MR751 Equivalent & Substitute Parts

Part Overview

The MR751 is a general-purpose rectifier diode manufactured by onsemi, rated for 100 V DC reverse voltage and 6 A average rectified current. The device features a through-hole Microde Button package with standard recovery characteristics and operates across a junction temperature range of -65°C to 175°C.

The MR751 is classified as obsolete. 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

MR751

onsemiIn Stock: 1215MR751 Datasheet

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6A1-TP

Micro Commercial CoIn Stock: 16386A1-TP Datasheet

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GI751-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 21962GI751-E3/54 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MR751 are qualified based on the following electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) (Max): 100 V minimum
• Current - Average Rectified (Io): 6 A minimum
• Voltage - Forward (Vf) (Max) @ If: within acceptable operating range
• Speed: Standard Recovery classification
• Mounting Type: Through Hole

Mechanical Compatibility Criteria:

• Package / Case: Axial through-hole configuration
• Supplier Device Package: Compatible with circuit board layout requirements

Substitute parts must satisfy all electrical parameters at or above the MR751 specification level. Package variations are acceptable provided the through-hole axial mounting type is maintained and physical dimensions accommodate existing PCB footprints.

Parameter Comparison

Engineering Selection Recommendations

GI751-E3/54 (Vishay General Semiconductor - Diodes Division)

The GI751-E3/54 is the primary substitute for the MR751. This part meets all electrical specifications with equivalent forward voltage (900 mV @ 6 A) and superior reverse leakage characteristics (5 µA @ 100 V versus 25 µA @ 100 V). The GI751-E3/54 carries Active product status and ROHS3 compliance, supporting long-term design continuity and regulatory requirements. The P600 package is a standard through-hole axial configuration compatible with existing MR751 PCB layouts. Operating temperature range (-50 to 150°C) covers the majority of industrial applications, with the exception of designs requiring the full -65°C lower limit of the MR751.

6A1-TP (Micro Commercial Co)

The 6A1-TP qualifies as a secondary substitute. Electrical parameters are equivalent with the exception of forward voltage (950 mV @ 6 A, 50 mV higher than MR751). Reverse leakage is superior (10 µA @ 100 V). The R-6 package maintains through-hole axial mounting compatibility. Product status is Not For New Designs, limiting applicability to legacy system support. Operating temperature range (-55 to 125°C) is narrower than the MR751, excluding designs requiring operation below -55°C or above 125°C.

Both substitute parts carry REACH Unaffected and EAR99 ECCN classifications, matching the MR751 regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can the GI751-E3/54 directly replace the MR751 in existing designs?

A: The GI751-E3/54 satisfies all electrical parameters required for MR751 substitution. Physical package dimensions must be verified against PCB footprint specifications to confirm mechanical compatibility. The P600 package is a standard through-hole axial configuration; however, lead spacing and body diameter should be confirmed with the respective datasheets.

Q: What is the impact of the 50 mV forward voltage difference between the MR751 and 6A1-TP?

A: The 6A1-TP exhibits 950 mV forward voltage at 6 A compared to 900 mV for the MR751. This 50 mV difference results in increased power dissipation and heat generation in the diode. Circuit designs with tight thermal budgets or high-frequency switching applications should account for this additional dissipation.

Q: Are there temperature range limitations when substituting the MR751?

A: The MR751 operates from -65°C to 175°C. The GI751-E3/54 operates from -50°C to 150°C, and the 6A1-TP operates from -55°C to 125°C. Applications requiring operation below -50°C or above 150°C cannot use the GI751-E3/54. Applications requiring operation below -55°C or above 125°C cannot use the 6A1-TP. Verify application temperature requirements before part selection.

Q: What is the significance of the reverse leakage current differences?

A: The MR751 specifies 25 µA reverse leakage at 100 V. The GI751-E3/54 specifies 5 µA, and the 6A1-TP specifies 10 µA. Lower reverse leakage reduces standby current and improves circuit efficiency. Applications sensitive to leakage current benefit from the superior performance of the GI751-E3/54 and 6A1-TP.

Q: Why is the MR751 classified as obsolete?

A: Obsolete classification indicates the part is no longer manufactured by onsemi and is not available through standard distribution channels. Existing inventory may be available through secondary market suppliers. The GI751-E3/54 and 6A1-TP provide equivalent electrical functionality with current manufacturing support.

Q: Does RoHS compliance affect substitution decisions?

A: The MR751 is RoHS non-compliant. Both substitute parts (GI751-E3/54 and 6A1-TP) are ROHS3 compliant. Applications subject to RoHS regulations must use compliant substitutes. Legacy systems not subject to RoHS requirements may use any qualified substitute based on electrical and thermal criteria.

Q: What package considerations apply to MR751 substitution?

A: The MR751 uses a Microde Button package. Substitute parts use R-6 (6A1-TP) and P600 (GI751-E3/54) packages. All three are through-hole axial configurations. Physical lead spacing, body diameter, and mounting hole alignment must be verified against PCB design specifications. Consult manufacturer datasheets for precise dimensional data.