40CTQ045S Equivalent & Substitute Parts

Part Overview

The 40CTQ045S 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 part is packaged in TO-263-3 (D2PAK) surface mount format with 2 leads plus tab.

The 40CTQ045S is classified as obsolete. Equivalent and substitute parts are available from active product lines, offering improved availability and compliance with current regulatory standards including RoHS3 certification.

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 ≤ 500ns, > 200mA (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
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 40CTQ045S are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Vishay Series): Parts VS-40CTQ045S-M3, VS-40CTQ045STRL-M3, and VS-40CTQ045STRR-M3 maintain identical electrical specifications to the 40CTQ045S. These parts differ only in packaging format (Tube, Tape & Reel configurations) and product status (Active vs. Obsolete). All three Vishay equivalents are RoHS3 compliant and feature the same 45 V reverse voltage, 20 A current rating, 530 mV forward voltage drop, and 3 mA reverse leakage current.

Manufacturer Recommended Alternatives: Parts from STMicroelectronics (STPS40L45CG-TR, STPS41L45CG-TR, STPS2545CG-TR) and IXYS (DSSK28-0045BS-TRL) provide functional substitution with variations in current rating and reverse leakage characteristics. These alternatives maintain the 45 V reverse voltage rating and TO-263-3 D2PAK package format but differ in average rectified current capacity and leakage specifications.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr) (Max): 45 V (required match)
Diode Configuration: 1 Pair Common Cathode (required match)
Technology: Schottky (required match)
Package / Case: TO-263-3, D2PAK (required match)
Mounting Type: Surface Mount (required match)
Current - Average Rectified (Io) (per Diode): 20 A (primary specification; lower ratings acceptable for reduced-current applications)

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Ir @ Vr	Tj (Max)	Product Status	RoHS Status
40CTQ045S	Vishay	45 V	20 A	530 mV @ 20 A	3 mA @ 45 V	150°C	Obsolete	Non-compliant
VS-40CTQ045S-M3	Vishay	45 V	20 A	530 mV @ 20 A	3 mA @ 45 V	150°C	Active	ROHS3 Compliant
VS-40CTQ045STRL-M3	Vishay	45 V	20 A	530 mV @ 20 A	3 mA @ 45 V	150°C	Active	ROHS3 Compliant
VS-40CTQ045STRR-M3	Vishay	45 V	20 A	530 mV @ 20 A	3 mA @ 45 V	150°C	Active	ROHS3 Compliant
STPS40L45CG-TR	STMicroelectronics	45 V	20 A	530 mV @ 20 A	600 µA @ 45 V	150°C	Active	ROHS3 Compliant
STPS41L45CG-TR	STMicroelectronics	45 V	20 A	530 mV @ 20 A	1.2 mA @ 45 V	150°C	Active	ROHS3 Compliant
STPS2545CG-TR	STMicroelectronics	45 V	12.5 A	570 mV @ 12.5 A	125 µA @ 45 V	175°C	Active	ROHS3 Compliant
DSSK28-0045BS-TRL	IXYS	45 V	15 A	480 mV @ 15 A	20 mA @ 45 V	150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents):

The Vishay parts VS-40CTQ045S-M3, VS-40CTQ045STRL-M3, and VS-40CTQ045STRR-M3 are direct parametric equivalents to the 40CTQ045S. These parts maintain identical electrical performance and package specifications. Selection among these three variants depends on procurement packaging requirements: VS-40CTQ045S-M3 is supplied in Tube packaging, while VS-40CTQ045STRL-M3 and VS-40CTQ045STRR-M3 are supplied in Tape & Reel format. All three are RoHS3 compliant and carry Active product status, providing improved long-term availability compared to the obsolete 40CTQ045S.

Alternative Substitutes (Reduced Current Rating):

The STPS2545CG-TR from STMicroelectronics and DSSK28-0045BS-TRL from IXYS are suitable substitutes for applications where the full 20 A current rating is not required. The STPS2545CG-TR is rated for 12.5 A per diode and features a maximum junction temperature of 175°C. The DSSK28-0045BS-TRL is rated for 15 A per diode. Both maintain the 45 V reverse voltage specification and TO-263-3 D2PAK package format. These alternatives are RoHS3 compliant and carry Active product status.

Alternative Substitutes (Full Current Rating):

The STPS40L45CG-TR and STPS41L45CG-TR from STMicroelectronics maintain the 20 A current rating and 45 V reverse voltage specification. Both are packaged in TO-263-3 D2PAK format and are RoHS3 compliant with Active product status. The STPS41L45CG-TR exhibits lower reverse leakage current (1.2 mA @ 45 V) compared to the STPS40L45CG-TR (600 µA @ 45 V), making it more suitable for applications sensitive to leakage characteristics.

Frequently Asked Questions (FAQ)

Q: Can VS-40CTQ045S-M3 be used as a direct replacement for 40CTQ045S?

A: Yes. The VS-40CTQ045S-M3 is a parametric equivalent with identical electrical specifications: 45 V reverse voltage, 20 A average rectified current, 530 mV forward voltage drop, and 3 mA reverse leakage current. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. Non-compliant). Packaging format differs by variant (Tube vs. Tape & Reel).

Q: What is the difference between VS-40CTQ045STRL-M3 and VS-40CTQ045STRR-M3?

A: Both parts are parametric equivalents with identical electrical specifications. The difference is in packaging format: STRL indicates Tape & Reel (Left), while STRR indicates Tape & Reel (Right). Selection depends on automated assembly equipment compatibility and procurement preferences.

Q: Can STPS2545CG-TR replace 40CTQ045S in all applications?

A: The STPS2545CG-TR is suitable only for applications where the current requirement does not exceed 12.5 A per diode. The part maintains the 45 V reverse voltage and TO-263-3 D2PAK package format. Applications requiring the full 20 A rating must use parts rated for 20 A, such as STPS40L45CG-TR, STPS41L45CG-TR, or the Vishay equivalents.

Q: What are the reverse leakage differences among the 20 A rated alternatives?

A: The 40CTQ045S and VS-40CTQ045S-M3 specify 3 mA reverse leakage at 45 V. The STPS41L45CG-TR specifies 1.2 mA at 45 V, while the STPS40L45CG-TR specifies 600 µA at 45 V. Applications with strict leakage requirements should select based on these specifications.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed (VS-40CTQ045S-M3, VS-40CTQ045STRL-M3, VS-40CTQ045STRR-M3, STPS40L45CG-TR, STPS41L45CG-TR, STPS2545CG-TR, and DSSK28-0045BS-TRL) are RoHS3 compliant. The original 40CTQ045S is RoHS non-compliant.

Q: What is the maximum junction temperature for each substitute?

A: The Vishay equivalents (VS-40CTQ045S-M3, VS-40CTQ045STRL-M3, VS-40CTQ045STRR-M3) and most STMicroelectronics parts (STPS40L45CG-TR, STPS41L45CG-TR, DSSK28-0045BS-TRL) specify 150°C maximum junction temperature. The STPS2545CG-TR specifies 175°C maximum junction temperature.

Q: Can these parts be used interchangeably in PCB assembly?

A: All substitute parts use the same TO-263-3 D2PAK package format with identical pin configuration and footprint. PCB layout compatibility is maintained across all listed alternatives. Procurement packaging format (Tube, Tape & Reel) does not affect PCB assembly compatibility.

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