12CTQ035S Equivalent & Substitute Parts

Part Overview

The 12CTQ035S is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode arrangement in a TO-263-3 (D2PAK) surface mount package. This component is rated for 35 V DC reverse voltage and 6 A average rectified current per diode, with a maximum forward voltage of 600 mV at 6 A. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement needs.

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)	6 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 6 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	800 µA @ 35 V
Operating Temperature - Junction	-55°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 12CTQ035S is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 35 V minimum
Current - Average Rectified (Io) (per Diode): 6 A minimum
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type: Surface Mount

Substitute parts are classified into two categories:

Parametric Equivalents: Parts that match all critical electrical parameters (35 V, 6 A) and mechanical specifications, with identical or superior performance characteristics. These parts are direct replacements with no design modifications required.

Manufacturer Recommended Substitute: Parts that exceed the original specifications in voltage and current ratings while maintaining the same package and configuration. These parts provide enhanced performance margins and are suitable for applications where the original part specifications are met or exceeded.

Parameter Comparison

Parameter	12CTQ035S	VS-12CTQ035STRL-M3	VS-12CTQ035STRR-M3	STPS1545CG-TR
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	STMicroelectronics
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	35 V	35 V	35 V	45 V
Current - Average Rectified (Io) (per Diode)	6 A	6 A	6 A	7.5 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 6 A	600 mV @ 6 A	600 mV @ 6 A	570 mV @ 7.5 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)
Current - Reverse Leakage @ Vr	800 µA @ 35 V	800 µA @ 35 V	800 µA @ 35 V	100 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	175°C (Max)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

VS-12CTQ035STRL-M3 and VS-12CTQ035STRR-M3: These Vishay components are parametric equivalents to the 12CTQ035S, providing identical electrical specifications across all critical parameters. Both parts are active products with ROHS3 compliance, addressing the RoHS non-compliance status of the original part. The primary distinction between these two equivalents is packaging format: VS-12CTQ035STRL-M3 is supplied in Tape & Reel format with 8803 units in stock, while VS-12CTQ035STRR-M3 is also supplied in Tape & Reel format with 1119 units in stock. Selection between these two should be based on procurement volume requirements and supply chain availability.

STPS1545CG-TR: This STMicroelectronics component is a manufacturer-recommended substitute that exceeds the original 12CTQ035S specifications. The STPS1545CG-TR provides enhanced voltage rating (45 V versus 35 V) and increased current capacity (7.5 A versus 6 A per diode), while maintaining the same TO-263-3 D2PAK package configuration. The forward voltage is reduced to 570 mV at 7.5 A, and reverse leakage current is significantly lower at 100 µA at 45 V. This part is ROHS3 compliant and active in production with 7250 units in stock. The STPS1545CG-TR is suitable for applications where the original specifications are met or exceeded, providing additional design margin and improved performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can VS-12CTQ035STRL-M3 and VS-12CTQ035STRR-M3 be used interchangeably with 12CTQ035S?

A: Yes. Both parts are parametric equivalents with identical electrical specifications (35 V, 6 A, 600 mV forward voltage, 800 µA reverse leakage). They share the same TO-263-3 D2PAK package and diode configuration. The difference between these two Vishay parts is packaging format; both are supplied in Tape & Reel. Selection should be based on procurement volume and inventory availability.

Q: Is the STPS1545CG-TR a direct replacement for 12CTQ035S?

A: The STPS1545CG-TR is a manufacturer-recommended substitute that exceeds the original specifications. It provides higher voltage (45 V) and current (7.5 A) ratings in the same TO-263-3 D2PAK package. While it is not a parametric equivalent, it is suitable for applications where the original part specifications are met or exceeded, offering enhanced performance margins.

Q: What is the difference between the packaging formats of the substitute parts?

A: The 12CTQ035S was supplied in bulk packaging. The substitute parts VS-12CTQ035STRL-M3, VS-12CTQ035STRR-M3, and STPS1545CG-TR are all supplied in Tape & Reel (TR) format, which is standard for automated assembly processes. The component specifications and performance remain identical; only the delivery and handling format differs.

Q: Are all substitute parts RoHS compliant?

A: Yes. VS-12CTQ035STRL-M3, VS-12CTQ035STRR-M3, and STPS1545CG-TR are all ROHS3 compliant. The original 12CTQ035S is RoHS non-compliant, making the substitute parts necessary for applications requiring RoHS compliance.

Q: Can the STPS1545CG-TR be used in circuits designed for 35 V operation?

A: Yes. The STPS1545CG-TR is rated for 45 V maximum reverse voltage, which exceeds the 35 V requirement of the original design. The component will operate within specification in circuits designed for 35 V operation. The increased voltage rating provides additional design margin without affecting circuit functionality.

Q: What are the key electrical parameters that determine substitutability?

A: Substitutability is determined by diode configuration (1 Pair Common Cathode), technology (Schottky), voltage rating (minimum 35 V), current rating (minimum 6 A per diode), and package type (TO-263-3 D2PAK). All substitute parts meet or exceed these parameters. Forward voltage, reverse leakage current, and operating temperature range are secondary parameters that may vary between parts while maintaining functional compatibility.

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