Equivalent & Substitute Parts for 20CTQ035

Part Overview

The 20CTQ035 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode arrangement rated for 35 V DC reverse voltage and 10 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 640 mV at 10 A.

The 20CTQ035 is classified as an obsolete product. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where the original part is no longer readily available from primary sources.

Substiute Parts

20CTQ035

Vishay General Semiconductor - Diodes DivisionIn Stock: 67720CTQ035 Datasheet

Current PartRFQ

MBR2535CTLG

onsemiIn Stock: 1827MBR2535CTLG Datasheet

MFR RecommendedRFQ

STPS2045CT

STMicroelectronicsIn Stock: 25174STPS2045CT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 20CTQ035 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Diode configuration must be 1 Pair Common Cathode
• Technology must be Schottky
• Voltage - DC Reverse (Vr) must be equal to or greater than 35 V
• Current - Average Rectified (Io) per diode must be equal to or greater than 10 A
• Speed must be Fast Recovery ≤ 500ns, > 200mA (Io)
• Mounting type must be Through Hole
• Package / Case must be TO-220-3

Substitute Parts Identified:

MBR2535CTLG (onsemi): Meets all primary substitution criteria. Voltage rating is 35 V (equal), current rating is 12.5 A (exceeds 10 A requirement), and package is TO-220-3. Product status is Active.

STPS2045CT (STMicroelectronics): Meets all primary substitution criteria. Voltage rating is 45 V (exceeds 35 V requirement), current rating is 10 A (equal), and package is TO-220-3. Product status is Active.

Parameter Comparison

Engineering Selection Recommendations

MBR2535CTLG Selection Rationale:

The MBR2535CTLG is an Active product with ROHS3 compliance, providing direct electrical compatibility with the 20CTQ035. The part maintains the 35 V voltage rating while offering increased current capacity at 12.5 A, providing design margin above the original 10 A specification. Forward voltage is reduced to 470 mV at 12.5 A, indicating improved efficiency characteristics. The extended lower operating temperature range (-65°C) provides additional thermal margin for cold-environment applications. This substitute is suitable for applications requiring strict compliance with modern environmental regulations.

STPS2045CT Selection Rationale:

The STPS2045CT is an Active product with ROHS3 compliance, offering elevated voltage rating at 45 V while maintaining the original 10 A current specification. This part is appropriate for applications where circuit voltage margins require higher reverse voltage capability or where system voltage may exceed the original 35 V specification. Forward voltage at 10 A is 570 mV, representing a moderate increase from the original 640 mV specification. This substitute provides design flexibility for voltage-sensitive applications.

Both substitute parts are Active products with current manufacturing support and modern compliance certifications, addressing the obsolescence status of the original 20CTQ035.

Frequently Asked Questions (FAQ)

Q: Can the MBR2535CTLG be used as a direct replacement for the 20CTQ035?

A: Yes. The MBR2535CTLG maintains identical voltage rating (35 V), exceeds the current requirement (12.5 A vs. 10 A), and uses the same TO-220-3 package. Electrical performance is compatible with the original design.

Q: What is the primary difference between the MBR2535CTLG and STPS2045CT substitutes?

A: The MBR2535CTLG maintains the original 35 V voltage rating with increased current capacity. The STPS2045CT provides elevated voltage rating at 45 V while maintaining the original 10 A current specification. Selection depends on circuit voltage requirements and current demands.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both MBR2535CTLG and STPS2045CT are ROHS3 compliant, whereas the original 20CTQ035 is RoHS non-compliant. This compliance status is relevant for applications subject to environmental regulations.

Q: Do the substitute parts use the same package as the 20CTQ035?

A: Yes. Both MBR2535CTLG and STPS2045CT use the TO-220-3 Through Hole package, ensuring mechanical compatibility with existing PCB layouts and thermal management solutions.

Q: What is the significance of the forward voltage differences between these parts?

A: Forward voltage affects power dissipation and efficiency. The MBR2535CTLG exhibits lower forward voltage (470 mV @ 12.5 A) compared to the original (640 mV @ 10 A), resulting in reduced heat generation. The STPS2045CT shows moderate forward voltage (570 mV @ 10 A), representing improved efficiency over the original specification.

Q: Can the STPS2045CT be used in circuits designed for 35 V operation?

A: Yes. The STPS2045CT is rated for 45 V maximum reverse voltage, which exceeds the 35 V circuit requirement. The part operates safely in 35 V circuits and provides additional voltage margin for transient protection.

Q: What is the product status significance for component selection?

A: Both substitute parts are classified as Active products, indicating current manufacturing support, availability from multiple sources, and ongoing technical support from manufacturers. The original 20CTQ035 is Obsolete, making substitution necessary for new production and long-term supply chain continuity.