KBU4D Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBU4D is a single-phase bridge rectifier manufactured by onsemi, rated for 200 V peak reverse voltage and 4 A average rectified current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The KBU4D operates across a temperature range of -55°C to 150°C and is housed in a 4-SIP through-hole package configuration.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	200 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 4 A
Current - Reverse Leakage @ Vr	5 µA @ 50 V
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBU

Substitute Part Grouping Explanation

Substitution eligibility for the KBU4D is determined by the following critical parameters:

Voltage - Peak Reverse (Max): 200 V minimum
Current - Average Rectified (Io): 4 A minimum
Diode Type: Single Phase
Mounting Type: Through Hole
Operating Temperature Range: -55°C to 150°C minimum

Parts are grouped into three categories based on substitution relationship:

Direct Manufacturer Equivalent (GBU4D): Identical electrical specifications with different package designation (GBU vs. KBU). Meets all parameter requirements with equivalent forward voltage and reverse leakage characteristics.

Similar Manufacturer Parts (GBU2502-G, GBU402-G, GBU602-G, GBU802-G): Meet or exceed the minimum electrical requirements. Current ratings range from 4 A to 8 A, accommodating applications requiring the baseline 4 A specification. All maintain 200 V peak reverse voltage and through-hole mounting.

Parametric Equivalent (KBU4D by Good-Ark Semiconductor): Identical part number and specifications from an alternative manufacturer, providing direct substitution capability.

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
KBU4D	onsemi	200 V	4 A	1 V @ 4 A	5 µA @ 50 V	-55°C ~ 150°C	4-SIP, KBU	Obsolete
GBU4D	onsemi	200 V	4 A	1 V @ 4 A	5 µA @ 200 V	-55°C ~ 150°C	4-SIP, GBU	Last Time Buy
GBU2502-G	Comchip Technology	200 V	4.2 A	1 V @ 12.5 A	10 µA @ 50 V	-55°C ~ 150°C	4-SIP, GBU	Active
GBU402-G	Comchip Technology	200 V	4 A	1 V @ 2 A	10 µA @ 200 V	-55°C ~ 150°C	4-SIP, GBU	Active
GBU602-G	Comchip Technology	200 V	6 A	1 V @ 3 A	5 µA @ 200 V	-55°C ~ 150°C	4-SIP, GBU	Active
GBU802-G	Comchip Technology	200 V	8 A	1 V @ 4 A	10 µA @ 200 V	-55°C ~ 150°C	4-SIP, GBU	Active
KBU4D	Good-Ark Semiconductor	200 V	4 A	1 V @ 4 A	5 µA @ 200 V	-55°C ~ 150°C	4-SIP, KBU	Active

Engineering Selection Recommendations

Primary Selection: KBU4D by Good-Ark Semiconductor provides identical electrical and mechanical specifications with active product status, ensuring long-term availability and supply chain continuity.

Secondary Selection: GBU4D by onsemi offers direct electrical equivalence with the original part. Although classified as Last Time Buy, it remains available in inventory and maintains identical performance characteristics.

Alternative Selections for Higher Current Applications: GBU602-G and GBU802-G are suitable for applications where current headroom is required. Both maintain the 200 V voltage specification and through-hole mounting while providing 6 A and 8 A ratings respectively. These parts carry Active product status and ROHS3 compliance.

Minimum Specification Match: GBU402-G meets the baseline 4 A requirement with Active status and ROHS3 compliance, suitable for direct replacement in current-limited applications.

All substitute parts maintain compliance with REACH regulations and EAR99 export classification consistent with the original KBU4D specification.

Frequently Asked Questions (FAQ)

Q: Can GBU-series parts directly replace KBU-series parts?

A: Yes, when electrical specifications are identical. The package designation (GBU vs. KBU) refers to the physical form factor, but both are 4-SIP through-hole configurations with compatible pinouts for single-phase bridge rectifier applications. Verify PCB footprint compatibility before substitution.

Q: What is the difference between the onsemi GBU4D and the Good-Ark KBU4D?

A: Both parts are electrically and mechanically identical with 200 V, 4 A ratings and -55°C to 150°C operating range. The primary difference is manufacturer and product status. The Good-Ark version is Active, while the onsemi version is Last Time Buy, making Good-Ark the preferred long-term source.

Q: Can I use a higher current-rated part like GBU802-G in place of KBU4D?

A: Yes. Higher current ratings are backward compatible in applications designed for 4 A. The GBU802-G maintains the same 200 V voltage specification and through-hole package, making it suitable for designs requiring additional current margin. No circuit modifications are required.

Q: Are all substitute parts RoHS compliant?

A: The Comchip Technology parts (GBU2502-G, GBU402-G, GBU602-G, GBU802-G) and Good-Ark KBU4D are ROHS3 compliant. The onsemi GBU4D does not specify RoHS status. Verify compliance requirements for your application before selection.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current is measured at different voltages across the substitute parts (50 V vs. 200 V). Lower leakage at higher voltages indicates better performance in high-voltage applications. All values remain within acceptable ranges for standard rectification applications.

Q: Is packaging (Tube vs. Bulk) a factor in substitution?

A: Packaging affects procurement and handling but not electrical or mechanical compatibility. Tube packaging provides organized component presentation, while Bulk packaging is cost-effective for high-volume applications. Select based on your procurement and assembly requirements.

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