Equivalent & Substitute Parts for 20CTQ045S

Part Overview

The Vishay 20CTQ045S is a Schottky diode array featuring a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 10 A average rectified current per diode. The device is packaged in TO-263-3 (D2PAK) surface mount format with a maximum forward voltage of 640 mV at 10 A and fast recovery characteristics. The 20CTQ045S is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

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)	10 A
Voltage - Forward (Vf) (Max) @ If	640 mV @ 10 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	2 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
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 20CTQ045S is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

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

Allowable Variation Parameters:

Current - Average Rectified (Io) (per Diode): Equal to or greater than 10 A
Voltage - Forward (Vf) (Max) @ If: Within acceptable circuit operating margins
Current - Reverse Leakage @ Vr: Within acceptable circuit operating margins
Operating Temperature - Junction: Must encompass or exceed -55°C ~ 175°C range

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical specifications with different packaging or status) and Manufacturer Recommended Substitutes (enhanced or alternative specifications meeting or exceeding the original part requirements).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	Package	Product Status	RoHS Status
20CTQ045S	Vishay	45 V	10 A	640 mV @ 10 A	2 mA @ 45 V	-55°C ~ 175°C	TO-263AB	Obsolete	RoHS non-compliant
VS-20CTQ045STRL-M3	Vishay	45 V	10 A	640 mV @ 10 A	2 mA @ 45 V	-55°C ~ 175°C	TO-263AB	Active	Not specified
VS-20CTQ045STRR-M3	Vishay	45 V	10 A	640 mV @ 10 A	2 mA @ 45 V	-55°C ~ 175°C	TO-263AB	Active	ROHS3 Compliant
DSSK28-0045BS-TRL	IXYS	45 V	15 A	480 mV @ 15 A	20 mA @ 45 V	-55°C ~ 150°C	TO-263AB	Active	ROHS3 Compliant
MBRS1045CTH	Taiwan Semiconductor Corporation	45 V	10 A	800 mV @ 10 A	100 µA @ 45 V	-55°C ~ 150°C	TO-263AB	Active	ROHS3 Compliant
NRVBB40L45CTT4G	onsemi	45 V	20 A	500 mV @ 20 A	1.2 mA @ 45 V	-65°C ~ 175°C	D2PAK	Active	ROHS3 Compliant
STPS2045CG-TR	STMicroelectronics	45 V	10 A	570 mV @ 10 A	100 µA @ 45 V	-55°C ~ 175°C	D2PAK	Active	ROHS3 Compliant
STPS20L45CG-TR	STMicroelectronics	45 V	10 A	550 mV @ 10 A	200 µA @ 45 V	-55°C ~ 150°C	D2PAK	Active	ROHS3 Compliant
STPS2545CGY-TR	STMicroelectronics	45 V	12.5 A	840 mV @ 25 A	125 µA @ 45 V	-40°C ~ 175°C	D2PAK	Active	ROHS3 Compliant
STPS41L45CG-TR	STMicroelectronics	45 V	20 A	530 mV @ 20 A	1.2 mA @ 45 V	-55°C ~ 150°C	D2PAK	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalents (Identical Specifications):

The VS-20CTQ045STRR-M3 from Vishay is the direct parametric equivalent to the 20CTQ045S. This part maintains identical electrical specifications (45 V, 10 A, 640 mV forward voltage) and package configuration while offering Active product status and ROHS3 compliance. This part is the primary recommendation for direct replacement in existing designs.

The VS-20CTQ045STRL-M3 is also a parametric equivalent with identical electrical specifications and Active status, differing only in packaging format (Tape & Reel).

Active Substitutes with Matching Current Rating (10 A):

The STPS2045CG-TR and STPS20L45CG-TR from STMicroelectronics both maintain the 45 V reverse voltage and 10 A current rating. The STPS2045CG-TR offers improved forward voltage characteristics (570 mV @ 10 A) and extended junction temperature range (-55°C ~ 175°C). The STPS20L45CG-TR provides lower forward voltage (550 mV @ 10 A) with a maximum junction temperature of 150°C. Both are ROHS3 compliant and Active.

The MBRS1045CTH from Taiwan Semiconductor Corporation provides 45 V / 10 A specifications with AEC-Q101 automotive qualification and ROHS3 compliance. This part is suitable for applications requiring automotive-grade components.

Higher Current Capacity Substitutes (≥ 15 A):

The DSSK28-0045BS-TRL from IXYS provides 45 V reverse voltage with enhanced 15 A current capacity, offering lower forward voltage (480 mV @ 15 A) and ROHS3 compliance. This part is suitable for designs requiring increased current headroom.

The NRVBB40L45CTT4G from onsemi and STPS41L45CG-TR from STMicroelectronics both provide 45 V / 20 A specifications with ROHS3 compliance and AEC-Q101 automotive qualification (NRVBB40L45CTT4G). These parts offer the highest current capacity and are suitable for applications requiring enhanced thermal performance or increased design margin.

The STPS2545CGY-TR from STMicroelectronics provides 45 V / 12.5 A with AEC-Q101 automotive qualification and ROHS3 compliance, offering a mid-range current option.

Compliance Considerations:

All recommended active substitutes are ROHS3 compliant, addressing the non-compliant status of the obsolete 20CTQ045S. Parts with AEC-Q101 qualification (MBRS1045CTH, NRVBB40L45CTT4G, STPS2545CGY-TR) are suitable for automotive applications requiring formal qualification documentation.

Frequently Asked Questions (FAQ)

Q: Can the VS-20CTQ045STRR-M3 be used as a direct replacement for the 20CTQ045S?

A: Yes. The VS-20CTQ045STRR-M3 is a parametric equivalent with identical electrical specifications (45 V, 10 A, 640 mV forward voltage) and package configuration (TO-263AB). The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the difference between the STPS2045CG-TR and STPS20L45CG-TR?

A: Both parts maintain 45 V / 10 A specifications and TO-263AB packaging. The STPS2045CG-TR offers forward voltage of 570 mV @ 10 A with operating junction temperature range of -55°C ~ 175°C. The STPS20L45CG-TR provides lower forward voltage of 550 mV @ 10 A with maximum junction temperature of 150°C. Selection depends on thermal requirements and forward voltage constraints in the application circuit.

Q: Can I use a 20 A rated part (NRVBB40L45CTT4G or STPS41L45CG-TR) in place of the 10 A 20CTQ045S?

A: Yes. Both parts maintain the 45 V reverse voltage specification and TO-263AB package configuration. The higher current rating (20 A vs. 10 A) provides additional design margin and thermal performance. No circuit modifications are required. These parts are suitable for applications where increased current capacity or thermal headroom is beneficial.

Q: Are all substitute parts RoHS compliant?

A: All recommended active substitutes are ROHS3 compliant. The original 20CTQ045S is RoHS non-compliant. If RoHS compliance is a design requirement, any of the recommended active substitutes satisfy this requirement.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is an automotive qualification standard. Parts bearing this qualification (MBRS1045CTH, NRVBB40L45CTT4G, STPS2545CGY-TR) have undergone formal testing and validation for automotive applications. These parts are suitable for designs requiring automotive-grade component certification.

Q: Do all substitute parts use the same package footprint?

A: All substitute parts use TO-263-3 (D2PAK) packaging with 2 Leads + Tab configuration. Package footprints are compatible across all listed substitutes. PCB layout modifications are not required for package compatibility.

Q: What forward voltage differences should I consider when selecting a substitute?

A: Forward voltage varies across substitutes from 480 mV to 840 mV depending on the part and rated current. Lower forward voltage reduces power dissipation and heat generation. The STPS20L45CG-TR (550 mV @ 10 A) and STPS41L45CG-TR (530 mV @ 20 A) offer the lowest forward voltage options. Circuit design should account for forward voltage variations in power budget calculations.

Q: Which substitute offers the best thermal performance?

A: The NRVBB40L45CTT4G provides the widest operating junction temperature range (-65°C ~ 175°C) and the lowest reverse leakage current (1.2 mA @ 45 V), offering superior thermal stability. The STPS41L45CG-TR also provides low reverse leakage (1.2 mA @ 45 V) with 20 A current capacity.

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