Diodes Incorporated MMBD4448DW-7

Overview

MMBD4448DW from Diodes Incorporated is a dual, isolated, surface-mount silicon switching diode in SOT363 package, rated for 75 V peak repetitive reverse voltage, 500 mA forward current, and 4.0 ns reverse recovery time, used in high-speed signal routing and level-shifting circuits in telecom interface modules.

For engineers reviewing the MMBD4448DW datasheet, MMBD4448DW pinout, MMBD4448DW application, or MMBD4448DW equivalent, key selection criteria include reverse recovery speed, dual-element isolation, low junction capacitance (4.0 pF), thermal resistance (625 °C/W), and JEDEC-qualified reliability for industrial control and data line protection designs.

Technical Context

This dual diode features two electrically isolated P-N junctions in a single SOT363 package, enabling independent signal path management without cross-coupling. Each element supports fast switching with t_RR ≤ 4.0 ns under 10 mA test conditions and exhibits low forward voltage drop (0.72 V at 5 mA).

The device operates across –55 °C to +150 °C, with thermal derating beginning at 25 °C ambient and full power dissipation (200 mW) limited to that temperature. Its 4.0 pF total capacitance at 0 V bias and 1 MHz makes it suitable for <100 MHz digital signal conditioning.

Key Specifications

Pinout & Package

Package: SOT363 - 6-pin miniature plastic surface-mount package with gull-wing leads, moisture sensitivity level 1, lead-free matte tin plating over Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual switching diode applications.

Compared with BAV99W-7-F and DMN2041LW-7, the MMBD4448DW uniquely delivers 4.0 ns t_RR and 75 V V_RRM in a dual-isolated configuration-critical for high-fidelity signal routing where timing skew and voltage margin cannot be compromised.

Availability

MMBD4448DW is available at Aetrix Electronics and suitable for high-speed data line clamping, logic-level translation, dual-rail signal steering, and current-sense diode pair applications requiring stable component supply and JEDEC-qualified reliability.

Supply support for MMBD4448DW 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.

The MMBD4448DW belongs to Diodes' general-purpose switching diode product line, engineered for high-speed, low-capacitance signal routing in space-constrained industrial and communications equipment.

FAQ

What is the maximum continuous forward current rating for each diode element?

Each diode element in the MMBD4448DW is rated for 500 mA continuous forward current at TA = +25°C with proper PCB thermal relief (1 inch², 2 oz copper). Derating begins linearly above 25°C ambient, reaching zero power at +150°C per the published derating curve.

Is the MMBD4448DW suitable for automotive applications?

The MMBD4448DW is not AEC-Q101 qualified. Diodes Incorporated offers automotive-grade equivalents (e.g., MMBD4448DWQ-7-F) with PPAP documentation, IATF 16949 manufacturing, and AEC-Q101 stress testing-required for under-hood or safety-critical vehicle systems.

How does the dual-isolated configuration differ from common-cathode or common-anode variants?

The MMBD4448DW provides two fully isolated P-N junctions (A1/C1 and A2/C2) with no internal connection between elements. Unlike common-cathode (e.g., BAV99) or common-anode packages, this allows independent biasing, separate return paths, and elimination of inter-element leakage coupling in precision analog or fault-tolerant digital designs.

What is the significance of the "NC" pins in the SOT363 package?

Pins 3 and 4 are internally unconnected (NC) with no bond wires or die attachment. They serve mechanical stabilization and thermal mass roles in the molded package. Layout best practice requires leaving them unconnected-neither tied to ground nor routed-to avoid parasitic coupling or solder bridging risks.