Diodes Incorporated DMC4029SK4-13

Overview

DMC4029SK4 from Diodes Incorporated is a complementary pair enhancement-mode MOSFET in a single TO252-4 package, integrating an N-channel (40 V, 24 mΩ @ 10 V) and P-channel (–40 V, 45 mΩ @ –10 V) device for half-bridge or level-shifting power stages. It delivers 8.3 A continuous drain current (Q1) and –6.1 A (Q2) at +25°C, with fast switching (t_D(ON) = 5.3 ns / 8.7 ns) and low gate charge (19.1 nC / 21.5 nC), enabling high-efficiency DC-DC converters and backlight inverters.

For engineers reviewing the DMC4029SK4 datasheet, DMC4029SK4 pinout, DMC4029SK4 application, or DMC4029SK4 equivalent, this dual MOSFET supports synchronous rectification, bidirectional load switching, and compact power management designs where thermal performance (R_θJA = 42 °C/W under enhanced layout), low R_DS(ON), and complementary gate drive compatibility are critical selection criteria.

Technical Context

This device integrates two discrete enhancement-mode MOSFETs-N-channel and P-channel-with matched thermal characteristics and shared drain terminals. Its TO252-4 package features an exposed drain pad for low R_θJC (4.5 °C/W), supporting high-current operation without external heatsinking in space-constrained PCB layouts.

The Q1/Q2 pair operates with symmetrical ±20 V gate-source voltage ratings and exhibits tightly controlled threshold voltages (V_GS(TH) = 1.0–3.0 V / –1.0 to –3.0 V), enabling reliable turn-on at 4.5 V logic levels while maintaining low leakage (<1 µA). Body diode recovery (t_RR = 10.5 ns / 9.61 ns) and low output capacitance (C_OSS = 84 pF each) support high-frequency PWM operation up to 1 MHz.

Key Specifications

Pinout & Package

Package: TO252-4 (DPAK-4), surface-mount, thermally enhanced with exposed drain pad. Molded green compound, UL 94V-0 rated, 0.34 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DMC2038LSD-13 and SI6926ADQ-T1-GE3, the DMC4029SK4 offers superior 40 V breakdown margin, lower conduction loss at 4.5 V drive, and faster switching-making it the preferred choice for 24 V industrial DC-DC and USB-C PD applications demanding >90% efficiency above 2 A.

Availability

DMC4029SK4 is available at Aetrix Electronics and suitable for DC-DC converters, LED backlight inverters, and industrial power management systems requiring stable component supply across extended temperature ranges (–55°C to +150°C).

Supply support for DMC4029SK4 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, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The DMC4029SK4 belongs to Diodes' high-efficiency power MOSFET product line, engineered specifically for space-constrained, thermally demanding applications such as portable power supplies and automotive body electronics where low R_DS(ON) and fast switching are essential.

FAQ

What is the maximum safe operating junction temperature for DMC4029SK4?

The absolute maximum junction temperature is +150°C, verified per JEDEC JESD22-A104. Continuous operation at this limit requires strict thermal design: PCB copper area ≥1 in², 2 oz copper layers, and no adjacent heat sources. Derating begins at TJ > 125°C, where R_DS(ON) increases by ~0.5%/°C for both channels.

Can DMC4029SK4 be used in a synchronous buck converter's high-side position?

No-the P-channel device (Q2) is not rated for high-side switching in buck topologies due to its negative V_GS requirement and lack of integrated bootstrap diode. It is designed for low-side or complementary half-bridge roles. For true high-side N-channel use, a dedicated gate driver with floating supply is required.

Does DMC4029SK4 support logic-level gate drive at 3.3 V?

Q1 (N-channel) achieves partial enhancement at 3.3 V (R_DS(ON) ≈ 55 mΩ), but full specification compliance requires ≥4.5 V. Q2 (P-channel) does not turn on reliably below –4.5 V. Use with 3.3 V microcontrollers demands external level-shifting circuitry or gate driver ICs like the TC4427.

How is the common drain connection implemented internally?

The D pins (1 and 4) are electrically tied to the same internal copper leadframe and exposed thermal pad. This creates a low-inductance, low-resistance common drain node ideal for half-bridge configurations-but mandates careful PCB routing to avoid ground bounce coupling between Q1 and Q2 switching events.