Equivalent & Substitute Parts for 12CTQ045S

Part Overview

The Vishay 12CTQ045S is a Schottky diode array featuring one pair of common cathode configuration rated for 45V DC reverse voltage and 15A average rectified current per diode. This component is packaged in a TO-263-3 (D2PAK) surface mount package with two leads plus tab configuration. The 12CTQ045S is classified as obsolete product status, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter variations for the application.

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)	15	A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	1.75	mA @ 45 V
Operating Temperature - Junction	-55 to 175	°C
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the 12CTQ045S is determined by the following critical parameters: diode configuration (1 Pair Common Cathode), technology (Schottky), reverse voltage rating (45V), average rectified current per diode, forward voltage characteristics, fast recovery speed classification, and surface mount packaging in TO-263-3 D2PAK format.

Substitute parts are grouped into two categories:

Parametric Equivalents (Vishay VS-25CTQ045 Series): These parts maintain identical electrical specifications to the 12CTQ045S including 45V reverse voltage, 15A average rectified current, 560 mV forward voltage at 15A, and fast recovery characteristics. The VS-25CTQ045STRL-M3 and VS-25CTQ045STRR-M3 differ only in tape and reel configuration and represent active product alternatives with RoHS3 compliance. Operating temperature range is -55°C to 150°C, which is within the original specification envelope.

Manufacturer Recommended Alternatives: These parts maintain the 45V reverse voltage and 1 Pair Common Cathode configuration but vary in average rectified current capacity, forward voltage characteristics, or operating temperature range. The DSSK28-0045BS-TRL (IXYS) provides 15A current rating with improved forward voltage (480 mV @ 15A) but exhibits higher reverse leakage (20 mA @ 45V). The STMicroelectronics STPS series (STPS1545CG-TR, STPS2545CG-TR, STPS2545CGY-TR) offer reduced current ratings (7.5A to 12.5A) or modified forward voltage specifications but maintain 45V reverse voltage and D2PAK packaging. The STPS2545CGY-TR includes automotive qualification (AEC-Q101) and extended operating temperature range (-40°C to 175°C).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Vr (Max) [V]	Io per Diode [A]	Vf (Max) [mV]	Reverse Leakage [mA @ 45V]	Tj Operating Range [°C]	Package	RoHS Status
12CTQ045S	Vishay	Obsolete	45	15	560 @ 15A	1.75	-55 to 175	TO-263-3 D2PAK	Non-compliant
VS-25CTQ045STRL-M3	Vishay	Active	45	15	560 @ 15A	1.75	-55 to 150	TO-263-3 D2PAK	RoHS3 Compliant
VS-25CTQ045STRR-M3	Vishay	Active	45	15	560 @ 15A	1.75	-55 to 150	TO-263-3 D2PAK	RoHS3 Compliant
DSSK28-0045BS-TRL	IXYS	Active	45	15	480 @ 15A	20	-55 to 150	TO-263-3 D2PAK	RoHS3 Compliant
STPS1545CG-TR	STMicroelectronics	Active	45	7.5	570 @ 7.5A	0.1	-55 to 175	TO-263-3 D2PAK	RoHS3 Compliant
STPS2545CG-TR	STMicroelectronics	Active	45	12.5	570 @ 12.5A	0.125	-55 to 175	TO-263-3 D2PAK	RoHS3 Compliant
STPS2545CGY-TR	STMicroelectronics	Active	45	12.5	840 @ 25A	0.125	-40 to 175	TO-263-3 D2PAK	RoHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents): The VS-25CTQ045STRL-M3 and VS-25CTQ045STRR-M3 are parametric equivalents of the 12CTQ045S, maintaining identical electrical performance across all critical specifications. Both parts are active products with RoHS3 compliance, addressing regulatory requirements for new designs. Selection between these two Vishay alternatives depends on packaging format: STRL-M3 designates left-hand tape orientation while STRR-M3 designates right-hand tape orientation. The operating temperature range of -55°C to 150°C is suitable for applications within this envelope.

Functional Alternatives with Current Derating: The STPS2545CG-TR and STPS2545CGY-TR from STMicroelectronics provide 12.5A average rectified current per diode, representing an 83% current rating relative to the 12CTQ045S. These parts maintain 45V reverse voltage and D2PAK packaging. The STPS2545CGY-TR includes automotive qualification (AEC-Q101) and extended operating temperature range (-40°C to 175°C), suitable for automotive and industrial applications. The STPS1545CG-TR provides 7.5A current rating and is applicable only to applications with reduced current requirements.

Alternative with Improved Forward Voltage: The DSSK28-0045BS-TRL from IXYS maintains 15A current rating and 45V reverse voltage but exhibits improved forward voltage (480 mV @ 15A versus 560 mV @ 15A). This part is suitable for applications where reduced power dissipation is beneficial. Higher reverse leakage current (20 mA @ 45V versus 1.75 mA @ 45V) must be evaluated against application requirements.

All recommended substitute parts are active products with RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original component's handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the VS-25CTQ045STRL-M3 or VS-25CTQ045STRR-M3 be used as direct replacements for the 12CTQ045S?

A: Yes. Both Vishay parts are parametric equivalents with identical electrical specifications: 45V reverse voltage, 15A average rectified current per diode, 560 mV forward voltage at 15A, and fast recovery characteristics. Both are packaged in TO-263-3 D2PAK format with identical pinout. The difference between STRL-M3 and STRR-M3 relates to tape reel orientation and does not affect electrical performance or PCB assembly compatibility.

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

A: Both parts provide 12.5A average rectified current and 45V reverse voltage in D2PAK packaging. The STPS2545CGY-TR includes automotive qualification (AEC-Q101) and operates across -40°C to 175°C, while the STPS2545CG-TR operates across -55°C to 175°C. The STPS2545CGY-TR exhibits higher forward voltage (840 mV @ 25A) compared to the STPS2545CG-TR (570 mV @ 12.5A), indicating different thermal and electrical characteristics. Selection depends on application requirements for automotive qualification and operating temperature range.

Q: Why does the DSSK28-0045BS-TRL show lower forward voltage than the 12CTQ045S?

A: The DSSK28-0045BS-TRL exhibits 480 mV forward voltage at 15A compared to 560 mV for the 12CTQ045S. This represents improved efficiency and reduced power dissipation in the diode. However, the DSSK28-0045BS-TRL exhibits higher reverse leakage current (20 mA @ 45V versus 1.75 mA @ 45V), which must be evaluated for applications sensitive to leakage current.

Q: Can I use the STPS1545CG-TR or STPS2545CG-TR if my application requires 15A current?

A: The STPS1545CG-TR provides 7.5A and the STPS2545CG-TR provides 12.5A average rectified current per diode. Neither part meets the 15A requirement of the 12CTQ045S. These parts are suitable only for applications with reduced current requirements. For 15A applications, use the VS-25CTQ045STRL-M3, VS-25CTQ045STRR-M3, or DSSK28-0045BS-TRL.

Q: Are all substitute parts RoHS compliant?

A: The 12CTQ045S is RoHS non-compliant. All recommended substitute parts (VS-25CTQ045STRL-M3, VS-25CTQ045STRR-M3, DSSK28-0045BS-TRL, STPS1545CG-TR, STPS2545CG-TR, STPS2545CGY-TR) are RoHS3 compliant, meeting current regulatory requirements for new designs and production.

Q: What is the significance of the D2PAK package designation?

A: D2PAK is the industry standard designation for the TO-263-3 surface mount package with two leads plus tab configuration. All listed parts use this identical package format, ensuring PCB footprint compatibility and assembly process compatibility without modification.

Q: How do I select between tape reel orientations (STRL-M3 versus STRR-M3)?

A: The selection between STRL-M3 (left-hand tape) and STRR-M3 (right-hand tape) depends on your pick-and-place equipment configuration and tape feeder orientation. Both parts are electrically and mechanically identical. Consult your assembly equipment specifications to determine the appropriate tape orientation for your production line.

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