15CTQ035 Equivalent & Substitute Parts

Part Overview

The 15CTQ035 is a Schottky diode array in a 1 Pair Common Cathode configuration manufactured by Vishay General Semiconductor - Diodes Division. This component is rated for 35 V DC reverse voltage with 7.5 A average rectified current per diode and features fast recovery characteristics suitable for high-frequency switching applications. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	35 V
Current - Average Rectified (Io) (per Diode)	7.5 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 7.5 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole
Package / Case	TO-220-3
Operating Temperature - Junction	-55°C ~ 150°C

Substitute Part Grouping Explanation

Substitution of the 15CTQ035 is determined by the following critical parameters: diode configuration (1 Pair Common Cathode), technology (Schottky), mounting type (Through Hole), and package type (TO-220-3). The substitute parts must maintain electrical compatibility within the application's voltage and current requirements.

The MBR2535CTLG and STPS1545CT both satisfy the core mechanical and functional requirements. The MBR2535CTLG provides enhanced current capacity (12.5 A versus 7.5 A) while maintaining the 35 V voltage rating. The STPS1545CT maintains the 7.5 A current rating but increases the voltage rating to 45 V, providing additional design margin in higher-voltage applications.

Parameter Comparison

Parameter	15CTQ035	MBR2535CTLG	STPS1545CT
Manufacturer	Vishay General Semiconductor - Diodes Division	onsemi	STMicroelectronics
Product Status	Obsolete	Active	Active
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	35 V	35 V	45 V
Current - Average Rectified (Io) (per Diode)	7.5 A	12.5 A	7.5 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 7.5 A	470 mV @ 12.5 A	570 mV @ 7.5 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	800 µA @ 35 V	5 mA @ 35 V	100 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 150°C	-55°C to 175°C (Max)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MBR2535CTLG (onsemi): This substitute is suitable for applications requiring the original 35 V rating with increased current capacity. The part is active in production and ROHS3 compliant, addressing environmental and regulatory requirements. The lower forward voltage (470 mV @ 12.5 A) compared to the original part reduces power dissipation. This option is appropriate for designs where current headroom is beneficial.

STPS1545CT (STMicroelectronics): This substitute maintains the original 7.5 A current rating while providing a higher 45 V voltage rating. The part is active in production and ROHS3 compliant. The elevated maximum junction temperature (175°C) offers thermal design margin. This option is appropriate for applications operating at or near the original voltage specification where additional voltage margin is desired.

Both substitute parts are active products with current manufacturing support and modern compliance certifications, addressing the obsolescence of the original 15CTQ035.

Frequently Asked Questions (FAQ)

Q: Can the MBR2535CTLG replace the 15CTQ035 in all applications?

A: The MBR2535CTLG maintains the same voltage rating (35 V) and diode configuration as the 15CTQ035. The increased current rating (12.5 A versus 7.5 A) is a superset capability. The lower forward voltage reduces power dissipation. Electrical compatibility is established for applications operating within the original 7.5 A specification.

Q: Can the STPS1545CT replace the 15CTQ035 in all applications?

A: The STPS1545CT maintains the same current rating (7.5 A) and diode configuration as the 15CTQ035. The increased voltage rating (45 V versus 35 V) provides additional design margin. Electrical compatibility is established for applications operating at or below the original 35 V specification.

Q: Are the substitute parts pin-compatible with the 15CTQ035?

A: All three parts use the TO-220-3 package with identical pin configurations for 1 Pair Common Cathode diode arrays. Physical and electrical pin compatibility is maintained.

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

A: The 15CTQ035 specifies 550 mV @ 7.5 A. The MBR2535CTLG specifies 470 mV @ 12.5 A, and the STPS1545CT specifies 570 mV @ 7.5 A. Forward voltage varies with current and temperature. Direct comparison at identical operating conditions requires reference to detailed datasheets.

Q: Do the substitute parts meet modern compliance standards?

A: Both the MBR2535CTLG and STPS1545CT are ROHS3 compliant, addressing current environmental regulations. The original 15CTQ035 is RoHS non-compliant. Both substitutes are REACH Unaffected.

Q: What is the reverse leakage current difference?

A: The 15CTQ035 specifies 800 µA @ 35 V. The MBR2535CTLG specifies 5 mA @ 35 V. The STPS1545CT specifies 100 µA @ 45 V. Reverse leakage characteristics differ between manufacturers and voltage ratings.

Q: Are there thermal performance differences?

A: The 15CTQ035 operates from -55°C to 150°C. The MBR2535CTLG operates from -65°C to 150°C. The STPS1545CT operates to a maximum junction temperature of 175°C. Thermal performance depends on package design and die characteristics specific to each manufacturer.

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