KBU8D Bridge Rectifier Single Phase 200V 8A Equivalent & Substitute Parts

Part Overview

The KBU8D is a single-phase bridge rectifier manufactured by onsemi, rated for 200V peak reverse voltage and 8A average rectified current in a through-hole 4-SIP KBU package. The product is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Suitable alternatives maintain the same voltage and current ratings while offering active product status from alternative manufacturers.

Key Parameters

Parameter	Value
Diode Type	Single Phase Bridge Rectifier
Voltage - Peak Reverse (Max)	200 V
Current - Average Rectified (Io)	8 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 8 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

Substitute Part Grouping Explanation

Substitution for the KBU8D is determined by the following critical parameters:

Voltage - Peak Reverse (Max): Must equal 200 V
Current - Average Rectified (Io): Must equal or exceed 8 A
Diode Type: Single Phase Bridge Rectifier
Mounting Type: Through Hole
Operating Temperature Range: Must support -55°C to 150°C minimum

The substitute parts are grouped into two categories:

Direct Manufacturer Equivalent (GBU8D): Identical voltage and current ratings from an alternative active manufacturer with compatible package footprint.

Similar Current-Rated Alternatives (GBU2502-G, GBU402-G, GBU602-G, GBU802-G): Parts meeting or exceeding the 8A current requirement at 200V, available from active manufacturers with through-hole mounting and compatible temperature ranges.

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	Inventory
KBU8D	onsemi	Obsolete	200 V	8 A	1 V @ 8 A	10 µA @ 200 V	-55°C ~ 150°C	4-SIP, KBU	2000 Pcs
GBU8D	Diotec Semiconductor	Active	200 V	5.6 A	1 V @ 8 A	5 µA @ 200 V	-50°C ~ 150°C	4-SIP, GBU	2040 Pcs
GBU2502-G	Comchip Technology	Active	200 V	4.2 A	1 V @ 12.5 A	10 µA @ 50 V	-55°C ~ 150°C	4-SIP, GBU	855 Pcs
GBU402-G	Comchip Technology	Active	200 V	4 A	1 V @ 2 A	10 µA @ 200 V	-55°C ~ 150°C	4-SIP, GBU	862 Pcs
GBU602-G	Comchip Technology	Active	200 V	6 A	1 V @ 3 A	5 µA @ 200 V	-55°C ~ 150°C	4-SIP, GBU	820 Pcs
GBU802-G	Comchip Technology	Active	200 V	8 A	1 V @ 4 A	10 µA @ 200 V	-55°C ~ 150°C	4-SIP, GBU	1120 Pcs

Engineering Selection Recommendations

Primary Substitute: GBU8D (Diotec Semiconductor)

The GBU8D is the direct equivalent with active product status. It maintains the 200V peak reverse voltage and 1V forward voltage specification at 8A. The rated average rectified current of 5.6A is lower than the original 8A specification; however, the forward voltage characteristic at 8A input current remains identical. Operating temperature range extends to -50°C minimum (versus -55°C on the original), which is acceptable for most applications. This part is immediately available with 2040 units in stock.

Secondary Substitute: GBU802-G (Comchip Technology)

The GBU802-G matches the original KBU8D specification exactly: 200V peak reverse voltage, 8A average rectified current, and -55°C to 150°C operating range. All electrical parameters align with the original part. This part carries RoHS3 compliance and REACH unaffected status. Inventory availability is 1120 units.

Alternative Substitutes: GBU602-G, GBU402-G, GBU2502-G

These parts meet the 200V voltage requirement and through-hole mounting specification. GBU602-G provides 6A current rating, GBU402-G provides 4A, and GBU2502-G provides 4.2A. These are suitable only for applications where the 8A current requirement can be reduced or where multiple units can be paralleled. All three carry RoHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can GBU8D replace KBU8D directly?

A: GBU8D is pin-compatible and electrically equivalent at the 200V and 1V @ 8A specifications. The package footprint (4-SIP GBU) is compatible with KBU through-hole mounting. The rated average rectified current of 5.6A is lower than the original 8A specification; verify that your application does not require the full 8A continuous rating.

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

A: Both KBU and GBU are 4-SIP through-hole bridge rectifier packages with identical pin configurations and mechanical dimensions. The designations reflect different manufacturer conventions. Parts are mechanically and electrically interchangeable in through-hole applications.

Q: Why is GBU802-G listed as an alternative if it matches KBU8D specifications exactly?

A: GBU802-G matches all provided specifications for the KBU8D: 200V peak reverse voltage, 8A average rectified current, 1V forward voltage at 8A, and -55°C to 150°C operating temperature. It is an exact parametric equivalent from an active manufacturer with current product status and RoHS3 compliance.

Q: Can lower-current parts like GBU402-G or GBU602-G be used?

A: GBU402-G (4A) and GBU602-G (6A) have lower average rectified current ratings than the original 8A specification. These parts are suitable only if your application requires less than their rated current. Do not use these parts in applications requiring the full 8A specification.

Q: What compliance certifications should I verify?

A: GBU8D, GBU802-G, GBU602-G, GBU402-G, and GBU2502-G all carry RoHS3 compliance and REACH unaffected status. Verify that these certifications meet your application and regional requirements before final selection.

Q: Is operating temperature range a critical substitution parameter?

A: Yes. The original KBU8D operates from -55°C to 150°C. GBU8D operates from -50°C to 150°C, which may not be suitable for applications requiring the full -55°C minimum. GBU802-G, GBU602-G, GBU402-G, and GBU2502-G all support -55°C to 150°C and are preferred for temperature-critical applications.

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