Diodes Incorporated DMNH4005SCTQ

Overview

DMNH4005SCTQ from Diodes Incorporated is a 40V, 150A N-channel enhancement-mode MOSFET in TO220AB package, qualified to AEC-Q101 for automotive use. It delivers 3.4mΩ R_DS(ON) @ V_GS = 10V, supports +175°C operation, and features low input capacitance (2846pF) and robust avalanche energy rating (500mJ). It serves as a high-current power switch in motor control, DC-DC converters, and backlighting circuits.

For engineers reviewing the DMNH4005SCTQ datasheet, DMNH4005SCTQ pinout, DMNH4005SCTQ application, or DMNH4005SCTQ equivalent, key selection criteria include its AEC-Q101 qualification, 150A continuous drain current at T_C = +25°C, 0.9°C/W thermal resistance (Junction-to-Case), 48nC total gate charge at V_GS = 10V, and TO220AB mechanical compatibility with standard heatsink mounting.

Technical Context

This MOSFET employs planar silicon process technology optimized for low R_DS(ON) and fast switching in high-reliability automotive power stages. Its gate threshold voltage (1–3V) enables robust drive with standard 5V/10V logic-level controllers, while the integrated body diode supports synchronous rectification and freewheeling in buck and half-bridge topologies.

The device's SOA is characterized up to 1μs pulse width with R_DS(ON)-limited conduction, and its transient thermal impedance curve supports accurate junction temperature estimation under pulsed load conditions. Avalanche ruggedness (IAS = 30A, EAS = 500mJ) ensures survivability during inductive turn-off transients without external snubbers.

Key Specifications

Pinout & Package

Package: TO220AB - Molded plastic case with copper leadframe, matte tin-plated terminals, UL 94V-0 flammability rating, and 1.85g mass. Mounting tab is electrically connected to drain (D).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel power MOSFET applications.

Compared with STL220N4F7AG and IXTH150N04S2, DMNH4005SCTQ offers optimal balance of automotive qualification, low gate charge, and TO220AB mechanical compatibility-making it preferred for cost-sensitive, volume automotive power stages where PPAP and thermal performance are jointly critical.

Availability

DMNH4005SCTQ is available at Aetrix Electronics and suitable for motor control, DC-DC converters, and backlighting applications requiring stable component supply, long-term automotive-grade availability, and traceable sourcing.

Supply support for DMNH4005SCTQ 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power, signal integrity, and protection solutions for automotive, industrial, and consumer markets.

This device belongs to Diodes' AEC-Q101-qualified PowerMOS™ family, engineered specifically for demanding automotive power switching applications-including engine control, body electronics, and ADAS subsystems-where thermal resilience and long-term parametric stability are mandatory.

FAQ

Is DMNH4005SCTQ suitable for synchronous rectification in a 400kHz buck converter?

Yes. With 3.4mΩ R_DS(ON), 48nC Q_g, and 242pF Crss, DMNH4005SCTQ supports efficient synchronous rectification at 400kHz. Its low reverse recovery charge (Q_RR = 24nC) and fast t_RR = 29ns minimize body diode conduction loss during dead-time, provided gate drive rise/fall times are controlled to avoid shoot-through.

What is the maximum allowable case temperature for continuous 150A operation?

The 150A rating applies strictly at T_C = +25°C. At T_C = +100°C, the datasheet specifies I_D = 100A. Derating follows the SOA curve: for sustained 150A, case temperature must remain ≤+25°C with sufficient heatsinking (e.g., ≥0.1°C/W system thermal resistance) to maintain T_J ≤+175°C.

Does the TO220AB package require electrical isolation when mounted to a heatsink?

Yes. The metal tab is internally connected to the Drain terminal. If the heatsink is grounded or referenced to a different potential than the drain node, an electrically isolating pad (e.g., mica or polymer film) and shoulder washer must be used to prevent short circuits. Thermal interface material must retain dielectric strength ≥500V.

How does the gate threshold voltage shift across temperature, and what impact does it have on drive design?

V_GS(TH) decreases from ~2.5V at –55°C to ~1.3V at +175°C (Fig. 8). This requires gate drivers capable of delivering ≥4.5V minimum over temperature to ensure full enhancement. Logic-level drivers (e.g., 3.3V) may cause partial turn-on and excessive R_DS(ON) at high temperature; 10V drive is recommended for margin.