Equivalent & Substitute Parts for 12CTQ045STRL

Part Overview

The 12CTQ045STRL is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration with a maximum reverse voltage of 45 V and an average rectified current of 15 A per diode. The device is housed in a TO-263-3 D2PAK surface mount package with 2 leads plus tab.

The 12CTQ045STRL is classified as obsolete. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode array.

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)	15 A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	1.75 mA @ 45 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
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 12CTQ045STRL is determined by the following critical parameters:

Mandatory Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Mounting Type: Surface Mount
Package / Case: TO-263-3, D2PAK (2 Leads + Tab)

Current Rating Consideration: The 12CTQ045STRL specifies 15 A average rectified current per diode. Substitute parts are grouped based on whether they meet, exceed, or fall below this current specification. Parts with equal or higher current ratings provide direct functional equivalence. Parts with lower current ratings require application-level current derating analysis.

Electrical Performance Parameters: Forward voltage drop, reverse leakage current, and operating temperature range are secondary selection criteria that influence performance characteristics but do not prevent substitution when primary parameters align.

Parameter Comparison

Parameter	12CTQ045STRL	VS-25CTQ045S-M3	DSSK28-0045BS-TRL	STPS1545CG-TR	STPS2545CG-TR	STPS2545CGY-TR
Manufacturer	Vishay	Vishay	IXYS	STMicroelectronics	STMicroelectronics	STMicroelectronics
Diode Configuration	1 Pair Common Cathode	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	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	15 A	15 A	15 A	7.5 A	12.5 A	12.5 A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A	560 mV @ 15 A	480 mV @ 15 A	570 mV @ 7.5 A	570 mV @ 12.5 A	840 mV @ 25 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)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	1.75 mA @ 45 V	1.75 mA @ 45 V	20 mA @ 45 V	100 µA @ 45 V	125 µA @ 45 V	125 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 150°C	175°C (Max)	175°C (Max)	-40°C ~ 175°C
Mounting Type	Surface Mount	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	TO-263-3, D2PAK
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalent:

VS-25CTQ045S-M3 (Vishay) provides parametric equivalence to the 12CTQ045STRL with identical electrical specifications: 45 V reverse voltage, 15 A average rectified current, and 560 mV forward voltage drop at 15 A. This part is active and ROHS3 compliant. The operating temperature range is -55°C to 150°C, which is 25°C lower than the original part at the maximum junction temperature. This part is supplied in Tube packaging.

Full Current Rating Equivalents:

DSSK28-0045BS-TRL (IXYS) matches the 15 A current specification and 45 V reverse voltage rating. This part is active and ROHS3 compliant. Forward voltage is 480 mV at 15 A, which is lower than the original specification. Reverse leakage current is 20 mA at 45 V, higher than the original 1.75 mA. Operating temperature range is -55°C to 150°C. This part is supplied in Tape & Reel packaging.

Reduced Current Rating Alternatives:

STPS2545CG-TR (STMicroelectronics) provides 12.5 A average rectified current, which is 83% of the original 15 A specification. This part is active and ROHS3 compliant with a 175°C maximum junction temperature. Forward voltage is 570 mV at 12.5 A. This part is suitable for applications where the full 15 A current is not required.

STPS2545CGY-TR (STMicroelectronics) is an automotive-grade variant of STPS2545CG-TR with AEC-Q101 qualification. It provides 12.5 A average rectified current and operates across -40°C to 175°C. This part is active and ROHS3 compliant.

STPS1545CG-TR (STMicroelectronics) provides 7.5 A average rectified current, which is 50% of the original specification. This part is active and ROHS3 compliant with a 175°C maximum junction temperature. This part is suitable only for applications with significantly reduced current requirements.

Compliance Consideration:

The 12CTQ045STRL is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, supporting transition to modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can VS-25CTQ045S-M3 be used as a direct replacement for 12CTQ045STRL?

A: VS-25CTQ045S-M3 is a parametric equivalent with matching 45 V reverse voltage, 15 A average rectified current, and 560 mV forward voltage drop. Both parts use identical Schottky technology and TO-263-3 D2PAK packaging. The operating temperature range differs by 25°C at the maximum junction temperature (150°C vs. 175°C). Substitution is valid when the application does not require operation above 150°C junction temperature.

Q: What is the difference between STPS2545CG-TR and STPS2545CGY-TR?

A: Both parts provide 12.5 A average rectified current and 45 V reverse voltage in TO-263-3 D2PAK packaging. STPS2545CGY-TR is an automotive-grade variant with AEC-Q101 qualification and operates across -40°C to 175°C. STPS2545CG-TR has a maximum junction temperature specification of 175°C without explicit automotive qualification. Selection depends on application requirements for automotive-grade components.

Q: Can STPS1545CG-TR replace 12CTQ045STRL in all applications?

A: STPS1545CG-TR provides 7.5 A average rectified current, which is 50% of the 12CTQ045STRL specification. This part is suitable only for applications where the circuit current requirement does not exceed 7.5 A per diode. Applications requiring the full 15 A specification cannot use this part without circuit redesign or parallel device configuration.

Q: Why does DSSK28-0045BS-TRL have higher reverse leakage current than the original part?

A: DSSK28-0045BS-TRL specifies 20 mA reverse leakage current at 45 V, compared to 1.75 mA for the 12CTQ045STRL. This difference reflects manufacturing process variations between IXYS and Vishay. The higher leakage current does not prevent substitution but may affect circuit performance in applications sensitive to reverse leakage, such as precision rectification or low-power standby circuits.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use TO-263-3 D2PAK surface mount packaging with 2 leads plus tab, matching the original 12CTQ045STRL. Packaging variants differ in supplier delivery format: VS-25CTQ045S-M3 is supplied in Tube; DSSK28-0045BS-TRL, STPS1545CG-TR, STPS2545CG-TR, and STPS2545CGY-TR are supplied in Tape & Reel. PCB footprint compatibility is identical across all parts.

Q: What is the significance of RoHS compliance for substitution?

A: The 12CTQ045STRL is RoHS non-compliant, while all substitute parts are ROHS3 compliant. RoHS3 compliance restricts hazardous substances in electrical and electronic equipment. Substitution with ROHS3-compliant parts supports regulatory compliance in new designs and manufacturing processes. Legacy designs using the original part may continue operation without modification, but new production should transition to compliant alternatives.

Q: How do forward voltage specifications differ across substitute parts?

A: Forward voltage specifications vary based on measurement conditions. The 12CTQ045STRL specifies 560 mV at 15 A. VS-25CTQ045S-M3 matches this specification. DSSK28-0045BS-TRL specifies 480 mV at 15 A, indicating lower forward voltage drop. STPS2545CG-TR and STPS2545CGY-TR specify 570 mV at 12.5 A. STPS2545CGY-TR specifies 840 mV at 25 A. Forward voltage differences affect power dissipation and thermal performance in the application circuit.

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