MB4S Bridge Rectifier Single Phase 400V 500mA Equivalent & Substitute Parts

Part Overview

The MB4S is a single-phase bridge rectifier rated for 400V peak reverse voltage with 500mA average rectified current in a 4-SOIC surface mount package. This component is classified as "Not For New Designs" by the manufacturer (onsemi), making identification of active equivalent and substitute parts essential for ongoing production support and design continuity. The MB4S remains in inventory with 17,200 units available, but alternative parts with active product status provide long-term supply assurance and design flexibility.

Substiute Parts

MB4S

onsemiIn Stock: 17239MB4S Datasheet

Current PartRFQ

MB4S-E3/80

Vishay General Semiconductor - Diodes DivisionIn Stock: 55651MB4S-E3/80 Datasheet

DirectRFQ

B4S-E3/80

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

Parametric EquivalentRFQ

MB4STR

SMC Diode SolutionsIn Stock: 1189MB4STR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MB4S is determined by matching the following critical electrical and mechanical parameters:

• Diode Type: Single Phase
• Technology: Standard
• Voltage - Peak Reverse (Max): 400 V
• Current - Average Rectified (Io): 500 mA
• Operating Temperature Range: -55°C to 150°C (TJ)
• Mounting Type: Surface Mount
• Package / Case: TO-269AA, 4-BESOP

All identified substitute parts meet these core requirements. Substitute parts are categorized as follows:

Direct Manufacturer Substitute (MB4S-E3/80): Identical electrical specifications with active product status from Vishay General Semiconductor - Diodes Division. Package designation is TO-269AA (MBS), equivalent to the original 4-BESOP footprint.

Parametric Equivalents (B4S-E3/80, MB4STR): Parts meeting all critical electrical parameters with identical package compatibility. B4S-E3/80 is supplied in Tape & Reel packaging; MB4STR is supplied by SMC Diode Solutions in Tape & Reel format. Both maintain full electrical and thermal equivalence to the MB4S.

Parameter Comparison

Engineering Selection Recommendations

For Long-Term Supply Assurance: MB4S-E3/80 (Vishay General Semiconductor - Diodes Division) is the recommended primary substitute. This part carries active product status and is available in higher inventory (55,607 units). It is a direct manufacturer equivalent with identical electrical specifications and ROHS3 compliance.

For Alternative Sourcing: B4S-E3/80 (Vishay) and MB4STR (SMC Diode Solutions) are parametric equivalents suitable for applications where supply diversification is required. Both maintain full electrical and thermal compatibility with the MB4S. B4S-E3/80 offers the highest inventory availability (90,400 units) and active product status. MB4STR provides a third-source option with active status and lower inventory (1,088 units).

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original MB4S certification profile. MSL rating of 1 (Unlimited) is confirmed for MB4S-E3/80 and B4S-E3/80, ensuring equivalent moisture handling requirements.

Packaging Compatibility: All substitute parts use the TO-269AA, 4-BESOP package footprint, ensuring direct PCB layout compatibility with existing MB4S designs without layout modification.

Frequently Asked Questions (FAQ)

Q: Can MB4S-E3/80 be used as a direct replacement for MB4S in production?

A: Yes. MB4S-E3/80 meets all critical electrical parameters (400V peak reverse, 500mA average rectified current, 1V forward voltage, 5µA reverse leakage) and operates across the identical temperature range (-55°C to 150°C). The TO-269AA, 4-BESOP package is footprint-compatible. Both parts are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between MB4S-E3/80 and B4S-E3/80?

A: Both are Vishay products with identical electrical specifications and package compatibility. The primary difference is packaging format: MB4S-E3/80 is supplied in Cut Tape (CT) & Digi-Reel format, while B4S-E3/80 is supplied in Tape & Reel (TR) format. B4S-E3/80 has higher inventory availability (90,400 units vs. 55,607 units). Electrical performance is equivalent.

Q: Is MB4STR suitable for applications requiring MSL 1 rating?

A: MB4STR specifications do not explicitly state MSL rating in the provided data. For applications with strict moisture sensitivity requirements, MB4S-E3/80 or B4S-E3/80 are preferred, as both confirm MSL 1 (Unlimited) rating.

Q: Why is the MB4S marked "Not For New Designs"?

A: This designation indicates the manufacturer (onsemi) is not recommending this part for new product development. However, the part remains in production with adequate inventory (17,200 units) for existing design support. For new designs, MB4S-E3/80, B4S-E3/80, or MB4STR are recommended alternatives with active product status.

Q: Are there any electrical performance differences between the substitute parts?

A: All substitute parts match the MB4S in peak reverse voltage (400V), average rectified current (500mA), reverse leakage (5µA @ 400V), and operating temperature range (-55°C to 150°C). Forward voltage specification for MB4S-E3/80 is rated at 400mA instead of 500mA, but remains within the 1V maximum specification. This minor difference does not affect functional compatibility.

Q: Can these parts be used interchangeably in existing MB4S designs?

A: Yes. All substitute parts share identical TO-269AA, 4-BESOP package footprints and electrical specifications within the defined parameters. No PCB layout changes or circuit modifications are required for substitution.