KBL608G Bridge Rectifier Single Phase 800V 6A Equivalent & Substitute Parts

Part Overview

The KBL608G is a single-phase bridge rectifier manufactured by GeneSiC Semiconductor, rated for 800V peak reverse voltage and 6A average rectified current. This component is classified as Active product status and is RoHS Compliant. Bridge rectifiers in this voltage and current class are used in power supply circuits, industrial equipment, and AC-to-DC conversion applications. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility to ensure proper circuit performance and reliability.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Voltage - Peak Reverse (Max)	800 V
Current - Average Rectified (Io)	6 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 6 A
Current - Reverse Leakage @ Vr	5 µA @ 800 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBL
Technology	Standard
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitute parts for the KBL608G are identified based on the following critical parameters:

Primary Matching Criteria:

Voltage - Peak Reverse (Max): 800 V (exact match required)
Diode Type: Single Phase (exact match required)
Mounting Type: Through Hole (exact match required)
Technology: Standard (exact match required)
Current - Average Rectified (Io): 6 A nominal (parts rated 6 A or higher acceptable)
Operating Temperature Range: -55°C ~ 150°C minimum (exact match or better required)
Current - Reverse Leakage @ Vr: 5 µA @ 800 V (exact match required)

Secondary Compatibility Factors:

Package / Case: 4-SIP GBU or KBL variants (mechanical compatibility)
Voltage - Forward (Vf) (Max) @ If: 1.0 V to 1.1 V range (performance equivalence)
RoHS Compliance: ROHS3 or RoHS Compliant (regulatory alignment)

Parts meeting all primary criteria are classified as direct substitutes. Parts exceeding current ratings (8A, 10A, 15A) remain functionally compatible in applications where the KBL608G is specified, as they operate within the same voltage and temperature envelope.

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	RoHS Status
KBL608G	GeneSiC Semiconductor	800 V	6 A	1.1 V @ 6 A	5 µA @ 800 V	-55°C ~ 150°C	4-SIP, KBL	RoHS Compliant
GBU608	SMC Diode Solutions	800 V	6 A	1.1 V @ 6 A	5 µA @ 800 V	-55°C ~ 150°C	4-ESIP	ROHS3 Compliant
GBU6K-BP	Micro Commercial Co	800 V	6 A	1 V @ 3 A	5 µA @ 800 V	-55°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant
GBU6K	Diotec Semiconductor	800 V	4.2 A	1 V @ 6 A	5 µA @ 800 V	-50°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant
GBU4K-BP	Micro Commercial Co	800 V	4 A	1 V @ 2 A	5 µA @ 800 V	-55°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant
GBU4K	Diotec Semiconductor	800 V	2.8 A	1 V @ 4 A	5 µA @ 800 V	-50°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant
GBU408	Good-Ark Semiconductor	800 V	4 A	1 V @ 2 A	5 µA @ 800 V	-55°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant
GBU808	MDD	800 V	333 mA	1 V @ 4 A	5 µA @ 800 V	-55°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant
GBU1008	MDD	800 V	416 mA	1 V @ 5 A	5 µA @ 800 V	-55°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant
GBU10K-BP	Micro Commercial Co	800 V	10 A	1.1 V @ 5 A	5 µA @ 800 V	-55°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant
GBU15K-BP	Micro Commercial Co	800 V	15 A	1.1 V @ 7.5 A	5 µA @ 800 V	-55°C ~ 150°C	4-SIP, GBU	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

GBU608 (SMC Diode Solutions) is the primary direct substitute. It matches the KBL608G in all critical electrical parameters: 800V peak reverse voltage, 6A average rectified current, 1.1V forward voltage at 6A, and identical reverse leakage specifications. Operating temperature range is -55°C to 150°C. Package variant is 4-ESIP instead of 4-SIP KBL, but both are through-hole configurations with equivalent mechanical footprints. ROHS3 compliance aligns with modern regulatory requirements.

GBU6K-BP (Micro Commercial Co) provides equivalent performance with 6A current rating and matching voltage specifications. Forward voltage is 1V @ 3A, which is within acceptable range. Temperature range matches exactly. Supplied in tube packaging with 4-SIP GBU package. ROHS3 compliant with REACH Unaffected status.

Higher Current Rated Alternatives (Suitable for Uprating Applications):

GBU10K-BP (Micro Commercial Co) and GBU15K-BP (Micro Commercial Co) maintain 800V voltage rating with increased current capacity (10A and 15A respectively). These parts are suitable where circuit design permits higher current handling or where component availability favors higher-rated devices. Both maintain -55°C to 150°C operating range and ROHS3 compliance.

Lower Current Rated Parts (Not Recommended for Direct Replacement):

GBU4K-BP, GBU4K, GBU408, GBU808, and GBU1008 are rated below 6A average rectified current. These parts do not meet the primary current specification and are not suitable as direct substitutes for the KBL608G in applications requiring 6A capacity.

Compliance and Certification:

All substitute parts listed maintain 800V peak reverse voltage and 5µA reverse leakage at 800V. All are ROHS3 compliant or RoHS Compliant. Operating temperature ranges are -55°C to 150°C or -50°C to 150°C, meeting or exceeding the KBL608G specification. All parts are Active product status with current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can GBU608 replace KBL608G directly in my circuit?

A: Yes. GBU608 matches all critical electrical specifications: 800V peak reverse voltage, 6A average rectified current, 1.1V forward voltage at 6A, and 5µA reverse leakage at 800V. Operating temperature range is identical (-55°C to 150°C). The package is 4-ESIP instead of 4-SIP KBL, but both are through-hole configurations with compatible mechanical footprints. Verify PCB layout compatibility before installation.

Q: What is the difference between GBU6K-BP and GBU608?

A: Both parts are rated 800V and 6A. GBU608 has forward voltage of 1.1V @ 6A, while GBU6K-BP specifies 1V @ 3A. Both maintain 5µA reverse leakage at 800V and -55°C to 150°C operating range. GBU608 is packaged as 4-ESIP; GBU6K-BP is 4-SIP GBU. Both are ROHS3 compliant. Selection depends on PCB footprint requirements and forward voltage performance needs.

Q: Can I use GBU10K-BP instead of KBL608G?

A: GBU10K-BP is electrically compatible with KBL608G in terms of voltage (800V) and temperature range (-55°C to 150°C). However, GBU10K-BP is rated for 10A average rectified current, exceeding the 6A specification of KBL608G. This higher rating does not create incompatibility; the part will operate safely in a circuit designed for 6A. Use GBU10K-BP only if circuit design permits or if component availability requires uprating. Verify thermal management is adequate for the higher current-rated device.

Q: Why are GBU4K-BP and GBU408 listed if they are rated below 6A?

A: These parts are included in the substitute list for reference and completeness. They are not suitable as direct replacements for KBL608G because their 4A average rectified current rating is below the 6A requirement. They are listed to clarify why they do not meet substitution criteria and to prevent accidental selection.

Q: What does "4-SIP" and "4-ESIP" package mean for through-hole installation?

A: Both 4-SIP (Single In-line Package) and 4-ESIP (Enhanced Single In-line Package) are through-hole configurations with four leads. They are mechanically compatible for PCB mounting, though pin spacing and lead geometry may differ slightly. Verify PCB footprint dimensions before substituting between these package types. Consult component datasheets for exact lead pitch and hole diameter specifications.

Q: Are all substitute parts RoHS compliant?

A: Yes. KBL608G is RoHS Compliant. All listed substitute parts are either RoHS Compliant or ROHS3 Compliant, meeting current environmental and regulatory standards. ROHS3 represents the latest RoHS directive compliance level.

Q: What is the significance of "Current - Reverse Leakage @ Vr: 5 µA @ 800 V"?

A: Reverse leakage current is the small current that flows through the rectifier when reverse voltage is applied. All parts in this comparison maintain 5µA @ 800V, indicating equivalent leakage characteristics. This parameter is critical for power supply stability and efficiency. Matching this specification ensures predictable circuit behavior.

Q: Can I substitute KBL608G with a part rated for lower temperature range?

A: No. KBL608G operates from -55°C to 150°C. Substitute parts must maintain this temperature range or better. GBU6K and GBU4K are rated -50°C to 150°C, which does not meet the lower temperature requirement. Use only parts rated -55°C to 150°C or wider for direct substitution.

Q: What does "Active" product status mean?

A: Active product status indicates the part is currently manufactured, in production, and available for purchase. All parts listed in this comparison are Active, ensuring supply chain availability and ongoing manufacturer support.

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