Equivalent & Substitute Parts for KBU6A Bridge Rectifier

Part Overview

The KBU6A is a single-phase bridge rectifier diode manufactured by onsemi, rated for 50 V peak reverse voltage and 6 A average rectified current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The KBU6A operates across a temperature range of -55°C to 150°C and is housed in a 4-SIP KBU package for through-hole mounting applications.

Substiute Parts

KBU6A

onsemiIn Stock: 1516KBU6A Datasheet

Current PartRFQ

GBU25005-G

Comchip TechnologyIn Stock: 1034GBU25005-G Datasheet

SimilarRFQ

GBU4005-G

Comchip TechnologyIn Stock: 939GBU4005-G Datasheet

SimilarRFQ

GBU6005-G

Comchip TechnologyIn Stock: 1145GBU6005-G Datasheet

SimilarRFQ

GBU8005-G

Comchip TechnologyIn Stock: 1002GBU8005-G Datasheet

SimilarRFQ

KBL4005-G

Comchip TechnologyIn Stock: 1059KBL4005-G Datasheet

SimilarRFQ

KBU35005-G

Comchip TechnologyIn Stock: 1160KBU35005-G Datasheet

SimilarRFQ

KBU6A

Fairchild SemiconductorIn Stock: 1428KBU6A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the KBU6A is determined by strict alignment of the following electrical and mechanical parameters:

• Voltage - Peak Reverse (Max): 50 V (exact match required)
• Current - Average Rectified (Io): 6 A (exact match or higher rating acceptable)
• Diode Type: Single Phase (exact match required)
• Technology: Standard (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C ~ 150°C (exact match required)
• Package / Case: 4-SIP form factor (KBU or equivalent package family)

Substitute parts are grouped into two categories:

Direct Substitutes (Same Package Family - KBU): Parts maintaining the KBU package designation with identical electrical ratings.

Cross-Family Substitutes (GBU Package Family): Parts with identical electrical specifications but housed in the GBU package family, which maintains the same 4-SIP through-hole form factor and pin configuration.

Current-Rated Variants: Parts with higher current ratings (8 A, 25 A, 35 A) that meet or exceed the 6 A requirement while maintaining all other parameters.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: GBU6005-G (Comchip Technology) provides an exact electrical match at 6 A with active product status and ROHS3 compliance. The GBU package maintains identical 4-SIP through-hole form factor and pin compatibility with the original KBU6A.

Higher Current Alternative: GBU8005-G (Comchip Technology) offers 8 A current rating, exceeding the 6 A requirement while maintaining all other electrical parameters. This part is active and ROHS3 compliant, suitable for applications requiring additional current margin.

Parametric Equivalent: KBU6A from Fairchild Semiconductor provides identical electrical specifications and package configuration. This part is obsolete but represents a direct parametric equivalent from an alternative manufacturer source.

Current-Derated Option: GBU4005-G (Comchip Technology) is suitable only for applications where the 6 A requirement can be reduced to 4 A. This part is active and ROHS3 compliant.

High Current Variant: GBU25005-G (Comchip Technology) and KBU35005-G (Comchip Technology) are available for applications requiring significantly higher current capacity while maintaining the 50 V voltage rating and through-hole mounting configuration.

Frequently Asked Questions (FAQ)

Q: Can GBU6005-G directly replace KBU6A in existing designs?

A: Yes. GBU6005-G maintains identical electrical specifications (50 V, 6 A, -55°C to 150°C) and 4-SIP through-hole package form factor. Pin configuration and mechanical dimensions are compatible. The primary difference is the package family designation (GBU versus KBU), which does not affect electrical performance or board-level compatibility.

Q: What is the difference between KBU and GBU package families?

A: Both KBU and GBU are 4-SIP through-hole bridge rectifier packages with identical pin configurations and mechanical dimensions. The designation reflects manufacturer product line classification. Electrical performance and physical compatibility are equivalent.

Q: Can I use GBU8005-G instead of KBU6A?

A: Yes. GBU8005-G exceeds the 6 A current requirement with an 8 A rating while maintaining all other electrical parameters. This substitution is suitable for applications where additional current capacity provides design margin. Thermal management and PCB layout considerations remain unchanged.

Q: Why is KBU6A listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by onsemi. Active substitutes from Comchip Technology (GBU6005-G, GBU8005-G) provide equivalent functionality and are currently in production.

Q: Are there RoHS compliance differences between KBU6A and substitute parts?

A: The original onsemi KBU6A is REACH Unaffected. Comchip Technology substitutes (GBU6005-G, GBU8005-G, GBU4005-G, GBU25005-G, KBL4005-G, KBU35005-G) are ROHS3 Compliant. Both compliance statuses are acceptable for most applications; verify specific project requirements.

Q: What is the reverse leakage current difference between KBU6A and GBU6005-G?

A: KBU6A specifies 5 µA @ 50 V reverse leakage, while GBU6005-G specifies 10 µA @ 50 V. This difference is within acceptable tolerance for standard bridge rectifier applications and does not affect functional compatibility.

Q: Can I use KBL4005-G as a substitute?

A: KBL4005-G is suitable only if your application can operate at 4 A instead of 6 A. The KBL package maintains the same 4-SIP through-hole form factor. Forward voltage is slightly higher (1.1 V @ 4 A versus 1 V @ 6 A), which may affect thermal performance in high-current applications.