VS-STPS40L15CW-N3 Equivalent & Substitute Parts

Part Overview

The VS-STPS40L15CW-N3 is an active Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component is rated for 15 V DC reverse voltage with 40 A average rectified current capacity. The device is packaged in TO-247AC configuration and is designed for fast recovery applications with switching speeds ≤ 500 ns. This part is ROHS3 compliant and maintains unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Substiute Parts

VS-STPS40L15CW-N3

Vishay General Semiconductor - Diodes DivisionIn Stock: 796VS-STPS40L15CW-N3 Datasheet

Current PartRFQ

MBR4015LWTG

onsemiIn Stock: 1154MBR4015LWTG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the VS-STPS40L15CW-N3 is determined by the following critical parameters:

Voltage Rating Compatibility: The substitute part must maintain a DC reverse voltage rating (Vr) of 15 V or greater to ensure safe operation within the same circuit application.

Current Capacity: The substitute part must support the required average rectified current (Io). The primary part is rated for 40 A; however, substitute parts with lower current ratings may be acceptable in applications where the actual circuit current demand does not exceed the substitute part's rating.

Technology Type: Both the main part and substitute must utilize Schottky diode technology to maintain consistent switching characteristics and forward voltage performance.

Package Configuration: The substitute must use TO-247-3 through-hole packaging to ensure mechanical and thermal compatibility with existing PCB layouts and mounting infrastructure.

Speed Classification: Fast recovery characteristics (≤ 500 ns) must be maintained to preserve switching performance in high-frequency rectification applications.

Regulatory Compliance: Both parts must maintain ROHS3 compliance and MSL 1 rating to satisfy environmental and moisture handling requirements.

The MBR4015LWTG from onsemi qualifies as a substitute based on matching voltage rating, package type, technology, speed classification, and regulatory compliance. The current rating difference (20 A per diode in a common cathode pair configuration versus 40 A single diode) requires circuit-level evaluation to confirm suitability for the specific application.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration - Current Rating: The VS-STPS40L15CW-N3 is a single-diode device rated for 40 A continuous rectified current. The MBR4015LWTG is a diode pair (common cathode configuration) with 20 A per diode rating. Selection of the MBR4015LWTG requires verification that the application circuit current does not exceed 20 A per diode element, or that the dual-diode configuration can be utilized in parallel to achieve equivalent current capacity.

Voltage and Speed Compatibility: Both parts maintain identical 15 V reverse voltage ratings and fast recovery characteristics (≤ 500 ns). These parameters are fully compatible for equivalent circuit operation.

Thermal Performance: The MBR4015LWTG supports an extended operating temperature range (-55°C to 150°C) compared to the VS-STPS40L15CW-N3 (-55°C to 125°C). This provides additional thermal margin in high-temperature applications.

Regulatory and Compliance Status: Both parts are ROHS3 compliant, MSL 1 rated, and maintain active product status. No compliance barriers exist for substitution.

Forward Voltage Characteristics: The MBR4015LWTG exhibits lower forward voltage (420 mV @ 20 A) compared to the VS-STPS40L15CW-N3 (520 mV @ 40 A). This difference reflects the different current ratings and diode configuration rather than a performance advantage or disadvantage.

Reverse Leakage: The MBR4015LWTG demonstrates lower reverse leakage current (5 mA @ 15 V) compared to the main part (10 mA @ 15 V), indicating superior reverse blocking characteristics.

Frequently Asked Questions (FAQ)

Q: Can the MBR4015LWTG directly replace the VS-STPS40L15CW-N3 in all applications?

A: Direct replacement is possible only in applications where the circuit current requirement does not exceed 20 A per diode. The MBR4015LWTG is a dual-diode common cathode configuration; each diode element is rated for 20 A. If the application requires 40 A continuous current from a single diode element, the MBR4015LWTG cannot serve as a direct substitute without circuit redesign.

Q: Are the TO-247-3 packages mechanically identical between these parts?

A: Yes. Both the VS-STPS40L15CW-N3 and MBR4015LWTG use TO-247-3 through-hole packaging. Mechanical compatibility with existing PCB layouts, mounting hardware, and thermal management solutions is maintained.

Q: What is the significance of the "common cathode" configuration in the MBR4015LWTG?

A: The MBR4015LWTG contains two diode elements sharing a common cathode terminal. This configuration is suitable for bridge rectifier applications or dual-channel rectification where two independent diodes with a shared return path are required. The VS-STPS40L15CW-N3 is a single diode and does not have this configuration.

Q: Do both parts meet the same regulatory and environmental standards?

A: Yes. Both the VS-STPS40L15CW-N3 and MBR4015LWTG are ROHS3 compliant, carry MSL 1 (unlimited moisture sensitivity) rating, and maintain active product status. No regulatory or environmental barriers exist for substitution.

Q: How do the reverse voltage ratings compare?

A: Both parts are rated for 15 V maximum DC reverse voltage. Reverse voltage compatibility is fully equivalent between the two parts.

Q: What is the impact of the different forward voltage specifications?

A: The forward voltage difference (520 mV @ 40 A for VS-STPS40L15CW-N3 versus 420 mV @ 20 A for MBR4015LWTG) reflects the different current ratings and measurement conditions rather than a fundamental performance difference. Forward voltage specifications are current-dependent; direct comparison requires evaluation at identical current levels, which is not applicable here due to the different current ratings.

Q: Is the extended temperature range of the MBR4015LWTG (-55°C to 150°C) a significant advantage?

A: The extended upper temperature limit (150°C versus 125°C) provides additional thermal margin in high-temperature environments. This is an advantage in applications operating near the upper temperature boundary of the VS-STPS40L15CW-N3 specification.

Q: Can the lower reverse leakage current of the MBR4015LWTG improve circuit performance?

A: Lower reverse leakage current (5 mA @ 15 V versus 10 mA @ 15 V) indicates superior reverse blocking characteristics. In applications sensitive to leakage current, this characteristic may provide improved performance; however, the significance depends on the specific circuit design and leakage current tolerance requirements.