Equivalent & Substitute Parts for 25CTQ040 Schottky Diode Array

Part Overview

The 25CTQ040 is a Schottky diode array in a 1 Pair Common Cathode configuration rated for 40 V DC reverse voltage and 15 A average rectified current per diode. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete product status and limited ongoing availability, equivalent substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute components must maintain the same diode configuration, mounting type, and core electrical performance characteristics within specified tolerances.

Substiute Parts

25CTQ040

Vishay General Semiconductor - Diodes DivisionIn Stock: 151925CTQ040 Datasheet

Current PartRFQ

MBR60L45CTG

onsemiIn Stock: 3046MBR60L45CTG Datasheet

MFR RecommendedRFQ

STPS10L40CT

STMicroelectronicsIn Stock: 3632STPS10L40CT Datasheet

MFR RecommendedRFQ

STPS3045CT

STMicroelectronicsIn Stock: 38456STPS3045CT Datasheet

MFR RecommendedRFQ

STPS30L45CT

STMicroelectronicsIn Stock: 5424STPS30L45CT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 25CTQ040 is determined by the following mandatory parameters:

Configuration Requirements:

• Diode configuration must be 1 Pair Common Cathode
• Technology must be Schottky
• Mounting type must be Through Hole
• Package must be TO-220-3

Electrical Performance Requirements:

• Voltage - DC Reverse (Vr) must be equal to or greater than 40 V
• Current - Average Rectified (Io) per diode must be equal to or greater than 15 A
• Speed classification must be Fast Recovery (≤ 500ns, > 200mA)

Acceptable Substitutes: Substitute parts meeting all configuration requirements and electrical performance thresholds are classified as direct equivalents. Parts with higher voltage ratings or current ratings are acceptable as they maintain backward compatibility with the original design specifications. Parts with lower voltage or current ratings are not acceptable substitutes.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: STPS3045CT

The STPS3045CT from STMicroelectronics is the optimal substitute for the 25CTQ040. This part maintains identical current rating (15 A per diode) and exceeds the voltage requirement (45 V vs. 40 V). The STPS3045CT is in active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The maximum junction temperature of 200°C exceeds the original specification, providing enhanced thermal margin.

Secondary Substitute: STPS30L45CT

The STPS30L45CT provides equivalent electrical performance with 15 A current rating and 45 V voltage rating. This part is active and ROHS3 compliant. Forward voltage characteristics (550 mV @ 15 A) are favorable compared to the original specification (560 mV @ 15 A).

Alternative Substitute: MBR60L45CTG

The MBR60L45CTG from onsemi offers enhanced current capability (30 A per diode) with 45 V voltage rating. This part is active and ROHS3 compliant. The higher current rating provides design margin for applications requiring increased current capacity. Maximum junction temperature of 175°C exceeds the original specification.

Not Recommended: STPS10L40CT

The STPS10L40CT has a current rating of only 5 A per diode, which is insufficient for applications requiring the full 15 A capability of the 25CTQ040. This part does not meet the minimum current requirement and is not a suitable substitute.

Frequently Asked Questions (FAQ)

Q: Can the STPS10L40CT be used as a substitute for the 25CTQ040?

A: No. The STPS10L40CT is rated for 5 A average rectified current per diode, which is below the 15 A requirement of the 25CTQ040. Using this part would result in insufficient current capacity and potential component failure.

Q: What is the difference between STPS3045CT and STPS30L45CT?

A: Both parts share the same voltage (45 V) and current (15 A) ratings and are in active status. The primary difference is forward voltage: STPS3045CT is rated at 570 mV @ 15 A while STPS30L45CT is rated at 550 mV @ 15 A. The STPS30L45CT exhibits lower forward voltage drop, resulting in reduced power dissipation.

Q: Why is MBR60L45CTG rated for 30 A when the original part is only 15 A?

A: The MBR60L45CTG is a higher-capacity variant within the same diode array family. The increased current rating (30 A per diode) provides design margin and is fully backward compatible with applications designed for 15 A operation. The part will operate safely at 15 A with reduced thermal stress.

Q: Are all substitute parts in the same TO-220-3 package?

A: Yes. All substitute parts listed are housed in the TO-220-3 package, ensuring mechanical and thermal compatibility with the original 25CTQ040 footprint and mounting requirements.

Q: What is the significance of RoHS3 compliance for these substitutes?

A: RoHS3 compliance indicates that substitute parts meet current environmental and regulatory standards for hazardous substance restrictions. The original 25CTQ040 is RoHS non-compliant, making RoHS3-compliant substitutes necessary for new designs and applications subject to regulatory requirements.

Q: Can I use a substitute part with a higher voltage rating than the original?

A: Yes. Substitute parts with voltage ratings equal to or greater than 40 V are acceptable. Higher voltage ratings provide additional design margin and do not compromise circuit performance in applications designed for 40 V operation.

Q: What is the impact of reverse leakage current differences between parts?

A: Reverse leakage current affects power dissipation and circuit performance at high temperatures. Lower reverse leakage (such as 200 µA in STPS3045CT versus 1.75 mA in 25CTQ040) results in reduced standby power consumption and improved thermal characteristics.