KBU804-G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBU804-G is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 400 V peak reverse voltage with 8 A average rectified current. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system maintenance, repair, and redesign applications. Bridge rectifiers in the KBU package series are standard components in AC-to-DC conversion circuits across industrial and consumer electronics applications.

Substiute Parts

KBU804-G

Comchip TechnologyIn Stock: 697KBU804-G Datasheet

Current PartRFQ

KBU8G

onsemiIn Stock: 763KBU8G Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KBU804-G is determined by strict equivalence across the following critical parameters:

• Voltage Rating: Peak reverse voltage must equal 400 V
• Current Rating: Average rectified current must equal 8 A
• Diode Configuration: Single-phase bridge rectifier topology
• Technology Class: Standard rectifier technology
• Mounting Method: Through-hole assembly
• Package Type: 4-SIP KBU form factor
• Thermal Range: Operating temperature range of -55°C to 150°C (TJ)

The KBU8G manufactured by onsemi meets all these parameters and serves as a direct parametric equivalent. Both components share identical electrical specifications, thermal characteristics, and mechanical form factors, enabling direct substitution in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The KBU8G from onsemi is the primary substitute for the obsolete KBU804-G. Both components carry identical electrical and thermal specifications, share the same 4-SIP KBU package footprint, and are classified under the same export control (EAR99) and tariff (HTSUS 8541.10.0080) categories.

Selection of the KBU8G is appropriate for direct replacement in applications where the KBU804-G is no longer available. The onsemi part maintains full compatibility with existing PCB layouts and circuit designs. Both components are classified as obsolete, indicating limited future availability; long-term sourcing strategies should account for this status.

The forward voltage specification difference (1 V @ 4 A for KBU804-G versus 1 V @ 8 A for KBU8G) reflects measurement conditions rather than operational incompatibility, as both maintain the same maximum forward voltage rating of 1 V across their respective current ranges.

Frequently Asked Questions (FAQ)

Q: Can the KBU8G directly replace the KBU804-G in existing designs?

A: Yes. The KBU8G meets all electrical, thermal, and mechanical specifications of the KBU804-G. Both components are rated for 400 V peak reverse voltage, 8 A average rectified current, and operate across the identical temperature range of -55°C to 150°C. The 4-SIP KBU package footprint is identical, enabling direct PCB substitution without layout modifications.

Q: What is the significance of the forward voltage specification difference between these parts?

A: The KBU804-G specifies 1 V @ 4 A while the KBU8G specifies 1 V @ 8 A. Both maintain a maximum forward voltage of 1 V; the difference reflects the test current conditions used during characterization. This does not affect substitution compatibility, as both parts operate within the same voltage envelope across their rated current ranges.

Q: Are there any compliance or regulatory differences between the KBU804-G and KBU8G?

A: No. Both components share identical ECCN classification (EAR99) and HTSUS tariff code (8541.10.0080), indicating equivalent export control and trade classification status.

Q: Why is the KBU804-G classified as obsolete?

A: Obsolete status indicates that the manufacturer has discontinued production and support for this component. The KBU8G, also obsolete, represents the available equivalent from an alternative manufacturer. For applications requiring this rectifier specification, sourcing should prioritize available inventory from authorized distributors.

Q: What package type is used for these bridge rectifiers?

A: Both the KBU804-G and KBU8G use the 4-SIP (Single In-line Package) KBU form factor. This is a through-hole mounting package with four leads, standard for single-phase bridge rectifiers in this voltage and current class.

Q: Can the KBU8G be used in new designs, or is it only for replacement applications?

A: The KBU8G is classified as obsolete, indicating discontinued production. While it may be available from existing inventory, new designs should evaluate current-production alternatives within the KBU bridge rectifier family or consider alternative rectifier topologies with active manufacturer support.