KBU6M Bridge Rectifier Single Phase 1 kV 6A Equivalent & Substitute Parts

Part Overview

The KBU6M is a single-phase bridge rectifier manufactured by onsemi, rated for 1 kV 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 KBU6M operates across a temperature range of -55°C to 150°C and is housed in a 4-SIP through-hole package configuration. Identifying compatible alternatives ensures design continuity and supply chain flexibility.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	1 kV
Current - Average Rectified (Io)	6 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 6 A
Current - Reverse Leakage @ Vr	5 µA @ 1000 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP

Substitute Part Grouping Explanation

Substitute parts for the KBU6M are classified based on strict electrical and mechanical parameter alignment:

Direct Substitutes maintain identical or equivalent electrical specifications:

Peak reverse voltage: 1 kV (required)
Average rectified current: 6 A (required)
Operating temperature range: -55°C to 150°C or better (required)
Mounting type: Through hole (required)
Package type: 4-SIP configuration (required)

Similar Substitutes share the same voltage rating and package type but differ in current capacity or other secondary parameters. These are suitable only when circuit design permits the specified current rating.

Parametric Equivalents are identical to the main part and serve as direct replacements.

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
KBU6M	onsemi	1 kV	6 A	1 V @ 6 A	5 µA @ 1000 V	-55°C ~ 150°C	4-SIP, KBU	Obsolete
GBU6M	Diotec Semiconductor	1 kV	4.2 A	1 V @ 6 A	5 µA @ 1000 V	-50°C ~ 150°C	4-SIP, GBU	Active
GBU610-G	Comchip Technology	1 kV	6 A	1 V @ 3 A	10 µA @ 800 V	-55°C ~ 150°C	4-SIP, GBU	Active
GBU810-G	Comchip Technology	1 kV	8 A	1 V @ 4 A	10 µA @ 1000 V	-55°C ~ 150°C	4-SIP, GBU	Active
GBU410-G	Comchip Technology	1 kV	4 A	1 V @ 2 A	10 µA @ 1000 V	-55°C ~ 150°C	4-SIP, GBU	Active
GBU2510-G	Comchip Technology	1 kV	25 A	1 V @ 12.5 A	10 µA @ 1000 V	-55°C ~ 150°C	4-SIP, GBU	Active

Engineering Selection Recommendations

GBU610-G (Comchip Technology) is the closest functional equivalent to KBU6M. It maintains the 1 kV voltage rating, 6 A current capacity, -55°C to 150°C operating range, and 4-SIP through-hole package. This part is active in production and carries ROHS3 compliance and REACH unaffected status, providing regulatory continuity.

GBU6M (Diotec Semiconductor) is an active alternative with identical voltage and forward voltage specifications. The rated current is 4.2 A, which is lower than the KBU6M's 6 A specification. This part is suitable only for applications where the circuit design permits reduced current capacity. Operating temperature range is -50°C to 150°C, which covers most industrial applications but does not extend to the full -55°C lower limit.

GBU810-G (Comchip Technology) provides higher current capacity (8 A) while maintaining the 1 kV voltage rating and full -55°C to 150°C operating range. This part is suitable for designs requiring current margin above 6 A specifications.

GBU410-G (Comchip Technology) and GBU2510-G (Comchip Technology) share the same voltage rating and package but differ significantly in current capacity (4 A and 25 A respectively). These are suitable only when circuit requirements align with their specific current ratings.

All recommended active substitutes carry ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with modern design standards.

Frequently Asked Questions (FAQ)

Q: Can GBU6M replace KBU6M directly? GBU6M shares the same voltage rating (1 kV) and package type (4-SIP through-hole). However, the rated current is 4.2 A versus KBU6M's 6 A. Direct replacement is possible only if circuit design permits operation at the lower current rating. The operating temperature range (-50°C to 150°C) is narrower than KBU6M (-55°C to 150°C).

Q: What is the difference between GBU610-G and GBU6M? Both parts maintain 1 kV voltage rating and 6 A current capacity. GBU610-G is manufactured by Comchip Technology and carries ROHS3 compliance. GBU6M is manufactured by Diotec Semiconductor with a lower rated current of 4.2 A. GBU610-G provides better parameter alignment with KBU6M specifications.

Q: Can I use GBU810-G as a substitute for KBU6M? Yes. GBU810-G maintains the 1 kV voltage rating, -55°C to 150°C operating range, and 4-SIP through-hole package. The 8 A current rating exceeds KBU6M's 6 A specification, providing additional current capacity margin. This part is suitable for applications where higher current handling is beneficial or required.

Q: Are there package compatibility concerns between KBU and GBU series? Both KBU6M and GBU series parts use 4-SIP through-hole package configuration. Physical footprint and pin spacing are compatible for PCB mounting. Electrical pin assignments follow standard bridge rectifier conventions, ensuring functional compatibility.

Q: What compliance certifications should I verify for substitutes? All active substitute parts listed carry ROHS3 compliance and REACH unaffected status. These certifications align with current regulatory requirements for electronic components in industrial and consumer applications. Verify specific compliance requirements for your application region before final selection.

Q: Why is KBU6M classified as obsolete? KBU6M is no longer in active production by onsemi. Active alternatives from manufacturers such as Comchip Technology and Diotec Semiconductor provide equivalent or superior specifications with ongoing supply availability and regulatory compliance.

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