MR754RL Equivalent & Substitute Parts

Part Overview

The MR754RL is a general-purpose rectifier diode manufactured by onsemi, rated for 400 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. This part is classified as obsolete, necessitating identification of equivalent alternatives for ongoing applications and new designs. Substitute parts must maintain electrical performance within the specified voltage and current parameters while accommodating packaging and compliance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	6	A
Voltage - Forward (Vf) (Max) @ If	900	mV @ 6 A
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	25	µA @ 400 V
Mounting Type	Through Hole	—
Operating Temperature - Junction	-65 to 175	°C
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MR754RL is determined by strict equivalence in the following electrical parameters: maximum DC reverse voltage (400 V), average rectified current (6 A), forward voltage drop at rated current, recovery speed classification, and reverse leakage current. All substitute parts must maintain through-hole axial mounting to ensure mechanical compatibility with existing PCB layouts. The substitution logic prioritizes parts that meet or exceed the original electrical specifications while accommodating different physical package formats (R-6 and P600 packages are acceptable alternatives to the Microde Button package).

Key parameters governing substitution:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 6 A minimum
Mounting Type: Through Hole (axial configuration)
Recovery Speed: Standard Recovery classification
Operating Temperature Range: Must support application requirements

Parameter Comparison

Parameter	MR754RL (onsemi)	6A4-TP (Micro Commercial Co)	GI754-E3/54 (Vishay)
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 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 @ 400 V	10 µA @ 400 V	5 µA @ 400 V
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Button, Axial	R-6, Axial	P600, Axial
Operating Temperature - Junction	-65°C ~ 175°C	-55°C ~ 125°C	-50°C ~ 150°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Not For New Designs	Active

Engineering Selection Recommendations

GI754-E3/54 (Vishay General Semiconductor - Diodes Division) is the primary substitute for the MR754RL. This part maintains identical electrical specifications (400 V, 6 A, 900 mV forward voltage) and meets all core substitution criteria. The GI754-E3/54 carries Active product status and ROHS3 compliance, making it suitable for new designs and long-term availability. The P600 package is mechanically compatible with through-hole PCB layouts. Reverse leakage current is superior at 5 µA compared to the original 25 µA specification.

6A4-TP (Micro Commercial Co) serves as a secondary substitute when GI754-E3/54 is unavailable. This part meets all electrical requirements with 400 V reverse voltage and 6 A current rating. The forward voltage is slightly elevated at 950 mV, which remains within acceptable tolerance for most applications. The R-6 package accommodates through-hole mounting. However, this part carries "Not For New Designs" status, limiting its application to legacy system maintenance. Operating temperature range (-55°C to 125°C) is narrower than the original specification.

Selection between substitute parts depends on application requirements: GI754-E3/54 is preferred for new designs and applications requiring extended temperature operation; 6A4-TP is acceptable for existing systems where component availability is constrained and temperature range requirements are within -55°C to 125°C.

Frequently Asked Questions (FAQ)

Q: Can the GI754-E3/54 directly replace the MR754RL without PCB modification?

A: The GI754-E3/54 maintains identical electrical specifications and through-hole axial mounting. Physical package dimensions differ (P600 versus Microde Button), requiring verification of PCB hole spacing and lead length compatibility. Electrical substitution is direct; mechanical fit must be confirmed for the specific application.

Q: What is the significance of the forward voltage difference between MR754RL (900 mV) and 6A4-TP (950 mV)?

A: The 50 mV difference represents a 5.6% increase in forward voltage drop. In rectifier applications, this translates to marginally higher power dissipation and heat generation. For most general-purpose rectification circuits, this difference is negligible. Applications with tight thermal budgets or high-frequency switching should prioritize GI754-E3/54, which matches the original 900 mV specification.

Q: Why does the MR754RL have higher reverse leakage current (25 µA) compared to substitutes?

A: Reverse leakage current is a function of semiconductor manufacturing process and device age. The MR754RL, being obsolete, reflects older manufacturing technology. Substitute parts (GI754-E3/54 at 5 µA, 6A4-TP at 10 µA) incorporate modern process improvements resulting in lower leakage. Lower leakage current improves efficiency and reduces standby power consumption in DC applications.

Q: Is the operating temperature range difference between MR754RL (-65°C to 175°C) and 6A4-TP (-55°C to 125°C) critical?

A: Temperature range differences are application-dependent. If the circuit operates within -55°C to 125°C, the 6A4-TP is fully qualified. Applications requiring extended low-temperature operation below -55°C or high-temperature operation above 125°C must use GI754-E3/54 (-50°C to 150°C) or retain the original MR754RL. Verify actual operating conditions before selecting a substitute based on temperature range alone.

Q: What does "Not For New Designs" status mean for the 6A4-TP?

A: This designation indicates the manufacturer does not recommend the 6A4-TP for new product development. The part remains available for legacy system support and maintenance. For new designs, GI754-E3/54 with Active status is the appropriate choice, ensuring long-term supply continuity and manufacturer support.

Q: Are the R-6 and P600 packages mechanically interchangeable with the Microde Button package?

A: All three packages are through-hole axial configurations with two leads. Physical dimensions and lead spacing differ. PCB hole diameter and spacing must accommodate the specific package. Lead length may vary, affecting insertion depth and solder joint formation. Mechanical compatibility must be verified against PCB design specifications before substitution.

Q: Does RoHS compliance affect electrical performance or substitution suitability?

A: RoHS compliance addresses material composition (lead-free solder, restricted substances) rather than electrical performance. The MR754RL is RoHS non-compliant; both substitutes are ROHS3 compliant. For applications subject to RoHS regulations or environmental requirements, GI754-E3/54 or 6A4-TP must be selected. Electrical performance is unaffected by RoHS status.

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