(on) at V_GS = 10 V, 190–266 nC total gate charge, 7500 pF C_iss, and ISOTOP thermal resistance of 0.2 °C/W - all critical for high-voltage, high-current hard-switching and ZVS designs.

Technical Context

This MOSFET employs ST's MDmesh™ technology-combining Multiple Drain process with PowerMESH™ horizontal layout-to achieve ultra-low on-resistance while maintaining robust avalanche ruggedness (30 A repetitive I_AR, 1.4 J E_AS) and high dv/dt immunity (15 V/ns). Its integrated back-to-back 25 V gate-source Zener diodes eliminate need for external clamping.

The device delivers low dynamic losses via 53 nC Q_gs and 97 nC Q_gd, enabling fast switching (t_d(on) = 51 ns, t_f = 46 ns) under 400 V/60 A conditions. Its 1.5 Ω gate input resistance and tight V_GS(th) distribution (3–5 V) support stable gate drive design across temperature.

Key Specifications

Pinout & Package

STE70NM50 uses the ISOTOP package: a 4-terminal, through-hole, isolated tab package with 12.2 mm × 9.1 mm footprint, 31.7 mm length, and 0.2 °C/W thermal resistance. The metal tab is electrically connected to the drain.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IPP60R045CP and STW70NM60, STE70NM50 uniquely combines 500 V rating, 0.045 Ω R_DS(on), ISOTOP's 0.2 °C/W thermal resistance, and integrated Zener protection - making it optimal for thermally constrained, high-reliability 400 VAC-input industrial SMPS.

Availability

STE70NM50 is available at Aetrix Electronics and suitable for industrial AC-DC converters, resonant LLC power supplies, motor drive inverters, and induction heating systems requiring stable component supply and long-term manufacturing continuity.

Supply support for STE70NM50 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, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The MDmesh™ MOSFET product line targets high-efficiency, high-power-density switch-mode power conversion - specifically engineered to replace IGBTs and older planar MOSFETs in 380–800 V DC bus applications.

FAQ

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

The STE70NM50 supports 44 A continuous drain current at T_C = 100 °C, derated linearly from 70 A at 25 °C using the specified 5 W/°C derating factor. This reflects real thermal limits under heatsink-constrained conditions, not ambient-rated performance.

Does the built-in Zener protection cover both positive and negative gate transients?

Yes - the device integrates back-to-back Zener diodes between gate and source, providing symmetrical ±25 V clamping. This protects against both positive overvoltage (e.g., gate driver overshoot) and negative transients (e.g., Miller-induced undershoot), eliminating need for external bipolar TVS.

Can STE70NM50 be used in avalanche mode for energy clamping?

Yes - it is rated for 30 A repetitive avalanche current and 1.4 J single-pulse avalanche energy at T_j = 25 °C. Operation in unclamped inductive switching requires strict adherence to SOA limits and thermal management; pulse width must remain within safe operating area boundaries.

What is the recommended gate resistor value for 100 kHz hard-switching operation?

A 4.7 Ω gate resistor is validated in the datasheet for 100 kHz switching (t_d(on) = 51 ns, t_f = 46 ns). For faster edges or reduced EMI, values between 2.2 Ω and 6.8 Ω may be used - but must be verified with actual gate driver output impedance and PCB layout parasitics.