UD3KB40-BP Bridge Rectifier Single Phase 400V 3A Equivalent & Substitute Parts

Part Overview

The UD3KB40-BP is a single-phase bridge rectifier manufactured by Micro Commercial Co, rated for 400V peak reverse voltage with 3A average rectified current. This component is classified as not for new designs, indicating it has been superseded in the manufacturer's product line. Finding equivalent and substitute parts is necessary for maintenance applications, legacy system repairs, and continued support of existing installations where this rectifier is specified.

Substiute Parts

UD3KB40-BP

Micro Commercial CoIn Stock: 956UD3KB40-BP Datasheet

Current PartRFQ

KBP304G

SMC Diode SolutionsIn Stock: 689KBP304G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UD3KB40-BP is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Diode Type: Single Phase (identical topology)
• Voltage - Peak Reverse (Max): 400 V (minimum threshold for voltage rating)
• Current - Average Rectified (Io): 3 A (current handling capacity)
• Technology: Standard (rectifier classification)
• Operating Temperature Range: -55°C to 150°C (thermal compatibility)

Mechanical Equivalence Requirements:

• Mounting Type: Through Hole (PCB assembly method)
• Package / Case: 4-SIP or equivalent 4-pin single inline package (physical footprint compatibility)

The KBP304G from SMC Diode Solutions meets all electrical and mechanical equivalence criteria. Both components share identical voltage ratings, current ratings, temperature ranges, and through-hole mounting configuration. Packaging differences (4-SIP versus 4-ESIP) represent minor physical variations within the same functional package class and do not prevent direct substitution in through-hole applications.

Parameter Comparison

Engineering Selection Recommendations

UD3KB40-BP Selection Basis: The UD3KB40-BP is classified as "Not For New Designs" by Micro Commercial Co. This status indicates the part is in end-of-life phase and should not be selected for new product development. However, existing installations and legacy systems may require continued supply of this specific part number for maintenance and repair purposes.

KBP304G Selection Basis: The KBP304G is classified as "Active" by SMC Diode Solutions and carries RoHS3 compliance certification. This part is actively manufactured and supported. The KBP304G meets all electrical and mechanical equivalence criteria for the UD3KB40-BP and is suitable for direct substitution in through-hole bridge rectifier applications requiring 400V, 3A single-phase rectification.

Compliance Considerations: The UD3KB40-BP carries REACH Unaffected status. The KBP304G carries REACH Affected status with RoHS3 Compliant certification. Both parts share identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications. Selection between these parts should account for regulatory requirements specific to the end application and geographic market.

Frequently Asked Questions (FAQ)

Q: Can KBP304G be used as a direct replacement for UD3KB40-BP in existing circuit boards?

A: Yes. Both components are single-phase bridge rectifiers with identical 400V peak reverse voltage and 3A average rectified current ratings. Both use through-hole mounting. The 4-SIP and 4-ESIP package variants are mechanically compatible for through-hole PCB assembly. Pin configuration and electrical function are identical.

Q: What is the difference between 4-SIP and 4-ESIP packaging?

A: Both designations refer to 4-pin single inline packages suitable for through-hole mounting. The "E" designation in 4-ESIP indicates a specific physical variant. Both packages accommodate the same electrical function and pin spacing for bridge rectifier applications. Verify PCB footprint compatibility with your specific board design.

Q: Are there any electrical performance differences between UD3KB40-BP and KBP304G?

A: Both parts meet the same voltage and current ratings. The KBP304G exhibits lower reverse leakage current (5 µA versus 10 µA at 400V) and slightly higher forward voltage drop (1.1V at 3A versus 1.0V at 1.5A). These differences are within normal manufacturing tolerances for standard bridge rectifier technology and do not affect functional equivalence in typical applications.

Q: Why is UD3KB40-BP marked "Not For New Designs"?

A: This status indicates the part has been discontinued by Micro Commercial Co and is no longer recommended for new product development. Existing inventory may remain available for legacy system support. For new designs, KBP304G or other active bridge rectifier products should be selected.

Q: What compliance certifications should I verify before substitution?

A: Verify that the substitute part meets the regulatory requirements for your specific application and market. The KBP304G carries RoHS3 compliance, while the UD3KB40-BP does not. Both parts share identical ECCN and HTSUS classifications. Confirm REACH compliance requirements with your procurement and compliance teams.

Q: Is inventory availability a factor in part selection?

A: Yes. The UD3KB40-BP has 943 pieces in stock, while KBP304G has 605 pieces in stock. For immediate requirements, verify current inventory status with your supplier. Long-term availability favors KBP304G due to its active product status.