MB8M-G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The MB8M-G is a single-phase bridge rectifier diode manufactured by Comchip Technology, rated for 800 V peak reverse voltage with 800 mA average rectified current. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system maintenance and new design implementations. Bridge rectifiers in this voltage and current class are commonly used in power supply circuits, industrial control systems, and consumer electronics requiring AC-to-DC conversion.

Substiute Parts

MB8M-G

Comchip TechnologyIn Stock: 729MB8M-G Datasheet

Current PartRFQ

DF08M

onsemiIn Stock: 8401DF08M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MB8M-G is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Peak Reverse (Max): Must equal or exceed 800 V
• Current - Average Rectified (Io): Must equal or exceed 800 mA
• Voltage - Forward (Vf): Must not exceed 1.1 V at rated current
• Current - Reverse Leakage: Must not exceed 5 µA at 800 V
• Operating Temperature Range: Must encompass -55°C to 150°C

Mechanical Compatibility Criteria:

• Diode Type: Single Phase
• Technology: Standard
• Mounting Type: Through Hole
• Package / Case: 4-DIP configuration

The DF08M manufactured by onsemi meets all electrical requirements and maintains through-hole mounting compatibility. While the package dimensions differ slightly (4-EDIP 0.300" vs. 4-DIP 0.200"), both are 4-pin DIP configurations suitable for standard PCB footprints designed for through-hole bridge rectifiers in this voltage class.

Parameter Comparison

Engineering Selection Recommendations

The DF08M is a direct functional substitute for the MB8M-G. Both components are classified as obsolete, indicating that neither is in active production. The DF08M provides superior current handling capability (1.5 A vs. 800 mA), making it suitable for applications requiring the MB8M-G's electrical specifications with additional design margin.

The primary consideration for selection is PCB footprint compatibility. The MB8M-G uses a 4-DIP package with 0.200" (5.08mm) pin spacing, while the DF08M uses a 4-EDIP package with 0.300" (7.62mm) pin spacing. Both are through-hole configurations with four pins in a standard DIP arrangement. PCB layouts designed for the MB8M-G may require modification to accommodate the DF08M's wider pin spacing, or alternative mounting solutions such as adapter boards or manual lead bending may be necessary.

The DF08M carries RoHS3 compliance and REACH unaffected status, providing regulatory alignment for new designs and system updates.

Frequently Asked Questions (FAQ)

Q: Can the DF08M directly replace the MB8M-G without PCB modification?

A: Electrical substitution is valid. However, mechanical compatibility depends on PCB footprint design. The DF08M's 4-EDIP package (0.300" pin spacing) differs from the MB8M-G's 4-DIP package (0.200" pin spacing). PCBs designed specifically for the MB8M-G may require layout modification or use of adapter solutions.

Q: What are the key electrical differences between these parts?

A: The DF08M has a higher average rectified current rating (1.5 A vs. 800 mA). All other electrical parameters—peak reverse voltage (800 V), forward voltage (1.1 V), reverse leakage current (5 µA), and operating temperature range (-55°C to 150°C)—are identical or equivalent.

Q: Are both parts suitable for new designs?

A: Both the MB8M-G and DF08M are classified as obsolete. For new designs, consultation with component suppliers regarding long-term availability and consideration of active alternative bridge rectifier products in the 800 V, 1+ A class is recommended.

Q: What is the significance of the package designation change from 4-DIP to 4-EDIP?

A: Both designations refer to 4-pin dual inline packages suitable for through-hole mounting. The "E" in 4-EDIP indicates a wider body with increased pin spacing (0.300" vs. 0.200"). This affects PCB hole spacing and component placement but does not alter electrical function or pin configuration.

Q: Does the DF08M's higher current rating affect circuit operation?

A: No. The DF08M's 1.5 A rating exceeds the MB8M-G's 800 mA requirement, providing additional design margin without affecting circuit behavior in applications designed for 800 mA operation.