Equivalent & Substitute Parts for 19TQ015

Part Overview

The 19TQ015 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 15 V DC reverse voltage and 19 A average rectified current in a Through Hole TO-220AC package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The fast recovery characteristic (≤500 ns, >200 mA) and low forward voltage drop make this diode suitable for high-frequency rectification applications requiring efficient power conversion.

Substiute Parts

19TQ015

Vishay General Semiconductor - Diodes DivisionIn Stock: 1520819TQ015 Datasheet

Current PartRFQ

DSS20-0015B

IXYSIn Stock: 2953DSS20-0015B Datasheet

MFR RecommendedRFQ

STPS20L15D

Vishay General Semiconductor - Diodes DivisionIn Stock: 1972STPS20L15D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 19TQ015 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain the 15 V DC reverse voltage specification to ensure circuit protection and reliability.

Current Rating: Substitute parts must support a minimum average rectified current of 19 A. Parts with higher current ratings (20 A) are acceptable as they provide equivalent or superior performance within the same voltage class.

Package Type: All substitutes must use the Through Hole TO-220AC package to ensure mechanical and thermal compatibility with existing PCB layouts and heat sink mounting arrangements.

Technology: All substitutes must employ Schottky diode technology to maintain the fast recovery characteristic and low forward voltage drop required for the application.

Speed Characteristic: All substitutes must meet the fast recovery specification (≤500 ns, >200 mA) to preserve switching performance in high-frequency rectification circuits.

The two identified substitute parts—DSS20-0015B (IXYS) and STPS20L15D (Vishay)—meet all these criteria while offering improved current ratings and, in the case of DSS20-0015B, active product status with RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

For New Designs and Active Production:

The DSS20-0015B (IXYS) is the primary recommended substitute for the 19TQ015. This part offers active product status, ensuring long-term availability and supply chain stability. The DSS20-0015B provides a 20 A current rating, exceeding the original 19 A specification, and extends the operating temperature range to -55°C ~ 150°C. Critically, the DSS20-0015B carries ROHS3 compliance, meeting current environmental and regulatory requirements for electronic components in most markets. The slightly elevated forward voltage (450 mV @ 20 A compared to 360 mV @ 19 A) and reverse leakage current (10 mA versus 1.5 mA) remain within acceptable operating parameters for standard rectification applications.

For Legacy System Maintenance:

The STPS20L15D (Vishay) serves as a secondary substitute option. While this part shares the same manufacturer as the original 19TQ015, it carries obsolete product status. The STPS20L15D provides a 20 A current rating and maintains the -55°C ~ 125°C temperature range consistent with the original specification. The forward voltage characteristic (410 mV @ 19 A) falls between the original part and the DSS20-0015B, offering a moderate performance profile. However, this part does not carry RoHS3 compliance and shares the same supply chain limitations as the original 19TQ015 due to its obsolete status.

Compliance Considerations:

Organizations subject to RoHS3 regulations should prioritize the DSS20-0015B. Both the 19TQ015 and STPS20L15D are RoHS non-compliant and may face restrictions in certain markets or applications requiring environmental compliance certification.

Frequently Asked Questions (FAQ)

Q: Can the DSS20-0015B directly replace the 19TQ015 without circuit modifications?

A: Yes. The DSS20-0015B maintains the same 15 V reverse voltage rating, TO-220AC package configuration, and fast recovery speed characteristic. The 20 A current rating exceeds the original 19 A specification, providing design margin. The forward voltage increase (450 mV versus 360 mV) results in minimal additional power dissipation in typical rectification circuits and does not require circuit redesign.

Q: What is the significance of the reverse leakage current difference between the 19TQ015 (1.5 mA) and substitute parts (10 mA)?

A: The reverse leakage current represents the small current flowing through the diode when reverse-biased. The increase from 1.5 mA to 10 mA in substitute parts is within normal manufacturing variation for Schottky diodes and does not impact circuit functionality in standard rectification applications. Applications with stringent leakage requirements should conduct thermal and electrical analysis to confirm acceptability.

Q: Why does the DSS20-0015B have a higher operating temperature range (-55°C ~ 150°C) compared to the original 19TQ015 (-55°C ~ 125°C)?

A: The extended upper temperature limit reflects the thermal design and manufacturing process of the IXYS part. This extended range provides additional design margin for applications operating in elevated ambient or high-power conditions, though it does not require circuit modification for standard use cases.

Q: Is the STPS20L15D a viable substitute if the DSS20-0015B is unavailable?

A: The STPS20L15D meets all electrical and mechanical substitution criteria and functions as a direct replacement. However, both the STPS20L15D and the original 19TQ015 carry obsolete product status, limiting long-term availability. For applications requiring sustained production support, the DSS20-0015B remains the preferred choice.

Q: What is the impact of RoHS3 compliance on component selection?

A: RoHS3 compliance is a regulatory requirement in many markets, particularly for products sold in the European Union and regions adopting equivalent standards. The DSS20-0015B's ROHS3 compliance eliminates potential market access restrictions and simplifies supply chain documentation. The 19TQ015 and STPS20L15D, both RoHS non-compliant, may face restrictions in regulated markets.

Q: Are there thermal management differences between the 19TQ015 and substitute parts?

A: All three parts use the TO-220-2 package, which provides identical mechanical mounting and thermal interface characteristics. Thermal performance depends on forward voltage dissipation and junction temperature rise. The DSS20-0015B's higher forward voltage (450 mV @ 20 A) generates slightly more heat than the original part, but the extended temperature rating accommodates this characteristic. Thermal analysis should be conducted for high-power applications.

Q: Can the substitute parts be used in parallel with the original 19TQ015?

A: Parallel operation of different diode types is not recommended due to differences in forward voltage characteristics and reverse leakage currents. Unequal current distribution and thermal stress may result. Complete replacement with a single substitute part is the correct approach.