MR754 Equivalent & Substitute Parts

Part Overview

The MR754 is a general-purpose rectifier diode rated for 400 V DC reverse voltage and 6 A average rectified current, manufactured by onsemi in a Through Hole Microde Button package. This component is classified as obsolete, indicating it is no longer in active production. Locating functionally equivalent substitute parts is necessary to support ongoing maintenance, repair, and legacy system requirements where the original MR754 specification must be maintained.

Substiute Parts

MR754

onsemiIn Stock: 851MR754 Datasheet

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6A4-TP

Micro Commercial CoIn Stock: 128516A4-TP Datasheet

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GI754-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 27167GI754-E3/54 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MR754 are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

• Voltage Rating: All substitutes must maintain 400 V DC reverse voltage (Vr) maximum
• Current Rating: All substitutes must support 6 A average rectified current (Io)
• Forward Voltage: Substitutes must operate within acceptable forward voltage drop at rated current
• Recovery Speed: All substitutes must meet or exceed standard recovery specifications
• Mounting Type: All substitutes must be Through Hole configuration to ensure mechanical compatibility
• Reverse Leakage: Substitutes must maintain acceptable reverse leakage characteristics at rated voltage

The identified substitute parts—6A4-TP (Micro Commercial Co) and GI754-E3/54 (Vishay General Semiconductor - Diodes Division)—meet these core electrical requirements and provide direct functional equivalence for the obsolete MR754.

Parameter Comparison

Engineering Selection Recommendations

GI754-E3/54 (Vishay General Semiconductor - Diodes Division) is the primary recommended substitute for the MR754. This part is currently in Active product status, ensuring long-term availability and supply chain stability. The GI754-E3/54 is ROHS3 compliant, meeting modern regulatory requirements. Electrical parameters are identical to the MR754 for forward voltage (900 mV @ 6 A) and reverse voltage (400 V), with superior reverse leakage performance (5 µA versus 25 µA). The operating temperature range (-50°C ~ 150°C) covers the majority of industrial applications, though it does not extend to the full -65°C lower limit of the original MR754.

6A4-TP (Micro Commercial Co) serves as a secondary substitute option. This part is classified as Not For New Designs, indicating limited future availability. The 6A4-TP maintains full electrical compatibility with 400 V reverse voltage and 6 A current rating. Forward voltage is slightly elevated at 950 mV @ 6 A compared to the MR754 specification of 900 mV @ 6 A. The operating temperature range (-55°C ~ 125°C) is more restricted than both the MR754 and GI754-E3/54. The 6A4-TP is ROHS3 compliant.

For applications requiring the full -65°C lower operating temperature limit of the original MR754, neither substitute provides complete thermal coverage. System thermal analysis is required to confirm whether the reduced lower temperature limit of the substitutes is acceptable for the intended application.

Frequently Asked Questions (FAQ)

Q: Can the GI754-E3/54 directly replace the MR754 in existing designs?

A: The GI754-E3/54 provides electrical equivalence for the core rectification function. Both parts share identical 400 V reverse voltage, 6 A current rating, and 900 mV forward voltage at rated current. Both are Through Hole mounted devices. The primary consideration is the operating temperature range: the GI754-E3/54 operates from -50°C to 150°C, while the MR754 extends to -65°C. If the application does not require operation below -50°C junction temperature, direct substitution is valid.

Q: What is the significance of the forward voltage difference between the MR754 and 6A4-TP?

A: The MR754 specifies 900 mV forward voltage at 6 A, while the 6A4-TP specifies 950 mV at the same current. This 50 mV difference represents approximately 5.6% higher voltage drop in the 6A4-TP. In power supply and rectification circuits, this increased drop results in higher power dissipation and heat generation. Circuit thermal design must account for this additional dissipation if the 6A4-TP is selected.

Q: Are the package types interchangeable between MR754, 6A4-TP, and GI754-E3/54?

A: All three parts are Through Hole axial-lead devices, but they use different physical package designations: MR754 uses Microde Button, 6A4-TP uses R-6, and GI754-E3/54 uses P600. While all are Through Hole mounted, the physical dimensions and lead spacing differ. PCB layout and mechanical clearances must be verified before substitution. Consult manufacturer datasheets for precise dimensional specifications.

Q: Why is the reverse leakage current lower in the substitute parts?

A: The MR754 specifies 25 µA reverse leakage at 400 V, while the GI754-E3/54 specifies 5 µA and the 6A4-TP specifies 10 µA at the same voltage. Lower reverse leakage indicates improved semiconductor material quality and manufacturing processes in the newer parts. This is a beneficial characteristic that does not affect substitution compatibility; circuits designed for the higher leakage of the MR754 will operate correctly with lower-leakage substitutes.

Q: What is the impact of RoHS compliance on substitution decisions?

A: The MR754 is RoHS non-compliant, while both substitute parts (6A4-TP and GI754-E3/54) are ROHS3 compliant. For new equipment designs or systems subject to RoHS regulations, the compliant substitutes are required. For legacy system repair and maintenance where RoHS compliance is not mandated, either the original MR754 or compliant substitutes may be used based on availability and application requirements.

Q: Which substitute part should be selected for new designs?

A: The GI754-E3/54 is the appropriate choice for new designs. It maintains Active product status, ensuring continued availability and manufacturer support. The 6A4-TP is designated Not For New Designs, indicating the manufacturer does not recommend its use in new applications. For legacy system support where the MR754 is no longer available, the GI754-E3/54 provides the most reliable long-term substitute.