Diodes Incorporated DMP31D7LT-13

Overview

DMP31D7LT-13 from Diodes Incorporated is a P-channel enhancement-mode MOSFET in SOT523 package, rated for -30V V_DSS, 0.9Ω R_DS(ON) @ V_GS = -10V, and -0.5A continuous drain current at +25°C. It delivers low gate threshold voltage (-1 to -2.6V), fast switching (t_D(ON) = 30ns), and ESD-protected gate - optimized for compact, high-efficiency load switching in space-constrained DC-DC converters.

For engineers reviewing the DMP31D7LT-13 datasheet, DMP31D7LT-13 pinout, DMP31D7LT-13 application, or DMP31D7LT-13 equivalent, key selection criteria include verified R_DS(ON) at -4.5V (1.7Ω), thermal resistance (377°C/W with 1-inch copper pad), body diode forward voltage (-0.8 to -1.2V), and SOT523 mechanical compatibility with ultra-low-profile PCB layouts.

Technical Context

This MOSFET operates as a single-polarity, voltage-controlled power switch with fully specified gate threshold (V_GS(TH) = -1 to -2.6V) and guaranteed R_DS(ON) across temperature (-55°C to +150°C). Its low input capacitance (C_iss = 19pF) and gate charge (Q_g = 0.36nC) enable efficient operation in high-frequency synchronous buck stages.

The device integrates an intrinsic body diode with V_SD = -0.8 to -1.2V at -0.23A and supports pulsed drain currents up to -2.6A (10µs, 1% duty). Thermal performance is characterized under two PCB conditions: 488°C/W (minimum pad) and 377°C/W (1-inch copper plate), enabling accurate junction temperature estimation in real designs.

Key Specifications

Pinout & Package

Package: SOT523 - ultra-small surface-mount plastic package (1.60 × 1.60 × 0.75 mm), moisture sensitivity level 1, matte tin annealed terminals, UL 94V-0 rated molding compound.

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 AO3401, DMP31D7LT-13 uniquely balances ultra-small SOT523 size, verified -4.5V drive capability, and sub-1Ω R_DS(ON), making it optimal for miniaturized, logic-level-controlled load switching where thermal margin and gate drive simplicity are critical.

Availability

DMP31D7LT-13 is available at Aetrix Electronics and suitable for DC-DC converters, USB power switches, and always-on backup power paths requiring stable component supply, long-term lifecycle support, and traceable green sourcing.

Supply support for DMP31D7LT-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

DMP31D7LT-13 belongs to Diodes' low-voltage power MOSFET product line, engineered specifically for space-constrained, high-efficiency load switching in portable, IoT, and automotive subsystem applications.

FAQ

What is the maximum continuous drain current for DMP31D7LT-13 at +70°C ambient?

The maximum continuous drain current is -0.28A at TA = +70°C, as specified in the Absolute Maximum Ratings table. This derating reflects thermal limitations under standard FR-4 PCB conditions with 1-inch copper pad (RθJA = 377°C/W). Exceeding this current risks junction temperature exceeding 150°C.

Does DMP31D7LT-13 require external gate protection against ESD?

No - the device integrates on-chip ESD protection on the gate terminal, rated to >2kV HBM per industry standard. This eliminates the need for external gate resistors or TVS diodes in typical handling and circuit operation, simplifying layout and improving reliability in automated assembly.

Can DMP31D7LT-13 be driven directly by a 3.3V microcontroller GPIO?

Yes - its gate threshold voltage range (-1 to -2.6V) and guaranteed R_DS(ON) of 1.7Ω max at V_GS = -4.5V ensure reliable enhancement with 3.3V logic (V_GS ≈ -3.3V relative to source). No level shifter is required, though series gate resistance may be added for EMI control.

What is the thermal resistance junction-to-ambient for DMP31D7LT-13 on a standard PCB?

Two values are specified: 488°C/W for minimum recommended pad layout (FR-4, 2oz Cu), and 377°C/W when mounted on a 1-inch square copper plate (same board type). The latter is more representative of thermally enhanced layouts used in power-sensitive applications.