KBU2502-G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBU2502-G is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 200 V peak reverse voltage and 3.6 A average rectified current. This component is classified as obsolete, necessitating identification of active alternative parts that maintain electrical and mechanical compatibility for through-hole applications. Substitute parts must satisfy the same voltage and current specifications while accommodating modern supply chain requirements.

Key Parameters

Parameter	KBU2502-G
Voltage - Peak Reverse (Max)	200 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 @ 200 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBU
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria applied strictly to the provided parameters:

Primary Substitution Criteria:

Voltage - Peak Reverse (Max): Must equal or exceed 200 V
Current - Average Rectified (Io): Must equal or exceed 3.6 A
Mounting Type: Must be Through Hole
Operating Temperature Range: Must encompass -55°C to 150°C
Diode Type: Must be Single Phase
Technology: Must be Standard

Secondary Compatibility Factors:

Package / Case: GBU or KBU form factors are mechanically compatible with 4-SIP through-hole footprints
RoHS Status: ROHS3 Compliant preferred for regulatory alignment
Moisture Sensitivity Level: MSL 1 (Unlimited) ensures handling compatibility

Parts meeting all primary criteria are classified as direct substitutes. Parts exceeding current or voltage ratings remain functionally compatible for the KBU2502-G application.

Parameter Comparison

Part Number	Manufacturer	Voltage (V)	Current (A)	Vf (Max) @ If	Ir @ Vr	Temp Range (°C)	Package	Status
KBU2502-G	Comchip Technology	200	3.6	1.1 V @ 12.5 A	10 µA @ 200 V	-55 ~ 150	4-SIP, KBU	Obsolete
GBU2502-HF	Comchip Technology	200	25	1 V @ 12.5 A	5 µA @ 200 V	-55 ~ 150	4-SIP, GBU	Active
GBU1002	SMC Diode Solutions	200	10	1.1 V @ 10 A	5 µA @ 200 V	-55 ~ 150	4-ESIP, GBU	Active
GBU402	Taiwan Semiconductor Corporation	100	4	1.1 V @ 4 A	5 µA @ 100 V	-55 ~ 150	4-ESIP, GBU	Active
GBU4D	onsemi	200	4	1 V @ 4 A	5 µA @ 200 V	-55 ~ 150	4-SIP, GBU	Last Time Buy
GBU602	SMC Diode Solutions	200	6	1.1 V @ 6 A	5 µA @ 200 V	-55 ~ 150	4-ESIP, GBU	Active
GBU6D	Diotec Semiconductor	200	4.2	1 V @ 6 A	5 µA @ 200 V	-50 ~ 150	4-SIP, GBU	Active
GBU6D-BP	Micro Commercial Co	200	6	1 V @ 3 A	5 µA @ 200 V	-55 ~ 150	4-SIP, GBU	Not For New Designs
GBU802	Taiwan Semiconductor Corporation	100	8	1.1 V @ 8 A	5 µA @ 100 V	-55 ~ 150	4-ESIP, GBU	Active
GBU8D	Diotec Semiconductor	200	5.6	1 V @ 8 A	5 µA @ 200 V	-50 ~ 150	4-SIP, GBU	Active
GBU8D-BP	Micro Commercial Co	200	8	1 V @ 4 A	5 µA @ 200 V	-55 ~ 150	4-SIP, GBU	Not For New Designs

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status, Full Compliance):

GBU2502-HF (Comchip Technology) meets all primary substitution criteria with 200 V rating, 25 A current capacity, and active product status. This part provides the highest current margin and maintains the same manufacturer lineage as the original KBU2502-G.

GBU1002 (SMC Diode Solutions) satisfies all electrical requirements with 200 V and 10 A rating. Active status and ROHS3 compliance support long-term supply chain stability.

GBU602 (SMC Diode Solutions) provides 200 V and 6 A capability, exceeding the 3.6 A requirement with active status and full compliance certifications.

Secondary Substitutes (Active Status, Voltage Consideration):

GBU402 and GBU802 (Taiwan Semiconductor Corporation) are rated for 100 V peak reverse voltage, which is below the 200 V specification of KBU2502-G. These parts are suitable only for applications where the actual operating voltage does not exceed 100 V.

Not Recommended for New Designs:

GBU6D-BP and GBU8D-BP (Micro Commercial Co) carry "Not For New Designs" status, limiting their suitability for ongoing production or new applications.

GBU4D (onsemi) is classified as Last Time Buy, indicating discontinued production.

GBU6D (Diotec Semiconductor) operates at -50°C minimum temperature, which does not fully encompass the -55°C lower limit of the original specification.

Frequently Asked Questions (FAQ)

Q: Can GBU402 or GBU802 replace KBU2502-G directly?

A: GBU402 and GBU802 are rated for 100 V peak reverse voltage, compared to the 200 V specification of KBU2502-G. These parts are compatible only if the actual circuit operating voltage does not exceed 100 V. Verify circuit voltage requirements before selection.

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

A: Both KBU and GBU are 4-SIP through-hole form factors used for single-phase bridge rectifiers. The designations reflect manufacturer conventions. Both are mechanically compatible with standard through-hole PCB footprints rated for 4-SIP packages.

Q: Why does GBU2502-HF have a higher current rating (25 A) than KBU2502-G (3.6 A)?

A: GBU2502-HF is a higher-capacity variant of the same voltage class. The increased current rating does not affect compatibility; the part will function correctly in applications requiring 3.6 A or less. Higher current capacity provides design margin and may improve thermal performance.

Q: Is GBU6D suitable as a substitute if the operating temperature minimum is -50°C instead of -55°C?

A: GBU6D specifies -50°C to 150°C operating range, which does not fully cover the -55°C lower limit of KBU2502-G. Selection depends on whether the application requires operation at -55°C. If the actual minimum operating temperature is -50°C or higher, GBU6D is compatible.

Q: What does "Not For New Designs" status mean for GBU6D-BP and GBU8D-BP?

A: "Not For New Designs" indicates that these parts are in end-of-life phase and manufacturers recommend against using them in new product development. Existing inventory may be available, but long-term supply is not guaranteed. For new designs, select parts with Active status.

Q: Are there electrical performance differences between substitute parts?

A: Forward voltage (Vf) and reverse leakage current (Ir) vary slightly among substitutes. All listed parts maintain the same operating temperature range and voltage class as KBU2502-G. Current ratings exceed the 3.6 A requirement, ensuring adequate capacity for the original application.

Q: Can I use a substitute part with a higher current rating in a cost-sensitive application?

A: Yes. Parts with higher current ratings (such as GBU2502-HF at 25 A) are electrically compatible with applications requiring lower current (3.6 A). However, verify that the higher current rating does not introduce cost or thermal management concerns for your specific application.

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