MUR105RLG Equivalent & Substitute Parts

Part Overview

The MUR105RLG is a general-purpose rectifier diode manufactured by onsemi, rated for 50 V DC reverse voltage and 1 A average rectified current in a through-hole axial package (DO-204AL, DO-41). This device is classified as obsolete, which necessitates identification of functionally equivalent active alternatives for new designs and ongoing production requirements. The MUR105RLG belongs to the SWITCHMODE™ series and features fast recovery characteristics with a reverse recovery time of 35 ns, making it suitable for switching power supply applications and general rectification circuits.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	875 mV @ 1 A	mV
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	2	µA @ 50 V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-65°C to 175°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MUR105RLG is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial compatible

Secondary Compatibility Factors:

Speed Classification: Fast Recovery (≤ 500ns, > 200mA) preferred for switching applications
Reverse Recovery Time (trr): Lower values indicate superior switching performance
Forward Voltage (Vf): Lower values reduce power dissipation
Reverse Leakage Current: Lower values indicate better blocking characteristics
Operating Temperature Range: Must encompass application requirements
RoHS Compliance: ROHS3 Compliant status required for regulatory alignment

Substitute parts are grouped into two categories based on recovery speed characteristics: Fast Recovery devices (trr ≤ 500ns) and Standard Recovery devices (trr > 500ns). Fast Recovery substitutes provide direct functional equivalence for switching applications. Standard Recovery substitutes are suitable for linear rectification applications where switching speed is not critical.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Tj Range [°C]	Status
MUR105RLG	onsemi	50	1	875 @ 1A	Fast Recovery ≤ 500ns	35	2 @ 50V	DO-204AL, DO-41, Axial	-65 to 175	Obsolete
1N4001G	Taiwan Semiconductor Corporation	50	1	1000 @ 1A	Standard Recovery > 500ns	—	5 @ 50V	DO-204AL, DO-41, Axial	-55 to 150	Active
1N4933G	Good-Ark Semiconductor	50	1	1200 @ 1A	Fast Recovery ≤ 500ns	200	5 @ 50V	DO-204AL, DO-41, Axial	-55 to 125	Active
1N4001-BP	Micro Commercial Co	50	1	1000 @ 1A	Standard Recovery > 500ns	2000	5 @ 50V	DO-204AL, DO-41, Axial	-55 to 150	Active
1N4001G R1G	Taiwan Semiconductor Corporation	50	1	1000 @ 1A	Standard Recovery > 500ns	—	5 @ 50V	DO-204AL, DO-41, Axial	-55 to 150	Active
1N4933-E3/54	Vishay General Semiconductor - Diodes Division	50	1	1200 @ 1A	Fast Recovery ≤ 500ns	200	5 @ 50V	DO-204AL, DO-41, Axial	-50 to 150	Active
1N4933GP-AP	Micro Commercial Co	50	1	1200 @ 1A	Fast Recovery ≤ 500ns	200	5 @ 50V	DO-204AL, DO-41, Axial	-55 to 150	Active
1N6076	Microchip Technology	50	1.3	1760 @ 18.8A	Fast Recovery ≤ 500ns	30	5 @ 50V	A, Axial	-65 to 155	Active
BYT54A-TAP	Vishay General Semiconductor - Diodes Division	50	1.25	1500 @ 1A	Fast Recovery ≤ 500ns	100	5 @ 50V	SOD-57, Axial	-55 to 175	Active
EGP10A-E3/54	Vishay General Semiconductor - Diodes Division	50	1	950 @ 1A	Fast Recovery ≤ 500ns	50	5 @ 50V	DO-204AL, DO-41, Axial	-65 to 150	Active
EGP10A-E3/73	Vishay General Semiconductor - Diodes Division	50	1	950 @ 1A	Fast Recovery ≤ 500ns	50	5 @ 50V	DO-204AL, DO-41, Axial	-65 to 150	Active

Engineering Selection Recommendations

Fast Recovery Substitutes (Preferred for Switching Applications):

The EGP10A-E3/54 and EGP10A-E3/73 (Vishay SUPERECTIFIER® series) provide the closest electrical equivalence to the MUR105RLG. Both devices feature 50 V reverse voltage, 1 A average rectified current, fast recovery characteristics (50 ns trr), and forward voltage of 950 mV at 1 A. These parts are ROHS3 compliant, active in production, and available in DO-204AL (DO-41) axial packages. The operating temperature range extends to -65°C, matching the MUR105RLG upper limit. These devices are suitable for direct replacement in switching power supply circuits where the original 35 ns recovery time is not critical.

The 1N4933-E3/54 (Vishay) and 1N4933GP-AP (Micro Commercial Co) offer fast recovery performance with 200 ns reverse recovery time and 1200 mV forward voltage at 1 A. Both are ROHS3 compliant and active. The 1N4933-E3/54 provides the highest inventory availability (14,607 pcs) among fast recovery options. These devices are suitable for applications where slightly higher forward voltage is acceptable.

The 1N6076 (Microchip Technology) provides fast recovery with 30 ns reverse recovery time and higher current rating (1.3 A), extending operating temperature to -65°C. This device is available in A/Axial package format and is suitable for applications requiring higher current margin or superior switching performance.

Standard Recovery Substitutes (For Linear Rectification Applications):

The 1N4001G (Taiwan Semiconductor Corporation) and 1N4001-BP (Micro Commercial Co) are standard recovery devices with 50 V reverse voltage and 1 A average rectified current. Both are ROHS3 compliant and active in production. These devices are suitable for linear rectification applications where switching speed is not a design requirement. The 1N4001G R1G variant (Taiwan Semiconductor Corporation) provides identical electrical specifications with 952 pcs inventory availability.

Compliance and Regulatory Status:

All recommended substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. All devices carry EAR99 ECCN classification and HTSUS code 8541.10.0080. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the MUR105RLG be directly replaced with a 1N4001G?

A: The 1N4001G is electrically compatible in terms of voltage and current ratings (50 V, 1 A). However, the 1N4001G is a standard recovery device with recovery time exceeding 500 ns, while the MUR105RLG is a fast recovery device (35 ns). For switching power supply applications, the EGP10A-E3/54 or 1N4933-E3/54 are preferred substitutes. For linear rectification circuits, the 1N4001G is acceptable.

Q: What is the significance of reverse recovery time (trr) in selecting a substitute?

A: Reverse recovery time determines how quickly the diode transitions from conducting to blocking state. Fast recovery devices (trr ≤ 500 ns) are essential in switching power supplies to minimize switching losses and electromagnetic interference. Standard recovery devices (trr > 500 ns) are suitable for line-frequency rectification and other non-switching applications. The MUR105RLG's 35 ns recovery time indicates use in high-frequency switching circuits.

Q: Are all substitute parts available in the same package as the MUR105RLG?

A: Most substitutes are available in DO-204AL (DO-41) axial packages, which are mechanically compatible with the MUR105RLG. The BYT54A-TAP uses SOD-57 package format, which is also axial but has different physical dimensions. The 1N6076 uses A/Axial package format. Package compatibility must be verified for PCB layout and mechanical assembly requirements.

Q: What is the difference between forward voltage specifications at different current levels?

A: Forward voltage varies with current. The MUR105RLG specifies 875 mV at 1 A, while the 1N6076 specifies 1760 mV at 18.8 A. These measurements are taken at different operating points. For direct comparison at equivalent operating conditions, specifications at the same current level (1 A) should be used. Higher forward voltage results in greater power dissipation in the diode.

Q: Why do some substitute parts have higher reverse leakage current (Ir) than the MUR105RLG?

A: The MUR105RLG specifies 2 µA reverse leakage at 50 V, while most substitutes specify 5 µA. This difference reflects manufacturing process variations and device design. For most applications, this difference is negligible. In high-impedance circuits or precision analog applications, lower leakage current may be preferred.

Q: Can I use a substitute with higher current rating (e.g., 1N6076 at 1.3 A) in place of the 1 A MUR105RLG?

A: Yes. A device with higher current rating can be used in applications requiring the lower current rating. The higher current rating provides additional safety margin and thermal headroom. However, physical package dimensions and thermal characteristics may differ, requiring verification of PCB layout and heat dissipation requirements.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the device does not contain restricted substances including lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers. All recommended substitutes are ROHS3 compliant, meeting current regulatory requirements for electronic equipment sold in regulated markets.

Q: How does operating temperature range affect substitute selection?

A: The MUR105RLG operates from -65°C to 175°C. Some substitutes have narrower ranges (e.g., 1N4933G: -55°C to 125°C). If the application requires operation at the MUR105RLG's full temperature range, substitutes with matching or wider ranges must be selected. The EGP10A series and 1N6076 extend to -65°C, providing full compatibility.

Q: What is the difference between Cut Tape (CT), Tape & Reel (TR), and Bulk packaging?

A: Packaging format affects component handling and assembly processes. Tape & Reel (TR) and Cut Tape (CT) are suitable for automated assembly equipment. Bulk packaging is used for manual assembly or reel consolidation. The MUR105RLG packaging is not specified in the provided data. Substitute selection should consider manufacturing process requirements and assembly equipment compatibility.

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