Equivalent & Substitute Parts for 12CTQ045 Schottky Diode Array

Part Overview

The 12CTQ045 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode arrangement rated for 45 V DC reverse voltage and 6 A average rectified current per diode. This component is packaged in a Through Hole TO-220-3 configuration and features fast recovery characteristics suitable for high-frequency rectification applications.

The 12CTQ045 has reached obsolete product status. Equivalent and substitute parts are available from active manufacturers to maintain design continuity and ensure supply chain reliability for applications requiring Schottky diode array functionality within the specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io) (per Diode)	6	A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 6 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	800	µA @ 45 V
Operating Temperature - Junction	-55 to 175	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the 12CTQ045 Schottky diode array is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Diode configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage rating: 45 V DC reverse (Vr) maximum
Package type: TO-220-3 Through Hole
Speed classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variation Parameters:

Current - Average Rectified (Io): Equal to or greater than 6 A per diode
Voltage - Forward (Vf): Equal to or less than 600 mV at rated current
Current - Reverse Leakage: Equal to or less than 800 µA at 45 V
Operating Temperature - Junction: Equal to or greater than the specified range

Substitute parts must maintain identical diode configuration, technology, voltage rating, and package type. Current capacity, forward voltage, and leakage current may be improved (lower leakage, lower forward voltage, or higher current capacity) without affecting circuit compatibility. Operating temperature range may be extended.

Parameter Comparison

Parameter	12CTQ045 (Vishay)	STPS1545CT (STMicroelectronics)	STPS2545CT (STMicroelectronics)	12CTQ045 (SMC Diode Solutions)
Manufacturer	Vishay General Semiconductor	STMicroelectronics	STMicroelectronics	SMC Diode Solutions
Product Status	Obsolete	Active	Active	Active
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)	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	6 A	7.5 A	12.5 A	6 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 6 A	570 mV @ 7.5 A	570 mV @ 12.5 A	600 mV @ 6 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	800 µA @ 45 V	100 µA @ 45 V	125 µA @ 45 V	800 µA @ 45 V
Operating Temperature - Junction	-55°C to 175°C	175°C (Max)	175°C (Max)	-55°C to 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

STPS1545CT (STMicroelectronics): This substitute part is an active product with ROHS3 compliance. It maintains the 45 V voltage rating and 1 Pair Common Cathode configuration while providing 7.5 A current capacity, exceeding the 6 A requirement of the original 12CTQ045. Forward voltage is reduced to 570 mV at 7.5 A, and reverse leakage current is significantly lower at 100 µA. This part is suitable for applications where improved performance characteristics and regulatory compliance are required.

STPS2545CT (STMicroelectronics): This substitute part is an active product with ROHS3 compliance. It maintains the 45 V voltage rating and 1 Pair Common Cathode configuration while providing 12.5 A current capacity. Forward voltage is 570 mV at 12.5 A, and reverse leakage current is 125 µA. This part is suitable for applications requiring higher current capacity or where thermal performance improvements are beneficial.

12CTQ045 (SMC Diode Solutions): This parametric equivalent maintains identical electrical specifications to the original Vishay part: 6 A current capacity, 600 mV forward voltage at 6 A, and 800 µA reverse leakage current. It is an active product with ROHS3 compliance and identical operating temperature range (-55°C to 175°C). This part provides direct functional equivalence with improved product status and regulatory compliance.

Selection between these substitutes depends on application requirements: the SMC Diode Solutions part provides direct parametric equivalence, while the STMicroelectronics parts offer enhanced performance characteristics with higher current capacity and lower leakage current.

Frequently Asked Questions (FAQ)

Q: Can the STPS1545CT or STPS2545CT be used as direct replacements for the 12CTQ045?

A: Yes. Both STMicroelectronics parts maintain the critical parameters: 45 V voltage rating, 1 Pair Common Cathode configuration, Schottky technology, TO-220-3 package, and fast recovery speed. The higher current ratings (7.5 A and 12.5 A respectively) and lower forward voltage characteristics are compatible with circuits designed for the 6 A rated 12CTQ045.

Q: What is the difference between the STPS1545CT and STPS2545CT?

A: The primary difference is current capacity: STPS1545CT is rated for 7.5 A per diode, while STPS2545CT is rated for 12.5 A per diode. Both maintain 45 V voltage rating and identical forward voltage of 570 mV at their respective rated currents. The STPS2545CT provides higher current handling capability for applications requiring greater power dissipation capacity.

Q: Is the SMC Diode Solutions 12CTQ045 identical to the original Vishay part?

A: The SMC Diode Solutions 12CTQ045 is a parametric equivalent with identical electrical specifications: 6 A current capacity, 600 mV forward voltage at 6 A, 800 µA reverse leakage current, and -55°C to 175°C operating temperature range. It differs in product status (active versus obsolete) and RoHS compliance (ROHS3 compliant). Mechanical compatibility is maintained through identical TO-220-3 packaging.

Q: Are all substitute parts RoHS compliant?

A: The STPS1545CT and STPS2545CT from STMicroelectronics are ROHS3 compliant. The SMC Diode Solutions 12CTQ045 is also ROHS3 compliant. The original Vishay 12CTQ045 is RoHS non-compliant. All substitute parts meet current regulatory requirements.

Q: Does the TO-220-3 package remain the same across all parts?

A: Yes. All parts, including the original 12CTQ045 and all substitutes, use the TO-220-3 Through Hole package. Mechanical mounting and thermal interface characteristics are compatible across all listed parts.

Q: What is the significance of lower reverse leakage current in the STMicroelectronics parts?

A: The STPS1545CT and STPS2545CT exhibit reverse leakage currents of 100 µA and 125 µA respectively, compared to 800 µA in the original 12CTQ045. Lower reverse leakage reduces standby power consumption and heat generation in applications with sustained reverse bias conditions. This is an improvement that does not affect circuit compatibility.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, within the constraints of the application. All substitute parts maintain the 45 V voltage rating, 1 Pair Common Cathode configuration, and TO-220-3 package. Applications designed for 6 A operation can use any of the listed parts. Applications requiring higher current capacity should use STPS1545CT (7.5 A) or STPS2545CT (12.5 A). Thermal design considerations may change due to improved efficiency characteristics in the STMicroelectronics parts.

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