MUR440RL Equivalent & Substitute Parts

Part Overview

The MUR440RL is a general-purpose fast recovery rectifier diode rated for 400 V DC reverse voltage and 4 A average rectified current. Manufactured by onsemi in the SWITCHMODE™ series, this component is classified as obsolete. Due to its obsolete product status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and system maintenance. Substitute parts maintain electrical and mechanical compatibility while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	1.28 V @ 4 A
Reverse Recovery Time (trr)	75 ns
Current - Reverse Leakage @ Vr	10 µA @ 400 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole
Package / Case	DO-201AA, DO-27, Axial
Operating Temperature - Junction	-65°C ~ 175°C

Substitute Part Grouping Explanation

Substitute parts for the MUR440RL are classified into two categories based on electrical parameter alignment:

Direct Equivalents maintain identical electrical specifications across all critical parameters: 400 V reverse voltage, 4 A average rectified current, 1.28 V forward voltage at 4 A, 75 ns reverse recovery time, and 10 µA reverse leakage current. These parts are interchangeable at the circuit level with no performance deviation.

Similar Substitutes share the same 400 V reverse voltage rating and fast recovery speed classification but differ in current rating (5 A versus 4 A), forward voltage (1.3 V @ 5 A), reverse recovery time (50 ns), and reverse leakage current (5 µA @ 400 V). These parts are suitable for applications where the higher current capability and improved reverse recovery characteristics provide design margin, provided the circuit topology accommodates the different electrical characteristics.

Substitution eligibility is determined by:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Mounting Type: Through Hole
Package / Case: Axial compatible
Operating Temperature Range: -65°C minimum to 150°C minimum
Speed Classification: Fast Recovery

Parameter Comparison

Parameter	MUR440RL	MUR440RLG	MUR440-E3/54	HER505GP-AP	HER505GP-TP
Manufacturer	onsemi	onsemi	Vishay General Semiconductor - Diodes Division	Micro Commercial Co	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	4 A	4 A	4 A	5 A	5 A
Voltage - Forward (Vf) (Max) @ If	1.28 V @ 4 A	1.28 V @ 4 A	1.28 V @ 4 A	1.3 V @ 5 A	1.3 V @ 5 A
Reverse Recovery Time (trr)	75 ns	75 ns	75 ns	50 ns	50 ns
Current - Reverse Leakage @ Vr	10 µA @ 400 V	10 µA @ 400 V	10 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-201AA, DO-27, Axial	DO-201AA, DO-27, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Operating Temperature - Junction	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 150°C	-65°C ~ 150°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified

Engineering Selection Recommendations

Direct Equivalent Selection:

MUR440RLG and MUR440-E3/54 are direct electrical equivalents to the MUR440RL. Both parts maintain identical voltage, current, and recovery time specifications. MUR440RLG is manufactured by onsemi with ROHS3 compliance and active product status. MUR440-E3/54 is manufactured by Vishay General Semiconductor - Diodes Division with ROHS3 compliance and active product status. Both direct equivalents provide improved regulatory compliance compared to the obsolete MUR440RL.

Similar Substitute Selection:

HER505GP-AP and HER505GP-TP are similar substitutes manufactured by Micro Commercial Co. These parts share the 400 V reverse voltage rating and fast recovery speed classification. The 5 A current rating provides 25% additional current capacity compared to the 4 A MUR440RL. Reverse recovery time is improved to 50 ns, and reverse leakage current is reduced to 5 µA. Operating temperature range extends to -65°C but is limited to 150°C maximum junction temperature. These parts are suitable for applications where the enhanced electrical characteristics provide design margin and the lower maximum junction temperature is acceptable.

Compliance Considerations:

The MUR440RL is RoHS non-compliant. MUR440RLG and MUR440-E3/54 are ROHS3 compliant, making them preferred for applications subject to RoHS regulations. All substitute parts carry REACH Unaffected status and EAR99 export classification, matching the original part.

Frequently Asked Questions (FAQ)

Q: Can MUR440RLG be used as a direct replacement for MUR440RL?

A: Yes. MUR440RLG is a direct electrical equivalent with identical voltage (400 V), current (4 A), forward voltage (1.28 V @ 4 A), and reverse recovery time (75 ns) specifications. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant). Both parts use the same base product number MUR440 and are manufactured by onsemi.

Q: What is the difference between MUR440-E3/54 and MUR440RLG?

A: Both are direct electrical equivalents with identical electrical specifications. MUR440-E3/54 is manufactured by Vishay General Semiconductor - Diodes Division, while MUR440RLG is manufactured by onsemi. MUR440-E3/54 uses DO-201AD package designation, while MUR440RLG uses DO-201AA/DO-27 package designation. Both are ROHS3 compliant and active products.

Q: Can HER505GP-AP or HER505GP-TP replace MUR440RL in all applications?

A: HER505GP-AP and HER505GP-TP share the 400 V reverse voltage rating and fast recovery speed classification but differ in current rating (5 A versus 4 A), forward voltage (1.3 V @ 5 A versus 1.28 V @ 4 A), reverse recovery time (50 ns versus 75 ns), and maximum junction temperature (150°C versus 175°C). These parts are suitable for applications where the higher current capability and improved reverse recovery characteristics are beneficial and the lower maximum junction temperature is acceptable.

Q: What are the package compatibility considerations?

A: MUR440RL, MUR440RLG, and MUR440-E3/54 are all through-hole axial mount diodes. MUR440RL and MUR440RLG use DO-201AA or DO-27 package designations. MUR440-E3/54, HER505GP-AP, and HER505GP-TP use DO-201AD package designation. All parts are physically compatible with standard through-hole axial diode footprints, though specific PCB layout should be verified for the selected package variant.

Q: Are there inventory considerations for substitute selection?

A: MUR440RL has 1003 pieces in stock. MUR440RLG has 1347 pieces in stock. MUR440-E3/54 has 3941 pieces in stock. HER505GP-AP has 916 pieces in stock. HER505GP-TP has 819 pieces in stock. Inventory levels should be evaluated based on production volume and supply chain requirements.

Q: What compliance certifications apply to all substitute parts?

A: All parts carry REACH Unaffected status and EAR99 export classification. MUR440RLG and MUR440-E3/54 are ROHS3 compliant. The original MUR440RL is RoHS non-compliant. Compliance requirements should be evaluated based on end-application regulatory obligations.

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