MUR405 Equivalent & Substitute Parts

Part Overview

The MUR405 is a general-purpose rectifier diode rated for 50 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 35 ns and is housed in a DO-201AA/DO-27 axial package for through-hole mounting applications.

The MUR405 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this rectifier diode.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	50	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) Maximum @ If	890 mV @ 4 A	mV @ A
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 to 175°C	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the MUR405 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 50 V
Current - Average Rectified (Io) rating must equal or exceed 4 A
Reverse Recovery Time (trr) must support fast recovery operation (≤ 500ns, > 200mA)
Mounting type must be through-hole compatible
Package form factor must accommodate axial lead configuration

Substitute Parts Classification:

Direct Equivalent: MUR405G (onsemi) — Identical electrical specifications and axial package configuration. Differs only in RoHS compliance status (ROHS3 Compliant vs. non-compliant).

Similar Substitutes: BYV28-050-TAP and BYV28-050-TR (Vishay) — Meet voltage and speed requirements with comparable reverse recovery time (30 ns). Current rating is 3.5 A, which is lower than the MUR405 4 A specification. Avalanche technology provides enhanced reverse voltage protection. Available in SOD-64 axial package.

Partial Substitute: STTH302 (STMicroelectronics) — Exceeds voltage rating at 200 V and maintains fast recovery characteristics. Current rating is 3 A, below the MUR405 specification. Available in DO-201AD axial package.

Parameter Comparison

Parameter	MUR405	MUR405G	BYV28-050-TAP	BYV28-050-TR	STTH302
Manufacturer	onsemi	onsemi	Vishay	Vishay	STMicroelectronics
Voltage - DC Reverse (Vr) Max (V)	50	50	50	50	200
Current - Average Rectified (Io) (A)	4	4	3.5	3.5	3
Voltage - Forward (Vf) Max @ If	890 mV @ 4 A	890 mV @ 4 A	1.1 V @ 5 A	1.1 V @ 5 A	950 mV @ 3 A
Reverse Recovery Time (trr) (ns)	35	35	30	30	35
Current - Reverse Leakage @ Vr (µA)	5 @ 50 V	5 @ 50 V	1 @ 50 V	1 @ 50 V	3 @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Technology	Standard	Standard	Avalanche	Avalanche	Standard
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-201AA, DO-27, Axial	DO-201AA, DO-27, Axial	SOD-64, Axial	SOD-64, Axial	DO-201AD, Axial
Operating Temperature - Junction (°C)	-65 to 175	-65 to 175	-55 to 175	-55 to 175	Max 175
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MUR405G (onsemi): This part is the direct equivalent to the MUR405, providing identical electrical performance and package configuration. MUR405G is classified as obsolete but achieves ROHS3 compliance, making it suitable for applications requiring regulatory adherence. Selection of MUR405G is appropriate when exact electrical and mechanical compatibility is required and supply availability permits.

BYV28-050-TAP and BYV28-050-TR (Vishay): These parts are active products with ROHS3 compliance and represent viable alternatives for applications where the 3.5 A current rating is acceptable. The avalanche technology provides enhanced reverse voltage protection compared to standard rectifier technology. The SOD-64 package differs from the original DO-201AA/DO-27 form factor and requires mechanical verification for board layout compatibility. BYV28-050-TR is supplied on tape and reel, while BYV28-050-TAP is supplied in tape and box format.

STTH302 (STMicroelectronics): This part is an active product with ROHS3 compliance and a 200 V reverse voltage rating, exceeding the MUR405 specification. The 3 A current rating falls below the original 4 A specification and requires circuit analysis to confirm adequacy. The DO-201AD package is compatible with through-hole mounting but differs from the original DO-201AA/DO-27 specification. Selection is appropriate only when the reduced current rating and elevated voltage rating align with application requirements.

Frequently Asked Questions (FAQ)

Q: Can MUR405G be used as a direct replacement for MUR405?

A: Yes. MUR405G provides identical electrical specifications (50 V, 4 A, 35 ns reverse recovery time) and the same axial package configuration. The primary difference is RoHS compliance status. Both parts are classified as obsolete.

Q: What are the limitations of using BYV28-050-TAP or BYV28-050-TR as substitutes?

A: The BYV28 series has a maximum current rating of 3.5 A, which is 0.5 A lower than the MUR405 4 A specification. Applications operating at or near 4 A require circuit analysis to confirm the reduced rating is acceptable. The SOD-64 package differs from the original DO-201AA/DO-27 form factor and requires mechanical verification for PCB compatibility. Both parts are active products with ROHS3 compliance.

Q: Is STTH302 suitable for all MUR405 applications?

A: STTH302 is not a direct substitute. While it maintains the 50 V voltage class and fast recovery characteristics, the 3 A current rating is 1 A below the MUR405 specification. Additionally, the 200 V reverse voltage rating exceeds the original requirement. Selection requires circuit analysis to confirm the reduced current rating and elevated voltage rating are compatible with the application.

Q: What is the difference between BYV28-050-TAP and BYV28-050-TR?

A: Both parts are electrically identical with 50 V, 3.5 A ratings and SOD-64 package configuration. The difference is in packaging format: BYV28-050-TAP is supplied in tape and box (TB) format, while BYV28-050-TR is supplied on tape and reel (TR). Selection depends on procurement and assembly process requirements.

Q: Are all substitute parts RoHS compliant?

A: MUR405G, BYV28-050-TAP, BYV28-050-TR, and STTH302 are all ROHS3 compliant. The original MUR405 is RoHS non-compliant. Applications subject to RoHS requirements must use one of the compliant alternatives.

Q: What is the operating temperature range for each substitute?

A: MUR405 and MUR405G operate from -65°C to 175°C. BYV28-050-TAP and BYV28-050-TR operate from -55°C to 175°C, with a 10°C lower minimum temperature limit. STTH302 has a maximum operating temperature of 175°C with no specified minimum. Applications requiring operation below -55°C must use MUR405 or MUR405G.

Q: How do reverse leakage currents compare across substitutes?

A: MUR405 and MUR405G specify 5 µA reverse leakage at 50 V. BYV28-050-TAP and BYV28-050-TR specify 1 µA reverse leakage at 50 V, representing lower leakage. STTH302 specifies 3 µA reverse leakage at 200 V. Lower reverse leakage may provide performance benefits in high-impedance circuits.

Q: What is the difference between standard and avalanche rectifier technology?

A: MUR405, MUR405G, and STTH302 use standard rectifier technology. BYV28-050-TAP and BYV28-050-TR use avalanche technology, which provides enhanced reverse voltage protection through controlled avalanche breakdown. Avalanche diodes are suitable for applications with transient overvoltage conditions.

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