KBL4005-G Equivalent & Substitute Parts

Part Overview

The KBL4005-G is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 50 V peak reverse voltage and 4 A average rectified current. This component is classified as Active product status and is RoHS3 compliant. Bridge rectifiers of this specification are used in power supply circuits, battery charging systems, and AC-to-DC conversion applications where single-phase rectification is required. Substitute parts become necessary when the primary part reaches end-of-life, experiences supply constraints, or when design requirements necessitate alternative electrical or mechanical characteristics within the allowed parameter range.

Key Parameters

Parameter	Value	Unit
Voltage - Peak Reverse (Max)	50	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 4	V @ A
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	4-SIP, KBL	—
Diode Type	Single Phase	—
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the KBL4005-G is determined by strict equivalence in the following electrical and mechanical parameters:

Voltage - Peak Reverse (Max): 50 V (exact match required)
Diode Type: Single Phase (exact match required)
Technology: Standard (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -55°C to 150°C minimum (equal or wider range acceptable)
RoHS Status: ROHS3 Compliant (compliance required for new designs)
Current - Average Rectified (Io): 4 A nominal (equal or higher rating acceptable)
Voltage - Forward (Vf) (Max): electrical performance parameter (lower or equal acceptable)
Current - Reverse Leakage @ Vr: electrical performance parameter (lower or equal acceptable)

Substitute parts are grouped by current rating and manufacturer. Parts with identical 4 A current ratings provide direct functional equivalence. Parts with higher current ratings (6 A, 8 A, 10 A) are electrically compatible but represent over-specification. Package variations (4-SIP vs. 4-ESIP) are mechanically compatible in through-hole applications.

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
KBL4005-G	Comchip Technology	50 V	4 A	1.1 V @ 4 A	10 µA @ 50 V	-55 to 150°C	4-SIP, KBL	Active	ROHS3 Compliant
GBU4005	SMC Diode Solutions	50 V	4 A	1.1 V @ 4 A	5 µA @ 50 V	-55 to 150°C	4-ESIP	Active	ROHS3 Compliant
GBU4A	Good-Ark Semiconductor	50 V	3 A	1 V @ 2 A	5 µA @ 50 V	-55 to 150°C	4-SIP, GBU	Active	ROHS3 Compliant
GBU4A-BP	Micro Commercial Co	50 V	4 A	1 V @ 2 A	5 µA @ 50 V	-55 to 150°C	4-SIP, GBU	Not For New Designs	ROHS3 Compliant
GBU6005	SMC Diode Solutions	50 V	6 A	1.1 V @ 6 A	5 µA @ 50 V	-55 to 150°C	4-ESIP	Active	ROHS3 Compliant
GBU6A-BP	Micro Commercial Co	50 V	6 A	1 V @ 3 A	5 µA @ 50 V	-55 to 150°C	4-SIP, GBU	Not For New Designs	ROHS3 Compliant
GBU8005	SMC Diode Solutions	50 V	8 A	1.1 V @ 8 A	5 µA @ 50 V	-55 to 150°C	4-ESIP	Active	ROHS3 Compliant
GBU8A	Fairchild Semiconductor	50 V	5.6 A	1 V @ 8 A	5 µA @ 50 V	-50 to 150°C	4-ESIP, GBU	Active	Not specified
GBU8A-BP	Micro Commercial Co	50 V	8 A	1 V @ 4 A	5 µA @ 50 V	-55 to 150°C	4-SIP, GBU	Not For New Designs	ROHS3 Compliant
GBU10005	SMC Diode Solutions	50 V	10 A	1.1 V @ 10 A	5 µA @ 50 V	-55 to 150°C	4-ESIP	Active	ROHS3 Compliant

Engineering Selection Recommendations

For new designs, select from parts with Active product status and ROHS3 compliance. GBU4005 (SMC Diode Solutions) provides direct electrical and functional equivalence to KBL4005-G with identical 4 A current rating, 50 V voltage specification, and Active status. This part is the primary substitute for new applications.

GBU6005, GBU8005, and GBU10005 are electrically compatible alternatives with higher current ratings (6 A, 8 A, and 10 A respectively). These parts are suitable for applications where increased current capacity is required or where design margins necessitate over-specification. All three maintain 50 V peak reverse voltage, Active product status, and ROHS3 compliance.

GBU8A (Fairchild Semiconductor) offers 5.6 A current capacity and Active status but does not specify RoHS compliance status. This part is suitable for applications where RoHS certification is not a requirement.

Parts designated "Not For New Designs" (GBU4A-BP, GBU6A-BP, GBU8A-BP) are available for legacy system maintenance and repair but should not be selected for new product development. GBU4A (Good-Ark Semiconductor) has a lower 3 A current rating and is not recommended as a direct substitute for 4 A applications.

Frequently Asked Questions (FAQ)

Q: Can GBU4005 directly replace KBL4005-G?

A: Yes. GBU4005 meets all electrical specifications: 50 V peak reverse voltage, 4 A average rectified current, -55°C to 150°C operating range, and ROHS3 compliance. Package differences (4-ESIP vs. 4-SIP) are mechanically compatible in through-hole PCB applications.

Q: What is the difference between 4 A and higher-rated substitutes like GBU6005 or GBU8005?

A: Higher-rated parts (6 A, 8 A, 10 A) are electrically compatible but represent over-specification. They provide additional current capacity margin and lower forward voltage characteristics. Selection depends on circuit design requirements and thermal management considerations.

Q: Why are some parts marked "Not For New Designs"?

A: Parts with this designation (GBU4A-BP, GBU6A-BP, GBU8A-BP) are in end-of-life status. Manufacturers recommend against their use in new product development to ensure long-term supply availability and design stability. These parts remain available for legacy system support.

Q: Does package type affect electrical performance?

A: No. Package type (4-SIP vs. 4-ESIP) affects mechanical mounting and PCB layout but not electrical characteristics. Both package styles are through-hole compatible and electrically equivalent.

Q: Is GBU4A suitable as a substitute?

A: GBU4A has a 3 A current rating, which is below the KBL4005-G specification of 4 A. This part is not recommended for direct substitution in applications requiring 4 A capacity.

Q: What compliance certifications are critical for substitute selection?

A: ROHS3 compliance is mandatory for new designs in regulated markets. All recommended Active-status substitutes meet this requirement. GBU8A does not specify RoHS status and should be evaluated against specific regulatory requirements.

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