CDNBS04-B08400 Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The CDNBS04-B08400 is a single-phase bridge rectifier manufactured by Bourns Inc., rated for 400 V peak reverse voltage and 800 mA average rectified current. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement planning. The part is RoHS3 compliant and features unlimited moisture sensitivity level (MSL 1), suitable for industrial and commercial applications requiring reliable rectification in surface mount configurations.

Substiute Parts

CDNBS04-B08400

Bourns Inc.In Stock: 12625CDNBS04-B08400 Datasheet

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CD-MBL104S

Bourns Inc.In Stock: 777CD-MBL104S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDNBS04-B08400 is determined by the following critical electrical and mechanical parameters:

• Voltage Rating: Peak reverse voltage must equal or exceed 400 V
• Current Rating: Average rectified current must meet or exceed 800 mA
• Diode Configuration: Single-phase bridge rectifier topology
• Forward Voltage Characteristics: Maximum forward voltage drop at rated current
• Reverse Leakage: Maximum reverse leakage current at rated voltage
• Operating Temperature Range: Must support the required thermal envelope
• Mounting Technology: Surface mount compatibility
• Compliance Standards: RoHS3 compliance and MSL rating

The CD-MBL104S qualifies as a functional substitute based on matching or exceeding all critical electrical parameters while maintaining surface mount compatibility and equivalent compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The CD-MBL104S is a qualified substitute for the obsolete CDNBS04-B08400 based on the following factors:

• Electrical Compatibility: The substitute meets all minimum electrical requirements with equivalent or superior performance across voltage, current, and leakage specifications.
• Thermal Performance: Extended operating temperature range (-55°C to 175°C) provides additional margin compared to the original part (-55°C to 150°C).
• Production Status: The CD-MBL104S is in active production, ensuring long-term availability and supply chain continuity.
• Regulatory Compliance: Both parts maintain ROHS3 compliance and identical MSL ratings, supporting equivalent reliability and environmental standards.
• Packaging Considerations: Both components are surface mount devices; however, physical package geometry differs (4-SMD Gull Wing versus Chip with Concave Terminals), requiring PCB layout verification during design transition.

Frequently Asked Questions (FAQ)

Q: Can the CD-MBL104S directly replace the CDNBS04-B08400 without circuit modifications?

A: The CD-MBL104S meets all electrical performance requirements and can function as a drop-in substitute from an electrical standpoint. However, physical package geometry differs between the two parts. PCB footprint and layout must be verified and updated to accommodate the Chip with Concave Terminals package of the substitute before implementation.

Q: What is the significance of the current rating difference (800 mA vs. 1 A)?

A: The CD-MBL104S has a higher average rectified current rating (1 A) than the original part (800 mA). This provides additional current capacity margin and does not create compatibility issues. The substitute can safely handle applications designed for the lower current rating.

Q: Are there compliance or certification differences between these parts?

A: Both parts are RoHS3 compliant with identical MSL ratings (1 - Unlimited). The CD-MBL104S is REACH Affected, while the original part is REACH Unaffected. Compliance requirements should be verified against specific application and regional regulations.

Q: Why is the operating temperature range different?

A: The CD-MBL104S supports an extended upper operating temperature limit (175°C vs. 150°C). This represents an improvement over the original specification and does not restrict substitution. Applications operating within the original temperature range will function within the substitute's specifications.

Q: What packaging considerations apply to this substitution?

A: The original CDNBS04-B08400 uses a 4-SMD Gull Wing package, while the CD-MBL104S uses a Chip package with Concave Terminals. These are physically distinct packages requiring different PCB footprints. Design files and assembly documentation must be updated to reflect the new package geometry before production implementation.