MR751-BP Equivalent & Substitute Parts

Part Overview

The MR751-BP is a general-purpose rectifier diode rated for 100 V DC reverse voltage and 6 A average rectified current, manufactured by Micro Commercial Co in a leaded button package for through-hole mounting. The product status is listed as obsolete, necessitating identification of functionally equivalent alternatives for ongoing production and repair applications. Substitute parts must maintain electrical performance across voltage, current, and thermal specifications while accommodating different package configurations.

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°C ~ 175°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MR751-BP is determined by equivalence in the following electrical parameters: maximum reverse voltage (100 V), average rectified current (6 A), forward voltage drop characteristics, reverse recovery speed classification, and reverse leakage current. All substitute parts listed maintain these core electrical specifications within acceptable engineering tolerances.

Package configuration differences (button, DO-201AD, R-6) are secondary considerations; all substitute parts retain through-hole axial mounting compatibility. Operating temperature ranges vary among substitutes; selection must account for application thermal requirements. Reverse leakage current values differ across substitutes but remain within standard rectifier performance bands.

All substitute parts carry ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the original part's regulatory status.

Parameter Comparison

Parameter	MR751-BP	60S1-TP	6A1-TP	6A01-G	6A01B-G
Manufacturer	Micro Commercial Co	Micro Commercial Co	Micro Commercial Co	Comchip Technology	Comchip Technology
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	6 A	6 A	6 A	6 A	6 A
Voltage - Forward (Vf) (Max) @ If	900 mV @ 6 A	1 V @ 6 A	950 mV @ 6 A	1 V @ 6 A	1 V @ 6 A
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	25 µA @ 100 V	5 µA @ 100 V	10 µA @ 100 V	10 µA @ 100 V	10 µA @ 100 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Button, Axial	DO-201AD, Axial	R-6, Axial	R-6, Axial	R-6, Axial
Operating Temperature - Junction	-65°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Not For New Designs	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production Applications:

The 6A01-G (Comchip Technology) and 6A01B-G (Comchip Technology) are the preferred substitutes, both carrying active product status. These parts maintain full electrical equivalence at 100 V, 6 A ratings with standard recovery characteristics. The 6A01-G is supplied in cut tape packaging, while 6A01B-G is supplied in bulk. Both operate across -55°C to 125°C junction temperature range and carry ROHS3 compliance.

For Repair and Legacy System Support:

The 60S1-TP (Micro Commercial Co) and 6A1-TP (Micro Commercial Co) provide functional substitution with "Not For New Designs" status. The 60S1-TP offers superior reverse leakage performance (5 µA) and extended temperature range to 150°C in DO-201AD package. The 6A1-TP provides intermediate specifications in R-6 package with 10 µA reverse leakage.

Temperature Considerations:

Applications requiring operation above 125°C junction temperature should prioritize 60S1-TP (150°C maximum) or evaluate thermal management modifications. The original MR751-BP specification of -65°C to 175°C is not matched by any substitute; applications with lower temperature limits (-55°C minimum) are compatible with all listed substitutes.

Package Accommodation:

PCB layout modifications are required when substituting from button package to DO-201AD or R-6 packages. All packages maintain axial through-hole mounting compatibility.

Frequently Asked Questions (FAQ)

Q: Can 6A01-G directly replace MR751-BP without circuit modification?

A: Electrical substitution is valid. The 6A01-G maintains 100 V reverse voltage and 6 A current ratings with equivalent forward voltage and recovery speed. Package geometry differs (R-6 versus button); PCB footprint modification is required.

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

A: The MR751-BP specifies 25 µA reverse leakage at 100 V, while substitutes range from 5 µA to 10 µA. Lower leakage improves efficiency in high-impedance circuits. For standard rectification applications, these differences are not functionally significant.

Q: Why do substitute parts show "Not For New Designs" status?

A: This designation indicates manufacturer discontinuation plans. Parts remain functionally available but are not recommended for new product development. Active-status alternatives (6A01-G, 6A01B-G) are preferred for new designs.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance matching the original MR751-BP specification.

Q: What is the impact of operating temperature range reduction?

A: The MR751-BP operates to 175°C junction temperature. Substitutes operate to 125°C or 150°C maximum. Applications requiring sustained operation above 125°C require thermal analysis or alternative component selection.

Q: Can 60S1-TP be used in applications requiring the full -65°C to 175°C range?

A: No. The 60S1-TP operates -55°C to 150°C. Applications requiring -65°C minimum temperature or 175°C maximum temperature cannot use this substitute without design modification.

Q: What packaging format should be selected for automated assembly?

A: The 6A01-G supplied in cut tape (CT) packaging is suitable for automated pick-and-place assembly. The 6A01B-G in bulk packaging requires manual handling or tape-and-reel conversion.

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