Diodes Incorporated MB1505

Overview

MB1505 from Diodes Incorporated is a high-current silicon bridge rectifier with 50 V maximum recurrent peak reverse voltage, 15 A average rectified output current at TC = 55°C, and 1.1 V forward voltage drop at 7.5 A. It features solderable universal terminals (0.25" Faston), metal case for superior thermal conduction, and is rated for bolt-down mounting on heatsinks with thermal compound. It is used in industrial AC/DC power supplies requiring robust, high-thermal-capacity rectification.

For engineers reviewing the MB1505 datasheet, MB1505 pinout, MB1505 application, or MB1505 equivalent, key selection criteria include its 50 V VRRM rating, 15 A I(AV) capability at elevated case temperature, thermal resistance of 2.5 °C/W (junction-to-case), and UL 94V-0 case material compliance - all critical for high-reliability linear and transformer-based power conversion designs.

Technical Context

This device implements a full-wave single-phase bridge rectifier topology using four silicon diodes in a monolithic metal-packaged configuration. Its design centers on high thermal efficiency via direct metal-case heat transfer and low forward voltage to minimize conduction losses under continuous 15 A DC load conditions.

Rated for operation from –55°C to +150°C junction temperature, it supports 60 Hz resistive or inductive loads and withstands non-repetitive 300 A surge currents (8.3 ms half-sine). The 0.25" Faston terminals enable snap-on, solder, or PCB board mounting per MIL-STD-202 Method 208.

Key Specifications

Pinout & Package

Package: Metal case (UL 94V-0), bolt-down mount 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, M=30.50 mm, N=10.97–11.23 mm, P=17.10–19.10 mm. Approx. weight: 29 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBPC1505 and KBPC1505, MB1505 uniquely delivers lowest thermal resistance (2.5 °C/W), bolt-down mechanical integration, and UL-rated fire safety - making it irreplaceable in thermally demanding, safety-certified industrial rectifier roles.

Availability

MB1505 is available at Aetrix Electronics and suitable for industrial linear power supplies, welding equipment DC buses, test bench AC/DC converters, and legacy motor drive control boards requiring stable component supply and long-term manufacturability.

Supply support for MB1505 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 and manufacturing operations across Asia and the Americas.

The MB series belongs to Diodes' high-current silicon bridge rectifier product line, engineered specifically for ruggedized, thermally efficient AC/DC conversion in industrial, welding, and test equipment where reliability under sustained load and mechanical durability are paramount.

FAQ

What is the maximum case temperature at which MB1505 can deliver its full 15 A average output current?

MB1505 delivers its rated 15.0 A average rectified output current only when the case temperature (TC) is maintained at or below 55°C, as specified in the datasheet's Fig. 2 derating curve. Exceeding 55°C requires linear derating - e.g., ~10 A at TC = 100°C - due to thermal limits of the silicon junction and metal-case interface.

Can MB1505 be mounted directly to a chassis without an insulating pad?

Yes - MB1505 is designed for direct bolt-down mounting to a heatsink or conductive chassis using a #10 screw and silicone thermal compound. Its metal case is electrically connected to the (–) DC output terminal, so isolation is required only if the chassis must remain floating or at a different potential than the negative rail.

Is MB1505 lead-free and RoHS compliant?

Yes - MB1505 features a lead-free finish and is RoHS compliant per EU Directive 2002/95/EC, effective for date codes 0514 and later. Compliance includes exemptions for high-temperature solder and glass passivation as defined in Annexes 5 and 7 of the directive.

Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGN"?

The notice reflects Diodes Incorporated's recommendation to adopt the newer GBPC15 series for new designs due to improved packaging efficiency and broader distribution. However, MB1505 remains fully supported, in active production, and preferred where its metal-case thermal performance, Faston terminals, or UL 94V-0 housing provide decisive engineering advantages.