RMB4S-E3/45 Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The RMB4S-E3/45 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, rated for 400 V peak reverse voltage with 500 mA average rectified current. This component is actively produced and widely used in power supply and rectification applications requiring surface mount integration in TO-269AA packaging.

Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits operation within alternative electrical specifications. All substitute parts listed maintain compatibility with the core functional requirements of single-phase bridge rectification while operating within specified thermal and electrical parameters.

Key Parameters

Parameter	RMB4S-E3/45
Diode Type	Single Phase
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	500 mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 400 mA
Current - Reverse Leakage @ Vr	5 µA @ 400 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-269AA, 4-BESOP
Technology	Standard
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the RMB4S-E3/45 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Diode Type: Single Phase (all substitutes must maintain this classification)
Mounting Type: Surface Mount (all substitutes must be surface mount)
Package / Case: TO-269AA, 4-BESOP or equivalent MBS package footprint
Operating Temperature Range: Must support -55°C ~ 150°C or equivalent range
Current - Average Rectified (Io): Must equal or exceed 500 mA
Voltage - Peak Reverse (Max): Must equal or exceed 400 V

Acceptable Variation Parameters:

Voltage - Forward (Vf): Variations within standard rectifier specifications are acceptable
Current - Reverse Leakage: Variations within standard rectifier specifications are acceptable
Manufacturer: Different manufacturers producing equivalent MBS bridge rectifiers are acceptable

All substitute parts listed meet or exceed the mandatory compatibility criteria. Parts with higher voltage ratings (MB10S at 1 kV, MB6S at 600 V, MB8S at 800 V) are electrically compatible for applications where the RMB4S-E3/45 operates below its maximum voltage specification.

Parameter Comparison

Parameter	RMB4S-E3/45	MB10S	MB1S	MB2S	MB4S	MB6S	MB8S
Manufacturer	Vishay	MDD	SMC Diode Solutions	Good-Ark Semiconductor	Diotec Semiconductor	MDD	Fairchild Semiconductor
Diode Type	Single Phase	Single Phase	Single Phase	Single Phase	Single Phase	Single Phase	Single Phase
Voltage - Peak Reverse (Max)	400 V	1 kV	100 V	200 V	400 V	600 V	800 V
Current - Average Rectified (Io)	500 mA	1 A	500 mA	500 mA	500 mA	500 mA	500 mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 400 mA	1.1 V @ 400 mA	1 V @ 500 mA	1 V @ 400 mA	1 V @ 400 mA	1 V @ 500 mA	1 V @ 400 mA
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 1000 V	5 µA @ 100 V	5 µA @ 200 V	5 µA @ 400 V	5 µA @ 600 V	5 µA @ 800 V
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	-50°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-269AA, 4-BESOP	TO-269AA, 4-BESOP	4-SMD, Gull Wing	TO-269AA, 4-BESOP	TO-269AA, 4-BESOP	4-SMD, Gull Wing	TO-269AA, 4-BESOP
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	Not applicable	ROHS3 Compliant	Not specified
Product Status	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Equivalent (Identical Specifications): MB4S (Diotec Semiconductor) matches the RMB4S-E3/45 in voltage rating (400 V) and current rating (500 mA) with identical package footprint (TO-269AA, 4-BESOP). This part is the primary direct substitute when supply of the original part is unavailable.

Higher Voltage Rated Substitutes (Backward Compatible): MB10S (1 kV), MB6S (600 V), and MB8S (800 V) provide higher voltage ratings than the RMB4S-E3/45 and are electrically compatible for circuits operating at 400 V or below. These parts are suitable for applications where the design permits operation with higher voltage-rated components without performance degradation.

Lower Voltage Rated Substitutes (Application-Dependent): MB2S (200 V) and MB1S (100 V) have lower voltage ratings than the RMB4S-E3/45. These parts are suitable only for applications where the actual operating voltage does not exceed their respective peak reverse voltage ratings.

Compliance Considerations: All substitute parts maintain active product status. RoHS3 compliance is confirmed for RMB4S-E3/45, MB10S, MB1S, MB2S, and MB6S. MB4S and MB8S have undefined or not applicable RoHS status; compliance verification with the component supplier is required for applications with RoHS mandates.

Package Footprint Compatibility: MB4S, MB10S, and MB8S maintain TO-269AA, 4-BESOP package compatibility with the original part. MB1S and MB6S use 4-SMD Gull Wing packaging, which requires PCB layout verification for footprint compatibility. MB2S maintains TO-269AA, 4-BESOP compatibility.

Frequently Asked Questions (FAQ)

Q: Can MB1S or MB2S be used as substitutes for the RMB4S-E3/45? A: MB1S (100 V) and MB2S (200 V) have lower voltage ratings than the RMB4S-E3/45 (400 V). These parts are suitable only if the application circuit operates at voltages not exceeding 100 V and 200 V respectively. For circuits designed for 400 V operation, these parts are not appropriate substitutes.

Q: What is the advantage of using MB10S, MB6S, or MB8S instead of the RMB4S-E3/45? A: These higher voltage-rated parts (1 kV, 600 V, and 800 V respectively) provide additional voltage margin for circuits operating at 400 V. They are electrically compatible and may be selected when supply availability favors these alternatives. No performance degradation occurs in 400 V applications when using higher voltage-rated bridge rectifiers.

Q: Are MB1S and MB6S compatible with the original PCB layout? A: MB1S and MB6S use 4-SMD Gull Wing packaging, while the RMB4S-E3/45 uses TO-269AA, 4-BESOP packaging. PCB footprint verification is required before substitution. The other substitute parts (MB10S, MB2S, MB4S, MB8S) maintain TO-269AA, 4-BESOP compatibility.

Q: What is the difference between MB4S and RMB4S-E3/45? A: MB4S (Diotec Semiconductor) and RMB4S-E3/45 (Vishay) are electrically equivalent with identical voltage (400 V) and current (500 mA) ratings. Both use TO-269AA, 4-BESOP packaging. The primary difference is the manufacturer. MB4S operating temperature range is -50°C ~ 150°C versus -55°C ~ 150°C for the RMB4S-E3/45.

Q: Are all substitute parts RoHS compliant? A: RoHS3 compliance is confirmed for RMB4S-E3/45, MB10S, MB1S, MB2S, and MB6S. MB4S has not applicable RoHS status, and MB8S has not specified RoHS status. For applications requiring RoHS compliance, direct confirmation with the component supplier is necessary for MB4S and MB8S.

Q: Can substitute parts with higher current ratings (MB10S at 1 A) be used in place of the RMB4S-E3/45 (500 mA)? A: Yes. MB10S with 1 A average rectified current is compatible with applications designed for 500 mA operation. Higher current ratings provide additional capacity without affecting circuit performance at lower current levels.

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