KBU6J Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBU6J is a single-phase bridge rectifier manufactured by onsemi, rated for 600 V peak reverse voltage and 6 A average rectified current. This component is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity. The KBU package configuration (4-SIP through-hole) remains functionally compatible with several active alternatives from other manufacturers that maintain the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Diode Type	Single Phase Bridge Rectifier
Voltage - Peak Reverse (Max)	600 V
Current - Average Rectified (Io)	6 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 6 A
Current - Reverse Leakage @ Vr	5 µA @ 600 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBU
Technology	Standard

Substitute Part Grouping Explanation

Substitution of the KBU6J is determined by the following critical parameters:

Voltage Rating: Peak reverse voltage must equal or exceed 600 V
Current Rating: Average rectified current must support minimum 6 A operation
Package Type: 4-SIP through-hole configuration for mechanical compatibility
Diode Type: Single-phase bridge rectifier topology
Temperature Range: Operating temperature capability must encompass -55°C to 150°C

Substitute parts are grouped into two categories:

Direct Functional Equivalent: GBU6J (Diotec Semiconductor) maintains identical voltage and current ratings with active product status and RoHS3 compliance.

Similar Electrical Equivalents: GBU606-G, GBU2506-G, and GBU406-G (Comchip Technology) provide 600 V voltage rating with varying current capacities (6 A, 4.2 A, and 4 A respectively). These parts share the same package footprint and mounting type, with current ratings at or above the minimum 6 A requirement for GBU606-G, or reduced current capacity for GBU406-G and GBU2506-G applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Peak Reverse (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	RoHS Status
KBU6J	onsemi	Obsolete	600 V	6 A	1 V @ 6 A	5 µA @ 600 V	-55°C ~ 150°C	4-SIP, KBU	Not specified
GBU6J	Diotec Semiconductor	Active	600 V	4.2 A	1 V @ 6 A	5 µA @ 600 V	-50°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant
GBU606-G	Comchip Technology	Active	600 V	6 A	1 V @ 3 A	10 µA @ 600 V	-55°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant
GBU2506-G	Comchip Technology	Active	600 V	4.2 A	1 V @ 12.5 A	10 µA @ 600 V	-55°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant
GBU406-G	Comchip Technology	Active	600 V	4 A	1 V @ 2 A	10 µA @ 600 V	-55°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: GBU606-G (Comchip Technology) is the recommended substitute for KBU6J applications. This part maintains identical voltage (600 V) and current (6 A) ratings, operates across the full temperature range (-55°C to 150°C), and holds active product status with ROHS3 compliance. The 4-SIP GBU package provides direct mechanical compatibility with KBU footprints in through-hole applications.

Secondary Substitute: GBU6J (Diotec Semiconductor) offers active product status and RoHS3 compliance. The reduced average rectified current rating (4.2 A versus 6 A) and narrower lower temperature limit (-50°C versus -55°C) require application-level verification for designs operating at maximum current or minimum temperature extremes.

Current-Reduced Alternatives: GBU2506-G and GBU406-G are suitable only for applications where the circuit design permits operation below the original 6 A specification. GBU2506-G supports 4.2 A and GBU406-G supports 4 A average rectified current. Both maintain 600 V voltage rating and full temperature range compatibility.

All substitute parts listed carry ROHS3 compliance and REACH compliance status, supporting modern procurement and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can GBU6J replace KBU6J directly? A: GBU6J is mechanically compatible (4-SIP through-hole package) and electrically similar. However, the reduced average rectified current (4.2 A versus 6 A) and lower minimum operating temperature (-50°C versus -55°C) require verification against circuit requirements before substitution.

Q: What is the primary difference between KBU and GBU package designations? A: KBU and GBU both refer to 4-SIP through-hole bridge rectifier packages with identical mechanical footprints. The letter designation indicates manufacturer family classification. Electrical performance is determined by the numeric rating (6, 4.2, 4, or 8 A) rather than package letter.

Q: Is GBU606-G a complete equivalent to KBU6J? A: GBU606-G matches the KBU6J in voltage rating (600 V), current rating (6 A), and operating temperature range (-55°C to 150°C). The forward voltage specification differs at different test currents (1 V @ 3 A for GBU606-G versus 1 V @ 6 A for KBU6J), but both meet the 1 V maximum specification at their respective test points. GBU606-G is active and RoHS3 compliant.

Q: Why do some substitutes show lower current ratings? A: GBU2506-G (4.2 A) and GBU406-G (4 A) are listed as similar alternatives for applications where circuit design permits reduced current capacity. These parts maintain the same 600 V voltage rating and package compatibility but are suitable only for lower-current designs.

Q: Are all substitute parts RoHS3 compliant? A: All listed substitute parts (GBU6J, GBU606-G, GBU2506-G, GBU406-G) carry ROHS3 Compliant status. The original KBU6J does not specify RoHS status.

Q: What is the temperature range difference between KBU6J and GBU6J? A: KBU6J operates from -55°C to 150°C, while GBU6J operates from -50°C to 150°C. Applications requiring operation below -50°C must use KBU6J, GBU606-G, GBU2506-G, or GBU406-G.

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