VS-MBR350 Equivalent & Substitute Parts

Part Overview

The VS-MBR350 is a Schottky rectifier diode rated for 50 V DC reverse voltage and 3 A average rectified current in a through-hole DO-201AD axial package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical performance within the specified voltage, current, and thermal operating ranges while accommodating available packaging formats.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	730 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	600 µA @ 50 V	µA
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-40°C ~ 150°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Electrical Requirements:

Voltage - DC Reverse (Vr) (Max): Minimum 50 V
Current - Average Rectified (Io): 3 A
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Considerations:

Voltage - Forward (Vf) (Max) @ If: ≤ 730 mV @ 3 A
Current - Reverse Leakage @ Vr: ≤ 600 µA @ 50 V
Operating Temperature - Junction: Minimum -40°C to maximum 150°C
Mounting Type: Through Hole
RoHS Compliance: ROHS3 Compliant preferred

Substitute parts are grouped into two categories based on package compatibility and electrical performance:

Group 1 - Direct Package Match (DO-201AD): SB350-E3/54, SR305-TP. These maintain the original DO-201AD axial package format with equivalent or superior electrical characteristics.

Group 2 - Alternative Package (DO-15): STPS3L60Q, STPS3L60QRL. These provide higher voltage rating (60 V) in a smaller DO-15 package, suitable for space-constrained applications where the increased voltage margin is acceptable.

Group 3 - Voltage Derating: 1N5822. This part operates at 40 V maximum reverse voltage, below the 50 V requirement, and is included only for applications where the circuit voltage does not exceed 40 V.

Parameter Comparison

Parameter	VS-MBR350	SB350-E3/54	SR305-TP	STPS3L60Q	STPS3L60QRL	1N5822
Manufacturer	Vishay	Vishay	Micro Commercial Co	STMicroelectronics	STMicroelectronics	Microchip Technology
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	60 V	60 V	40 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	730 mV @ 3 A	680 mV @ 3 A	720 mV @ 3 A	620 mV @ 3 A	620 mV @ 3 A	500 mV @ 3 A
Current - Reverse Leakage @ Vr	600 µA @ 50 V	500 µA @ 50 V	1 mA @ 50 V	60 µA @ 60 V	60 µA @ 60 V	100 µA @ 40 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	B, Axial
Operating Temperature - Junction	-40°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 125°C	150°C (Max)	150°C (Max)	-65°C ~ 125°C
Product Status	Obsolete	Active	Not For New Designs	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

Primary Recommendation: SB350-E3/54

The SB350-E3/54 is the preferred direct substitute for the VS-MBR350. This part maintains identical electrical specifications (50 V, 3 A) in the same DO-201AD package format. The SB350-E3/54 is manufactured by Vishay, the same supplier as the original part, and carries Active product status with ROHS3 compliance. Forward voltage is improved at 680 mV compared to 730 mV, and reverse leakage is reduced to 500 µA. Operating temperature range extends to -65°C, providing enhanced low-temperature performance. This part is suitable for direct board-level substitution without design modification.

Secondary Recommendation: STPS3L60Q / STPS3L60QRL

The STPS3L60Q and STPS3L60QRL are functionally equivalent alternatives manufactured by STMicroelectronics. Both parts provide 60 V reverse voltage rating and 3 A current capacity with superior forward voltage characteristics (620 mV). These parts are packaged in DO-15 format, which is physically smaller than DO-201AD. The STPS3L60Q is supplied in Cut Tape packaging, while STPS3L60QRL is supplied in Tape & Reel format. Both carry Active product status and ROHS3 compliance. Selection between these two depends on procurement and assembly requirements. Package change from DO-201AD to DO-15 requires PCB layout verification for lead spacing and hole diameter compatibility.

Alternative for Voltage-Derating Applications: 1N5822

The 1N5822 is suitable only for applications where the circuit maximum voltage does not exceed 40 V. This Microchip Technology part offers superior forward voltage performance (500 mV) and reduced reverse leakage (100 µA @ 40 V). However, the 1N5822 carries RoHS non-compliant status and is not recommended for new designs subject to RoHS requirements. The package format (B, Axial) differs from the original, requiring PCB layout verification.

Not Recommended: SR305-TP

The SR305-TP is designated as Not For New Designs by the manufacturer. While electrical specifications are acceptable, this status indicates the part is in end-of-life phase and should not be selected for new product development.

Frequently Asked Questions (FAQ)

Q: Can the SB350-E3/54 be used as a direct replacement for the VS-MBR350 without PCB modification?

A: Yes. The SB350-E3/54 maintains the DO-201AD axial package format with identical lead spacing and hole diameter requirements. No PCB layout changes are required for this substitution.

Q: What is the primary difference between STPS3L60Q and STPS3L60QRL?

A: Both parts are electrically identical with 60 V reverse voltage and 3 A current rating. The difference is packaging format: STPS3L60Q is supplied in Cut Tape (CT), while STPS3L60QRL is supplied in Tape & Reel (TR). Selection depends on assembly line requirements and procurement volume.

Q: Why is the 1N5822 listed as a substitute if it has only 40 V rating?

A: The 1N5822 is included for applications where the actual circuit operating voltage does not exceed 40 V. In such cases, the lower voltage rating does not represent a functional limitation. However, this part is not suitable for circuits designed to operate at the full 50 V specification of the VS-MBR350.

Q: Can STPS3L60Q replace VS-MBR350 in a 50 V circuit?

A: Yes. The STPS3L60Q is rated for 60 V reverse voltage, which exceeds the 50 V requirement. The higher voltage rating provides additional safety margin. However, the DO-15 package is physically smaller than DO-201AD, requiring verification that PCB hole spacing and lead diameter accommodate the new package geometry.

Q: Is the VS-MBR350 still available for purchase?

A: The VS-MBR350 is classified as Obsolete. While inventory may exist from distributors, new production is not available from the manufacturer. Active alternatives such as SB350-E3/54 should be specified for new designs and ongoing production.

Q: What is the impact of forward voltage differences between substitute parts?

A: Forward voltage differences affect power dissipation and heat generation. Lower forward voltage (STPS3L60Q at 620 mV) results in reduced power loss compared to higher forward voltage (SR305-TP at 720 mV). For high-current or continuous-duty applications, the lower forward voltage of STPS3L60Q or 1N5822 may provide thermal advantages.

Q: Are all substitute parts RoHS compliant?

A: Five of the six substitute parts carry ROHS3 Compliant status. The 1N5822 is RoHS non-compliant and should not be used in applications subject to RoHS requirements.

Q: What is the minimum reverse voltage rating acceptable for a VS-MBR350 substitute?

A: The minimum acceptable reverse voltage rating is 50 V to match the original specification. Parts rated below 50 V (such as 1N5822 at 40 V) are suitable only for applications where the actual circuit voltage does not exceed their rating.

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