KBL604G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBL604G is a single-phase bridge rectifier manufactured by GeneSiC Semiconductor, rated for 400 V peak reverse voltage and 6 A average rectified current. This component is designed for through-hole mounting applications requiring standard bridge rectification in AC-to-DC conversion circuits. The part maintains active product status with 1078 units in stock and carries RoHS compliance certification.

Substitute parts are identified based on matching or exceeding the electrical performance parameters of the KBL604G while maintaining compatibility with the through-hole mounting footprint and operating temperature range. Alternative sources become necessary when primary inventory is depleted, when design flexibility permits higher current ratings, or when alternative manufacturers offer equivalent specifications with improved availability.

Key Parameters

Parameter	KBL604G Value	Unit
Voltage - Peak Reverse (Max)	400	V
Current - Average Rectified (Io)	6	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 6	V @ A
Current - Reverse Leakage @ Vr	5 @ 400	µA @ 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	RoHS Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the KBL604G is based on the following criteria:

Primary Substitution Criteria:

Voltage - Peak Reverse (Max): Must equal or exceed 400 V
Diode Type: Must be Single Phase bridge rectifier
Mounting Type: Must be Through Hole
Operating Temperature Range: Must encompass -55°C to 150°C
Technology: Must be Standard bridge rectifier technology

Secondary Substitution Criteria:

Current - Average Rectified (Io): Equal or higher ratings are acceptable
Voltage - Forward (Vf): Lower or equal values are acceptable
Current - Reverse Leakage: Lower or equal values are acceptable
Package / Case: 4-SIP variants (KBL, GBU) are mechanically compatible
RoHS Status: ROHS3 Compliant parts are acceptable alternatives to RoHS Compliant

Substitute parts are grouped into two categories: Direct Current Rating Matches (6 A to 10 A range) and Higher Current Capacity Alternatives (15 A to 25 A range). Parts with lower current ratings than 6 A are listed as reference alternatives only and are not recommended as primary substitutes.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) V	Ir @ Vr (µA)	Temp Range °C	Package	Status
KBL604G	GeneSiC Semiconductor	400	6	1.1 @ 6A	5 @ 400V	-55 to 150	4-SIP, KBL	Active
GBU604	Taiwan Semiconductor Corporation	400	6	1.1 @ 6A	5 @ 400V	-55 to 150	4-SIP, GBU	Discontinued at DiGi Electronics
GBU1004	Taiwan Semiconductor Corporation	400	10	1.1 @ 10A	5 @ 400V	-55 to 150	4-SIP, GBU	Discontinued at DiGi Electronics
GBU1004-G	Comchip Technology	400	10	1 @ 5A	10 @ 400V	-55 to 150	4-SIP, GBU	Active
GBU1504-G	Comchip Technology	400	15	1 @ 7.5A	10 @ 400V	-55 to 150	4-SIP, GBU	Active
GBU15G-BP	Micro Commercial Co	400	15	1.1 @ 7.5A	5 @ 400V	-55 to 150	4-SIP, GBU	Not For New Designs
GBU2504-G	Comchip Technology	400	25	1 @ 12.5A	10 @ 400V	-55 to 150	4-SIP, GBU	Active
GBU404	Taiwan Semiconductor Corporation	400	4	1.1 @ 4A	5 @ 400V	-55 to 150	4-SIP, GBU	Discontinued at DiGi Electronics
GBU4G	Fairchild Semiconductor	400	2.8	1 @ 4A	5 @ 400V	-50 to 150	4-ESIP, GBU	Active
GBU4G-BP	Micro Commercial Co	400	4	1 @ 2A	5 @ 400V	-55 to 150	4-SIP, GBU	Not For New Designs
GBU6G	Fairchild Semiconductor	400	4.2	1 @ 6A	5 @ 400V	-50 to 150	4-ESIP, GBU	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status):

GBU1004-G (Comchip Technology) and GBU604 (Taiwan Semiconductor Corporation) provide the closest electrical equivalence to the KBL604G. The GBU1004-G offers a 10 A current rating with identical 400 V peak reverse voltage and maintains the -55°C to 150°C operating temperature range. This part carries active product status and ROHS3 compliance. The GBU604 matches the KBL604G specification exactly at 6 A, though it is discontinued at DiGi Electronics.

Higher Current Capacity Alternatives (Active Status):

GBU1504-G (Comchip Technology) and GBU2504-G (Comchip Technology) provide 15 A and 25 A ratings respectively, both maintaining 400 V peak reverse voltage and the required operating temperature range. These parts are suitable for applications where the design permits higher current capacity without circuit modification. Both carry active product status and ROHS3 compliance.

Parts Not Recommended for New Designs:

GBU15G-BP and GBU4G-BP carry "Not For New Designs" status and should not be selected for new circuit implementations, despite meeting electrical parameters.

Compliance Considerations:

All recommended substitute parts maintain RoHS compliance (either RoHS Compliant or ROHS3 Compliant) and carry EAR99 ECCN classification matching the KBL604G. Moisture Sensitivity Level (MSL) is 1 (Unlimited) across all active alternatives, indicating no special moisture handling requirements.

Frequently Asked Questions (FAQ)

Q: Can GBU1004-G replace KBL604G directly?

A: GBU1004-G meets all critical electrical parameters: 400 V peak reverse voltage, -55°C to 150°C operating temperature, and through-hole mounting. The 10 A current rating exceeds the 6 A requirement of KBL604G. The primary difference is the package designation (GBU versus KBL), though both are 4-SIP through-hole configurations. Physical footprint compatibility should be verified against the specific PCB layout.

Q: What is the difference between GBU604 and GBU1004?

A: GBU604 and GBU1004 differ only in current rating: GBU604 is rated for 6 A while GBU1004 is rated for 10 A. Both maintain identical 400 V peak reverse voltage, forward voltage characteristics, and operating temperature range. GBU1004 provides additional current capacity margin for the same voltage specification.

Q: Are Fairchild GBU4G and GBU6G suitable substitutes?

A: GBU4G and GBU6G are not recommended as primary substitutes. GBU4G provides only 2.8 A average rectified current, which is below the 6 A requirement. GBU6G provides 4.2 A, also below specification. Additionally, both parts specify -50°C to 150°C operating temperature, which does not fully encompass the -55°C lower limit of KBL604G. These parts are listed as reference alternatives only.

Q: Why are some parts marked "Discontinued at DiGi Electronics"?

A: Parts marked "Discontinued at DiGi Electronics" are no longer available through this specific distributor but may remain available through alternative sources. These parts retain full electrical equivalence to KBL604G and can be used if sourced from other suppliers. However, active status parts are preferred for new designs to ensure long-term availability.

Q: What does "Not For New Designs" status mean?

A: Parts with "Not For New Designs" status are in end-of-life phase and should not be selected for new circuit implementations. While they meet electrical specifications, their availability is limited and will eventually cease. GBU15G-BP and GBU4G-BP carry this designation and should be avoided for new projects.

Q: Can I use a higher current rated part like GBU2504-G (25 A) in place of KBL604G (6 A)?

A: GBU2504-G meets all electrical parameters and exceeds current capacity. Substitution is electrically valid if the circuit design permits the higher current rating. No circuit modification is required; the higher-rated component will operate safely at lower current levels. Verify that the PCB layout and thermal management accommodate the physical dimensions of the GBU package.

Q: What is the significance of forward voltage (Vf) differences between parts?

A: Forward voltage differences are minor across all listed substitutes (1.0 V to 1.1 V range). These variations fall within normal operating tolerances and do not affect circuit functionality in standard bridge rectifier applications. Lower forward voltage values (1.0 V) represent slightly improved efficiency compared to 1.1 V specifications.

Q: Are all substitute parts RoHS compliant?

A: All active and recommended substitute parts carry either RoHS Compliant or ROHS3 Compliant certification, matching the compliance status of KBL604G. This ensures compatibility with RoHS-regulated applications and procurement requirements.

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