MB251W Bridge Rectifier Single Phase 100V 25A Equivalent & Substitute Parts

Part Overview

The MB251W is a single-phase bridge rectifier manufactured by Micro Commercial Co, rated for 100V peak reverse voltage and 25A average rectified current. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing maintenance, repair, and legacy system support. The MB251W operates across a temperature range of -55°C to 125°C and is housed in a 4-Square MB-35W through-hole package.

Substiute Parts

MB251W

Micro Commercial CoIn Stock: 1126MB251W Datasheet

Current PartRFQ

MB251W-BP

Micro Commercial CoIn Stock: 1496MB251W-BP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MB251W is determined by electrical and mechanical parameter equivalence. The critical parameters for substitution are:

• Voltage - Peak Reverse (Max): 100 V
• Current - Average Rectified (Io): 25 A
• Voltage - Forward (Vf) (Max) @ If: 1.2 V @ 12.5 A
• Current - Reverse Leakage @ Vr: 10 µA @ 100 V
• Mounting Type: Through Hole
• Package / Case: 4-Square, MB-35W

The MB251W-BP meets all electrical specifications and maintains identical mechanical compatibility through the same package designation. The primary distinction between these parts is packaging format and product status classification.

Parameter Comparison

Engineering Selection Recommendations

The MB251W-BP is a direct electrical and mechanical equivalent to the MB251W. Both parts share identical electrical ratings and operate within the same temperature parameters. The MB251W-BP offers improved regulatory compliance, meeting ROHS3 requirements, whereas the original MB251W is RoHS non-compliant. Both parts maintain REACH Unaffected status and EAR99 export classification.

Selection between these parts depends on application requirements and regulatory constraints. The MB251W-BP is suitable for applications where RoHS3 compliance is mandated. The MB251W remains available for legacy system maintenance where original specifications must be preserved.

Frequently Asked Questions (FAQ)

Q: Can MB251W-BP replace MB251W in existing applications?

A: Yes. The MB251W-BP is electrically and mechanically equivalent. Both parts deliver identical performance across all specified electrical parameters and operate within the same temperature range. Physical compatibility is maintained through identical 4-Square MB-35W through-hole packaging.

Q: What is the difference between MB251W and MB251W-BP?

A: The primary differences are packaging format and product status. MB251W-BP is supplied in bulk packaging, whereas MB251W uses standard packaging. MB251W-BP meets ROHS3 compliance standards, while MB251W is RoHS non-compliant. Electrical specifications and thermal performance are identical.

Q: Are there any thermal or electrical performance differences?

A: No. Both parts maintain identical voltage ratings (100V peak reverse), current capacity (25A average rectified), forward voltage characteristics (1.2V @ 12.5A), and reverse leakage specifications (10µA @ 100V). Operating temperature range is -55°C to 125°C for both parts.

Q: Which part should be selected for new designs?

A: The MB251W-BP is the appropriate selection for new designs. It provides ROHS3 compliance and is classified as "Not For New Designs" only due to product lifecycle status, not technical limitations. The MB251W is obsolete and should be reserved for legacy system maintenance only.

Q: Is the through-hole package compatible with existing PCB layouts?

A: Yes. Both parts use identical 4-Square MB-35W through-hole packaging. PCB footprints, lead spacing, and mounting requirements are identical, ensuring direct mechanical compatibility without layout modifications.