MB4M-G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The MB4M-G is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 400 V peak reverse voltage and 800 mA average rectified current. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. Bridge rectifiers in this voltage and current class are used in AC-to-DC conversion applications requiring through-hole mounting in standard 4-DIP packages.

Substiute Parts

MB4M-G

Comchip TechnologyIn Stock: 815MB4M-G Datasheet

Current PartRFQ

DF04M

onsemiIn Stock: 40296DF04M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MB4M-G is determined by the following critical parameters:

• Voltage Rating: Peak reverse voltage must be 400 V or greater
• Current Rating: Average rectified current must meet or exceed 800 mA
• Diode Type: Single-phase bridge rectifier configuration
• Forward Voltage: Maximum forward voltage drop at rated current
• Reverse Leakage: Leakage current characteristics at rated voltage
• Temperature Range: Operating temperature capability from -55°C to 150°C
• Mounting and Package: Through-hole mounting in 4-DIP package format

The DF04M from onsemi meets these substitution criteria. It maintains the same voltage rating (400 V), exceeds the current requirement (1.5 A vs. 800 mA), shares identical forward voltage characteristics (1.1 V @ 1 A), and operates within the same temperature range (-55°C ~ 150°C). Both components use through-hole mounting with 4-DIP package configurations.

Parameter Comparison

Engineering Selection Recommendations

The DF04M is a direct functional substitute for the MB4M-G based on electrical parameter equivalence. Both components share identical voltage ratings, forward voltage characteristics, and reverse leakage specifications. The DF04M provides higher current capacity (1.5 A vs. 800 mA), which is compatible with applications designed for the MB4M-G.

Both parts are classified as obsolete and carry REACH Unaffected status with EAR99 export classification. The DF04M carries RoHS3 compliance, whereas the MB4M-G compliance status is not specified in available documentation.

Physical package dimensions differ slightly: the MB4M-G uses 4-DIP (0.200", 5.08mm) while the DF04M uses 4-EDIP (0.300", 7.62mm). PCB layout and mounting hole spacing must be verified for mechanical compatibility in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the DF04M replace the MB4M-G in existing designs?

A: Yes, from an electrical standpoint. The DF04M meets all critical electrical parameters: 400 V peak reverse voltage, forward voltage of 1.1 V, and reverse leakage of 5 µA at rated voltage. The higher current rating (1.5 A) is compatible with applications designed for 800 mA. Physical package dimensions must be verified for PCB compatibility.

Q: What is the difference between 4-DIP and 4-EDIP packages?

A: Both are through-hole 4-pin packages for bridge rectifiers. The primary difference is pin spacing: 4-DIP uses 0.200" (5.08mm) spacing while 4-EDIP uses 0.300" (7.62mm) spacing. PCB footprints are not interchangeable without layout modification.

Q: Are both parts still available for procurement?

A: Both the MB4M-G and DF04M are classified as obsolete. The DF04M has significantly higher inventory availability (40,200 pcs) compared to the MB4M-G (758 pcs), making it the more practical choice for new procurement.

Q: What compliance certifications apply to these parts?

A: Both parts carry REACH Unaffected status and EAR99 export classification. The DF04M is RoHS3 compliant. Compliance requirements for specific applications should be verified against design specifications.

Q: Can the MB4M-G be used in place of the DF04M?

A: No. The MB4M-G has a lower current rating (800 mA vs. 1.5 A). Using it in applications requiring the DF04M's higher current capacity would result in component overstress and potential failure.