Diodes Incorporated DMC21D1UDA-7B

Overview

DMC21D1UDA-7B from Diodes Incorporated is a complementary pair enhancement-mode MOSFET (N-channel + P-channel) in a single ultra-small X2-DFN0806-6 package, rated for ±20V V_DSS, with R_DS(ON) as low as 0.99Ω @ 4.5V (Q1) and 1.9Ω @ –4.5V (Q2), delivering 455mA/–328mA continuous drain current at 25°C - optimized for space-constrained power management and analog switching in portable electronics.

For engineers reviewing the DMC21D1UDA-7B datasheet, DMC21D1UDA-7B pinout, DMC21D1UDA-7B application, or DMC21D1UDA-7B equivalent, key selection criteria include dual-channel complementary operation, sub-1V gate threshold (max 1.0V / min –1.0V), ultra-low input capacitance (C_iss = 31pF / 28.5pF), fast switching (t_F = 12ns / 15.4ns), and thermal resistance of 419°C/W on FR-4 PCB.

Technical Context

This device integrates matched N- and P-channel MOSFETs in one die-cast package to enable compact half-bridge, level-shifting, and bidirectional load-switching topologies. Its symmetric gate threshold (±0.4–1.0V) and low R_DS(ON) across 1.5–4.5V drive voltages support direct interfacing with 1.8V/2.5V/3.3V logic without level shifters.

The dual-gate protection diodes per channel, combined with ESD protection and <1000ppm antimony/halogen-free "Green" construction, ensure robustness in handheld and wearables applications where board area, voltage headroom, and environmental compliance are critical design constraints.

Key Specifications

Pinout & Package

Package: X2-DFN0806-6 - ultra-compact 0.8mm × 0.6mm × 0.36mm body with exposed thermal pad, RoHS-compliant matte tin finish, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar complementary MOSFET switching applications.

Compared with DMC2038LSD-7 and DMC2040UDM-7, the DMC21D1UDA-7B uniquely delivers true complementary switching in <0.5mm² area with 1V-threshold logic compatibility - essential for next-gen wearables where size, voltage scalability, and integration density are non-negotiable.

Availability

DMC21D1UDA-7B is available at Aetrix Electronics and suitable for USB-C accessory power management, wearable sensor multiplexing, low-voltage LED dimming, and IoT edge node sequencing requiring stable component supply and long-term lifecycle assurance.

Supply support for DMC21D1UDA-7B 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with design centers across Asia, Europe, and the US, serving consumer, computing, communications, industrial, and automotive markets.

The DMC series targets ultra-miniature power switching applications, emphasizing low-voltage logic compatibility, high-density packaging, and environmental compliance - directly addressing miniaturization and sustainability demands in portable electronics.

FAQ

What is the maximum continuous drain current for each channel at 70°C ambient?

At T_A = +70°C, the N-channel (Q1) supports 365mA and the P-channel (Q2) supports –262mA under steady-state conditions on FR-4 PCB with minimum recommended pad layout. Derating follows the R_θJA = 419°C/W thermal model, and pulsed operation (1% duty cycle) allows up to 1500mA/–1000mA peak.

Does DMC21D1UDA-7B require external gate resistors for typical 1.8V GPIO switching?

No external gate resistor is required for basic on/off control from 1.8V GPIO, as V_GS(TH) max is 1.0V (Q1) and –1.0V (Q2). However, a 10–47Ω series resistor is recommended for EMI suppression and ringing control when driving at >1MHz PWM frequencies or into capacitive loads >100pF.

How is thermal performance affected by PCB layout?

Thermal resistance drops from 419°C/W (minimum pad) to ~220°C/W with a 25mm² copper pour connected to the exposed thermal pad via ≥4 thermal vias (0.3mm diameter). Without thermal pad connection, junction temperature rise exceeds safe limits above 150mA continuous, risking parametric shift and reliability degradation.

Can this device replace discrete N+P MOSFETs in an existing half-bridge design?

Yes - provided the original design uses matched N/P pairs with V_DSS ≥ ±20V, I_D ≥ 455mA/–328mA, and gate drive compatible with ±1.0V thresholds. Pinout differs (X2-DFN0806-6 vs. SOT-363), so layout revision is required; however, gate drive timing, R_DS(ON), and SOA curves are directly comparable per datasheet Figures 12 and 24.