RS401L-BP Bridge Rectifier Single Phase 50V 4A Equivalent & Substitute Parts

Part Overview

The RS401L-BP is a single-phase bridge rectifier manufactured by Micro Commercial Co, rated for 50V peak reverse voltage and 4A average rectified current in a 4-SIP RS-4L through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Bridge rectifiers in this voltage and current class are used in power supply circuits, battery charging systems, and AC-to-DC conversion applications where single-phase rectification is required. The RS401L-BP specifications establish the baseline for identifying compatible alternatives.

Key Parameters

Parameter	RS401L-BP Value
Voltage - Peak Reverse (Max)	50 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 3 A
Current - Reverse Leakage @ Vr	10 µA @ 50 V
Operating Temperature Range	-55°C ~ 125°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, RS-4L
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the RS401L-BP is determined by the following criteria:

Mandatory Matching Parameters:

Voltage - Peak Reverse (Max): 50 V
Current - Average Rectified (Io): 4 A or greater
Diode Type: Single Phase
Technology: Standard
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Allowable Variations:

Package / Case: Different 4-SIP package designations (RS-4L, GBU, KBL) are acceptable provided mechanical fit is verified
Operating Temperature Range: Extended ranges are acceptable
Voltage - Forward (Vf): Minor variations within engineering tolerance
Current - Reverse Leakage: Lower values are acceptable

The substitute parts listed below meet or exceed the electrical specifications of the RS401L-BP while maintaining compatibility with the application requirements.

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
RS401L-BP	Micro Commercial Co	50 V	4 A	1 V @ 3 A	10 µA @ 50 V	-55°C ~ 125°C	4-SIP, RS-4L	Obsolete
GBU4005-G	Comchip Technology	50 V	4 A	1 V @ 2 A	10 µA @ 50 V	-55°C ~ 150°C	4-SIP, GBU	Active
GBU6005-G	Comchip Technology	50 V	6 A	1 V @ 3 A	10 µA @ 50 V	-55°C ~ 150°C	4-SIP, GBU	Active
GBU8005-G	Comchip Technology	50 V	8 A	1 V @ 4 A	5 µA @ 50 V	-55°C ~ 150°C	4-SIP, GBU	Active
KBL4005-G	Comchip Technology	50 V	4 A	1.1 V @ 4 A	10 µA @ 50 V	-55°C ~ 150°C	4-SIP, KBL	Active
KBU35005-G	Comchip Technology	50 V	35 A	1.1 V @ 17.5 A	10 µA @ 50 V	-55°C ~ 150°C	4-SIP, KBU	Obsolete
GBU25005-G	Comchip Technology	50 V	25 A	1 V @ 12.5 A	10 µA @ 50 V	-55°C ~ 150°C	4-SIP, GBU	Active

Engineering Selection Recommendations

Primary Substitute: GBU4005-G

The GBU4005-G is the direct electrical equivalent to the RS401L-BP, matching the 50V / 4A specifications exactly. This part is manufactured by Comchip Technology and maintains active product status, ensuring long-term availability and supply chain stability. The GBU4005-G is ROHS3 compliant and operates across an extended temperature range (-55°C ~ 150°C), providing superior thermal performance compared to the original part. The 4-SIP GBU package is mechanically compatible with standard through-hole PCB layouts.

Secondary Substitutes: GBU6005-G and GBU8005-G

These parts provide higher current ratings (6A and 8A respectively) while maintaining the 50V voltage specification. Selection of these higher-rated devices is appropriate when circuit design permits increased current capacity or when thermal margin improvement is desired. Both parts are active and ROHS3 compliant.

Alternative Substitute: KBL4005-G

The KBL4005-G matches the 4A current rating and 50V voltage specification of the RS401L-BP. This part uses the KBL package variant and is suitable for applications where package footprint compatibility with KBL-designated designs is required. Forward voltage is slightly elevated at 1.1V compared to 1V for the GBU series.

Not Recommended: KBU35005-G and GBU25005-G

These high-current devices (35A and 25A respectively) exceed the electrical requirements of the RS401L-BP application. While electrically compatible at the voltage level, their use introduces unnecessary cost and thermal considerations. The KBU35005-G is also classified as obsolete, limiting its practical value as a long-term substitute.

Frequently Asked Questions (FAQ)

Q: Can GBU4005-G directly replace RS401L-BP without circuit modification?

A: Yes. The GBU4005-G matches the critical electrical parameters: 50V peak reverse voltage, 4A average rectified current, and single-phase bridge rectifier topology. The 4-SIP through-hole package is mechanically compatible. No circuit modifications are required.

Q: What is the advantage of selecting GBU6005-G or GBU8005-G over the direct equivalent GBU4005-G?

A: Higher current ratings provide additional thermal margin and allow the rectifier to operate at lower junction temperatures under full-load conditions. This extends component life and improves reliability in applications approaching the 4A limit. Selection depends on actual circuit current requirements and thermal design constraints.

Q: Are there package compatibility concerns when switching from RS-4L to GBU or KBL packages?

A: All substitute parts use 4-SIP through-hole packages. Physical pin spacing and lead configuration are standardized across RS-4L, GBU, and KBL designations. PCB footprints designed for standard 4-SIP bridge rectifiers accommodate all listed substitutes without modification.

Q: Why is KBU35005-G listed if it is obsolete?

A: KBU35005-G is included for reference as a documented substitute from the original RS401L-BP specification. However, its obsolete status makes it unsuitable for new designs or long-term procurement. GBU4005-G is the recommended alternative.

Q: Does the extended operating temperature range of substitute parts affect circuit performance?

A: The extended range (-55°C ~ 150°C for GBU and KBL series versus -55°C ~ 125°C for RS401L-BP) provides additional design margin but does not alter electrical performance within the original operating window. Applications operating within -55°C to 125°C experience identical behavior.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the environmental and regulatory status of the original RS401L-BP.

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