MR751G Equivalent & Substitute Parts

Part Overview

The MR751G 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 and operates across a junction temperature range of -65°C to 175°C. This part is classified as obsolete, making identification of equivalent substitute components necessary for ongoing design support, maintenance, and production continuity. The MR751G serves applications requiring standard recovery rectification in power supply and conversion circuits.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	6	A
Voltage - Forward (Vf) (Max) @ If	900 mV @ 6 A	mV
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	25	µA @ 100 V
Mounting Type	Through Hole	—
Operating Temperature - Junction	-65 to 175	°C
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the MR751G is determined by electrical and mechanical parameter alignment within the general-purpose rectifier diode category. The critical parameters governing substitution are:

Electrical Parameters:

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 Classification: Standard Recovery >500ns, > 200mA (Io)

Mechanical Parameters:

Mounting Type: Through Hole
Package Category: Axial configuration

The substitute part GI751-E3/54 meets all critical electrical specifications and maintains through-hole axial mounting compatibility. Both parts operate within the standard recovery speed classification and share identical voltage and current ratings. The substitute part is classified as active product status with current manufacturing availability.

Parameter Comparison

Parameter	MR751G (onsemi)	GI751-E3/54 (Vishay)	Match Status
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	Equivalent
Current - Average Rectified (Io)	6 A	6 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	900 mV @ 6 A	900 mV @ 6 A	Equivalent
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Equivalent
Current - Reverse Leakage @ Vr	25 µA @ 100 V	5 µA @ 100 V	Substitute Superior
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	Button, Axial	P600, Axial	Compatible
Operating Temperature - Junction	-65°C ~ 175°C	-50°C ~ 150°C	Substitute Reduced Range
Product Status	Obsolete	Active	Substitute Active
RoHS Status	Not specified	ROHS3 Compliant	Substitute Compliant

Engineering Selection Recommendations

The GI751-E3/54 manufactured by Vishay General Semiconductor - Diodes Division is a direct electrical substitute for the obsolete MR751G. Both devices share identical voltage ratings (100 V), current ratings (6 A), forward voltage characteristics (900 mV @ 6 A), and speed classification (Standard Recovery >500ns, > 200mA).

The GI751-E3/54 offers the following advantages:

Active Product Status: Currently manufactured and widely available (21,923 pcs in stock), ensuring supply chain continuity
Improved Reverse Leakage: 5 µA @ 100 V compared to 25 µA @ 100 V, resulting in lower standby current
RoHS3 Compliance: Meets modern environmental and regulatory requirements
Axial Through-Hole Mounting: Maintains mechanical compatibility with existing PCB layouts

Operating Temperature Consideration: The GI751-E3/54 operates across -50°C to 150°C, compared to the MR751G range of -65°C to 175°C. Applications requiring operation below -50°C or above 150°C require thermal analysis to confirm suitability.

Both parts carry identical REACH Unaffected and EAR99 ECCN classifications, confirming regulatory equivalence.

Frequently Asked Questions (FAQ)

Q: Can the GI751-E3/54 directly replace the MR751G in existing designs?

A: Yes. The GI751-E3/54 meets all critical electrical specifications: 100 V reverse voltage, 6 A average rectified current, 900 mV forward voltage at 6 A, and standard recovery speed classification. Both devices use through-hole axial mounting, ensuring PCB layout compatibility.

Q: What is the difference between the Microde Button and P600 packages?

A: Both are through-hole axial packages designed for similar applications. The Microde Button (MR751G) and P600 (GI751-E3/54) differ in physical form factor but maintain electrical equivalence and mounting compatibility on standard through-hole PCBs.

Q: Does the lower reverse leakage current of the GI751-E3/54 affect circuit performance?

A: The GI751-E3/54 exhibits 5 µA reverse leakage compared to 25 µA in the MR751G. This improvement reduces standby power consumption and heat generation, particularly in high-voltage or high-temperature applications. No circuit redesign is required.

Q: Are there temperature range limitations when substituting the GI751-E3/54?

A: The GI751-E3/54 operates from -50°C to 150°C junction temperature, compared to the MR751G range of -65°C to 175°C. Applications requiring operation outside the -50°C to 150°C window require thermal verification to confirm the substitute part remains within specified operating limits.

Q: Is the GI751-E3/54 RoHS compliant?

A: Yes. The GI751-E3/54 is ROHS3 compliant, meeting current environmental regulations. The MR751G RoHS status is not specified in available documentation.

Q: What is the inventory status of the substitute part?

A: The GI751-E3/54 is actively manufactured with 21,923 pieces in current stock, ensuring reliable supply availability for production and maintenance applications.

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