STMicroelectronics SCT040W65G3-4

Overview

SCT040W65G3-4 from STMicroelectronics is a silicon carbide (SiC) Power MOSFET rated for 650 V drain-source voltage, 45 mΩ typical R_DS(on) at V_GS = 18 V and T_J = 25 °C, and 30 A continuous drain current at T_C = 25 °C and 100 °C. It features a source-sensing pin for improved gate control accuracy and operates up to 200 °C junction temperature. It is used in high-efficiency, high-frequency DC-DC converters for renewable energy inverters.

For engineers reviewing the SCT040W65G3-4 datasheet, SCT040W65G3-4 pinout, SCT040W65G3-4 application, or SCT040W65G3-4 equivalent, key selection criteria include its 45 mΩ R_DS(on) at 18 V drive, 16 ns typical reverse recovery time, 37.5 nC total gate charge, 0.73 °C/W junction-to-case thermal resistance, and HiP247-4 package with dedicated driver source terminal.

Technical Context

This SiC MOSFET employs ST's third-generation trench-gate SiC technology, delivering stable R_DS(on) across -55 °C to 200 °C and low output capacitance (C_oss = 92 pF) for reduced switching losses. Its intrinsic body diode exhibits fast reverse recovery (t_rr = 16 ns) and low Q_rr (83 nC), enabling hard-switched and resonant topologies without external anti-parallel diodes.

The HiP247-4 package integrates a Kelvin source connection (pin 3) to eliminate source inductance impact on gate drive loop, ensuring precise threshold control and minimizing dynamic R_DS(on) overshoot during turn-on. Gate drive requires V_GS between –5 V and +18 V, with transient tolerance up to –11 V/+25 V for robust noise immunity.

Key Specifications

Pinout & Package

The SCT040W65G3-4 is housed in the HiP247-4 surface-mount compatible through-hole package, featuring isolated tab (drain), Kelvin source sensing, and optimized thermal path via copper leadframe and exposed metal base.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SiC MOSFET applications.

Compared with C3M0045065K and IXFH40N65X2, the SCT040W65G3-4 delivers superior thermal robustness (200 °C T_J vs. 175 °C), lower gate charge (37.5 nC vs. 42 nC), and integrated Kelvin source-making it optimal for high-power density, high-reliability renewable and server power designs.

Availability

SCT040W65G3-4 is available at Aetrix Electronics and suitable for photovoltaic string inverters, onboard EV chargers, and industrial UPS systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SCT040W65G3-4 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.

This device belongs to ST's STPOWER SiC portfolio, engineered specifically for high-efficiency, high-frequency power conversion in renewable energy, EV infrastructure, and datacenter power supplies.

FAQ

What gate drive voltage is recommended for optimal R_DS(on) and reliability?

ST specifies V_GS = 18 V for minimum R_DS(on) (45 mΩ) and recommends operating within –5 V to +18 V. A gate drive of –5 V/+15 V is preferred for robust noise immunity and reduced Miller-induced false turn-on, especially in high-di/dt applications like totem-pole PFC.

Does the HiP247-4 package require special PCB layout considerations?

Yes. The Kelvin source (pin 3) must be routed with minimal loop area and separate from the power source (pin 2) trace. Drain tab (pin 1) requires ≥20 mm² copper pour with multiple thermal vias to inner ground planes. Gate (pin 4) routing must avoid parallel runs near power traces to suppress coupling.

Can SCT040W65G3-4 replace silicon MOSFETs in existing 650 V designs without circuit changes?

No. While voltage/current ratings align, SiC's faster switching demands revised gate drive strength (≥2 A peak), optimized snubbers, tighter layout control, and adjusted dead-time settings. Also, its lower gate threshold (1.8–4.2 V) requires verification of controller compatibility and noise margins.

Is the intrinsic body diode suitable for continuous reverse conduction in synchronous rectification?

Yes. The device supports 30 A continuous reverse current (ISD) at T_C = 25 °C and 100 °C, with V_SD = 2.8 V at 20 A and low Q_rr (83 nC). This enables reliable synchronous rectification in DC-DC converters without external diodes, provided thermal design accommodates forward conduction losses.