KBL08 Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBL08 is a single-phase bridge rectifier manufactured by onsemi, rated for 800 V peak reverse voltage and 4 A average rectified current. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The KBL08 operates across a temperature range of -55°C to 150°C and is packaged in a 4-SIP through-hole configuration. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while supporting modern supply chain availability.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	800 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 4 A
Current - Reverse Leakage @ Vr	5 µA @ 800 V
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBL
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the KBL08 are qualified based on the following criteria:

Mandatory Electrical Parameters:

Voltage - Peak Reverse (Max): 800 V minimum
Diode Type: Single Phase
Technology: Standard
Operating Temperature Range: -55°C to 150°C minimum
Mounting Type: Through Hole
Package / Case: 4-SIP configuration

Current Rating Consideration: Substitute parts with equal or higher average rectified current (Io) ratings are acceptable. The KBL08 specifies 4 A; substitutes rated at 4 A, 4.2 A, 6 A, or 8 A meet this requirement.

Forward Voltage Compatibility: Forward voltage specifications vary across substitutes but remain within acceptable operating ranges for standard bridge rectifier applications.

All qualified substitutes are manufactured by Comchip Technology and maintain active product status with RoHS3 compliance, ensuring long-term availability and regulatory alignment.

Parameter Comparison

Parameter	KBL08 (onsemi)	GBU408-G (Comchip)	GBU608-G (Comchip)	GBU808-G (Comchip)	GBU2508-G (Comchip)
Voltage - Peak Reverse (Max)	800 V	800 V	800 V	800 V	800 V
Current - Average Rectified (Io)	4 A	4 A	6 A	8 A	4.2 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 4 A	1 V @ 2 A	1 V @ 3 A	1 V @ 4 A	1 V @ 12.5 A
Current - Reverse Leakage @ Vr	5 µA @ 800 V	10 µA @ 800 V	10 µA @ 800 V	10 µA @ 800 V	10 µA @ 800 V
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	4-SIP, KBL	4-SIP, GBU	4-SIP, GBU	4-SIP, GBU	4-SIP, GBU
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

GBU408-G provides a direct current rating match at 4 A with identical voltage specifications. This part is recommended for applications requiring exact electrical equivalence to the KBL08. Active product status ensures supply chain continuity.

GBU2508-G offers a marginally higher current rating of 4.2 A, providing minimal headroom above the KBL08 specification. This part is suitable for applications where slight current margin is acceptable.

GBU608-G and GBU808-G provide higher current ratings of 6 A and 8 A respectively. These parts are appropriate for applications where increased current capacity is beneficial or where design margins require higher ratings.

All substitute parts maintain 800 V peak reverse voltage, -55°C to 150°C operating temperature range, and through-hole 4-SIP packaging. All Comchip Technology substitutes carry ROHS3 compliance and active product status, supporting modern regulatory requirements and long-term procurement availability.

Frequently Asked Questions (FAQ)

Q: Can GBU408-G directly replace KBL08 in existing designs? A: Yes. GBU408-G matches the KBL08 across all critical electrical parameters: 800 V peak reverse voltage, 4 A average rectified current, and -55°C to 150°C operating temperature. Both use 4-SIP through-hole packaging. Physical pin configuration must be verified against PCB layout.

Q: What is the difference between GBU408-G, GBU608-G, and GBU808-G? A: These parts differ in average rectified current ratings: GBU408-G is rated 4 A, GBU608-G is rated 6 A, and GBU808-G is rated 8 A. All maintain identical 800 V voltage specifications and operating temperature range. Higher current ratings provide design margin for applications with variable load conditions.

Q: Why is GBU2508-G listed as a substitute if its current rating is only 4.2 A? A: GBU2508-G meets substitution criteria with a current rating equal to or exceeding the KBL08 specification of 4 A. The 4.2 A rating provides minimal additional capacity while maintaining full electrical compatibility.

Q: Are all substitute parts RoHS compliant? A: Yes. All Comchip Technology substitutes (GBU408-G, GBU608-G, GBU808-G, GBU2508-G) are ROHS3 compliant. The original KBL08 RoHS status is not specified in available documentation.

Q: Does package size differ between KBL and GBU variants? A: Both KBL and GBU variants use 4-SIP through-hole packaging. Physical dimensions and pin spacing are equivalent, supporting direct PCB substitution without layout modification.

Q: What is the significance of the forward voltage difference between KBL08 and substitute parts? A: The KBL08 specifies 1.1 V forward voltage at 4 A, while substitutes specify 1 V at their respective test currents. These differences are within normal operating tolerances for standard bridge rectifier applications and do not affect functional compatibility.

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