MA3D749 Equivalent & Substitute Parts

Part Overview

The MA3D749 is a Schottky diode array manufactured by Panasonic Electronic Components, configured as a 1 Pair Common Cathode arrangement with a maximum reverse voltage rating of 40 V and average rectified current of 5 A per diode. The device is packaged in a Through Hole TO-220-3 Full Pack configuration and features fast recovery characteristics suitable for rectification applications.

The MA3D749 is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Substiute Parts

MA3D749

Panasonic Electronic ComponentsIn Stock: 773MA3D749 Datasheet

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RB205T-40

Rohm SemiconductorIn Stock: 2411RB205T-40 Datasheet

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RB225T-40

Rohm SemiconductorIn Stock: 803RB225T-40 Datasheet

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SBR4040CTFP

Diodes IncorporatedIn Stock: 2685SBR4040CTFP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MA3D749 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Diode Configuration: 1 Pair Common Cathode
• Technology: Schottky or Super Barrier (compatible fast-switching technology)
• Voltage - DC Reverse (Vr) (Max): Equal to or greater than 40 V
• Mounting Type: Through Hole
• Package / Case: TO-220-3 Full Pack

Current Rating Consideration: Substitute parts must have an average rectified current rating equal to or greater than 5 A per diode to maintain or exceed the original design capability.

Thermal and Electrical Performance: Substitute parts must maintain fast recovery characteristics (≤ 500 ns, > 200 mA) and operate within compatible temperature ranges.

The substitute parts identified below meet all mandatory compatibility criteria and are available as active products with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

RB205T-40 (Rohm Semiconductor)

The RB205T-40 is an active product with ROHS3 compliance and REACH unaffected status. It provides a direct functional upgrade with 7.5 A current rating, exceeding the MA3D749 specification of 5 A. The device maintains identical 40 V reverse voltage rating, fast recovery characteristics, and TO-220-3 Full Pack configuration. This part is suitable for direct substitution in applications where the increased current capacity does not create thermal or design constraint issues.

RB225T-40 (Rohm Semiconductor)

The RB225T-40 is an active product with ROHS3 compliance and REACH unaffected status. It provides enhanced current capacity at 15 A per diode with maintained 40 V reverse voltage rating and fast recovery performance. The forward voltage increases to 630 mV at 15 A. This part is suitable for applications requiring higher current handling capability than the original MA3D749 specification.

SBR4040CTFP (Diodes Incorporated)

The SBR4040CTFP is an active product with ROHS3 compliance and REACH unaffected status. It utilizes Super Barrier technology with 20 A current rating and maintains 40 V reverse voltage specification. The device features an isolated tab configuration (ITO-220AB package) and operates across an extended temperature range of -65°C to 150°C. Forward voltage is 530 mV at 20 A. This part provides the highest current capacity and widest operating temperature range among available substitutes.

All three substitute parts maintain the mandatory compatibility criteria: 1 Pair Common Cathode configuration, Through Hole mounting, TO-220-3 Full Pack package family, and fast recovery switching characteristics.

Frequently Asked Questions (FAQ)

Q: Can the RB205T-40 directly replace the MA3D749 in all applications?

A: The RB205T-40 meets all mandatory compatibility criteria: identical 40 V reverse voltage rating, 1 Pair Common Cathode configuration, Through Hole mounting, and TO-220-3 Full Pack package. The 7.5 A current rating exceeds the MA3D749 specification of 5 A. Substitution is valid provided the application does not impose constraints related to the different supplier device package designation (TO-220FN versus TO-220D-A1) or thermal management differences.

Q: What is the difference between Schottky and Super Barrier technology in the context of these diodes?

A: Both Schottky and Super Barrier are fast-switching diode technologies meeting the specified fast recovery characteristic of ≤ 500 ns. The SBR4040CTFP employs Super Barrier technology, which is a variant of Schottky technology. Both maintain compatibility with the application requirements defined by the MA3D749 specification.

Q: Does the isolated tab configuration of the SBR4040CTFP affect substitution compatibility?

A: The SBR4040CTFP features an isolated tab (ITO-220AB package) compared to the standard TO-220-3 Full Pack of the MA3D749. The isolated tab provides electrical isolation between the tab and the diode cathode, which may be beneficial in certain thermal management or circuit isolation scenarios. PCB layout and mounting hardware must accommodate the ITO-220AB package specification. Mechanical compatibility with existing mounting hardware must be verified.

Q: Are all substitute parts RoHS compliant?

A: Yes. The RB205T-40, RB225T-40, and SBR4040CTFP are all ROHS3 compliant. The MA3D749 RoHS status is not specified in the provided data.

Q: What is the significance of the reverse leakage current difference between the MA3D749 and substitute parts?

A: The MA3D749 specifies 1 mA reverse leakage at 40 V, while substitute parts specify 300 µA to 500 µA at 40 V. Lower reverse leakage current in substitute parts indicates improved leakage performance. This difference does not prevent substitution and may provide improved circuit performance in applications sensitive to leakage current.

Q: Can the higher current-rated parts (RB225T-40 at 15 A or SBR4040CTFP at 20 A) be used in place of the 5 A MA3D749?

A: Yes. Both parts meet all mandatory compatibility criteria and provide current ratings exceeding the MA3D749 specification. Higher current capacity does not prevent substitution. Application-specific considerations such as thermal dissipation, PCB layout, and circuit design must be evaluated to ensure the substitute part does not introduce unintended performance changes.

Q: What is the impact of the different maximum junction temperature ratings?

A: The MA3D749 operates to 125°C maximum junction temperature. The RB205T-40 and RB225T-40 operate to 150°C maximum, and the SBR4040CTFP operates from -65°C to 150°C. Higher maximum temperature ratings provide expanded operating range and may improve thermal margin in high-temperature applications. Substitution is valid across all temperature ranges specified for the original application.