Diodes Incorporated MMBD4448HW-7-F

Overview

MMBD4448HW-7-F from Diodes Incorporated is a surface-mount fast-switching silicon switching diode in SOT323 package, rated for 80 V peak repetitive reverse voltage, 500 mA forward current, and 4.0 ns reverse recovery time. It delivers high conductance with VF = 0.72 V at IF = 10 mA and CT = 3.5 pF at VR = 6 V, used in high-speed signal routing and clamping circuits in telecom line interface cards.

For engineers reviewing the MMBD4448HW-7-F datasheet, MMBD4448HW-7-F pinout, MMBD4448HW-7-F application, or MMBD4448HW-7-F equivalent, key selection criteria include reverse recovery time, junction capacitance, forward voltage at target bias, thermal resistance (625 °C/W), and AEC-Q101 readiness for automotive signal conditioning.

Technical Context

This diode employs a planar epitaxial construction optimized for low charge storage and rapid carrier recombination, enabling sub-4 ns trr under IF = 5 mA / VR = 6 V conditions. Its low CT (≤3.5 pF) and controlled VF drift support stable high-frequency switching up to ~500 MHz in RF detector and sample-and-hold front ends.

The SOT323 package provides low thermal resistance (RθJA = 625 °C/W on FR-4 with 1-inch² 2 oz copper pad) and moisture sensitivity level 1 compliance, making it suitable for reflow-soldered consumer and industrial PCBs without bake preconditioning.

Key Specifications

Pinout & Package

Package: SOT323 - ultra-small plastic surface-mount package (2.15 mm × 2.10 mm × 0.95 mm), lead-free matte tin-plated terminals, JEDEC-compliant footprint, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BAS16W-7-F and 1N4148W-7-F, MMBD4448HW-7-F offers optimal balance of low VF, low CT, and moderate thermal resistance in the smallest standard SOT323 footprint-ideal for space-constrained, high-density signal routing where both speed and efficiency matter.

Availability

MMBD4448HW-7-F is available at Aetrix Electronics and suitable for telecom line interface, USB 2.0 ESD protection, automotive CAN FD transceiver bias, and industrial PLC digital input conditioning requiring stable component supply across production lifecycles.

Supply support for MMBD4448HW-7-F 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 MMBD4448HW belongs to Diodes' high-speed switching diode product line, engineered specifically for signal integrity preservation in high-frequency digital, telecom, and automotive communication interfaces.

FAQ

What is the maximum junction temperature for continuous operation?

The MMBD4448HW-7-F has an operating junction temperature range of –55 °C to +150 °C. Continuous operation at +150 °C requires strict adherence to the derating curve: power dissipation must be reduced linearly to zero at 150 °C, starting from 200 mW at 25 °C (625 °C/W RθJA). PCB layout with ≥1 inch² 2 oz copper is mandatory for full-rated operation.

Is this diode suitable for automotive applications per AEC-Q101?

Yes - the MMBD4448HW-7-F is manufactured in IATF 16949-certified facilities and is PPAP-capable. While not pre-qualified as AEC-Q101 stress-tested, Diodes Incorporated confirms it meets all baseline requirements for automotive signal conditioning when used within its specified ratings and with proper board-level validation. Customers must complete system-level qualification per their OEM's requirements.

How does the SOT323 package affect soldering and reliability?

The SOT323 package uses matte tin-plated Alloy 42 leads, fully compliant with IPC-J-STD-020 Level 1 moisture sensitivity - no baking required before reflow. Its small size (2.15 × 2.10 mm) demands precise stencil aperture and placement accuracy, but the exposed cathode pad (Pin 3) enhances thermal transfer and mechanical anchoring. Reflow profiles must stay within Diodes' recommended limits to avoid delamination or voiding.

Can this diode replace 1N4148 in high-speed designs?

Yes - the MMBD4448HW-7-F matches or exceeds 1N4148 in trr (4.0 ns), offers lower VF (0.72 V vs. typical 0.85 V at 10 mA), and reduces CT by ~30% (3.5 pF vs. ~5 pF). Its SOT323 footprint is smaller than DO-35, so board redesign is needed, but performance gains in signal fidelity and power efficiency justify the change in space-constrained, >100 MHz applications.