Vishay Siliconix SQW44N65EF-GE3

Overview

SQW44N65EF-GE3 from Vishay Siliconix is a 650 V, 47 A N-channel power MOSFET in TO-247AD package, featuring 0.063 Ω R_DS(on) at 10 V_GS, 177 nC total gate charge, fast body diode (t_rr = 190 ns), and AEC-Q101 qualification - designed for high-efficiency automotive DC/DC converters and onboard chargers.

For engineers reviewing the SQW44N65EF-GE3 datasheet, SQW44N65EF-GE3 pinout, SQW44N65EF-GE3 application, or SQW44N65EF-GE3 equivalent, key selection criteria include its 650 V blocking voltage, ultra-low Q_g/Q_rr ratio, 175 °C junction rating, and avalanche energy rating (E_AS = 596 mJ) for robust unclamped inductive switching.

Technical Context

This device implements Vishay's E Series fast-body-diode technology to reduce reverse recovery charge (Q_rr = 1.7 μC typ.) and peak reverse recovery current (I_RRM = 17 A), enabling lower switching losses in hard-switched topologies. Its low C_iss (5858 pF) and optimized Cr_ss/C_oss ratio support high dv/dt immunity (100 V/ns) and stable gate drive under high-frequency operation.

The MOSFET integrates an integral body diode with V_SD = 0.9 V at 22 A and T_J = 25 °C, rated for continuous source-drain current up to 47 A at T_C = 25 °C and pulsed current up to 146 A. Thermal resistance R_thJC is 0.3 °C/W, supporting high-power dissipation in compact heatsink designs.

Key Specifications

Pinout & Package

Package: TO-247AD - industry-standard 3-lead through-hole package with isolated drain tab, 20.8 mm × 15.5 mm footprint, and 0.3 °C/W junction-to-case thermal resistance. Mounting requires mechanical isolation and torque-controlled screw assembly (typ. 0.8 N·m).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STW48N65M5 and IXFH44N65X2, the SQW44N65EF-GE3 delivers the lowest combined Q_rr/t_rr among AEC-Q101-qualified 650 V MOSFETs, making it optimal for high-frequency, high-reliability automotive power conversion where diode recovery behavior directly impacts system efficiency and EMI.

Availability

SQW44N65EF-GE3 is available at Aetrix Electronics and suitable for automotive onboard chargers, DC/DC converters, and industrial motor drives requiring stable component supply across multi-year production cycles.

Supply support for SQW44N65EF-GE3 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

Vishay Siliconix is a global leader in discrete semiconductors, specializing in high-performance MOSFETs, diodes, and optoelectronics for automotive, industrial, and computing markets.

The SQW44N65EF-GE3 belongs to Vishay's E Series high-voltage power MOSFET family, engineered specifically for automotive-grade efficiency-critical applications such as traction inverters, OBCs, and DC/DC converters demanding fast body diodes and rugged avalanche capability.

FAQ

What is the maximum continuous drain current rating for SQW44N65EF-GE3 at 100 °C case temperature?

The SQW44N65EF-GE3 supports 34 A continuous drain current at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This rating reflects thermal derating from the 47 A value at T_C = 25 °C, based on a linear derating factor of 3.3 W/°C and R_thJC = 0.3 °C/W. Designers must ensure heatsink design maintains case temperature ≤100 °C under worst-case load and ambient conditions to sustain this current level reliably in the SQW44N65EF-GE3.

Is SQW44N65EF-GE3 suitable for use in a synchronous rectifier configuration?

No - the SQW44N65EF-GE3 is not recommended for synchronous rectification due to its non-optimized body diode characteristics for reverse conduction. While it features a fast body diode (t_rr = 190 ns), its V_SD = 0.9 V at 22 A and relatively high Q_rr make it less efficient than dedicated low-V_F Schottky or trench-SiC diodes in secondary-side rectification. The SQW44N65EF-GE3 is intended for primary-side switching in hard- or resonant-switched topologies where its avalanche rating and high-voltage capability are essential.

Does SQW44N65EF-GE3 require a negative gate turn-off voltage to ensure reliable switching?

No - the SQW44N65EF-GE3 operates reliably with 0 V to +10 V gate drive and does not require negative turn-off bias. Its gate threshold voltage (V_GS(th)) ranges from 2.0 V to 4.0 V, and gate leakage remains ≤±100 nA at ±20 V, ensuring noise immunity and stable off-state blocking. A gate drive circuit delivering +10 V for turn-on and 0 V for turn-off - with adequate current sourcing/sinking capability (>2 A peak) - fully satisfies the SQW44N65EF-GE3's switching requirements without negative voltage rails.

What is the avalanche energy rating of SQW44N65EF-GE3, and how is it tested?

The SQW44N65EF-GE3 has a single-pulse unclamped inductive switching (UIS) avalanche energy rating of 596 mJ, measured per JEDEC standard JESD24-11. Testing uses V_DD = 140 V, starting T_J = 25 °C, L = 28.2 mH, R_g = 25 Ω, and I_AS = 6.5 A. This rating confirms the device can safely absorb transient energy during overvoltage events without failure, eliminating the need for external clamping components in properly designed SQW44N65EF-GE3-based power stages.

How does the TO-247AD package of SQW44N65EF-GE3 differ from standard TO-247?

The TO-247AD package used by SQW44N65EF-GE3 features an isolated drain tab - unlike standard TO-247 - allowing direct mounting to a heatsink without electrical isolation hardware. Its dimensions (20.8 mm × 15.5 mm) and pin pitch match industry standards, but the "AD" suffix denotes enhanced creepage/clearance for high-voltage applications. This design reduces thermal resistance (R_thJC = 0.3 °C/W) and simplifies mechanical integration in SQW44N65EF-GE3-based automotive power modules where space and reliability are critical.