Equivalent & Substitute Parts for MB256 Bridge Rectifier

Part Overview

The MB256 is a single-phase bridge rectifier manufactured by Diodes Incorporated, rated for 600 V peak reverse voltage and 25 A average rectified current. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system maintenance and component procurement. The MB256 features QC terminal mounting and operates across a temperature range of -55°C to 150°C, serving applications requiring standard bridge rectification in industrial and power conversion circuits.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	600 V
Current - Average Rectified (Io)	25 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 12.5 A
Current - Reverse Leakage @ Vr	10 µA @ 600 V
Operating Temperature Range	-55°C ~ 150°C
Mounting Type	QC Terminal
Package / Case	4-Square, MB

Substitute Part Grouping Explanation

Substitution eligibility for the MB256 is determined by strict equivalence across the following critical parameters:

Diode Type: Single Phase
Technology: Standard
Voltage - Peak Reverse (Max): 600 V minimum
Current - Average Rectified (Io): 25 A minimum
Mounting Type: QC Terminal compatible
Package / Case: 4-Square form factor

The MB256-BP (Micro Commercial Co) qualifies as a direct equivalent substitute, maintaining identical electrical specifications and QC terminal mounting. The MB356-BP is classified as an uprated substitute, offering increased current capacity (35 A) while maintaining the same voltage rating and mounting interface, suitable for applications requiring higher current handling within the same form factor.

Parameter Comparison

Parameter	MB256 (Diodes Inc.)	MB256-BP (Micro Commercial Co)	MB356-BP (Micro Commercial Co)
Diode Type	Single Phase	Single Phase	Single Phase
Technology	Standard	Standard	Standard
Voltage - Peak Reverse (Max)	600 V	600 V	600 V
Current - Average Rectified (Io)	25 A	25 A	35 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 12.5 A	1.1 V @ 12.5 A	1.1 V @ 17.5 A
Current - Reverse Leakage @ Vr	10 µA @ 600 V	10 µA @ 600 V	10 µA @ 600 V
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 125°C
Mounting Type	QC Terminal	QC Terminal	QC Terminal
Package / Case	4-Square, MB	4-Square, MB-35	4-Square, MB-35
Part Status	Obsolete	Active	Active

Engineering Selection Recommendations

MB256-BP is the direct equivalent substitute for the MB256. Both components maintain identical electrical performance specifications and QC terminal mounting compatibility. The MB256-BP is manufactured by Micro Commercial Co and carries active product status, ensuring continued availability and supply chain reliability. Both the original MB256 and MB256-BP are ROHS3 compliant and carry EAR99 export classification.

MB356-BP represents an uprated alternative suitable for applications where increased current capacity is acceptable. The MB356-BP provides 35 A average rectified current compared to the MB256's 25 A rating, while maintaining the same 600 V voltage specification and QC terminal interface. The operating temperature range for MB356-BP extends to 125°C maximum, compared to 150°C for the MB256. Selection of MB356-BP requires confirmation that the application circuit can accommodate the higher current rating and the reduced upper temperature limit.

Frequently Asked Questions (FAQ)

Q: Can MB256-BP be used as a direct replacement for MB256? A: Yes. MB256-BP maintains identical electrical specifications including 600 V peak reverse voltage, 25 A average rectified current, 1.1 V forward voltage, and QC terminal mounting. Both components operate across -55°C to 150°C.

Q: What is the difference between MB256-BP and MB356-BP? A: MB356-BP provides higher current capacity at 35 A versus 25 A for MB256-BP. Both maintain 600 V voltage rating and QC terminal mounting. MB356-BP operating temperature maximum is 125°C compared to 150°C for MB256-BP.

Q: Are the package dimensions identical between MB256 and MB256-BP? A: Both use 4-Square form factor with QC terminal mounting. MB256 package designation is MB; MB256-BP and MB356-BP use MB-35 designation. Physical compatibility with QC terminal mounting is maintained.

Q: Can MB356-BP be used in applications designed for MB256? A: MB356-BP is suitable for MB256 applications provided the circuit operates within the MB356-BP temperature range (-55°C to 125°C) and the higher current rating does not create design conflicts. The 600 V voltage specification and QC terminal interface are compatible.

Q: What compliance certifications apply to these substitutes? A: MB256-BP carries ROHS3 compliance and EAR99 export classification. MB356-BP is REACH Unaffected and carries EAR99 export classification. Both are suitable for applications requiring these compliance standards.

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