Equivalent & Substitute Parts for 40L15CW

Part Overview

The 40L15CW is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component 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 a TO-247-3 through-hole format and is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts are necessary for ongoing design support and production continuity.

Substiute Parts

40L15CW

Vishay General Semiconductor - Diodes DivisionIn Stock: 445540L15CW Datasheet

Current PartRFQ

DSSK70-0015B

IXYSIn Stock: 10248DSSK70-0015B Datasheet

MFR RecommendedRFQ

DSSK80-0025B

IXYSIn Stock: 2181DSSK80-0025B Datasheet

MFR RecommendedRFQ

STPS40L15CW

Vishay General Semiconductor - Diodes DivisionIn Stock: 1262STPS40L15CW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 40L15CW is determined by the following critical parameters:

Primary Substitution Criteria:

• Diode Configuration: 1 Pair Common Cathode (must match exactly)
• Technology: Schottky (must match exactly)
• Voltage - DC Reverse (Vr) (Max): 15 V minimum (equal or higher acceptable)
• Current - Average Rectified (Io) (per Diode): 20 A minimum (equal or higher acceptable)
• Mounting Type: Through Hole (must match)
• Package / Case: TO-247-3 (must match)
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (must match)

Secondary Considerations:

• Product Status: Active status preferred for long-term availability
• RoHS Compliance: ROHS3 Compliant status preferred for regulatory alignment
• Operating Temperature Range: Extended range acceptable if application permits

The substitute parts listed below satisfy the primary substitution criteria. STPS40L15CW maintains identical electrical specifications as the main part. DSSK70-0015B and DSSK80-0025B provide higher current ratings and extended temperature ranges while maintaining compatible voltage and package specifications.

Parameter Comparison

Engineering Selection Recommendations

STPS40L15CW is a direct electrical equivalent to the 40L15CW, maintaining identical voltage, current, and forward voltage specifications. Both components are manufactured by Vishay and share the same TO-247-3 package. However, STPS40L15CW is also classified as obsolete, offering no advantage in long-term availability.

DSSK70-0015B (IXYS) is a functionally compatible substitute that maintains the 15 V reverse voltage rating while providing increased current capacity of 35 A per diode. This component is active and ROHS3 compliant, supporting regulatory requirements and ensuring ongoing availability. The extended operating temperature range to 150°C provides additional thermal margin. Forward voltage increases to 450 mV at 35 A, and reverse leakage increases to 20 mA at 15 V. These parameters remain within acceptable ranges for applications designed for the 40L15CW.

DSSK80-0025B (IXYS) provides the highest current rating at 40 A per diode and elevated reverse voltage rating of 25 V. This component is active and ROHS3 compliant. The increased voltage rating provides additional design margin for applications with voltage transients. Forward voltage reaches 480 mV at 40 A, and reverse leakage reaches 40 mA at 25 V. This substitute is suitable for applications requiring enhanced performance specifications beyond the original 40L15CW ratings.

For new designs and production continuity, DSSK70-0015B is recommended as the primary substitute due to its active status, ROHS3 compliance, and direct voltage compatibility with the 40L15CW. DSSK80-0025B is suitable when elevated voltage or current margins are required.

Frequently Asked Questions (FAQ)

Q: Can STPS40L15CW be used as a direct replacement for 40L15CW?

A: Yes. STPS40L15CW is electrically identical to the 40L15CW, with matching voltage, current, and forward voltage specifications. Both components use the TO-247-3 package and Schottky technology. However, both are classified as obsolete, so STPS40L15CW does not provide improved availability.

Q: What is the primary advantage of DSSK70-0015B over the 40L15CW?

A: DSSK70-0015B maintains the 15 V reverse voltage rating while providing 35 A current capacity compared to 20 A in the 40L15CW. The component is active and ROHS3 compliant, ensuring long-term availability and regulatory compliance. Operating temperature extends to 150°C versus 125°C for the 40L15CW.

Q: Can DSSK80-0025B be used in applications designed for the 40L15CW?

A: Yes. DSSK80-0025B is compatible with 40L15CW applications. The 25 V reverse voltage rating exceeds the 15 V requirement, and the 40 A current rating exceeds the 20 A requirement. The TO-247-3 package and Schottky technology match the original specification. The higher forward voltage (480 mV at 40 A) and reverse leakage (40 mA at 25 V) must be evaluated within the specific circuit design.

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

A: Yes. All substitute parts use the TO-247-3 through-hole package, ensuring mechanical and electrical compatibility with the original 40L15CW footprint.

Q: What is the difference between TO-247AC and TO-247AD package designations?

A: TO-247AC and TO-247AD are supplier device package designations for the same TO-247-3 case outline. Both designations refer to the identical physical package used in the 40L15CW and substitute parts.

Q: Why is RoHS compliance important for substitute selection?

A: ROHS3 compliance indicates adherence to current regulatory requirements for hazardous substance restrictions. DSSK70-0015B and DSSK80-0025B are ROHS3 compliant, supporting regulatory requirements in applications subject to environmental directives. The 40L15CW and STPS40L15CW are RoHS non-compliant and may not be suitable for new designs in regulated markets.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage differences between substitute parts affect voltage drop across the diode during conduction. The 40L15CW specifies 410 mV at 20 A, while DSSK70-0015B specifies 450 mV at 35 A and DSSK80-0025B specifies 480 mV at 40 A. Circuit designs must account for these differences in power dissipation and thermal management calculations.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This configuration contains two diodes within a single package with a shared cathode terminal. The common cathode connection allows both diodes to be used in parallel or in complementary switching applications. All substitute parts maintain this identical configuration.