15CTQ045STRL Equivalent & Substitute Parts

Part Overview

The 15CTQ045STRL is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 7.5 A average rectified current per diode. The device is packaged in a Surface Mount TO-263-3 (D2PAK) format with 2 leads plus tab.

The 15CTQ045STRL is classified as an obsolete product. Identification of equivalent and substitute parts is necessary to support ongoing maintenance, repair, and redesign activities for systems utilizing this component. Substitute parts must maintain electrical compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io) (per Diode)	7.5 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 7.5 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	800 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 15CTQ045STRL is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io) (per Diode): 7.5 A minimum
Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Mechanical Compatibility Requirements:

Mounting Type: Surface Mount
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB or equivalent

Compliance Considerations:

RoHS Status: Preference for RoHS3 Compliant alternatives
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories: parametric equivalents that match all electrical specifications, and manufacturer-recommended alternatives that exceed the minimum current rating while maintaining voltage and package compatibility.

Parameter Comparison

Parameter	15CTQ045STRL (Main)	VS-15CTQ045S-M3	STPS1545CG-TR	STPS2545CGY-TR	DSSK28-0045BS-TRL
Manufacturer	Vishay	Vishay	STMicroelectronics	STMicroelectronics	IXYS
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	7.5 A	7.5 A	7.5 A	12.5 A	15 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 7.5 A	550 mV @ 7.5 A	570 mV @ 7.5 A	840 mV @ 25 A	480 mV @ 15 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	800 µA @ 45 V	800 µA @ 45 V	100 µA @ 45 V	125 µA @ 45 V	20 mA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C (Max)	-40°C ~ 175°C	-55°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Not specified	Tube	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Parametric Equivalent - Direct Replacement:

VS-15CTQ045S-M3 is the parametric equivalent substitute for the 15CTQ045STRL. This part maintains identical electrical specifications including 45 V reverse voltage, 7.5 A average rectified current, and 550 mV forward voltage at 7.5 A. The VS-15CTQ045S-M3 is manufactured by Vishay General Semiconductor - Diodes Division and is classified as an Active product with ROHS3 compliance. This part is available in Tube packaging and represents the direct functional replacement.

Manufacturer-Recommended Alternatives:

STPS1545CG-TR (STMicroelectronics) provides electrical equivalence with identical 45 V reverse voltage and 7.5 A current rating. This part is ROHS3 compliant and Active. The forward voltage specification is 570 mV at 7.5 A, which is within acceptable tolerance of the original 550 mV specification. The maximum junction temperature is 175°C, exceeding the original 150°C specification.

STPS2545CGY-TR (STMicroelectronics) offers increased current capacity at 12.5 A while maintaining 45 V reverse voltage compatibility. This part is ROHS3 compliant, Active, and carries AEC-Q101 automotive qualification. The higher current rating provides design margin for applications requiring increased thermal or electrical headroom.

DSSK28-0045BS-TRL (IXYS) provides the highest current capacity at 15 A while maintaining 45 V reverse voltage. This part is ROHS3 compliant and Active. The forward voltage is 480 mV at 15 A, which is lower than the original specification. The reverse leakage current is 20 mA at 45 V, which is higher than the original 800 µA specification.

All substitute parts maintain Surface Mount TO-263-3 (D2PAK) package compatibility and Fast Recovery Schottky technology with identical switching speed characteristics.

Frequently Asked Questions (FAQ)

Q: Can VS-15CTQ045S-M3 be used as a direct replacement for 15CTQ045STRL?

A: Yes. VS-15CTQ045S-M3 is a parametric equivalent with identical electrical specifications. Both parts feature 45 V reverse voltage, 7.5 A average rectified current, 550 mV forward voltage at 7.5 A, and identical package configuration. The primary difference is product status: VS-15CTQ045S-M3 is Active and ROHS3 compliant, while 15CTQ045STRL is Obsolete and RoHS non-compliant.

Q: What is the difference between the substitute parts in terms of current rating?

A: The substitute parts are available in three current ratings: 7.5 A (VS-15CTQ045S-M3 and STPS1545CG-TR), 12.5 A (STPS2545CGY-TR), and 15 A (DSSK28-0045BS-TRL). All maintain 45 V reverse voltage compatibility. Higher current ratings provide increased thermal margin and are suitable for applications with higher power dissipation requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All four substitute parts (VS-15CTQ045S-M3, STPS1545CG-TR, STPS2545CGY-TR, and DSSK28-0045BS-TRL) are ROHS3 compliant. The original 15CTQ045STRL is RoHS non-compliant.

Q: Do all substitute parts use the same package?

A: Yes. All substitute parts use the Surface Mount TO-263-3 (D2PAK) package with 2 leads plus tab, maintaining mechanical and thermal compatibility with the original 15CTQ045STRL.

Q: What is the difference in forward voltage between the substitute parts?

A: Forward voltage specifications vary across substitutes: VS-15CTQ045S-M3 and 15CTQ045STRL both specify 550 mV at 7.5 A; STPS1545CG-TR specifies 570 mV at 7.5 A; STPS2545CGY-TR specifies 840 mV at 25 A; DSSK28-0045BS-TRL specifies 480 mV at 15 A. Forward voltage differences affect power dissipation and thermal performance in the application circuit.

Q: Which substitute part has the lowest reverse leakage current?

A: DSSK28-0045BS-TRL has the lowest reverse leakage current at 20 mA at 45 V. VS-15CTQ045S-M3 and 15CTQ045STRL both specify 800 µA at 45 V. STPS1545CG-TR specifies 100 µA at 45 V, and STPS2545CGY-TR specifies 125 µA at 45 V.

Q: Is STPS2545CGY-TR suitable for automotive applications?

A: STPS2545CGY-TR carries AEC-Q101 automotive qualification and is designated as an Automotive grade component. This qualification indicates compliance with automotive reliability and quality standards.

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

A: VS-15CTQ045S-M3 and DSSK28-0045BS-TRL both specify -55°C to 150°C. STPS1545CG-TR specifies a maximum of 175°C. STPS2545CGY-TR specifies -40°C to 175°C. Higher maximum junction temperatures provide thermal margin in high-temperature operating environments.

Q: Can DSSK28-0045BS-TRL be used in place of 15CTQ045STRL in all applications?

A: DSSK28-0045BS-TRL is mechanically and electrically compatible at the 45 V voltage level and maintains the same package configuration. However, the higher current rating (15 A vs. 7.5 A), lower forward voltage (480 mV vs. 550 mV), and higher reverse leakage current (20 mA vs. 800 µA) must be evaluated against specific application requirements. The part is suitable for applications requiring higher current capacity or lower forward voltage drop.

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