MUR440 Equivalent & Substitute Parts

Part Overview

The MUR440 is a superfast recovery rectifier diode manufactured by onsemi, rated for 400 V DC reverse voltage and 4 A average rectified current in a DO-201AA/DO-27 axial through-hole package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with compatible or superior ratings within the same package family.

Key Parameters

Parameter	Value	Unit
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 to 175	°C

Substitute Part Grouping Explanation

Substitution eligibility for the MUR440 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum DC reverse voltage rating of 400 V to ensure circuit protection and reliability.

Current Rating: Substitute parts must support a minimum average rectified current of 4 A. Parts with higher current ratings (5 A) are acceptable as they provide design margin.

Package Compatibility: All substitute parts must use through-hole axial mounting in the DO-201 family (DO-201AA, DO-201AD) to ensure mechanical and electrical compatibility with existing PCB layouts.

Recovery Characteristics: Substitute parts must maintain fast recovery classification (≤ 500ns for currents > 200mA) to preserve circuit switching performance.

Operating Temperature Range: Substitute parts must support the minimum junction temperature range of -65°C to 150°C. The original part's upper limit of 175°C is not required for substitution.

The MUR440-E3/54 qualifies as a direct equivalent with identical electrical specifications and active product status. The HER505GP-TP and HER505GP-AP variants are classified as similar substitutes with higher current ratings (5 A) and improved reverse recovery time (50 ns), suitable for applications requiring enhanced performance margins.

Parameter Comparison

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

Engineering Selection Recommendations

MUR440-E3/54 (Direct Equivalent): This part is the primary substitute for the obsolete MUR440. It maintains identical electrical specifications including voltage rating, current capacity, forward voltage drop, and reverse recovery time. The MUR440-E3/54 is manufactured by Vishay General Semiconductor and carries active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The DO-201AD package is mechanically compatible with the original DO-201AA specification for through-hole axial mounting.

HER505GP-TP and HER505GP-AP (Similar Substitutes): These Micro Commercial Co parts provide enhanced performance characteristics with 5 A current rating and 50 ns reverse recovery time compared to the original 4 A and 75 ns specifications. Both maintain the 400 V voltage rating and fast recovery classification. These parts are suitable for applications where improved switching performance and current margin are beneficial. Both variants use the DO-201AD package and are available in active product status. Selection between TP and AP variants depends on packaging requirements (both listed as Bulk).

Compliance Considerations: The MUR440-E3/54 offers ROHS3 compliance, addressing regulatory requirements for new designs. The original MUR440 is RoHS non-compliant, making the compliant substitute preferable for applications subject to environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can the MUR440-E3/54 be used as a direct replacement for the MUR440?

A: Yes. The MUR440-E3/54 maintains identical electrical specifications including 400 V reverse voltage, 4 A current rating, 1.28 V forward voltage drop, and 75 ns reverse recovery time. The DO-201AD package is mechanically compatible with the original DO-201AA for through-hole axial mounting applications.

Q: What is the difference between the MUR440-E3/54 and the HER505GP variants?

A: The MUR440-E3/54 is a direct electrical equivalent with matching 4 A current rating and 75 ns recovery time. The HER505GP-TP and HER505GP-AP are similar substitutes with higher 5 A current ratings and faster 50 ns recovery times. All three maintain the 400 V voltage rating and fast recovery classification.

Q: Are the HER505GP-TP and HER505GP-AP interchangeable?

A: Both parts have identical electrical specifications. The difference lies in packaging designation (TP versus AP), which reflects supplier packaging format. Electrical performance and compatibility are equivalent.

Q: Will the higher current rating of the HER505GP parts affect circuit operation?

A: No. A higher current rating provides design margin and does not negatively affect circuit operation. The 5 A rating ensures the part can handle the 4 A requirement with additional capacity.

Q: Is the improved reverse recovery time of the HER505GP parts beneficial?

A: Yes. The 50 ns recovery time of the HER505GP parts is faster than the original 75 ns specification, resulting in reduced switching losses and improved efficiency in high-frequency applications.

Q: What are the package compatibility considerations?

A: All substitute parts use DO-201AD axial through-hole packages, which are mechanically compatible with the original DO-201AA specification. Both package variants fit standard through-hole PCB layouts designed for axial diodes.

Q: Does the operating temperature range affect substitution?

A: The HER505GP variants operate to 150°C maximum junction temperature, compared to the original 175°C specification. This is acceptable for most applications. If operation above 150°C is required, the MUR440-E3/54 maintains the original 175°C upper limit.

Q: What is the inventory status of these substitute parts?

A: MUR440-E3/54 has 3,941 pieces in stock. HER505GP-TP has 819 pieces in stock. HER505GP-AP has 916 pieces in stock. All are available as new original components.

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