Diodes Incorporated MMBD4448HTS-7-F

Overview

MMBD4448HTS-7-F from Diodes Incorporated is a surface-mount fast-switching silicon switching diode in SOT523 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 low junction-to-ambient thermal resistance (833 °C/W), suited for compact DC-DC converter feedback paths and signal routing in space-constrained portable electronics.

For engineers reviewing the MMBD4448HTS-7-F datasheet, MMBD4448HTS-7-F pinout, MMBD4448HTS-7-F application, or MMBD4448HTS-7-F equivalent, key selection criteria include ultra-fast trr ≤ 4.0 ns, low VF at 10–100 mA, tight VRM = 100 V margin, SOT523 footprint compatibility, and AEC-Q101 readiness for automotive signal conditioning.

Technical Context

This diode operates as a unidirectional, single-element silicon PN junction device optimized for high-speed on/off transitions in low-voltage logic interface and power supply control circuits. Its design emphasizes minimal charge storage and low capacitance (CT = 3.5 pF at VR = 6 V) to reduce switching losses and signal distortion.

The SOT523 package enables integration into dense PCB layouts while maintaining thermal performance under pulsed operation. The device is characterized across –55 °C to +150 °C and supports stable leakage behavior (IR ≤ 30 µA at VR = 25 V, TJ = 150 °C), making it suitable for industrial-grade timing and clamping functions.

Key Specifications

Pinout & Package

Package: SOT523 - Ultra-small plastic surface-mount package (1.60 × 1.60 × 0.55 mm), lead-free, halogen-free, RoHS-compliant, 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 BAT54C-7-F and 1N4148W-7-F, MMBD4448HTS-7-F uniquely balances 80 V VRRM, 4.0 ns trr, SOT523 miniaturization, and AEC-Q101 readiness-making it optimal for next-gen automotive and portable power management designs where size, speed, and reliability are co-constrained.

Availability

MMBD4448HTS-7-F is available at Aetrix Electronics and suitable for USB interface protection, isolated DC-DC feedback networks, and automotive CAN bus biasing requiring stable component supply across production lifecycles.

Supply support for MMBD4448HTS-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 MMBD4448HTS-7-F belongs to Diodes' high-speed switching diode product line, engineered specifically for miniaturized, high-frequency signal routing and power control in automotive, industrial, and portable electronics.

FAQ

What is the maximum junction temperature and how does it affect power dissipation?

The MMBD4448HTS-7-F has an operating junction temperature range of –55 °C to +150 °C. At 25 °C ambient, its 150 mW power dissipation rating drops linearly above 70 °C ambient per the derating curve (833 °C/W RθJA), reaching zero at ~255 °C case temperature-though practical limits are constrained by the 150 °C TJ max. This requires thermal-aware PCB layout with adequate copper pour.

Is MMBD4448HTS-7-F qualified for automotive applications?

Yes-MMBD4448HTS-7-F is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101 in this specific variant, Diodes offers AEC-Q101-qualified versions (e.g., MMBD4448HTA-7-F) with identical electrical specs and enhanced test coverage for automotive signal conditioning.

How does the SOT523 package compare to SOT23 in layout and thermal performance?

The SOT523 measures 1.60 mm × 1.60 mm × 0.55 mm-~40% smaller than standard SOT23 (3.0 mm × 1.4 mm × 1.1 mm). Its reduced footprint saves board space but lowers thermal mass; RθJA is 833 °C/W vs. ~300 °C/W for SOT23 on equivalent pads, necessitating tighter thermal management in continuous-current applications.

What is the significance of the "S" suffix in MMBD4448HTS-7-F?

The "S" denotes the marking code variant (AB per datasheet), indicating Diodes' Shenzhen manufacturing site. All HT/HTA/HTC/HTS variants share identical electrical specifications, package, and reliability testing-only date code format and assembly location differ; no functional or performance distinction exists between them.