DSB40C15PB Equivalent & Substitute Parts

Part Overview

The DSB40C15PB is a Schottky diode array manufactured by IXYS, configured as a 1 Pair Common Cathode arrangement rated for 15 V DC reverse voltage and 20 A average rectified current per diode. The device is packaged in a Through Hole TO-220-3 case and is currently in Active product status with RoHS3 compliance.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the allowed specifications for this diode array category. The primary substitute identified is the STPS40L15CT from Vishay General Semiconductor - Diodes Division, which shares the same core electrical ratings and package configuration.

Substiute Parts

DSB40C15PB

IXYSIn Stock: 814DSB40C15PB Datasheet

Current PartRFQ

STPS40L15CT

Vishay General Semiconductor - Diodes DivisionIn Stock: 1206STPS40L15CT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DSB40C15PB is determined by the following critical parameters:

1. Diode Configuration: Must be 1 Pair Common Cathode
2. Technology: Must be Schottky
3. Voltage - DC Reverse (Vr) (Max): Must be 15 V
4. Current - Average Rectified (Io) (per Diode): Must be 20 A
5. Mounting Type: Must be Through Hole
6. Package / Case: Must be TO-220-3
7. Speed Classification: Must be Fast Recovery ≤ 500ns, > 200mA (Io)

The STPS40L15CT meets all these core electrical and mechanical requirements, making it a valid substitute for the DSB40C15PB in applications where the specified parameters are required.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: DSB40C15PB (IXYS)

The DSB40C15PB is the recommended primary choice for new designs and applications. It maintains Active product status, ensuring long-term availability and supply chain stability. The device is RoHS3 compliant, meeting current environmental and regulatory requirements. The operating temperature range extends to 150°C, providing thermal margin for high-temperature applications.

Substitute Selection: STPS40L15CT (Vishay)

The STPS40L15CT is electrically equivalent in core parameters and shares the same TO-220-3 package configuration. However, the following differences must be considered:

1. Product Status: The STPS40L15CT is classified as Obsolete, indicating limited future availability and potential supply discontinuation.
2. RoHS Compliance: The STPS40L15CT is RoHS non-compliant, which may restrict use in applications subject to RoHS regulations.
3. Operating Temperature Range: The maximum junction temperature is 125°C, compared to 150°C for the DSB40C15PB, reducing thermal headroom.
4. Reverse Leakage Current: The STPS40L15CT exhibits 10 mA reverse leakage at 15 V, compared to 10 µA for the DSB40C15PB, representing a 1000-fold increase in leakage current.

The STPS40L15CT is suitable only for legacy system maintenance or applications where RoHS compliance is not required and elevated reverse leakage is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the STPS40L15CT be used as a direct replacement for the DSB40C15PB in new designs?

A: The STPS40L15CT is not recommended for new designs. Although it matches the core electrical ratings and package, it is classified as Obsolete and is RoHS non-compliant. The DSB40C15PB is the appropriate choice for new applications.

Q: What is the significance of the reverse leakage current difference between these parts?

A: The DSB40C15PB exhibits 10 µA reverse leakage, while the STPS40L15CT exhibits 10 mA reverse leakage at 15 V. This 1000-fold difference may impact circuit performance in applications sensitive to leakage current, such as precision analog circuits or low-power standby modes.

Q: Are both parts pin-compatible in the TO-220-3 package?

A: Yes. Both the DSB40C15PB and STPS40L15CT use the TO-220-3 package with identical pin configurations for Through Hole mounting. Physical board-level compatibility is maintained.

Q: What is the impact of the operating temperature range difference?

A: The DSB40C15PB supports junction temperatures up to 150°C, while the STPS40L15CT is limited to 125°C. Applications operating near maximum thermal conditions require the DSB40C15PB to ensure reliable operation within specified limits.

Q: Does the forward voltage difference affect circuit design?

A: The DSB40C15PB specifies 480 mV forward voltage at 20 A, while the STPS40L15CT specifies 410 mV at 19 A. The lower forward voltage of the STPS40L15CT may reduce power dissipation in rectification applications, but the measurement conditions differ slightly. Circuit designs should be validated for the specific part selected.

Q: Is the STPS40L15CT available for purchase?

A: The STPS40L15CT is classified as Obsolete. While inventory may exist from distributors, future availability is not guaranteed. The DSB40C15PB is the recommended alternative for continued supply assurance.