Diodes Incorporated DMG9N65CT

Overview

DMG9N65CT from Diodes Incorporated is a 650V, 9.0A N-channel enhancement-mode MOSFET in TO220AB package, featuring 1.3Ω R_DS(ON) @ V_GS = 10V, 39nC total gate charge, and AEC-Q101 qualification. It serves as a high-voltage switching element in offline power stages of motor control and DC-DC converters.

For engineers reviewing the DMG9N65CT datasheet, DMG9N65CT pinout, DMG9N65CT application, or DMG9N65CT equivalent, key selection criteria include its 650V BVDSS rating, thermal resistance of 0.7°C/W (junction-to-case), body diode reverse recovery time of 570ns, and suitability for high-reliability industrial power management where RoHS-compliant, halogen-free construction is required.

Technical Context

This MOSFET employs planar silicon technology optimized for high-voltage hard-switching operation. Its 650V breakdown voltage supports universal-input AC-DC front-end designs, while low input capacitance (2310pF C_iss) and fast turn-off delay (122ns) enable efficient operation at 50–100kHz switching frequencies.

The device integrates a robust intrinsic body diode with 4.17µC Q_RR and 570ns t_RR, supporting discontinuous conduction mode (DCM) flyback and active clamp forward topologies. Thermal design is enabled by direct-mount capability on infinite heatsinks and a junction temperature range of –55°C to +150°C.

Key Specifications

Pinout & Package

TO220AB package: three-terminal through-hole outline with isolated tab (drain-connected), matte tin-plated copper leadframe, UL 94V-0 molded plastic body, 1.85g mass. Mounting requires mechanical isolation unless drain is referenced to chassis ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DMG9N65CT, DMG7N65SCT offers superior conduction performance and enhanced thermal isolation, while STP9NK65ZFP provides equivalent electrical specs at lower cost but without automotive reliability validation - making DMG9N65CT optimal for AEC-Q101–required industrial motor drives where proven field reliability is prioritized over marginal efficiency gains.

Availability

DMG9N65CT is available at Aetrix Electronics and suitable for motor control, backlighting, and DC-DC converter designs requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.

Supply support for DMG9N65CT 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The DMG9N65CT belongs to Diodes' high-voltage power MOSFET product line, engineered for ruggedness and reliability in industrial power conversion, motor drives, and lighting systems operating at 600V+ bus voltages.

FAQ

Is DMG9N65CT suitable for use in automotive applications?

Yes - DMG9N65CT is qualified to AEC-Q101 standards, including temperature cycling, high-temperature reverse bias (HTRB), and unbiased highly accelerated stress test (UHAST). It is approved for under-hood and cabin applications such as HVAC motor control and body electronics, provided layout adheres to creepage/clearance requirements per ISO 26262 functional safety guidelines.

What is the recommended gate resistor value for DMG9N65CT in a 65kHz flyback converter?

A 10Ω gate resistor is recommended for 65kHz operation to balance switching speed and EMI. This value yields ~25ns rise time with typical 1.5A gate driver capability and suppresses parasitic oscillation caused by 2.2Ω gate resistance and PCB inductance. For lower EMI, increase to 15–22Ω; for faster switching, reduce only if driver can source ≥2A peak current.

Does the TO220AB package require thermal compound when mounted to a heatsink?

Yes - thermal interface material (TIM) is mandatory between the TO220AB metal tab and heatsink. The device's R_θJC = 0.7°C/W assumes ideal metal-to-metal contact; actual thermal resistance increases by 0.5–1.5°C/W without TIM. Use silicone-based or phase-change pads rated for >150°C continuous operation to maintain junction temperature below 150°C under 9A load.

Why is DMG9N65CT marked "NOT RECOMMENDED FOR NEW DESIGN"?

Diodes Incorporated recommends DMG7N65SCT for new designs due to its lower 0.75Ω R_DS(ON), improved figure-of-merit (R_DS(ON) × Q_g), and TO220F package with electrically isolated tab - reducing assembly complexity and improving safety in high-voltage systems. DMG9N65CT remains fully supported for existing production and legacy BOMs.