Diodes Incorporated DMHC4035LSD-13

Overview

DMHC4035LSD from Diodes Incorporated is a 40V complementary enhancement-mode MOSFET H-bridge in SO-8 package, integrating two N-channel (40V, 45mΩ @ 10V) and two P-channel (-40V, 65mΩ @ -10V) devices for bidirectional DC motor control. It delivers 4.5A N-channel and -3.7A P-channel continuous drain current at 25°C with low gate charge (12.5nC/11.1nC) and fast switching (t_D(off) = 15ns/36.3ns), enabling efficient PWM-driven motor drives in compact industrial actuators.

For engineers reviewing the DMHC4035LSD datasheet, DMHC4035LSD pinout, DMHC4035LSD application, or DMHC4035LSD equivalent, key selection criteria include verified H-bridge topology compatibility, SO-8 thermal performance (R_θJA = 85°C/W), gate drive voltage range (±20V), body diode conduction capability, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This H-bridge integrates four discrete MOSFETs-two matched N-channel and two matched P-channel-on a single SO-8 substrate, eliminating external interconnect parasitics and ensuring symmetrical timing between high-side and low-side switches. Its complementary configuration enables full-bridge operation without external level-shifting circuitry for the P-channel gates.

The device uses trench-gate silicon technology to achieve low R_DS(on) at low V_GS (58mΩ N-ch @ 4.5V; 100mΩ P-ch @ -4.5V), supports 100% duty-cycle operation via thermally robust FR-4 mounting (1.5W P_D), and features tightly controlled gate threshold voltages (1–3V for N-ch; -1 to -3V for P-ch) to minimize shoot-through risk during commutation.

Key Specifications

Pinout & Package

Package: SO-8 surface-mount plastic package with matte tin-plated copper leadframe (UL 94V-0, MSL Level 1), 0.074g mass, optimized for thermal dissipation on 2oz FR-4 PCB with 1-inch² copper pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar H-bridge MOSFET applications.

Compared with DMHC3025LSD-13, DMHC4035LSD trades 10V higher breakdown for 10% higher R_DS(on), making it preferable for 24V industrial systems with inductive transients; versus SI4532DY, its monolithic integration eliminates gate skew and reduces BOM count by four passive components.

Availability

DMHC4035LSD is available at Aetrix Electronics and suitable for automotive power window modules, industrial linear actuators, medical infusion pumps, and consumer robotics requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for DMHC4035LSD 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 centers across Asia and manufacturing in China, Taiwan, and the US.

This device belongs to Diodes' Automotive-Grade Power MOSFET family, engineered specifically for reliable bidirectional motor control in harsh environments where thermal stability, gate drive simplicity, and qualification rigor are mandatory.

FAQ

What is the maximum safe operating voltage for DMHC4035LSD in continuous DC motor drive?

The absolute maximum V_DSS is ±40V for both N- and P-channel devices. For continuous operation with safety margin, Diodes specifies 24V nominal bus use with transient clamping to ≤36V. Exceeding 36V risks avalanche-induced degradation during motor back-EMF events, especially at elevated junction temperatures above 125°C.

Can DMHC4035LSD be used with 3.3V microcontroller GPIOs without gate drivers?

No. At V_GS = 3.3V, N-channel R_DS(on) rises to ~120mΩ and P-channel exceeds 200mΩ, causing excessive conduction loss and thermal runaway above 1A. A minimum 4.5V gate drive is required for rated current; dedicated level-shifting gate drivers (e.g., TC4427) are mandatory for 3.3V logic interfacing.

How does the internal source tie (Pins 2 and 7) affect PCB layout for motor current paths?

Pins 2 and 7 are internally shorted to form a common source node for all four MOSFETs - this must be routed as a single low-inductance, high-current copper pour connecting to motor ground. Splitting this net or adding vias between Pins 2/7 introduces asymmetry, increasing shoot-through risk and EMI due to unequal loop inductance in the two half-bridges.

Is thermal derating required when operating DMHC4035LSD at 70°C ambient temperature?

Yes. At T_A = 70°C, the N-channel continuous current drops from 4.5A to 3.5A and P-channel from -3.7A to -2.9A per datasheet ratings. This is due to junction-to-ambient thermal resistance (85°C/W); maintaining T_J ≤ 150°C requires either reducing load current or enhancing PCB copper area beyond the 1-inch² reference layout.