KBU25005-G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBU25005-G is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 50 V peak reverse voltage and 3.6 A average rectified current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The KBU25005-G operates across a temperature range of -55°C to 150°C and is housed in a 4-SIP KBU package with through-hole mounting. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) ensure compatibility with modern manufacturing standards.

Key Parameters

Parameter	Value
Manufacturer Part Number	KBU25005-G
Manufacturer	Comchip Technology
Diode Type	Single Phase
Voltage - Peak Reverse (Max)	50 V
Current - Average Rectified (Io)	3.6 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 12.5 A
Current - Reverse Leakage @ Vr	10 µA @ 50 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBU
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the KBU25005-G is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Peak Reverse (Max): 50 V (exact match required)
Diode Type: Single Phase (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -55°C ~ 150°C (minimum requirement)
Current - Average Rectified (Io): Equal to or greater than 3.6 A
RoHS Status: ROHS3 Compliant (compliance requirement)

Package Compatibility: Substitute parts must use either 4-SIP KBU or 4-SIP/4-ESIP GBU package configurations, as these maintain mechanical and electrical compatibility with through-hole PCB mounting.

Reverse Leakage Consideration: The original part specifies 10 µA @ 50 V reverse leakage. Substitute parts with 5 µA @ 50 V leakage represent improved performance characteristics and are acceptable.

Substitute parts are grouped into two categories: manufacturer-recommended active alternatives and legacy parts retained for existing system support.

Parameter Comparison

Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	Product Status	RoHS Status
KBU25005-G	Comchip Technology	50 V	3.6 A	1.1 V @ 12.5 A	10 µA @ 50 V	-55°C ~ 150°C	4-SIP, KBU	Obsolete	ROHS3 Compliant
GBU25005-HF	Comchip Technology	50 V	25 A	1 V @ 12.5 A	5 µA @ 50 V	-55°C ~ 150°C	4-SIP, GBU	Active	ROHS3 Compliant
GBU10005	SMC Diode Solutions	50 V	10 A	1.1 V @ 10 A	5 µA @ 50 V	-55°C ~ 150°C	4-ESIP	Active	ROHS3 Compliant
GBU4005	SMC Diode Solutions	50 V	4 A	1.1 V @ 4 A	5 µA @ 50 V	-55°C ~ 150°C	4-ESIP	Active	ROHS3 Compliant
GBU4A	Good-Ark Semiconductor	50 V	3 A	1 V @ 2 A	5 µA @ 50 V	-55°C ~ 150°C	4-SIP, GBU	Active	ROHS3 Compliant
GBU4A-BP	Micro Commercial Co	50 V	4 A	1 V @ 2 A	5 µA @ 50 V	-55°C ~ 150°C	4-SIP, GBU	Not For New Designs	ROHS3 Compliant
GBU6005	SMC Diode Solutions	50 V	6 A	1.1 V @ 6 A	5 µA @ 50 V	-55°C ~ 150°C	4-ESIP	Active	ROHS3 Compliant
GBU6A-BP	Micro Commercial Co	50 V	6 A	1 V @ 3 A	5 µA @ 50 V	-55°C ~ 150°C	4-SIP, GBU	Not For New Designs	ROHS3 Compliant
GBU8005	SMC Diode Solutions	50 V	8 A	1.1 V @ 8 A	5 µA @ 50 V	-55°C ~ 150°C	4-ESIP	Active	ROHS3 Compliant
GBU8A	Fairchild Semiconductor	50 V	5.6 A	1 V @ 8 A	5 µA @ 50 V	-50°C ~ 150°C	4-ESIP, GBU	Active	Not specified
GBU8A-BP	Micro Commercial Co	50 V	8 A	1 V @ 4 A	5 µA @ 50 V	-55°C ~ 150°C	4-SIP, GBU	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

For New Designs: GBU25005-HF (Comchip Technology) is the primary recommended substitute. It maintains the same manufacturer lineage, operates at identical voltage and temperature specifications, and carries Active product status with ROHS3 compliance. The increased current rating (25 A vs. 3.6 A) provides design margin without electrical incompatibility.

GBU10005 (SMC Diode Solutions), GBU6005 (SMC Diode Solutions), GBU4005 (SMC Diode Solutions), and GBU8005 (SMC Diode Solutions) are all Active products with ROHS3 compliance and meet the 50 V voltage requirement. Selection among these depends on actual circuit current requirements. GBU4005 (4 A) provides the closest current match to the original 3.6 A specification.

GBU8A (Fairchild Semiconductor) is Active but lacks specified RoHS status documentation. Use only when RoHS compliance is not a system requirement.

For Existing System Support: GBU4A (Good-Ark Semiconductor) and GBU8A-BP (Micro Commercial Co) are Active alternatives. GBU4A-BP and GBU6A-BP carry "Not For New Designs" status and are suitable only for legacy system maintenance and repair applications.

Frequently Asked Questions (FAQ)

Q: Can GBU25005-HF directly replace KBU25005-G in existing designs? A: Yes. Both parts maintain 50 V peak reverse voltage, single-phase operation, through-hole mounting, and -55°C to 150°C operating range. The GBU25005-HF package designation changes from KBU to GBU, but both are 4-SIP configurations compatible with standard through-hole PCB layouts.

Q: What is the difference between GBU and KBU package designations? A: Both GBU and KBU are 4-SIP through-hole bridge rectifier packages types. The designation reflects manufacturer conventions. Mechanical and electrical compatibility is maintained across these package families for the specified voltage and current ratings.

Q: Why do some substitutes have higher current ratings than the original part? A: Higher current ratings indicate improved thermal performance and design margin. A 25 A rated part (GBU25005-HF) operating at 3.6 A experiences lower junction temperature and stress than the original 3.6 A rated part. This represents a performance upgrade, not a compatibility issue.

Q: Are parts marked "Not For New Designs" suitable for replacement? A: Parts with "Not For New Designs" status (GBU4A-BP, GBU6A-BP, GBU8A-BP) are acceptable for field replacement and system maintenance of existing equipment. They are not recommended for new product development or long-term production designs.

Q: What is the significance of the reverse leakage current difference? A: The original KBU25005-G specifies 10 µA @ 50 V reverse leakage. Substitute parts with 5 µA @ 50 V represent improved leakage characteristics. Lower reverse leakage reduces standby current consumption and improves circuit efficiency. This is a beneficial parameter change.

Q: Does operating temperature range affect substitution? A: GBU8A specifies -50°C to 150°C, which is narrower than the original -55°C to 150°C. Use GBU8A only if your application does not require operation below -50°C. All other substitutes maintain the full -55°C to 150°C range.

Q: Is RoHS compliance mandatory for substitution? A: RoHS compliance is a regulatory and manufacturing requirement in most markets. GBU8A lacks specified RoHS status. For applications requiring RoHS3 compliance documentation, select from parts explicitly marked ROHS3 Compliant.

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