Diodes Incorporated DMN3732UFB4-7

Overview

DMN3732UFB4-7 from Diodes Incorporated is a 30V N-channel enhancement-mode MOSFET in X2-DFN1006-3 package, optimized for ultra-thin load switching with R_DS(ON) = 460 mΩ @ V_GS = 4.5V, I_D = 1.3 A, and V_GS(TH) as low as 0.45 V - enabling direct battery-level gate drive in portable power management circuits.

For engineers reviewing the DMN3732UFB4-7 datasheet, DMN3732UFB4-7 pinout, DMN3732UFB4-7 application, or DMN3732UFB4-7 equivalent, this device is selected for space-constrained, low-voltage DC load control where sub-1V threshold operation, 0.6 mm² footprint, and ESD-protected gate integrity are critical design requirements.

Technical Context

This MOSFET employs a trench-gate silicon process to achieve low R_DS(ON) at V_GS ≥ 1.8 V while maintaining fast switching (t_r = 15.9 ns, t_f = 20.0 ns) and low gate charge (Q_g = 0.9 nC). Its body diode exhibits V_SD = 0.7–1.2 V at I_S = 300 mA and t_RR = 59 ns under dI/dt = 100 A/μs.

The device operates across –55°C to +150°C junction temperature, with normalized R_DS(ON) variation ≤ 1.8× over that range at V_GS = 2.5 V. Thermal resistance is R_θJA = 112 °C/W on minimum pad layout and 253 °C/W on standard FR-4 (2 oz Cu, 1″² copper).

Key Specifications

Pinout & Package

Package: X2-DFN1006-3 - 0.4 mm height, 1.0 × 0.6 mm outline, 0.35 mm pitch, NiPdAu-plated terminals, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DMN2004LK3-7 and AO3400A, DMN3732UFB4-7 uniquely balances sub-1V threshold, 0.4 mm height, and 0.6 mm² footprint - making it the sole option for battery-powered devices requiring both deep discharge operation and mechanical thickness <0.45 mm.

Availability

DMN3732UFB4-7 is available at Aetrix Electronics and suitable for smartphone power sequencing, USB-C port protection, and wireless earbud battery management requiring stable component supply across high-mix, low-volume production runs.

Supply support for DMN3732UFB4-7 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 centers across Asia and manufacturing in Taiwan and China.

This MOSFET belongs to Diodes' X2-DFN ultra-miniature power switch product line, engineered specifically for space- and power-constrained portable electronics where traditional SOT packages cannot meet mechanical or thermal targets.

FAQ

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

At T_A = +85°C with the recommended minimum pad layout, DMN3732UFB4-7 supports 0.96 A continuous drain current. This value derives from its 1.12 W power dissipation rating and R_θJA = 112 °C/W, ensuring safe operation without derating in thermally optimized wearable PCBs.

Can this MOSFET be used in reverse polarity protection circuits?

Yes - its intrinsic body diode conducts from source to drain when V_DS < 0, allowing implementation of low-loss reverse polarity protection by placing the device in series with the positive rail. The 0.7–1.2 V forward drop at 300 mA and 59 ns reverse recovery time ensure minimal voltage loss and fast fault response.

Is the X2-DFN1006-3 package compatible with standard reflow profiles?

Yes - the package is qualified for IPC/JEDEC J-STD-020 Level 1 moisture sensitivity and supports standard lead-free reflow profiles (peak 260°C, 60 s above 217°C). Its NiPdAu finish ensures robust solderability per MIL-STD-202 Method 208, even after extended storage.

Does the device require external gate resistor for stability?

No external gate resistor is required for basic switching. With Q_g = 0.9 nC and C_iss = 40.8 pF, the MOSFET turns on/off cleanly using typical MCU GPIO drivers (≤10 mA sink/source). A 10–47 Ω series resistor may be added only if ringing is observed on gate waveform during high-dV/dt noise environments.