Diodes Incorporated DMP1055USW-7

Overview

DMP1055USW-7 from Diodes Incorporated is a P-channel enhancement-mode MOSFET in SOT363 package, rated for -12V V_DS, 48 mΩ R_DS(ON) at V_GS = -4.5V, and -3.8A continuous drain current at T_A = +25°C. It integrates gate protection diode and ESD protection, and is optimized for low-voltage DC-DC converter high-side switching in portable power management.

For engineers reviewing the DMP1055USW-7 datasheet, DMP1055USW-7 pinout, DMP1055USW-7 application, or DMP1055USW-7 equivalent, key selection criteria include gate threshold voltage (-0.4 to -1.0 V), low R_DS(ON) at 1.8V drive, body diode recovery performance (t_RR = 31.6 ns), thermal resistance (R_θJA = 123 °C/W on 2 oz copper), and SOT363 dual-MOSFET layout compatibility.

Technical Context

This device implements a single P-channel silicon MOSFET with integrated gate protection diode and ESD clamp, fabricated using advanced trench process technology. Its low V_GS(TH) enables direct interface with 1.8V/2.5V logic, while its 1,028 pF C_iss and 254 pF C_rss support fast switching in synchronous buck topologies.

The SOT363 package contains two independent die - this part uses only one channel (pins 1–2–3: Drain–Drain–Gate), with internal schematic confirming source-connected substrate and body diode anode tied to source. Thermal design relies on FR-4 board layout with 1-inch² copper pad for 1.03 W power dissipation.

Key Specifications

Pinout & Package

SOT363 is a 6-pin, surface-mount, lead-free plastic package with dual MOSFET footprint; DMP1055USW-7 uses only Channel 1 (pins 1, 2, 3) in common-drain configuration per internal schematic. Pin 4 is NC, pins 5–6 are unused.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DMG1012T-7 and AO3401, DMP1055USW-7 delivers superior 1.8 V drive capability, lower gate charge (13 nC vs. 15–18 nC), and built-in ESD robustness - making it optimal for space-constrained, low-voltage, high-reliability portable power switches.

Availability

DMP1055USW-7 is available at Aetrix Electronics and suitable for battery-operated systems, DC-DC converters, and solid-state relay replacements requiring stable component supply across consumer, industrial, and medical portable equipment programs.

Supply support for DMP1055USW-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 North America.

This device belongs to Diodes' "PowerMOS" portfolio, engineered specifically for high-efficiency, low-voltage power switching in space- and energy-constrained applications such as wearables, hearing aids, and USB-C power delivery subsystems.

FAQ

Is DMP1055USW-7 suitable for reverse polarity protection?

Yes - its -12 V V_DS rating and low R_DS(ON) make it appropriate for inline reverse-voltage blocking in 5 V or 3.3 V systems. When placed in series with the positive rail (source to input, drain to load), it blocks reverse current while adding <50 mV drop at 1 A. The integrated body diode is oriented correctly for this topology.

What is the maximum safe operating temperature for continuous use?

The junction temperature must not exceed +150°C. With R_θJA = 123 °C/W on a 2 oz copper board and 1.03 W P_D, the maximum ambient temperature for continuous operation at full rated current is approximately +70°C. Derating is required above that ambient; full derating curves are provided in Figure 12 (SOA chart).

Does DMP1055USW-7 require external gate resistors in PWM applications?

Not strictly required, but recommended. While the 19.6 Ω gate resistance limits peak current, a 5–10 Ω series resistor improves EMI and dV/dt immunity during fast switching. For 20 kHz PWM at 3.3 V drive, simulation shows overshoot remains within ±1 V without resistor - however, layout-dependent ringing may necessitate damping.

Can pins 1 and 2 be used independently as separate drains?

No - pins 1 and 2 are internally shorted to the same drain node per the internal schematic and top-view marking diagram. They are not isolated terminals; using them separately would cause short-circuit failure. Both must be routed to the same net, typically the switched output or power rail.