KBU3501-G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBU3501-G is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 100 V peak reverse voltage and 4.2 A average rectified current. This component is classified as obsolete, making substitute parts necessary for ongoing production and maintenance applications. The KBU3501-G features a through-hole 4-SIP KBU package and operates across a temperature range of -55°C to 125°C.

Key Parameters

Parameter	Value
Manufacturer Part Number	KBU3501-G
Manufacturer	Comchip Technology
Diode Type	Single Phase
Voltage - Peak Reverse (Max)	100 V
Current - Average Rectified (Io)	4.2 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 17.5 A
Current - Reverse Leakage @ Vr	10 µA @ 100 V
Operating Temperature	-55°C ~ 125°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBU
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the KBU3501-G is determined by the following critical parameters:

Voltage - Peak Reverse (Max): Must equal or exceed 100 V
Current - Average Rectified (Io): Must equal or exceed 4.2 A
Diode Type: Single Phase
Mounting Type: Through Hole
Operating Temperature Range: Must accommodate the application's thermal requirements
Package Compatibility: GBU or equivalent through-hole packages
RoHS Compliance: ROHS3 Compliant status preferred for regulatory alignment

Substitute parts are grouped into two categories based on voltage and current ratings:

Category A - 100 V Rated Parts (Voltage Match): GBU1001, GBU4B, GBU4B-BP, GBU601, GBU6B, GBU6B-BP, GBU8B, RS402GL-BP. These parts maintain the 100 V peak reverse voltage specification.

Category B - 50 V Rated Parts (Reduced Voltage): GBU401, GBU801. These parts operate at 50 V peak reverse voltage and are suitable only for applications where the circuit voltage does not exceed 50 V.

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
KBU3501-G	Comchip Technology	100 V	4.2 A	1.1 V @ 17.5 A	10 µA @ 100 V	-55°C ~ 125°C	4-SIP, KBU	Obsolete	ROHS3 Compliant
GBU1001	SMC Diode Solutions	100 V	10 A	1.1 V @ 10 A	5 µA @ 100 V	-55°C ~ 150°C	4-ESIP	Active	ROHS3 Compliant
GBU401	Taiwan Semiconductor Corporation	50 V	4 A	1.1 V @ 4 A	5 µA @ 50 V	-55°C ~ 150°C	4-ESIP, GBU	Active	ROHS3 Compliant
GBU4B	Diotec Semiconductor	100 V	2.8 A	1 V @ 4 A	5 µA @ 100 V	-50°C ~ 150°C	4-SIP, GBU	Active	ROHS3 Compliant
GBU4B-BP	Micro Commercial Co	100 V	4 A	1 V @ 2 A	5 µA @ 100 V	-55°C ~ 150°C	4-SIP, GBU	Not For New Designs	ROHS3 Compliant
GBU601	SMC Diode Solutions	100 V	6 A	1.1 V @ 6 A	5 µA @ 100 V	-55°C ~ 150°C	4-ESIP	Active	ROHS3 Compliant
GBU6B	onsemi	100 V	6 A	1 V @ 6 A	5 µA @ 100 V	-55°C ~ 150°C	4-SIP, GBU	Not For New Designs	ROHS3 Compliant
GBU6B-BP	Micro Commercial Co	100 V	6 A	1 V @ 3 A	5 µA @ 100 V	-55°C ~ 150°C	4-SIP, GBU	Not For New Designs	ROHS3 Compliant
GBU801	Taiwan Semiconductor Corporation	50 V	8 A	1.1 V @ 8 A	5 µA @ 50 V	-55°C ~ 150°C	4-ESIP, GBU	Active	ROHS3 Compliant
GBU8B	onsemi	100 V	8 A	1 V @ 8 A	5 µA @ 100 V	-55°C ~ 150°C	4-SIP, GBU	Not For New Designs	ROHS3 Compliant
RS402GL-BP	Micro Commercial Co	100 V	4 A	1.1 V @ 4 A	5 µA @ 50 V	-55°C ~ 150°C	4-SIP, RS-4L	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Product Status)

GBU1001 (SMC Diode Solutions) and GBU601 (SMC Diode Solutions) are the preferred substitutes. Both maintain 100 V peak reverse voltage, exceed the 4.2 A current requirement, and carry Active product status. GBU1001 provides 10 A capacity with extended temperature range to 150°C. GBU601 provides 6 A capacity. Both are ROHS3 compliant and widely available.

Secondary Substitutes (Not For New Designs Status)

GBU6B (onsemi), GBU6B-BP (Micro Commercial Co), and GBU8B (onsemi) maintain 100 V voltage and exceed current requirements but carry Not For New Designs status. These are suitable for legacy system maintenance and repair where component continuity is required.

Reduced Voltage Alternatives (50 V Rated)

GBU401 (Taiwan Semiconductor Corporation) and GBU801 (Taiwan Semiconductor Corporation) operate at 50 V peak reverse voltage. These parts are suitable only for applications where the circuit operates at 50 V or below. Both carry Active product status and ROHS3 compliance.

Package Consideration

The original KBU3501-G uses a 4-SIP KBU package. Substitutes employ either 4-SIP or 4-ESIP packages. Both package types are through-hole mounted and mechanically compatible with standard PCB layouts designed for KBU bridge rectifiers.

Temperature Range Consideration

The KBU3501-G operates to 125°C maximum junction temperature. Most substitute parts extend to 150°C, providing thermal margin. GBU4B operates to 150°C minimum, matching the original specification floor of -50°C.

Frequently Asked Questions (FAQ)

Q: Can GBU401 or GBU801 replace KBU3501-G directly?

A: GBU401 and GBU801 are suitable only if the application circuit operates at 50 V or below. The KBU3501-G is rated for 100 V peak reverse voltage. If the circuit requires 100 V capability, these 50 V parts are not appropriate substitutes.

Q: What is the difference between 4-SIP and 4-ESIP packages?

A: Both are through-hole mounted four-terminal bridge rectifier packages. 4-SIP (Single In-line Package) and 4-ESIP (Enhanced Single In-line Package) are mechanically compatible with standard KBU bridge rectifier PCB footprints. Pin spacing and lead configuration are equivalent for circuit board mounting.

Q: Why do some substitutes have higher current ratings than the original part?

A: Higher current-rated parts (GBU1001 at 10 A, GBU601 at 6 A, GBU8B at 8 A) provide design margin and thermal headroom. A 4.2 A application can safely use a 6 A or 10 A rated bridge rectifier. The higher rating does not affect circuit operation at lower currents.

Q: Is GBU4B-BP a suitable substitute despite lower current rating?

A: GBU4B-BP is rated for 4 A average rectified current, which is below the KBU3501-G specification of 4.2 A. This part does not meet the minimum current requirement and is not a suitable substitute for this application.

Q: What does "Not For New Designs" product status mean?

A: Parts marked "Not For New Designs" are available for existing product support and maintenance but are not recommended for new circuit designs. These parts remain functional and compliant but may have limited future availability. For new designs, select parts with Active status such as GBU1001 or GBU601.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 Compliant status, matching the original KBU3501-G compliance level. This ensures regulatory alignment for applications requiring RoHS certification.

Q: Can I use RS402GL-BP as a substitute?

A: RS402GL-BP maintains 100 V voltage and 4 A current rating but uses an RS-4L package instead of the standard KBU package. While electrically compatible, the different package designation may require PCB layout verification. This part carries Not For New Designs status.

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