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

Part Overview

The RS401L 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 through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Bridge rectifiers in this voltage and current class are widely used in power supply circuits, battery chargers, and AC-to-DC conversion applications where standard rectification technology is required.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	50 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max)	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 for the RS401L is determined by strict equivalence across the following critical parameters:

Voltage Rating: Peak reverse voltage must equal 50V
Current Rating: Average rectified current must equal 4A
Diode Type: Single phase bridge rectifier configuration
Technology: Standard rectification technology
Mounting: Through-hole package format
Compliance: ROHS3 compliance and REACH unaffected status

Parts meeting these criteria are classified as direct electrical equivalents. Parts with higher current ratings (6A, 8A, 25A, 35A) are functional substitutes suitable for applications where the RS401L is specified, as they maintain the same voltage rating and package mounting while providing increased current capacity. Parts with different forward voltage characteristics or package designations (GBU vs. KBL vs. RS-4L) remain electrically compatible within the same voltage and current class.

Parameter Comparison

Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max)	Operating Temperature	Package / Case	Product Status	Inventory
RS401L	Micro Commercial Co	50 V	4 A	1 V @ 3 A	-55°C ~ 125°C	4-SIP, RS-4L	Obsolete	1108 Pcs
GBU4005-G	Comchip Technology	50 V	4 A	1 V @ 2 A	-55°C ~ 150°C	4-SIP, GBU	Active	848 Pcs
KBL4005-G	Comchip Technology	50 V	4 A	1.1 V @ 4 A	-55°C ~ 150°C	4-SIP, KBL	Active	975 Pcs
GBU6005-G	Comchip Technology	50 V	6 A	1 V @ 3 A	-55°C ~ 150°C	4-SIP, GBU	Active	1089 Pcs
GBU8005-G	Comchip Technology	50 V	8 A	1 V @ 4 A	-55°C ~ 150°C	4-SIP, GBU	Active	930 Pcs
GBU25005-G	Comchip Technology	50 V	25 A	1 V @ 12.5 A	-55°C ~ 150°C	4-SIP, GBU	Active	954 Pcs
KBU35005-G	Comchip Technology	50 V	35 A	1.1 V @ 17.5 A	-55°C ~ 150°C	4-SIP, KBU	Obsolete	1065 Pcs

Engineering Selection Recommendations

Direct Electrical Equivalents (4A Rating)

GBU4005-G and KBL4005-G are direct electrical equivalents to the RS401L, maintaining identical 50V/4A ratings. Both are manufactured by Comchip Technology and carry active product status with ROHS3 compliance. GBU4005-G operates across an extended temperature range (-55°C to 150°C versus -55°C to 125°C) and is recommended for applications requiring broader thermal performance. KBL4005-G provides similar extended temperature range with slightly elevated forward voltage (1.1V @ 4A). Both parts are available in through-hole 4-SIP packages suitable for direct PCB mounting.

Functional Substitutes (Higher Current Ratings)

GBU6005-G (6A), GBU8005-G (8A), GBU25005-G (25A), and KBU35005-G (35A) are functional substitutes maintaining the 50V voltage rating while providing increased current capacity. These parts are suitable for applications where the RS401L is specified and current margin is beneficial. All active-status parts (GBU6005-G, GBU8005-G, GBU25005-G) carry ROHS3 compliance and extended operating temperature ranges. KBU35005-G, though classified as obsolete, remains available in inventory and maintains full compliance certification.

Compliance and Certification

All listed substitute parts maintain ROHS3 compliance, REACH unaffected status, and identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications as the RS401L. Moisture sensitivity level remains at MSL 1 (Unlimited) across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can GBU4005-G directly replace RS401L in existing designs?

A: Yes. GBU4005-G maintains identical electrical ratings (50V, 4A) and through-hole 4-SIP package format. The primary difference is the package designation (GBU versus RS-4L) and extended operating temperature range (-55°C to 150°C). PCB footprints are compatible for standard through-hole mounting.

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

A: Both GBU and KBL are 4-SIP through-hole package formats for single-phase bridge rectifiers. The primary electrical difference is forward voltage specification: GBU4005-G specifies 1V @ 2A, while KBL4005-G specifies 1.1V @ 4A. Both are mechanically compatible with RS401L footprints.

Q: Can I use a higher-current-rated part like GBU8005-G instead of RS401L?

A: Yes. Higher-current-rated parts (6A, 8A, 25A, 35A) are functional substitutes for the 4A RS401L. They maintain the same 50V voltage rating and through-hole mounting. The increased current capacity provides design margin and does not degrade performance in 4A applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the RS401L compliance status. All parts are REACH unaffected.

Q: What is the temperature operating range difference between RS401L and substitute parts?

A: RS401L operates from -55°C to 125°C. Active substitute parts (GBU series and KBL4005-G) operate from -55°C to 150°C, providing 25°C additional high-temperature margin. This extended range is beneficial for applications with elevated ambient or self-heating conditions.

Q: Is KBU35005-G suitable for new designs despite obsolete status?

A: KBU35005-G is available in inventory (1065 pcs) and maintains full ROHS3 compliance and certification. However, for new designs, active-status alternatives (GBU25005-G) are preferred to ensure long-term supply continuity.

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