Diodes Incorporated MB151

Overview

MB151 from Diodes Incorporated is a high-current silicon bridge rectifier with 100 V peak reverse voltage (VRRM), 15 A average rectified output current (I(AV)) at TC = 55°C, and 1.1 V forward voltage drop (VF) at 7.5 A. It features solderable universal terminals (0.25" Faston), metal case for superior thermal conduction, and RoHS-compliant lead-free finish - used in industrial AC/DC power supplies and motor drive front-end rectification.

For engineers reviewing the MB151 datasheet, MB151 pinout, MB151 application, or MB151 equivalent, this page delivers verified thermal resistance (RJC = 2.5 °C/W), I²t fusing rating (373 A²s), reverse leakage (10 µA @ 25°C), mounting torque (20 in·lb max), and UL 94V-0 case compliance - all critical for high-reliability power conversion design.

Technical Context

This single-phase full-wave bridge rectifier integrates four silicon diodes in a common metal case with isolated AC input terminals and polarized (+) and (–) DC output terminals. Its thermal design centers on direct junction-to-case conduction (RJC = 2.5 °C/W) and bolt-down mounting with silicone thermal compound to a heatsink.

Rated for operation from –55°C to +150°C, it supports 60 Hz resistive or inductive loads and withstands non-repetitive surge currents up to 300 A (8.3 ms half-sine). Reverse leakage remains ≤10 µA at 25°C and ≤1.0 mA at 100°C under rated blocking voltage.

Key Specifications

Pinout & Package

Package: Metal case with four terminals - two AC inputs (labeled ~), one positive DC output (+), one negative DC output (–); mounting via #10 screw hole (H: 4.85–5.59 mm); UL 94V-0 flammability rating; 29 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBPC1505, MB151 offers 50% lower thermal resistance and mechanical mounting flexibility; compared with KBPC1510, it trades 900 V extra blocking capability for lower forward loss and smaller form factor - making it optimal for standard 100–240 VAC industrial rectification.

Availability

MB151 is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, motor drive front-end rectifiers, and welding equipment power stages requiring stable component supply and long-term BOM continuity.

Supply support for MB151 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 MB series belongs to Diodes' high-current silicon bridge rectifier product line, engineered specifically for industrial power conversion where thermal reliability, mechanical robustness, and long-lifecycle support are mandatory.

FAQ

What is the maximum case temperature for continuous operation of MB151?

The MB151 is rated for continuous operation with case temperature (TC) up to 55°C to deliver its full 15.0 A average output current. Exceeding this temperature requires derating per Figure 2 in the datasheet - e.g., at TC = 80°C, maximum I(AV) drops to approximately 11.5 A under 60 Hz resistive load conditions.

Can MB151 be mounted directly to an aluminum heatsink without insulation?

Yes - the metal case is electrically isolated from all terminals per internal construction. Mounting with silicone thermal compound between the case and heatsink is required for optimal thermal transfer, and no electrical isolation pad is needed unless system-level isolation requirements dictate otherwise.

Is MB151 suitable for use in medical equipment?

No - Diodes Incorporated explicitly states that MB15(W)/25(W)/35(W) devices are "NOT RECOMMENDED FOR USE IN LIFE SUPPORT SYSTEMS" where failure may directly threaten life or cause injury. Medical-grade alternatives with full ISO 13485 traceability and enhanced screening must be selected instead.

What does the "W" suffix mean in MB151W, and how does it differ from MB151?

The "W" suffix denotes wire-lead termination instead of Faston terminals. MB151W uses tinned copper leads (0.125" diameter) for solder-in mounting, while MB151 has 0.25" Faston lugs for snap-on or bolted connections. Mechanical dimensions and electrical specs are identical; only terminal type differs.