Diodes Incorporated DMN55D0UT-7

Overview

DMN55D0UT-7 from Diodes Incorporated is an N-channel enhancement-mode MOSFET in SOT523 package, rated for 50V V_DSS, 4Ω R_DS(ON) @ V_GS = 4V, and 160mA continuous drain current. It features low gate threshold voltage (0.7–1.0V), 2kV ESD protection on gate, and 25pF input capacitance - optimized for compact, low-power load switching in space-constrained portable electronics.

For engineers reviewing the DMN55D0UT-7 datasheet, DMN55D0UT-7 pinout, DMN55D0UT-7 application, or DMN55D0UT-7 equivalent, key selection criteria include its ultra-low V_GS(TH) enabling direct drive from 1.8V/2.5V logic, minimal R_DS(ON) at low gate voltages, thermal resistance of 625°C/W, and SOT523 footprint compatibility with high-density PCB layouts.

Technical Context

This discrete MOSFET operates as a single low-side switch with enhancement-mode gate control. Its 0.7–1.0V gate threshold enables reliable turn-on from sub-3V microcontroller I/O pins, while 25pF C_iss and 2.1pF C_rss support fast switching with low drive power.

The device integrates gate-to-source ESD protection diodes rated to 2kV HBM and uses a fully lead-free, halogen-free "Green" molding compound. Thermal performance is defined by R_θJA = 625°C/W on FR-4 PCB with minimum pad layout - limiting usable continuous power to 200mW at +25°C ambient.

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-plated terminals solderable per MIL-STD-202.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel low-threshold MOSFET applications.

Compared with DMN55D0UT-7, DMN53D0LT sacrifices voltage rating and on-resistance for cost, while AO3400 offers superior conduction performance but fails to guarantee turn-on below 2.5V - making DMN55D0UT-7 uniquely suited for ultra-low-voltage, space-constrained load switching.

Availability

DMN55D0UT-7 is available at Aetrix Electronics and suitable for portable medical devices, IoT sensor nodes, and wearable electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for DMN55D0UT-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

This MOSFET belongs to Diodes' DMN series of low-voltage, low-R_DS(ON) small-signal MOSFETs - engineered specifically for power-efficient load switching in battery-powered portable electronics and space-constrained embedded systems.

FAQ

Is DMN55D0UT-7 suitable for 1.8V logic-level drive?

Yes. With a guaranteed gate threshold voltage of 0.7–1.0V and typical R_DS(ON) of 3.1Ω at V_GS = 2.5V, it fully enhances using standard 1.8V GPIO outputs. The low V_GS(TH) ensures robust turn-on even with process and temperature variation, eliminating need for external level shifters in most portable designs.

What is the maximum continuous current at 85°C ambient?

At T_A = +85°C, derating applies: P_D drops to ~120mW (based on R_θJA = 625°C/W). Using R_DS(ON) = 4Ω max, the practical continuous current limit is approximately 109mA (I = √(P/R)). This is confirmed by Fig. 4 in the datasheet showing R_DS(ON) increase with junction temperature.

Does DMN55D0UT-7 have body diode reverse recovery capability?

No. As a standard silicon planar MOSFET, it includes an intrinsic parasitic body diode with soft reverse recovery characteristics, but no specified t_rr or Q_rr values. It is not rated for high-frequency synchronous rectification; use is limited to unidirectional load switching where reverse conduction is incidental or blocked externally.

Can DMN55D0UT-7 replace DMN53D0LT in existing designs?

Yes, with verification. Both share identical SOT523 package, pinout, and V_GS(TH) range, but DMN55D0UT-7 offers higher V_DSS (50V vs. 30V) and lower R_DS(ON) (4Ω vs. 5.5Ω @ V_GS = 4V). No layout change is needed, though system-level overvoltage margin and thermal performance should be rechecked.