Diodes Incorporated DMP31D1UWQ-7

Overview

DMP31D1UWQ-7 from Diodes Incorporated is a P-channel enhancement-mode MOSFET in SOT323 package, rated for -30V V_DSS, 1Ω R_DS(ON) @ V_GS = -4.5V, and -0.6A continuous drain current at +25°C. It delivers low gate threshold (-0.5 to -1.1V), fast switching (t_D(ON) = 3.8ns), and AEC-Q101 qualification for automotive power management.

For engineers reviewing the DMP31D1UWQ-7 datasheet, DMP31D1UWQ-7 pinout, DMP31D1UWQ-7 application, or DMP31D1UWQ-7 equivalent, key selection factors include its low R_DS(ON) at low gate drive, thermal resistance of 220°C/W on 1-inch copper, and ESD-protected gate for robust load-switch reliability in space-constrained DC-DC converters.

Technical Context

This MOSFET operates as a high-side load switch with gate-controlled conduction in negative-voltage rail applications. Its low V_GS(TH) enables direct interface with 1.8V/2.5V logic, while C_iss = 54pF and Q_g = 1.0nC support efficient switching up to several MHz.

The device uses silicon die in a thermally optimized SOT323 package with matte tin–annealed Alloy 42 leadframe. Its R_DS(ON) remains stable across -55°C to +150°C junction temperature, with normalized drift ≤1.7× at 150°C under V_GS = -4.5V.

Key Specifications

Pinout & Package

Package: SOT323 - surface-mount plastic package with 3 terminals, 0.006g mass, UL 94V-0 rating, and moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar P-channel load switch applications.

Compared with DMN3026LSD-13 and SI2301DS-T1-BE3, DMP31D1UWQ-7 uniquely balances automotive qualification, low-voltage gate compatibility, and green compliance in a compact SOT323 footprint-making it optimal for space- and reliability-critical 24V/12V load switching where gate drive is constrained to ≤2.5V.

Availability

DMP31D1UWQ-7 is available at Aetrix Electronics and suitable for automotive body electronics, USB-C power delivery modules, and portable medical devices requiring stable component supply, AEC-Q101 traceability, and RoHS 3 compliance.

Supply support for DMP31D1UWQ-7 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 automotive, industrial, and consumer markets.

The DMP31D1UWQ belongs to Diodes' AEC-Q101-qualified P-channel MOSFET product line, designed specifically for low-voltage, low-power load switching in space-constrained automotive and portable electronics where gate drive voltage headroom is limited.

FAQ

What is the maximum safe operating voltage for DMP31D1UWQ-7 in continuous DC applications?

The absolute maximum drain-source voltage is -30V, but continuous operation should be limited to ≤-24V to maintain 20% design margin against transients and ensure long-term reliability per AEC-Q101 stress requirements. Derating is mandatory above +85°C ambient due to R_DS(ON) increase and reduced power dissipation capability.

Can DMP31D1UWQ-7 be driven directly from a 1.8V microcontroller GPIO without level shifting?

Yes - its gate threshold range of -0.5V to -1.1V ensures reliable turn-on with 1.8V logic high (V_GS ≈ -1.8V), delivering R_DS(ON) ≤1.5Ω. Verified operation at 1.8V is documented in Figure 4 of DS45139 Rev. 2-2, confirming full enhancement at this drive level.

Does DMP31D1UWQ-7 support reverse-current blocking in battery backup circuits?

Yes - as a P-channel MOSFET with source tied to the higher potential rail, it blocks reverse current flow from drain to source when gate is pulled low. Its body diode conducts only from source to drain, enabling fail-safe isolation in coin-cell backup paths without external diodes.

What is the thermal performance difference between the two R_θJA values (287°C/W vs. 220°C/W) listed in the datasheet?

The 287°C/W value applies to standard FR-4 with minimum pad layout; 220°C/W assumes a 1-inch square copper pour - a 23% improvement. This reflects real-world PCB layout impact: adding thermal relief vias and expanding copper area directly lowers junction temperature rise by ~15°C at 0.5A, extending lifetime in sealed enclosures.