Equivalent & Substitute Parts for 15CTQ045

Part Overview

The 15CTQ045 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode arrangement rated for 45 V DC reverse voltage and 7.5 A average rectified current per diode. The device is packaged in a Through Hole TO-220-3 case and features fast recovery characteristics with a maximum forward voltage of 550 mV at 7.5 A.

The 15CTQ045 is classified as obsolete. Locating equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements. Active alternatives with compatible electrical and mechanical specifications are available from manufacturers including IXYS and STMicroelectronics.

Substiute Parts

15CTQ045

Vishay General Semiconductor - Diodes DivisionIn Stock: 629315CTQ045 Datasheet

Current PartRFQ

DSB60C45PB

IXYSIn Stock: 784DSB60C45PB Datasheet

MFR RecommendedRFQ

STPS1545CT

STMicroelectronicsIn Stock: 1235STPS1545CT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 15CTQ045 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Diode Configuration: 1 Pair Common Cathode
• Technology: Schottky
• Voltage - DC Reverse (Vr) (Max): 45 V
• Mounting Type: Through Hole
• Package / Case: TO-220-3

Allowable Variation Parameters:

• Current - Average Rectified (Io) (per Diode): Equal to or greater than 7.5 A
• Voltage - Forward (Vf) (Max) @ If: Within acceptable circuit operating margins
• Current - Reverse Leakage @ Vr: Within acceptable circuit operating margins
• Operating Temperature - Junction: Equal to or greater than the specified range

Substitute parts must maintain identical diode configuration, Schottky technology, 45 V reverse voltage rating, Through Hole mounting, and TO-220-3 package. Current rating and forward voltage characteristics may exceed the original specification without compromising compatibility. Parts with higher current ratings or lower forward voltage drops provide enhanced performance margins.

Parameter Comparison

Engineering Selection Recommendations

STPS1545CT (STMicroelectronics) is the primary direct substitute for the 15CTQ045. This part maintains identical current rating (7.5 A), voltage rating (45 V), diode configuration (1 Pair Common Cathode), and package (TO-220-3). The STPS1545CT is classified as Active product status, ensuring long-term availability and supply chain stability. The device is ROHS3 compliant, meeting modern environmental and regulatory requirements. Forward voltage is marginally higher at 570 mV versus 550 mV, representing a 20 mV increase within acceptable circuit operating margins. Reverse leakage current is significantly lower at 100 µA compared to 800 µA, providing improved performance characteristics. Maximum junction temperature rating of 175°C exceeds the original specification range.

DSB60C45PB (IXYS) is an alternative substitute with enhanced current handling capability. This part maintains the 45 V voltage rating, 1 Pair Common Cathode configuration, and TO-220-3 package. The DSB60C45PB is rated for 30 A average rectified current, providing a 4× current margin over the original 7.5 A specification. This higher current rating enables use in applications requiring increased power handling without thermal stress. The device is ROHS3 compliant and classified as Active product status. Forward voltage at 630 mV is higher than the original specification, and reverse leakage current at 10 mA is elevated; these characteristics remain within acceptable operating parameters for most circuit applications. The DSB60C45PB is suitable for designs where enhanced current capacity and thermal margin are beneficial.

Both substitute parts are Through Hole mounted in TO-220-3 packages, ensuring mechanical and thermal interface compatibility with the original 15CTQ045 design. Pin configuration and PCB footprint remain identical.

Frequently Asked Questions (FAQ)

Q: Can the STPS1545CT directly replace the 15CTQ045 without circuit modification?

A: Yes. The STPS1545CT maintains identical electrical ratings (45 V, 7.5 A), diode configuration (1 Pair Common Cathode), and package (TO-220-3). Forward voltage difference of 20 mV is negligible in most circuit applications. No circuit modification is required.

Q: What is the advantage of using DSB60C45PB over STPS1545CT?

A: The DSB60C45PB provides 30 A current rating versus 7.5 A, offering a 4× safety margin. This higher rating reduces junction temperature rise and extends device lifetime in high-current applications. Selection depends on circuit current requirements and thermal design considerations.

Q: Are the substitute parts pin-compatible with the 15CTQ045?

A: Yes. Both STPS1545CT and DSB60C45PB are packaged in TO-220-3, maintaining identical pin configuration and PCB footprint with the original 15CTQ045.

Q: Why is the 15CTQ045 classified as obsolete?

A: The 15CTQ045 is no longer manufactured by Vishay General Semiconductor. Active alternatives from IXYS and STMicroelectronics provide equivalent or superior performance with modern compliance certifications.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both STPS1545CT and DSB60C45PB are ROHS3 compliant, meeting current environmental and regulatory requirements. The original 15CTQ045 is RoHS non-compliant.

Q: What is the difference in reverse leakage current between the parts?

A: The 15CTQ045 exhibits 800 µA reverse leakage at 45 V. The STPS1545CT shows 100 µA, and the DSB60C45PB shows 10 mA. Lower leakage current in the STPS1545CT provides superior performance. Higher leakage in the DSB60C45PB remains acceptable for most applications but should be evaluated in low-leakage-sensitive circuits.

Q: Can I use DSB60C45PB in a circuit designed for 7.5 A operation?

A: Yes. The DSB60C45PB is rated for 30 A and operates safely at 7.5 A. The higher current rating provides thermal margin and extended device life. No circuit modification is required.

Q: What is the maximum junction temperature for each part?

A: The 15CTQ045 operates from -55°C to 150°C. The STPS1545CT operates to 175°C maximum. The DSB60C45PB operates from -55°C to 150°C. The STPS1545CT provides the highest temperature margin.