MUR240 Equivalent & Substitute Parts

Part Overview

The MUR240 is a general-purpose fast recovery rectifier diode rated for 400 V DC reverse voltage and 2 A average rectified current in an axial through-hole package. Manufactured by onsemi under 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 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)	2	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 2 A	V
Reverse Recovery Time (trr)	65	ns
Current - Reverse Leakage @ Vr	5 @ 400 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-65 to 175	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the MUR240 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) rating must equal or exceed 400 V
Current - Average Rectified (Io) rating must equal or exceed 2 A
Speed classification must be Fast Recovery (≤ 500ns, > 200mA)
Reverse Recovery Time (trr) must be ≤ 500 ns
Reverse Leakage Current must not exceed 5 µA @ rated voltage

Mechanical Compatibility Requirements:

Mounting Type: Through Hole
Package compatibility: Axial or equivalent through-hole form factors (DO-204AL, DO-41, DO-15, SOD-57)
Operating Temperature range must support -65°C to 175°C or equivalent industrial range

Compliance and Status:

RoHS3 compliance preferred for new designs
Active product status preferred for long-term availability

Substitute parts are grouped into two categories:

Direct Equivalents: Parts meeting all electrical specifications with identical or superior ratings and active product status.

Functional Equivalents: Parts meeting core electrical requirements with minor parameter variations (such as different package form factors or slightly different reverse recovery times) that remain within acceptable operating margins for the application.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	RoHS Status
MUR240	onsemi	400	2	1.3 @ 2 A	65	5 @ 400 V	DO-204AL, DO-41, Axial	Obsolete	Non-compliant
MUR240G	onsemi	400	2	1.3 @ 2 A	65	5 @ 400 V	DO-204AL, DO-41, Axial	Obsolete	ROHS3 Compliant
EGP20G	Fairchild Semiconductor	400	2	1.25 @ 2 A	50	5 @ 400 V	DO-204AC, DO-15, Axial	Active	Not specified
BYW34-TAP	Vishay General Semiconductor - Diodes Division	400	2	1.1 @ 1 A	200	5 @ 400 V	SOD-57, Axial	Active	ROHS3 Compliant
BYW34-TR	Vishay General Semiconductor - Diodes Division	400	2	1.1 @ 1 A	200	5 @ 400 V	SOD-57, Axial	Active	ROHS3 Compliant
BYT53G-TAP	Vishay General Semiconductor - Diodes Division	400	1.9	1.1 @ 1 A	50	5 @ 400 V	SOD-57, Axial	Active	ROHS3 Compliant
BYT53G-TR	Vishay General Semiconductor - Diodes Division	400	1.9	1.1 @ 1 A	50	5 @ 400 V	SOD-57, Axial	Active	ROHS3 Compliant
1N4935-T	Diodes Incorporated	200	1	1.2 @ 1 A	200	5 @ 200 V	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant
1N4935G-T	Diodes Incorporated	200	1	1.2 @ 1 A	200	5 @ 200 V	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant
1N4935G	Taiwan Semiconductor Corporation	200	1	1.2 @ 1 A	200	5 @ 200 V	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant
31GF4-E3/54	Vishay General Semiconductor - Diodes Division	400	3	1.25 @ 3 A	30	20 @ 400 V	DO-201AD, Axial	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: MUR240G

MUR240G is the direct equivalent of MUR240, manufactured by onsemi with identical electrical specifications. The primary distinction is RoHS3 compliance, making MUR240G suitable for applications requiring environmental compliance. Both parts share the same voltage, current, and thermal ratings. MUR240G is classified as obsolete but remains available in inventory. This part is recommended for direct replacement in existing designs where RoHS compliance is required.

Secondary Substitute: EGP20G

EGP20G, manufactured by Fairchild Semiconductor, meets the core electrical requirements with 400 V reverse voltage and 2 A average rectified current. The reverse recovery time is superior (50 ns versus 65 ns), and forward voltage is slightly lower (1.25 V versus 1.3 V). The primary difference is package form factor: EGP20G uses DO-15 (DO-204AC) instead of DO-41 (DO-204AL). EGP20G is active product status with high inventory availability (36,600 units), making it suitable for new designs and long-term production support.

Tertiary Substitutes: BYW34-TAP, BYW34-TR, BYT53G-TAP, BYT53G-TR

These Vishay avalanche diodes meet the 400 V and 2 A specifications with active product status and RoHS3 compliance. BYW34 variants provide exact 2 A current rating with 200 ns reverse recovery time. BYT53G variants provide 1.9 A current rating with 50 ns reverse recovery time. All use SOD-57 package form factor. These parts are suitable for applications where package form factor flexibility is acceptable and avalanche technology is compatible with circuit requirements.

Not Recommended: 1N4935 Series (1N4935-T, 1N4935G-T, 1N4935G)

The 1N4935 series parts are rated for 200 V reverse voltage and 1 A average rectified current. These specifications fall below the MUR240 requirements and do not meet substitution criteria for applications requiring 400 V and 2 A ratings.

Not Recommended: 31GF4-E3/54

While this part meets voltage and exceeds current requirements (3 A), the reverse leakage current specification (20 µA @ 400 V) exceeds the MUR240 specification (5 µA @ 400 V). This part is suitable only for applications with relaxed leakage requirements.

Frequently Asked Questions (FAQ)

Q: Can MUR240G be used as a direct replacement for MUR240?

A: Yes. MUR240G is manufactured by onsemi with identical electrical specifications: 400 V reverse voltage, 2 A average rectified current, 1.3 V forward voltage at 2 A, and 65 ns reverse recovery time. The primary difference is RoHS3 compliance. Both parts use the same DO-41 axial package. MUR240G is the recommended direct replacement.

Q: What is the difference between MUR240 and EGP20G?

A: Both parts are rated for 400 V and 2 A. EGP20G has superior reverse recovery time (50 ns versus 65 ns) and slightly lower forward voltage (1.25 V versus 1.3 V). The key difference is package form factor: EGP20G uses DO-15 while MUR240 uses DO-41. EGP20G is active product status with high availability. Substitution is valid if the DO-15 package is mechanically compatible with the circuit board layout.

Q: Can BYW34 or BYT53 avalanche diodes replace MUR240?

A: Yes, with technology considerations. BYW34 and BYT53 are avalanche diodes rated for 400 V and 2 A (BYW34) or 1.9 A (BYT53). Both meet the voltage and current requirements. The primary differences are package form factor (SOD-57 instead of DO-41) and technology type (avalanche instead of standard). Substitution is valid if the circuit design is compatible with avalanche diode characteristics and the SOD-57 package fits the board layout.

Q: Why are 1N4935 parts not suitable substitutes?

A: The 1N4935 series is rated for 200 V reverse voltage and 1 A average rectified current. These specifications are below the MUR240 requirements of 400 V and 2 A. Using an underrated component violates electrical compatibility and creates reliability risk.

Q: What does "Fast Recovery" mean in the speed classification?

A: Fast Recovery indicates reverse recovery time of 500 ns or less with reverse current greater than 200 mA. This classification ensures the diode switches off quickly, reducing switching losses in power supply and converter applications. MUR240 has a reverse recovery time of 65 ns, which is well within the fast recovery specification.

Q: Are there package compatibility considerations when substituting MUR240?

A: Yes. MUR240 uses DO-41 (DO-204AL) axial package. Substitutes using different packages (DO-15, SOD-57, DO-201AD) require verification of mechanical fit on the circuit board. Pin spacing, lead diameter, and component height must be compatible with the PCB layout and assembly equipment. Consult the datasheet for specific package dimensions.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: RoHS3 compliance indicates the part meets European Union restrictions on hazardous substances. For new designs and applications subject to environmental regulations, RoHS3-compliant parts are required. MUR240 is non-compliant, while MUR240G, EGP20G, and Vishay avalanche diodes are RoHS3 compliant. For legacy systems, non-compliant parts may remain acceptable if regulatory requirements do not apply.

Q: Can I use 31GF4-E3/54 as a substitute for MUR240?

A: Not recommended. While 31GF4-E3/54 meets the voltage requirement (400 V) and exceeds the current requirement (3 A), the reverse leakage current is 20 µA @ 400 V, which exceeds the MUR240 specification of 5 µA @ 400 V. This higher leakage may cause excessive power dissipation and thermal stress in applications with tight leakage budgets. Use only if the application tolerates higher leakage current.

Q: What is the difference between cut tape (CT) and tape & reel (TR) packaging?

A: Cut Tape (CT) and Tape & Reel (TR) are distribution formats for the same component. CT is supplied in individual strips cut from the reel, suitable for small-quantity orders and manual assembly. TR is supplied on continuous reel, suitable for high-volume automated assembly. The electrical and mechanical specifications of the component are identical; the difference is only in packaging format and handling method.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message