STPS40L15CW Equivalent & Substitute Parts

Part Overview

The STPS40L15CW is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. It features a 1 Pair Common Cathode configuration rated for 15 V DC reverse voltage and 20 A average rectified current per diode. The device is packaged in TO-247-3 through-hole format and utilizes fast recovery Schottky technology with switching speeds ≤ 500 ns.

The STPS40L15CW is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

STPS40L15CW

Vishay General Semiconductor - Diodes DivisionIn Stock: 1262STPS40L15CW Datasheet

Current PartRFQ

DSSK70-0015B

IXYSIn Stock: 10248DSSK70-0015B Datasheet

MFR RecommendedRFQ

STPS40L15CW

Vishay General Semiconductor - Diodes DivisionIn Stock: 1262STPS40L15CW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Mandatory Matching Parameters:

• Diode Configuration: 1 Pair Common Cathode
• Technology: Schottky
• Voltage - DC Reverse (Vr) (Max): 15 V
• Mounting Type: Through Hole
• Package / Case: TO-247-3

Allowable Parameter Variations:

• Current - Average Rectified (Io): Substitute parts may have equal or higher current ratings
• Voltage - Forward (Vf): Substitute parts may have equal or lower forward voltage
• Operating Temperature - Junction: Substitute parts may have equal or wider temperature range
• Current - Reverse Leakage @ Vr: Substitute parts may have equal or lower reverse leakage

The DSSK70-0015B meets all mandatory matching criteria and exceeds performance in current capacity (35 A vs. 20 A), forward voltage characteristics, and operating temperature range (-55 to 150°C vs. -55 to 125°C).

Parameter Comparison

Engineering Selection Recommendations

DSSK70-0015B Selection Criteria:

The DSSK70-0015B is the primary substitute for the obsolete STPS40L15CW. Selection is based on the following engineering factors:

1. Part Status: DSSK70-0015B is classified as Active, ensuring long-term availability and supply chain continuity compared to the obsolete STPS40L15CW.

2. Regulatory Compliance: DSSK70-0015B is ROHS3 Compliant, meeting current environmental and regulatory requirements. The STPS40L15CW is RoHS non-compliant, which may restrict use in regulated applications and markets.

3. Electrical Compatibility: DSSK70-0015B maintains identical reverse voltage rating (15 V) and diode configuration (1 Pair Common Cathode). The higher current rating (35 A vs. 20 A) provides design margin and thermal headroom in applications operating at or near the original 20 A specification.

4. Thermal Performance: DSSK70-0015B supports an extended operating temperature range (-55 to 150°C vs. -55 to 125°C), enabling deployment in higher-temperature environments.

5. Package Compatibility: Both devices use TO-247-3 through-hole packaging, ensuring mechanical and electrical pin compatibility without PCB redesign.

Application Considerations:

The DSSK70-0015B is suitable for direct substitution in applications where the STPS40L15CW was originally specified. The higher current capacity and improved thermal range do not introduce compatibility issues and enhance system reliability margins.

Frequently Asked Questions (FAQ)

Q: Can DSSK70-0015B directly replace STPS40L15CW without PCB modification?

A: Yes. Both devices use TO-247-3 through-hole packaging with identical pin configuration and spacing. No PCB redesign is required for mechanical or electrical substitution.

Q: What is the significance of the higher current rating (35 A vs. 20 A) in DSSK70-0015B?

A: The higher current rating indicates the DSSK70-0015B can safely conduct 35 A average rectified current per diode, compared to 20 A for the STPS40L15CW. In applications operating at or below 20 A, this provides additional thermal margin and reduces junction temperature rise, extending device lifetime and improving reliability.

Q: Why is RoHS compliance important for this substitution?

A: ROHS3 compliance ensures the DSSK70-0015B meets current environmental regulations for hazardous substance restrictions. The STPS40L15CW's RoHS non-compliant status may restrict its use in regulated markets and new product designs. DSSK70-0015B compliance simplifies regulatory documentation and supply chain qualification.

Q: Are there differences in forward voltage characteristics between the two parts?

A: DSSK70-0015B has a forward voltage of 450 mV @ 35 A, compared to 410 mV @ 19 A for STPS40L15CW. The forward voltage difference reflects measurement at different current levels. At equivalent current levels, forward voltage characteristics are comparable for Schottky diodes of this class. Verify forward voltage performance in your specific application circuit if thermal dissipation is a critical design constraint.

Q: What is the impact of higher reverse leakage current in DSSK70-0015B (20 mA vs. 10 mA)?

A: DSSK70-0015B exhibits 20 mA reverse leakage at 15 V, compared to 10 mA for STPS40L15CW. This difference is within normal manufacturing variation for Schottky diodes and does not affect circuit functionality in standard rectification applications. For precision analog circuits or high-impedance applications, evaluate reverse leakage impact through circuit simulation or prototype testing.

Q: Is the extended temperature range (-55 to 150°C) of DSSK70-0015B beneficial?

A: Yes. The extended upper temperature limit (150°C vs. 125°C) allows operation in higher-temperature environments and provides additional thermal margin before reaching maximum junction temperature limits. This is particularly beneficial in applications with elevated ambient temperatures or high-power dissipation scenarios.

Q: What is the part status significance?

A: STPS40L15CW is classified as Obsolete, indicating Vishay has discontinued production and support. DSSK70-0015B is Active, meaning IXYS continues manufacturing and supporting the part. Active status ensures long-term availability, technical support, and supply chain reliability for new designs and field replacements.