Diodes Incorporated DMC4040SSDQ-13

Overview

DMC4040SSDQ-13 from Diodes Incorporated is a complementary pair enhancement-mode MOSFET in a single SO-8 package, integrating an n-channel (40V, 25mΩ @ 10V) and p-channel (−40V, 25mΩ @ −10V) device matched for balanced conduction. It delivers 7.5A/−7.3A continuous drain current at 25°C, supports AEC-Q101 automotive qualification, and targets high-efficiency half-bridge and 3-phase BLDC motor drive stages.

For engineers reviewing the DMC4040SSDQ-13 datasheet, DMC4040SSDQ-13 pinout, DMC4040SSDQ-13 application, or DMC4040SSDQ-13 equivalent, key selection criteria include matched R_DS(ON) across channels, SO-8 thermal performance (R_θJA = 58°C/W with two active dies), gate charge asymmetry (Q_g = 37.6nC / 33.7nC), and AEC-Q101 compliance for automotive motor control.

Technical Context

This dual MOSFET implements a thermally coupled complementary pair optimized for synchronous rectification and bidirectional switching in compact motor drivers. Its matched on-resistance ensures balanced power dissipation between n- and p-channel arms under PWM operation, minimizing shoot-through risk and conduction loss imbalance in H-bridge topologies.

The device features asymmetric gate drive characteristics: n-channel Q1 has lower gate resistance (1.03Ω) and faster turn-off delay (24.3ns), while p-channel Q2 exhibits higher gate resistance (6.43Ω) and longer turn-off delay (53.7ns), requiring careful gate driver timing calibration to avoid cross-conduction.

Key Specifications

Pinout & Package

Package: SO-8, 8-pin surface-mount plastic package with matte tin annealed terminals, moisture sensitivity level 1, and UL 94V-0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DMC3028LSDQ-13 and SI6926ADQ-T1-GE3, the DMC4040SSDQ-13 uniquely combines AEC-Q101 qualification, tightly matched R_DS(ON), and 40V rating-making it the only option qualified for automotive BLDC systems requiring both functional safety and thermal balance.

Availability

DMC4040SSDQ-13 is available at Aetrix Electronics and suitable for automotive motor control, industrial fan drives, CCFL backlight inverters, and EPS assist systems requiring stable component supply across multi-year production cycles.

Supply support for DMC4040SSDQ-13 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 management and signal integrity solutions for automotive, industrial, and computing markets.

The DMC4040SSDQ belongs to Diodes' Automotive-Grade Power MOSFET product line, engineered specifically for space-constrained, thermally demanding motor control applications requiring AEC-Q101 compliance and matched complementary performance.

FAQ

What is the maximum junction temperature for continuous operation?

The DMC4040SSDQ-13 has a rated operating junction temperature range of −55°C to +150°C. Continuous operation at T_J = 150°C is permitted only when power dissipation remains within the derated limit defined by R_θJA = 58°C/W for two active dies on a 25mm × 25mm FR4 PCB with 1oz copper.

Does this device require negative gate drive for the p-channel FET?

Yes-the p-channel Q2 requires a gate-source voltage of −10V (relative to its source terminal) to achieve its specified 25mΩ R_DS(ON). Gate drivers must provide true negative swing capability, not just pull-down to ground, to ensure full enhancement and avoid excessive conduction loss.

How is thermal performance affected when both MOSFETs operate simultaneously?

When both Q1 and Q2 conduct simultaneously (e.g., during dead-time overlap or shoot-through), total power dissipation is additive, and thermal resistance drops to R_θJA = 58°C/W (per the datasheet Note 9). This reflects improved heat spreading across the shared SO-8 lead frame, enabling 1.8W combined continuous dissipation before derating begins.

Can this part replace discrete n-channel and p-channel MOSFETs in an existing design?

Yes-DMC4040SSDQ-13 replaces two discrete SO-8 MOSFETs with identical pin-compatible layout (D1/S1/G1/S2/G2/D2), reducing PCB area by 35%, eliminating interconnect inductance, and improving thermal coupling. Layout changes are limited to merging gate drive traces and verifying gate driver sink/source capability for Q2's negative swing.