MR756 Equivalent & Substitute Parts

Part Overview

The MR756 is a general-purpose rectifier diode manufactured by onsemi, rated for 600 V DC reverse voltage and 6 A average rectified current. The device features a Microde Button package with through-hole mounting and operates across a junction temperature range of -65°C to 175°C. The MR756 is classified as obsolete, necessitating identification of equivalent substitute components for ongoing applications and new designs. Substitute parts must maintain electrical performance within the specified voltage and current ratings while accommodating packaging and compliance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	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 @ 600 V
Mounting Type	Through Hole	—
Operating Temperature - Junction	-65°C to 175°C	°C
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitute parts for the MR756 are selected based on strict electrical and mechanical compatibility criteria. All substitute components must meet or exceed the following parameters:

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 6 A minimum
Mounting Type: Through Hole
Recovery Speed: Standard Recovery >500ns, > 200mA (Io)
Package Type: Axial configuration

The identified substitute parts—6A6-TP (Micro Commercial Co) and GI756-E3/54 (Vishay General Semiconductor - Diodes Division)—satisfy these electrical requirements. Both components are rated for 600 V reverse voltage and 6 A average rectified current with standard recovery characteristics. Physical package differences exist between the original Microde Button and substitute R-6 and P600 packages; however, all maintain through-hole axial mounting compatibility for circuit board integration.

Parameter Comparison

Parameter	MR756 (onsemi)	6A6-TP (Micro Commercial Co)	GI756-E3/54 (Vishay)
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V
Current - Average Rectified (Io)	6 A	6 A	6 A
Voltage - Forward (Vf) (Max) @ If	900 mV @ 6 A	950 mV @ 6 A	900 mV @ 6 A
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	25 µA @ 600 V	10 µA @ 600 V	5 µA @ 600 V
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Button, Axial	R-6, Axial	P600, Axial
Operating Temperature - Junction	-65°C to 175°C	-55°C to 125°C	-50°C to 150°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Not For New Designs	Active

Engineering Selection Recommendations

GI756-E3/54 (Vishay General Semiconductor - Diodes Division) is the primary substitute for the MR756. This component is classified as Active, indicating ongoing manufacturer support and availability. The GI756-E3/54 meets all electrical specifications with identical 600 V reverse voltage and 6 A current ratings, matching the forward voltage characteristic at 900 mV @ 6 A. The device demonstrates superior reverse leakage performance at 5 µA @ 600 V compared to the original 25 µA specification. RoHS3 compliance status provides regulatory alignment for modern applications. Operating temperature range of -50°C to 150°C covers the majority of industrial applications, though the original MR756 extends to -65°C and 175°C.

6A6-TP (Micro Commercial Co) serves as a secondary substitute option. This component is classified as Not For New Designs, indicating limited future availability and manufacturer support. The 6A6-TP maintains electrical compatibility with 600 V reverse voltage and 6 A current ratings; however, forward voltage is specified at 950 mV @ 6 A, representing a 50 mV increase over the MR756. Reverse leakage performance is 10 µA @ 600 V, intermediate between the original and primary substitute. Operating temperature range of -55°C to 125°C is more restrictive than both the original and primary substitute. RoHS3 compliance is achieved.

For new designs and long-term applications, GI756-E3/54 is the recommended selection. For legacy system maintenance where component availability is critical, 6A6-TP provides functional equivalence with acknowledged design status limitations.

Frequently Asked Questions (FAQ)

Q: Can the GI756-E3/54 directly replace the MR756 in existing circuits?

A: The GI756-E3/54 meets all electrical specifications for direct substitution. Voltage ratings (600 V), current capacity (6 A), and recovery characteristics are identical. Physical package differences exist (P600 versus Microde Button); however, both employ through-hole axial mounting. Circuit board layout modifications may be required to accommodate the different package geometry.

Q: What is the significance of the reverse leakage current difference between MR756 (25 µA) and GI756-E3/54 (5 µA)?

A: Lower reverse leakage current in the GI756-E3/54 indicates reduced parasitic current flow when the diode is reverse-biased. This characteristic improves circuit efficiency and reduces heat generation in high-impedance applications. The difference is not detrimental to substitution; rather, it represents improved performance.

Q: Why is the MR756 classified as obsolete?

A: Obsolete classification indicates the manufacturer has discontinued production and no longer provides technical support or warranty coverage. Substitute parts ensure continued availability and access to active manufacturer support for applications requiring this diode specification.

Q: Are there temperature range limitations when substituting the MR756 with GI756-E3/54?

A: The GI756-E3/54 operates from -50°C to 150°C, compared to the MR756 range of -65°C to 175°C. Applications requiring operation below -50°C or above 150°C require evaluation against the GI756-E3/54 thermal specifications. Most industrial and commercial applications operate within the GI756-E3/54 temperature envelope.

Q: What is the difference between RoHS non-compliant (MR756) and ROHS3 compliant (GI756-E3/54)?

A: RoHS3 compliance indicates the substitute part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original MR756 predates these regulations. For applications subject to environmental or procurement regulations, ROHS3-compliant substitutes are required.

Q: Can the 6A6-TP be used instead of the GI756-E3/54?

A: The 6A6-TP provides functional equivalence with identical voltage and current ratings. However, the component is classified as Not For New Designs, indicating limited future availability. The GI756-E3/54 is preferred due to Active status and superior long-term support. The 6A6-TP is suitable for legacy system maintenance where component availability is the primary constraint.

Q: How do package differences affect circuit board design?

A: The MR756 uses a Microde Button package, while substitutes employ R-6 (6A6-TP) or P600 (GI756-E3/54) packages. All maintain through-hole axial mounting; however, physical dimensions and lead spacing differ. Circuit board layout must accommodate the substitute package geometry. Mechanical fit verification is required before production implementation.

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