B4M-E3/45 Equivalent & Substitute Parts

Part Overview

The B4M-E3/45 is a single-phase bridge rectifier rated for 400 V peak reverse voltage with 500 mA average rectified current. This component is manufactured by Vishay General Semiconductor - Diodes Division and is packaged in a 4-DIP through-hole configuration (MBM package). The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. Substitute parts must maintain identical electrical performance while accommodating different mounting technologies and package formats.

Substiute Parts

B4M-E3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 766B4M-E3/45 Datasheet

Current PartRFQ

B4S-E3/80

Vishay General Semiconductor - Diodes DivisionIn Stock: 90411B4S-E3/80 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the B4M-E3/45 is determined by strict equivalence of core electrical parameters: peak reverse voltage (400 V), average rectified current (500 mA), forward voltage drop (1 V @ 500 mA), and reverse leakage current (5 µA @ 400 V). The operating temperature range (-55°C to 150°C) and diode technology (single-phase standard rectifier) must remain constant.

The primary substitute identified is the B4S-E3/80, which maintains all electrical specifications while transitioning from through-hole mounting (4-DIP MBM package) to surface-mount technology (TO-269AA MBS package). This substitution is valid for applications where PCB design accommodates surface-mount components. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and carry identical RoHS3 compliance and moisture sensitivity ratings.

Parameter Comparison

Engineering Selection Recommendations

The B4S-E3/80 is the primary substitute for the B4M-E3/45. Both parts maintain identical electrical specifications and thermal operating ranges, ensuring functional equivalence in rectification applications. The B4S-E3/80 carries active product status from Vishay General Semiconductor - Diodes Division, providing superior long-term availability compared to the obsolete B4M-E3/45. Both parts are ROHS3 compliant and carry identical moisture sensitivity ratings (MSL 1 - Unlimited).

Selection between these parts depends on PCB assembly technology. The B4M-E3/45 requires through-hole assembly with 4-DIP footprint spacing (0.200", 5.08mm). The B4S-E3/80 requires surface-mount assembly with TO-269AA footprint. Electrical performance is identical; the choice is determined by manufacturing capability and PCB design constraints.

Frequently Asked Questions (FAQ)

Q: Can the B4S-E3/80 directly replace the B4M-E3/45 in existing designs?

A: Electrical substitution is complete. However, PCB layout modification is required. The B4M-E3/45 uses through-hole 4-DIP mounting; the B4S-E3/80 uses surface-mount TO-269AA. Footprint redesign and assembly process changes are necessary.

Q: Are the electrical specifications identical between B4M-E3/45 and B4S-E3/80?

A: Yes. Both parts are rated for 400 V peak reverse voltage, 500 mA average rectified current, 1 V forward voltage drop at 500 mA, and 5 µA reverse leakage at 400 V. Operating temperature range is -55°C to 150°C for both.

Q: What is the difference between MBM and TO-269AA packages?

A: MBM is a through-hole 4-DIP package with 0.200" (5.08mm) lead spacing. TO-269AA is a surface-mount 4-BESOP package. Both are single-phase bridge rectifier packages; the difference is assembly technology and PCB footprint.

Q: Why is the B4M-E3/45 listed as obsolete?

A: The B4M-E3/45 is no longer in active production. The B4S-E3/80 represents the current active equivalent from Vishay, offering the same electrical performance in modern surface-mount packaging.

Q: Are compliance certifications identical?

A: Yes. Both B4M-E3/45 and B4S-E3/80 are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings.