KBL401G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBL401G is a single-phase bridge rectifier manufactured by GeneSiC Semiconductor, rated for 50 V peak reverse voltage and 4 A 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 AC-to-DC conversion applications requiring through-hole mounting and standard rectification technology. Identifying equivalent and substitute parts is necessary when managing inventory constraints, addressing supply chain variations, or matching specific manufacturing certifications and packaging requirements.

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	5	µA @ 50 V
Operating Temperature Range	-50 to 150	°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBL
Diode Type	Single Phase
Technology	Standard

Substitute Part Grouping Explanation

Substitution of bridge rectifier diodes is determined by strict equivalence across the following critical parameters:

Voltage Rating: Peak reverse voltage must be equal or greater than the original specification (50 V minimum).

Current Rating: Average rectified current must meet or exceed the original specification (4 A minimum).

Forward Voltage Characteristics: Forward voltage drop at rated current must not exceed the original specification to ensure thermal and efficiency compatibility.

Reverse Leakage Current: Leakage characteristics must be within acceptable limits to maintain circuit performance.

Mounting Type and Package: Through-hole mounting and 4-SIP package configuration must be maintained for mechanical and electrical compatibility.

Operating Temperature Range: The component must support the required temperature envelope.

Diode Type and Technology: Single-phase standard rectification technology must be preserved.

Based on these criteria, the following parts are identified as substitutes for the KBL401G:

Parametric Equivalent: KBL005-E4/51 (Vishay General Semiconductor - Diodes Division) matches all electrical and mechanical parameters identically.

Similar Specification Part: KBU35005-G (Comchip Technology) shares the same voltage rating and package family but operates at a higher current rating (35 A vs. 4 A), making it suitable only in applications where the higher current capacity does not create thermal or cost constraints.

Parameter Comparison

Parameter	KBL401G (GeneSiC)	KBL005-E4/51 (Vishay)	KBU35005-G (Comchip)
Manufacturer	GeneSiC Semiconductor	Vishay General Semiconductor - Diodes Division	Comchip Technology
Product Status	Active	Active	Obsolete
Voltage - Peak Reverse (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	4 A	4 A	35 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 4 A	1.1 V @ 4 A	1.1 V @ 17.5 A
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	10 µA @ 50 V
Operating Temperature Range	-50 to 150°C (TJ)	-50 to 150°C (TJ)	-55 to 150°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	4-SIP, KBL	4-SIP, KBL	4-SIP, KBU
Diode Type	Single Phase	Single Phase	Single Phase
Technology	Standard	Standard	Standard
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Not Applicable	1 (Unlimited)

Engineering Selection Recommendations

Direct Parametric Equivalent: KBL005-E4/51 from Vishay General Semiconductor - Diodes Division is the direct parametric equivalent to KBL401G. Both components share identical electrical specifications (50 V, 4 A, 1.1 V forward voltage, 5 µA leakage) and identical operating temperature range (-50 to 150°C). Both are Active product status. The KBL005-E4/51 carries ROHS3 Compliant certification and REACH Unaffected status, providing enhanced regulatory compliance documentation. This part is suitable for direct substitution in all applications where KBL401G is specified.

Higher Current Capacity Alternative: KBU35005-G from Comchip Technology shares the same 50 V voltage rating and through-hole 4-SIP package family. However, this part is rated for 35 A average rectified current, significantly exceeding the 4 A requirement of KBL401G. The KBU35005-G is classified as Obsolete product status, which may present long-term supply chain risk. Selection of this part should be limited to applications where the higher current capacity is required and obsolescence risk is acceptable. The KBU35005-G carries ROHS3 Compliant and REACH Unaffected certifications.

Compliance Considerations: All three parts meet RoHS compliance requirements. The Vishay KBL005-E4/51 provides the most current regulatory documentation (ROHS3 Compliant, REACH Unaffected). The GeneSiC KBL401G is RoHS Compliant. The Comchip KBU35005-G is ROHS3 Compliant with REACH Unaffected status but carries Obsolete product status designation.

Frequently Asked Questions (FAQ)

Q: Can KBL005-E4/51 be used as a direct replacement for KBL401G?

A: Yes. The KBL005-E4/51 is a parametric equivalent with identical electrical specifications, operating temperature range, and package configuration. Both components are rated for 50 V, 4 A, with 1.1 V forward voltage and 5 µA reverse leakage current. Both support through-hole mounting in 4-SIP KBL package format.

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

A: KBL and KBU are both 4-SIP through-hole package formats for single-phase bridge rectifiers. The primary distinction is the current rating class for which each package is typically optimized. KBL packages are standard for lower current ratings (4 A range), while KBU packages are standard for higher current ratings (35 A range). Both packages are mechanically compatible with through-hole PCB mounting.

Q: Why is KBU35005-G listed as a substitute if it has a higher current rating?

A: KBU35005-G shares the same 50 V voltage rating and through-hole mounting type as KBL401G. In applications where circuit design permits use of a higher current-rated component without thermal or cost penalties, the KBU35005-G can function in the circuit. However, the higher current rating is not required for KBL401G applications, and the Obsolete product status of KBU35005-G presents supply chain considerations.

Q: Are there any thermal or efficiency differences between these parts?

A: Forward voltage specifications are identical for KBL401G and KBL005-E4/51 at their respective rated currents (1.1 V @ 4 A). The KBU35005-G specifies forward voltage at 17.5 A (half its rated current), which is not directly comparable at the 4 A operating point. Reverse leakage current for KBU35005-G is 10 µA @ 50 V, compared to 5 µA @ 50 V for both KBL401G and KBL005-E4/51.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active product status indicates the manufacturer continues production and supports the component. Obsolete status indicates the manufacturer has discontinued production. For long-term design and supply chain planning, Active status components are preferred. KBL401G and KBL005-E4/51 are both Active. KBU35005-G is Obsolete.

Q: Do all three parts meet current RoHS requirements?

A: Yes. KBL401G is RoHS Compliant. KBL005-E4/51 and KBU35005-G are both ROHS3 Compliant. ROHS3 represents the current regulatory standard. All three parts meet RoHS compliance requirements for lead-free and restricted substance content.

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