MR751RLG Equivalent & Substitute Parts

Part Overview

The MR751RLG 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 configuration with standard recovery characteristics. The MR751RLG is classified as Obsolete, indicating it is no longer in active production. Identification of equivalent substitute parts is necessary to maintain design continuity and ensure component availability for repair, maintenance, and legacy system support.

Substiute Parts

MR751RLG

onsemiIn Stock: 1208MR751RLG 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 MR751RLG 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: 900 mV or lower at 6 A
• Speed: Standard Recovery >500ns, > 200mA (Io)
• Technology: Standard

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: Axial configuration

Environmental & Compliance Criteria:

• Operating Temperature - Junction: Range must encompass or exceed the application requirements
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected
• ECCN: EAR99

The substitute parts 6A1-TP and GI751-E3/54 meet or exceed the electrical specifications of the MR751RLG while maintaining Through Hole Axial mounting compatibility. Both substitutes are classified as Standard technology rectifier diodes with equivalent or superior reverse voltage and forward current ratings.

Parameter Comparison

Engineering Selection Recommendations

GI751-E3/54 (Vishay General Semiconductor - Diodes Division) is the primary substitute for the MR751RLG. This part is classified as Active product status, ensuring ongoing availability and manufacturing support. The GI751-E3/54 meets all electrical specifications of the MR751RLG with identical reverse voltage (100 V) and forward current (6 A) ratings. Forward voltage is equivalent at 900 mV @ 6 A. Reverse leakage current is superior at 5 µA @ 100 V compared to 25 µA @ 100 V for the original part. The device maintains ROHS3 compliance and REACH Unaffected status. Operating temperature range is -50°C ~ 150°C, which covers most standard industrial applications. The P600 package is a standard Through Hole Axial configuration compatible with legacy PCB layouts designed for the MR751RLG.

6A1-TP (Micro Commercial Co) is a secondary substitute option. This part is classified as Not For New Designs, indicating limited future availability. The 6A1-TP meets all electrical specifications with 100 V reverse voltage and 6 A forward current. Forward voltage is slightly elevated at 950 mV @ 6 A. Reverse leakage current is 10 µA @ 100 V, which is superior to the original part. Operating temperature range is -55°C ~ 125°C, which is narrower than the MR751RLG. The R-6 package is a Through Hole Axial configuration. ROHS3 compliance and REACH Unaffected status are maintained.

For new designs and long-term production support, GI751-E3/54 is the recommended substitute. For legacy system maintenance where component availability is critical, 6A1-TP provides an alternative option with equivalent electrical performance.

Frequently Asked Questions (FAQ)

Q: Can the GI751-E3/54 directly replace the MR751RLG in existing designs?

A: Yes. The GI751-E3/54 meets all electrical specifications of the MR751RLG with identical reverse voltage (100 V) and forward current (6 A) ratings. Both devices are Through Hole Axial configuration rectifier diodes. Physical package dimensions may differ between the Microde Button (MR751RLG) and P600 (GI751-E3/54) packages; PCB layout verification is required to confirm mechanical fit.

Q: What is the difference between the 6A1-TP and GI751-E3/54 substitutes?

A: Both parts meet the electrical specifications of the MR751RLG. The GI751-E3/54 is classified as Active product status with ongoing manufacturing support, while the 6A1-TP is classified as Not For New Designs with limited future availability. The GI751-E3/54 has a wider operating temperature range (-50°C ~ 150°C vs. -55°C ~ 125°C) and lower reverse leakage current (5 µA vs. 10 µA @ 100 V). For long-term applications, GI751-E3/54 is the preferred choice.

Q: Are there package compatibility concerns when substituting the MR751RLG?

A: Yes. The MR751RLG uses a Microde Button package, while the substitute parts use different Through Hole Axial packages (R-6 for 6A1-TP and P600 for GI751-E3/54). All three are Through Hole Axial configurations, but physical dimensions and lead spacing may differ. PCB layout and mechanical clearance must be verified before component substitution.

Q: What is the operating temperature range difference between the MR751RLG and its substitutes?

A: The MR751RLG operates from -65°C ~ 175°C. The GI751-E3/54 operates from -50°C ~ 150°C, and the 6A1-TP operates from -55°C ~ 125°C. For applications requiring the full temperature range of the original part, neither substitute covers the complete range. Application temperature requirements must be evaluated against substitute specifications.

Q: Are all three parts RoHS and REACH compliant?

A: The GI751-E3/54 and 6A1-TP are ROHS3 compliant. The MR751RLG does not specify RoHS status. All three parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: What is the significance of the "Not For New Designs" status of the 6A1-TP?

A: This classification indicates that the 6A1-TP is in limited production and not recommended for new product designs. While the part is currently available, future availability cannot be guaranteed. For new designs and long-term production, the GI751-E3/54 (Active status) is the appropriate choice.

Q: How do reverse leakage currents compare between the three parts?

A: The MR751RLG has reverse leakage of 25 µA @ 100 V. The GI751-E3/54 has 5 µA @ 100 V, and the 6A1-TP has 10 µA @ 100 V. Both substitutes have lower reverse leakage, which may improve circuit performance in applications sensitive to leakage current.