MUR405G Equivalent & Substitute Parts

Part Overview

The MUR405G is a general-purpose rectifier diode manufactured by onsemi, rated for 50 V DC reverse voltage and 4 A average rectified current. The device features fast recovery characteristics with a reverse recovery time of 35 ns and is housed in a DO-201AA/DO-27 axial package for through-hole mounting applications. The MUR405G is classified as obsolete, necessitating identification of active substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	890 mV @ 4 A	mV
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 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	°C
Technology	Standard	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the MUR405G is determined by the following critical parameters: voltage rating (50 V DC reverse), current rating (4 A average rectified), fast recovery speed classification (≤ 500ns), through-hole axial mounting configuration, and operating temperature range compatibility. Substitute parts must maintain or exceed these electrical specifications while providing equivalent or superior performance characteristics.

The substitute parts identified fall into three technology categories:

Standard Technology (Closest Match): UG4A-E3/54 maintains identical voltage and current ratings with standard rectifier technology, matching the MUR405G's core electrical profile.

Avalanche Technology: BYV28-050-TR and BYV28-050-TAP provide 50 V voltage rating with 3.5 A current rating, representing a slight current derating but offering avalanche diode technology with improved reverse recovery characteristics (30 ns versus 35 ns).

Schottky Technology: SB550-T provides 50 V voltage rating with 5 A current rating, exceeding the current specification while offering Schottky diode technology with lower forward voltage drop (670 mV versus 890 mV).

All substitute parts maintain fast recovery speed classification, through-hole axial mounting, ROHS3 compliance, and active product status.

Parameter Comparison

Parameter	MUR405G (onsemi)	UG4A-E3/54 (Vishay)	BYV28-050-TR (Vishay)	BYV28-050-TAP (Vishay)	SB550-T (Diodes Inc.)
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	4 A	4 A	3.5 A	3.5 A	5 A
Voltage - Forward (Vf) (Max) @ If	890 mV @ 4 A	950 mV @ 4 A	1.1 V @ 5 A	1.1 V @ 5 A	670 mV @ 5 A
Reverse Recovery Time (trr)	35 ns	30 ns	30 ns	30 ns	Not specified
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	1 µA @ 50 V	1 µA @ 50 V	500 µA @ 50 V
Speed Classification	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-201AA, DO-27, Axial	DO-201AD, Axial	SOD-64, Axial	SOD-64, Axial	DO-201AD, Axial
Operating Temperature - Junction	-65°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 175°C	-65°C ~ 150°C
Technology	Standard	Standard	Avalanche	Avalanche	Schottky
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: UG4A-E3/54

The UG4A-E3/54 from Vishay General Semiconductor - Diodes Division provides the closest electrical equivalence to the MUR405G. This part maintains identical voltage (50 V) and current (4 A) ratings with standard rectifier technology. The forward voltage specification (950 mV @ 4 A) is marginally higher than the original (890 mV @ 4 A), and the reverse recovery time (30 ns) is superior. The operating temperature range (-55°C ~ 150°C) is narrower than the original (-65°C ~ 175°C), requiring verification of application requirements at temperature extremes. The UG4A-E3/54 is active, ROHS3 compliant, and available in DO-201AD axial package configuration. Package compatibility requires mechanical verification due to DO-201AD versus DO-201AA/DO-27 dimensional differences.

Secondary Substitute: BYV28-050-TR or BYV28-050-TAP

The BYV28-050-TR (Tape & Reel) and BYV28-050-TAP (Tape & Box) from Vishay provide avalanche diode technology with 50 V voltage rating and 3.5 A current rating. The current rating represents a 12.5% derating from the original 4 A specification. Both variants feature superior reverse recovery time (30 ns) and lower reverse leakage current (1 µA versus 5 µA). The operating temperature range extends to 175°C, matching the original upper limit. Both parts are active and ROHS3 compliant. Package configuration is SOD-64 axial, requiring mechanical verification for board-level compatibility.

Tertiary Substitute: SB550-T

The SB550-T from Diodes Incorporated provides Schottky diode technology with 50 V voltage rating and 5 A current rating, exceeding the original current specification by 25%. The forward voltage drop (670 mV @ 5 A) is significantly lower than the original (890 mV @ 4 A), resulting in reduced power dissipation. The reverse leakage current is substantially higher (500 µA versus 5 µA), which may impact circuit performance in low-leakage applications. The operating temperature range (-65°C ~ 150°C) matches the lower limit but is 25°C lower at the upper limit. The SB550-T is active and ROHS3 compliant, available in DO-201AD axial package. Schottky technology introduces different thermal and switching characteristics requiring circuit-level evaluation.

All substitute parts maintain ROHS3 compliance and fast recovery speed classification. Selection depends on specific application requirements regarding current derating tolerance, forward voltage drop, reverse leakage current, operating temperature range, and package mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the UG4A-E3/54 directly replace the MUR405G without circuit modification?

A: The UG4A-E3/54 maintains identical voltage and current ratings with standard rectifier technology, providing functional equivalence. However, the forward voltage specification is 60 mV higher (950 mV versus 890 mV), which may affect circuit performance in applications with tight voltage budgets. The operating temperature range is narrower (-55°C ~ 150°C versus -65°C ~ 175°C), requiring verification for extreme temperature operation. Package configuration differs (DO-201AD versus DO-201AA/DO-27), necessitating mechanical compatibility assessment.

Q: Why is the BYV28-050-TR rated for 3.5 A when the MUR405G is rated for 4 A?

A: The BYV28-050-TR employs avalanche diode technology, which provides different electrical characteristics than standard rectifier technology. The 3.5 A rating represents the maximum average rectified current for this specific technology and package configuration. Applications requiring the full 4 A specification should use the UG4A-E3/54 or SB550-T.

Q: What is the primary advantage of the SB550-T Schottky substitute?

A: The SB550-T provides a significantly lower forward voltage drop (670 mV @ 5 A versus 890 mV @ 4 A), resulting in reduced power dissipation and improved efficiency in high-current applications. The 5 A current rating exceeds the original specification. However, the reverse leakage current is substantially higher (500 µA versus 5 µA), which may be problematic in circuits requiring low reverse leakage characteristics.

Q: Are all substitute parts available in the same axial package as the MUR405G?

A: All substitute parts are through-hole axial devices, but package designations differ. The MUR405G uses DO-201AA/DO-27, the UG4A-E3/54 and SB550-T use DO-201AD, and the BYV28-050-TR/BYV28-050-TAP use SOD-64. While all are axial configurations, physical dimensions vary, requiring mechanical verification for printed circuit board compatibility.

Q: Which substitute part has the best reverse recovery time performance?

A: The BYV28-050-TR, BYV28-050-TAP, and UG4A-E3/54 all feature 30 ns reverse recovery time, which is superior to the original MUR405G specification of 35 ns. The SB550-T does not specify reverse recovery time in the provided data.

Q: Can the BYV28-050-TAP (Tape & Box) and BYV28-050-TR (Tape & Reel) be used interchangeably?

A: The BYV28-050-TAP and BYV28-050-TR are electrically identical, differing only in packaging format (Tape & Box versus Tape & Reel). Selection depends on manufacturing process requirements and inventory management practices. Both parts maintain identical electrical specifications and are active products.

Q: What is the impact of the narrower operating temperature range in the UG4A-E3/54?

A: The UG4A-E3/54 operates from -55°C to 150°C, compared to the MUR405G range of -65°C to 175°C. Applications requiring operation below -55°C or above 150°C cannot use this substitute. The BYV28-050-TR and BYV28-050-TAP extend to 175°C at the upper limit, providing better high-temperature compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all identified substitute parts (UG4A-E3/54, BYV28-050-TR, BYV28-050-TAP, and SB550-T) are ROHS3 compliant, matching the compliance status of the original MUR405G.

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