MUR440G Equivalent & Substitute Parts

Part Overview

The MUR440G is a general-purpose rectifier diode rated for 400 V DC reverse voltage and 4 A average rectified current, manufactured by onsemi in the SWITCHMODE™ series. This component features fast recovery characteristics with a reverse recovery time of 75 ns and is housed in a DO-201AA/DO-27 axial through-hole package. The MUR440G is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging options.

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)	—
Operating Temperature - Junction	-65 to 175	°C
Mounting Type	Through Hole	—
Package / Case	DO-201AA, DO-27, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the MUR440G are classified into two categories based on electrical parameter alignment:

Direct Substitutes (Identical Electrical Specifications): Direct substitutes maintain all critical electrical parameters: 400 V reverse voltage rating, 4 A average rectified current, 1.28 V forward voltage drop at 4 A, 75 ns reverse recovery time, and 10 µA reverse leakage current at 400 V. These parts are functionally interchangeable within the same circuit application. Package variations (DO-201AD vs. DO-201AA) are mechanically compatible in standard through-hole mounting configurations.

Similar Substitutes (Relaxed Current or Recovery Parameters): Similar substitutes maintain the 400 V reverse voltage rating and fast recovery speed classification but differ in average rectified current capacity or reverse recovery time. These parts are suitable for applications where the circuit current requirement is lower than the original 4 A specification or where faster recovery characteristics provide design margin. The HER3L05G operates at 3 A (lower current rating), while HER505GP-TP and HER505GP-AP operate at 5 A (higher current rating). All similar substitutes maintain the fast recovery characteristic and are housed in compatible DO-201AD axial packages.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 400 V
Current - Average Rectified (Io): Must equal or exceed 4 A for direct substitutes; may vary for similar substitutes
Speed Classification: Must maintain Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Through Hole (all candidates)
Package Compatibility: DO-201AA, DO-27, or DO-201AD axial packages
RoHS Status: ROHS3 Compliant (all candidates)

Parameter Comparison

Parameter	MUR440G (Main)	MUR440-E3/54	MUR440-E3/73	HER3L05G	HER505GP-AP	HER505GP-TP
Manufacturer	onsemi	Vishay General Semiconductor	Vishay General Semiconductor	Taiwan Semiconductor Corporation	Micro Commercial Co	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	4 A	4 A	4 A	3 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	1.32 V @ 3 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	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	5 µA @ 400 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Operating Temperature - Junction	-65 to 175 °C	-65 to 175 °C	-65 to 175 °C	-55 to 150 °C	-65 to 150 °C	-65 to 150 °C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-201AA, DO-27, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Direct Substitutes - MUR440-E3/54 and MUR440-E3/73:

The MUR440-E3/54 and MUR440-E3/73 are direct electrical equivalents manufactured by Vishay General Semiconductor - Diodes Division. Both parts maintain identical specifications to the MUR440G across all critical parameters: 400 V reverse voltage, 4 A average rectified current, 1.28 V forward voltage drop at 4 A, 75 ns reverse recovery time, and 10 µA reverse leakage current. Both parts are classified as Active products, ensuring long-term availability and supply chain stability. Both are ROHS3 Compliant and REACH Unaffected, meeting regulatory requirements equivalent to the original part. The MUR440-E3/54 is available in Cut Tape (CT) packaging with 3,941 units in stock, while MUR440-E3/73 is available with 661 units in stock. These parts are suitable for direct replacement in applications requiring the full 4 A current capacity and 400 V voltage rating.

Similar Substitutes - HER3L05G:

The HER3L05G, manufactured by Taiwan Semiconductor Corporation, maintains the 400 V reverse voltage rating and fast recovery speed classification but operates at a reduced current capacity of 3 A. This part is suitable for applications where the circuit current requirement does not exceed 3 A. The HER3L05G exhibits improved reverse recovery characteristics (50 ns versus 75 ns) and reduced reverse leakage current (5 µA versus 10 µA), providing enhanced performance margin in switching applications. The operating temperature range is -55°C to 150°C, which is narrower than the original part's -65°C to 175°C range. This part is ROHS3 Compliant and REACH Unaffected, with 781 units available in Cut Tape (CT) packaging. Selection of this part requires confirmation that the application current requirement does not exceed 3 A.

Similar Substitutes - HER505GP-AP and HER505GP-TP:

The HER505GP-AP and HER505GP-TP, both manufactured by Micro Commercial Co, maintain the 400 V reverse voltage rating and fast recovery speed classification but operate at an increased current capacity of 5 A. These parts are suitable for applications where higher current capacity provides design margin or where the circuit current requirement reaches 5 A. Both parts exhibit improved reverse recovery characteristics (50 ns versus 75 ns) and reduced reverse leakage current (5 µA versus 10 µA). The operating temperature range is -65°C to 150°C, which is narrower than the original part's upper temperature limit. Both parts are REACH Unaffected, with HER505GP-AP available in 916 units and HER505GP-TP available in 819 units, both in Bulk packaging. These parts are suitable for applications requiring current capacity up to 5 A at 400 V reverse voltage.

Frequently Asked Questions (FAQ)

Q: Can MUR440-E3/54 and MUR440-E3/73 be used interchangeably with MUR440G?

A: Yes. Both MUR440-E3/54 and MUR440-E3/73 are direct electrical equivalents with identical voltage, current, and recovery time specifications. The primary difference is packaging format (Cut Tape versus bulk) and inventory availability. Both are suitable for direct replacement in circuits designed for the MUR440G.

Q: What is the difference between DO-201AA and DO-201AD packages?

A: Both DO-201AA and DO-201AD are axial through-hole packages with compatible mechanical dimensions for standard PCB mounting. The primary difference is in lead diameter and plating specifications. Circuits designed for DO-201AA packages can accommodate DO-201AD packages without modification to PCB footprints or mounting hardware.

Q: Can HER3L05G be used in place of MUR440G?

A: HER3L05G can be used only in applications where the circuit current requirement does not exceed 3 A. The part maintains the 400 V voltage rating and fast recovery characteristics but has a lower current capacity than the original 4 A specification. Use of this part in circuits requiring 4 A operation will result in component overstress and potential failure.

Q: Can HER505GP-AP or HER505GP-TP be used in place of MUR440G?

A: Yes, HER505GP-AP and HER505GP-TP can be used in place of MUR440G. Both parts maintain the 400 V voltage rating and fast recovery characteristics while providing higher current capacity (5 A versus 4 A). The improved reverse recovery time (50 ns versus 75 ns) and reduced reverse leakage current provide additional performance margin in switching applications.

Q: What is the significance of the "Active" product status for substitute parts?

A: Active product status indicates that the manufacturer continues to produce and support the part, ensuring long-term availability and supply chain stability. The MUR440G is classified as Obsolete, meaning onsemi no longer manufactures this part. Selection of Active substitute parts ensures that future procurement and design support remain available.

Q: Are all substitute parts RoHS3 Compliant?

A: MUR440-E3/54, MUR440-E3/73, and HER3L05G are explicitly specified as ROHS3 Compliant. HER505GP-AP and HER505GP-TP do not have RoHS status specified in the provided data. Verification of RoHS compliance status with the manufacturer is required if RoHS certification is a design requirement.

Q: What is the impact of reverse recovery time differences on circuit performance?

A: Reverse recovery time (trr) affects switching speed and electromagnetic interference (EMI) characteristics. The MUR440G has a trr of 75 ns, while HER3L05G, HER505GP-AP, and HER505GP-TP have a trr of 50 ns. Faster recovery times reduce switching losses and EMI but do not affect DC circuit operation. Substitution with faster recovery parts provides performance improvement without circuit modification.

Q: What is the operating temperature range consideration for HER3L05G?

A: HER3L05G has an operating temperature range of -55°C to 150°C, compared to MUR440G's -65°C to 175°C. If the application requires operation below -55°C or above 150°C, HER3L05G is not suitable. Verification of the application's thermal requirements is necessary before selecting this part.

Q: How does forward voltage drop affect circuit design?

A: Forward voltage drop (Vf) affects power dissipation and circuit efficiency. MUR440G, MUR440-E3/54, and MUR440-E3/73 have identical Vf of 1.28 V at their respective rated currents. HER3L05G has Vf of 1.32 V at 3 A, and HER505GP-AP and HER505GP-TP have Vf of 1.3 V at 5 A. These differences are minor and do not require circuit redesign for most applications.

Q: What packaging options are available for each substitute part?

A: MUR440-E3/54 is available in Cut Tape (CT) packaging. MUR440-E3/73 packaging is not specified. HER3L05G is available in Cut Tape (CT) packaging. HER505GP-AP and HER505GP-TP are available in Bulk packaging. Packaging selection depends on procurement volume and assembly process requirements.

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