Diodes Incorporated MB354

Overview

MB354 from Diodes Incorporated is a high-current silicon bridge rectifier with 400 V maximum recurrent peak reverse voltage, 35.0 A average rectified output current at TC = 55°C, and 400 A peak forward surge current (8.3 ms half-sine), designed for industrial AC/DC power conversion in switch-mode power supplies and motor drive front-ends.

For engineers reviewing the MB354 datasheet, MB354 pinout, MB354 application, or MB354 equivalent, key selection criteria include thermal resistance (R_JC = 2.5 °C/W), faston terminal mounting compatibility, UL 94V-0 case material, and RoHS-compliant lead-free finish (date code 0514+).

Technical Context

This device implements a single-phase full-wave bridge configuration using four high-conductivity silicon diodes in a metal-case package. It supports universal mounting-snap-on, solder, or PCB-with bolt-down heat-sink integration requiring silicone thermal compound for optimal junction-to-ambient thermal transfer.

Rated for operation from –55°C to +150°C, it delivers stable rectification under resistive or inductive 60 Hz loads, with reverse leakage limited to 10 µA at 25°C and 1.0 mA at 100°C across its rated blocking voltage.

Key Specifications

Pinout & Package

Package: Metal case with 0.25" faston terminals; UL 94V-0 flammability rating; 29 g mass; bolt-down mounting with #10 screw hole (H: 4.85–5.59 mm); dimensions A=28.40–28.70 mm, B=10.97–11.23 mm, C=15.50–17.60 mm, E=22.86–25.40 mm, G=13.30–15.30 mm, J=17.10–19.10 mm, K=10.40–12.40 mm, L=0.97–1.07 mm, M=30.50 mm, N=10.97–11.23 mm, P=17.10–19.10 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current bridge rectifier applications.

Compared with MB354, GBPC3504 offers PCB integration but sacrifices thermal performance and mechanical ruggedness, while KBPC3504 retains metal construction but lacks RoHS compliance and has higher thermal resistance-making MB354 optimal for new designs demanding reliability, thermal headroom, and regulatory alignment.

Availability

MB354 is available at Aetrix Electronics and suitable for industrial switch-mode power supplies, AC motor drive front-ends, and uninterruptible power supplies requiring stable component supply and long-term manufacturability.

Supply support for MB354 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 the Americas.

The MB series bridges belong to Diodes' high-current rectifier product line, engineered specifically for ruggedized AC/DC conversion in industrial power systems where thermal resilience, mechanical durability, and safety certification are mandatory.

FAQ

What is the recommended heatsink mounting method for MB354?

MB354 must be bolted directly to a heatsink using a #10 screw with maximum torque of 20 in·lb. A layer of silicone thermal compound is required between the metal case and heatsink surface to minimize thermal resistance and ensure junction temperature remains within –55°C to +150°C limits under 35 A load.

Does MB354 support both AC line frequencies (50 Hz and 60 Hz)?

Yes-MB354 is rated for 60 Hz resistive or inductive loads per datasheet Figure 1 and Figure 2, and its 400 V V_RRM and 35 A I(AV) specifications apply equivalently at 50 Hz. No derating is specified for 50 Hz operation, confirming full compatibility with global AC mains standards.

Is MB354 suitable for use in life support systems?

No-Diodes Incorporated explicitly states that MB354 is "NOT RECOMMENDED FOR USE IN LIFE SUPPORT SYSTEMS" where failure could directly threaten life or cause injury. It lacks expressed written approval for such applications and is intended solely for industrial and commercial power conversion.

What does the "W" suffix mean in MB354W, and how does it differ from MB354?

The "W" suffix denotes wire leads instead of faston terminals. MB354W replaces the 0.25" faston lugs with tinned copper wire leads (length not specified in DS21303 Rev. 7–3), making it suitable for chassis wiring or solder-mount applications-but eliminating snap-on or bolt-down mounting flexibility inherent to the standard MB354 metal-case variant.