40CTQ045STRR Equivalent & Substitute Parts

Part Overview

The 40CTQ045STRR is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 20 A average rectified current per diode. The device is packaged in TO-263-3 (D2PAK) surface mount format with 2 leads plus tab.

The 40CTQ045STRR is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements. Active alternatives with identical or compatible electrical and mechanical specifications are available from multiple manufacturers.

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)	20 A
Voltage - Forward (Vf) (Max) @ If	530 mV @ 20 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	3 mA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°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

Substitute parts for the 40CTQ045STRR are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

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

Secondary Compatibility Parameters:

Current - Average Rectified (Io) (per Diode): 20 A (primary rating) or lower ratings with derating consideration
Voltage - Forward (Vf) (Max) @ If: 530 mV @ 20 A (reference specification)
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io) (mandatory match)
Operating Temperature - Junction: -55°C ~ 150°C (minimum requirement)

Substitute parts are classified into two categories:

Parametric Equivalents: Parts with identical electrical specifications (45 V, 20 A, 530 mV forward voltage) and active product status.

Manufacturer Recommended Alternatives: Parts with compatible but different current ratings (12.5 A, 15 A, 30 A) that maintain the same voltage class and package format. These are suitable for applications where the current requirement is lower than the original specification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating Range)	Product Status	RoHS Status	Package
40CTQ045STRR	Vishay	45 V	20 A	530 mV @ 20 A	3 mA @ 45 V	-55°C ~ 150°C	Obsolete	RoHS non-compliant	TO-263AB
VS-40CTQ045S-M3	Vishay	45 V	20 A	530 mV @ 20 A	3 mA @ 45 V	-55°C ~ 150°C	Active	ROHS3 Compliant	TO-263AB
STPS40L45CG-TR	STMicroelectronics	45 V	20 A	530 mV @ 20 A	600 µA @ 45 V	-55°C ~ 150°C	Active	ROHS3 Compliant	TO-263AB
STPS40L45CGY-TR	STMicroelectronics	45 V	20 A	530 mV @ 20 A	600 µA @ 45 V	-40°C ~ 150°C	Active	ROHS3 Compliant	TO-263AB
STPS41L45CG-TR	STMicroelectronics	45 V	20 A	530 mV @ 20 A	1.2 mA @ 45 V	-55°C ~ 150°C	Active	ROHS3 Compliant	TO-263AB
STPS2545CG-TR	STMicroelectronics	45 V	12.5 A	570 mV @ 12.5 A	125 µA @ 45 V	-55°C ~ 175°C	Active	ROHS3 Compliant	TO-263AB
DSSK28-0045BS-TRL	IXYS	45 V	15 A	480 mV @ 15 A	20 mA @ 45 V	-55°C ~ 150°C	Active	ROHS3 Compliant	TO-263AB
MBRS30H45CT MNG	Taiwan Semiconductor Corporation	45 V	30 A	900 mV @ 30 A	200 µA @ 45 V	-55°C ~ 175°C	Active	ROHS3 Compliant	TO-263AB

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended Primary Substitutes):

The following parts provide identical electrical specifications to the 40CTQ045STRR and are classified as active products with current manufacturing status:

VS-40CTQ045S-M3 (Vishay): Identical specifications with ROHS3 compliance. Same manufacturer as original part. Highest compatibility assurance.
STPS40L45CG-TR (STMicroelectronics): Identical 20 A rating and 530 mV forward voltage. ROHS3 compliant. Cut Tape & Digi-Reel packaging.
STPS40L45CGY-TR (STMicroelectronics): Identical 20 A rating and 530 mV forward voltage. ROHS3 compliant. Automotive grade with AEC-Q101 qualification. Tape & Reel packaging.
STPS41L45CG-TR (STMicroelectronics): Identical 20 A rating and 530 mV forward voltage. ROHS3 compliant. Cut Tape & Digi-Reel packaging.

Alternative Current Ratings (Lower Current Applications):

For applications where the circuit current requirement is lower than 20 A, the following parts provide compatible voltage and package specifications:

STPS2545CG-TR (STMicroelectronics): 12.5 A rating. 45 V voltage class. ROHS3 compliant. Suitable for designs with maximum current draw below 12.5 A per diode.
DSSK28-0045BS-TRL (IXYS): 15 A rating. 45 V voltage class. ROHS3 compliant. Suitable for designs with maximum current draw below 15 A per diode.

Higher Current Rating (Derating Margin):

MBRS30H45CT MNG (Taiwan Semiconductor Corporation): 30 A rating. 45 V voltage class. ROHS3 compliant. Provides additional current margin for designs requiring higher reliability or future scaling.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete 40CTQ045STRR. All parts maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can I use VS-40CTQ045S-M3 as a direct replacement for 40CTQ045STRR?

A: Yes. VS-40CTQ045S-M3 is a parametric equivalent with identical electrical specifications (45 V, 20 A, 530 mV forward voltage) and the same TO-263AB package. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Mechanical and electrical compatibility is complete.

Q: What is the difference between STPS40L45CG-TR and STPS40L45CGY-TR?

A: Both parts have identical electrical specifications (45 V, 20 A, 530 mV forward voltage) and TO-263AB packaging. STPS40L45CGY-TR includes automotive grade qualification (AEC-Q101) and operates over -40°C to 150°C, while STPS40L45CG-TR operates over -55°C to 150°C. STPS40L45CGY-TR is suitable for automotive applications; STPS40L45CG-TR is suitable for industrial and consumer applications.

Q: Can I substitute a 12.5 A part (STPS2545CG-TR) for the 20 A 40CTQ045STRR?

A: Substitution is possible only if the circuit design requires a maximum current below 12.5 A per diode. The 45 V voltage rating and TO-263AB package are compatible. However, if the original design requires 20 A capability, this substitution will result in component overstress and is not suitable.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This configuration contains two diodes within a single package with a shared cathode terminal. The two anodes are independent. This is essential for certain rectifier and protection circuit topologies. All substitute parts maintain this configuration.

Q: Are all substitute parts available in the same TO-263AB package?

A: Yes. All substitute parts listed use the TO-263-3 (D2PAK) package format with 2 leads plus tab. Mechanical compatibility with existing PCB layouts is maintained. Packaging variations (Cut Tape, Tape & Reel, Tube) do not affect electrical or mechanical fit.

Q: What is the significance of reverse leakage current differences between parts?

A: Reverse leakage current (measured at maximum reverse voltage) indicates the quality of the diode junction. Lower leakage current generally indicates better junction quality. The 40CTQ045STRR specifies 3 mA @ 45 V. Substitute parts range from 600 µA to 20 mA. These differences are within acceptable engineering tolerances for Schottky diode technology and do not affect functional compatibility in standard rectifier applications.

Q: Why is RoHS compliance important for this substitution?

A: RoHS (Restriction of Hazardous Substances) compliance is a regulatory requirement in many markets. The original 40CTQ045STRR is RoHS non-compliant. All substitute parts are ROHS3 compliant, ensuring compliance with current environmental regulations and enabling use in regulated markets and applications.

Q: Can I use MBRS30H45CT MNG (30 A) in place of 40CTQ045STRR (20 A)?

A: Yes. The 30 A part is electrically compatible with the 45 V voltage class and TO-263AB package. Using a higher-rated component provides additional current margin and reliability. However, the forward voltage specification differs (900 mV @ 30 A vs. 530 mV @ 20 A), which may affect circuit performance in applications sensitive to voltage drop. Verify circuit behavior before implementation.

Q: What does "Fast Recovery ≤ 500 ns" mean?

A: Recovery time is the interval required for a diode to transition from forward conduction to reverse blocking when the applied voltage reverses. Fast recovery (≤ 500 ns) indicates the diode can switch states quickly, reducing switching losses and enabling use in high-frequency rectification circuits. All substitute parts maintain this specification.

Q: Are there any temperature range differences I should consider?

A: Most substitute parts operate over -55°C to 150°C, matching the original specification. STPS2545CG-TR and MBRS30H45CT MNG extend to 175°C maximum junction temperature, providing additional thermal margin. STPS40L45CGY-TR operates from -40°C (vs. -55°C), which is acceptable for most industrial and automotive applications but may not be suitable for extreme cold environments.

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