Equivalent & Substitute Parts for 40CTQ045 Schottky Diode Array

Part Overview

The 40CTQ045 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode with 45 V reverse voltage rating and 20 A average rectified current per diode. The device is packaged in TO-220-3 through-hole configuration and is currently classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and repair applications.

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)
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 40CTQ045 is determined by the following critical parameters:

Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io) (per Diode): 20 A minimum
Voltage - Forward (Vf) (Max) @ If: 530 mV @ 20 A or lower
Diode Configuration: 1 Pair Common Cathode
Technology: Schottky or equivalent fast-recovery technology

Mechanical Parameters:

Mounting Type: Through Hole
Package / Case: TO-220-3 or compatible through-hole packages (TO-247-3)

Compliance Parameters:

RoHS Status: ROHS3 Compliant preferred for new designs
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical specifications with package variations) and Manufacturer Recommended Alternatives (active production parts with equivalent or superior electrical performance).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Package / Case	Product Status	RoHS Status	Operating Temp (Junction)
40CTQ045	Vishay General Semiconductor - Diodes Division	45 V	20 A	530 mV @ 20 A	TO-220-3	Obsolete	RoHS non-compliant	-55°C ~ 150°C
VS-40L45CW-N3	Vishay General Semiconductor - Diodes Division	45 V	20 A	530 mV @ 20 A	TO-247-3	Active	ROHS3 Compliant	150°C (Max)
VS-STPS40L45CW-N3	Vishay General Semiconductor - Diodes Division	45 V	20 A	530 mV @ 20 A	TO-247-3	Active	ROHS3 Compliant	-55°C ~ 150°C
SBR4040CT	Diodes Incorporated	40 V	20 A	530 mV @ 20 A	TO-220-3	Active	ROHS3 Compliant	-65°C ~ 150°C
STPS2545CT	STMicroelectronics	45 V	12.5 A	570 mV @ 12.5 A	TO-220-3	Active	ROHS3 Compliant	175°C (Max)
STPS40L45CT	STMicroelectronics	45 V	20 A	530 mV @ 20 A	TO-220-3	Active	ROHS3 Compliant	150°C (Max)
SB4045LCT_T0_00001	Panjit International Inc.	45 V	20 A	530 mV @ 20 A	TO-220-3	Active	ROHS3 Compliant	-55°C ~ 150°C
STPS40L45CW	STMicroelectronics	45 V	20 A	530 mV @ 20 A	TO-247-3	Active	ROHS3 Compliant	150°C (Max)

Engineering Selection Recommendations

Direct Replacement (Same Package - TO-220-3):

The STPS40L45CT (STMicroelectronics) and SB4045LCT_T0_00001 (Panjit International Inc.) are direct replacements for the 40CTQ045 in TO-220-3 package configuration. Both parts maintain identical electrical specifications (45 V, 20 A, 530 mV forward voltage) and are ROHS3 compliant with active product status. The STPS40L45CT offers the highest inventory availability (17,860 pcs) and is recommended for high-volume applications. The SB4045LCT_T0_00001 provides an alternative source with extended temperature range matching the original part (-55°C ~ 150°C).

Package Variant Replacement (TO-247-3):

The VS-STPS40L45CW-N3 (Vishay) and STPS40L45CW (STMicroelectronics) are parametric equivalents with identical electrical performance but in TO-247-3 package. These parts are suitable for applications where the larger TO-247-3 footprint is acceptable or preferred for thermal management. The VS-STPS40L45CW-N3 maintains the full temperature range (-55°C ~ 150°C) of the original part.

Alternative Technology (Super Barrier Diode):

The SBR4040CT (Diodes Incorporated) uses Super Barrier technology with a 40 V reverse voltage rating (5 V lower than the original). This part is suitable only for applications where the 40 V rating is sufficient. It offers extended temperature range (-65°C ~ 150°C) and maintains the same 20 A current rating and TO-220-3 package.

Reduced Current Rating:

The STPS2545CT (STMicroelectronics) is a 12.5 A variant with 45 V rating. This part is suitable only for applications requiring lower current levels and should not be used as a direct replacement for 20 A applications.

All recommended active substitutes are ROHS3 compliant and suitable for new production designs.

Frequently Asked Questions (FAQ)

Q: Can the 40CTQ045 be replaced with the STPS40L45CT?

A: Yes. The STPS40L45CT is a direct replacement with identical electrical specifications (45 V, 20 A, 530 mV forward voltage) and the same TO-220-3 package. Both are Schottky diode arrays with 1 Pair Common Cathode configuration. The STPS40L45CT is ROHS3 compliant and in active production.

Q: What is the difference between TO-220-3 and TO-247-3 packages?

A: Both are through-hole packages for diode arrays with 1 Pair Common Cathode configuration. The TO-247-3 package is physically larger and provides improved thermal dissipation characteristics. Electrical performance is identical between parts with the same specifications. PCB layout and mounting hardware must accommodate the larger TO-247-3 footprint.

Q: Can the SBR4040CT replace the 40CTQ045?

A: The SBR4040CT has a 40 V reverse voltage rating compared to the 40CTQ045's 45 V rating. It is suitable only for applications where 40 V is sufficient. The part uses Super Barrier technology instead of Schottky but maintains the same 20 A current rating and TO-220-3 package. Verify application voltage requirements before substitution.

Q: Why is the 40CTQ045 listed as obsolete?

A: The 40CTQ045 is no longer in active production. Multiple active alternatives with equivalent or superior specifications are available from multiple manufacturers, making the original part unnecessary for new designs.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended active substitutes (STPS40L45CT, SB4045LCT_T0_00001, VS-STPS40L45CW-N3, VS-40L45CW-N3, and STPS40L45CW) are ROHS3 compliant. The original 40CTQ045 is RoHS non-compliant and should be replaced with compliant alternatives for new production.

Q: What is the difference between VS-40L45CW-N3 and VS-STPS40L45CW-N3?

A: Both parts are Vishay Schottky diode arrays with identical electrical specifications (45 V, 20 A, 530 mV forward voltage) in TO-247-3 package. The primary difference is operating temperature range: VS-40L45CW-N3 is rated to 150°C (Max), while VS-STPS40L45CW-N3 is rated -55°C ~ 150°C. Select based on application temperature requirements.

Q: Can the STPS2545CT be used instead of the 40CTQ045?

A: The STPS2545CT has a reduced current rating of 12.5 A compared to the 40CTQ045's 20 A. It is not suitable as a direct replacement for 20 A applications. Use only in applications specifically designed for 12.5 A or lower current levels.

Q: What inventory levels are available for substitute parts?

A: STPS40L45CT (STMicroelectronics) has the highest availability with 17,860 pcs in stock. SBR4040CT (Diodes Incorporated) has 15,697 pcs. VS-STPS40L45CW-N3 has 1,507 pcs. SB4045LCT_T0_00001 has 2,924 pcs. Verify current inventory with suppliers before design finalization.

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