Equivalent & Substitute Parts for 40L40CW Schottky Diode Array

Part Overview

The Vishay 40L40CW is a Schottky diode array featuring a 1 Pair Common Cathode configuration rated for 40 V DC reverse voltage and 20 A average rectified current per diode. This component is packaged in a TO-247-3 through-hole format and is classified as obsolete. Due to its obsolete product 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)	40 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	1.5 mA @ 40 V
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-247-3
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 40L40CW is determined by the following critical parameters:

Mandatory Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Current - Average Rectified (Io): 20 A per diode
Mounting Type: Through Hole
Package / Case: TO-247-3

Allowable Parameter Variations:

Voltage - DC Reverse (Vr): Substitute parts may exceed 40 V (40 V minimum required)
Voltage - Forward (Vf): Substitute parts may vary within acceptable operating ranges
Current - Reverse Leakage: Substitute parts may vary
Operating Temperature Range: Substitute parts may exceed the original range
Product Status: Active parts are preferred over obsolete parts
RoHS Compliance: Upgraded compliance is acceptable

The substitute parts listed below meet or exceed the electrical and mechanical requirements of the 40L40CW while maintaining functional compatibility in applications designed for the original component.

Parameter Comparison

Parameter	40L40CW (Main)	VS-40L40CW-N3	STPS40L45CW	STPS4045CWY
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	STMicroelectronics	STMicroelectronics
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	20 A	20 A	20 A	20 A
Voltage - Forward (Vf) (Max) @ If	530 mV @ 20 A	530 mV @ 20 A	530 mV @ 20 A	760 mV @ 20 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	1.5 mA @ 40 V	1.5 mA @ 40 V	600 µA @ 45 V	200 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-40°C to 150°C (Max)	-40°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-247-3	TO-247-3	TO-247-3	TO-247-3
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Qualification	-	-	-	AEC-Q101 Automotive

Engineering Selection Recommendations

VS-40L40CW-N3 (Vishay General Semiconductor - Diodes Division)

This part is a parametric equivalent to the 40L40CW with identical electrical specifications. The VS-40L40CW-N3 maintains the same voltage rating (40 V), current rating (20 A), forward voltage (530 mV @ 20 A), and operating temperature range (-55°C ~ 150°C). The primary advantage is its Active product status and ROHS3 compliance, making it suitable for new designs and applications requiring RoHS-compliant components. This substitute is recommended as the primary replacement for direct compatibility.

STPS40L45CW (STMicroelectronics)

This part provides a higher voltage rating (45 V) while maintaining the 20 A current rating and 530 mV forward voltage specification. The STPS40L45CW is suitable for applications where the 40 V rating of the original part is marginal or where additional voltage headroom is beneficial. This part is Active and ROHS3 compliant. The maximum junction temperature is specified as 150°C, matching the original part's upper limit.

STPS4045CWY (STMicroelectronics)

This part offers a 45 V voltage rating and 20 A current rating with AEC-Q101 automotive qualification. The STPS4045CWY features an extended operating temperature range (-40°C ~ 175°C) and improved reverse leakage characteristics (200 µA @ 45 V). The forward voltage is higher at 760 mV @ 20 A, which may impact thermal performance in high-current applications. This part is recommended for automotive applications or where extended temperature operation is required.

Frequently Asked Questions (FAQ)

Q: Can the VS-40L40CW-N3 be used as a direct replacement for the 40L40CW?

A: Yes. The VS-40L40CW-N3 is a parametric equivalent with identical electrical and mechanical specifications. Both parts feature 40 V reverse voltage, 20 A current rating, 530 mV forward voltage at 20 A, and TO-247-3 packaging. The primary difference is product status (Active vs. Obsolete) and RoHS compliance.

Q: What is the difference between the STPS40L45CW and STPS4045CWY?

A: Both parts are STMicroelectronics Schottky diode arrays with 45 V ratings and 20 A current ratings in TO-247-3 packages. The STPS40L45CW maintains the 530 mV forward voltage of the original 40L40CW, while the STPS4045CWY has a higher forward voltage of 760 mV but includes AEC-Q101 automotive qualification and an extended temperature range to 175°C.

Q: Are all substitute parts pin-compatible with the 40L40CW?

A: Yes. All substitute parts use the TO-247-3 package with identical pinout for 1 Pair Common Cathode diode array configuration. Through-hole mounting is consistent across all parts.

Q: Can I use a 45 V rated part in an application designed for 40 V?

A: Yes. The STPS40L45CW and STPS4045CWY are rated for 45 V, which exceeds the 40 V requirement of the original 40L40CW. Higher voltage ratings provide additional safety margin and are functionally compatible with 40 V applications.

Q: What is the impact of higher forward voltage in the STPS4045CWY?

A: The STPS4045CWY has a forward voltage of 760 mV @ 20 A compared to 530 mV in the original part. This 230 mV difference results in increased power dissipation and heat generation at full current. Thermal design considerations may be necessary in applications operating at sustained high currents.

Q: Is RoHS compliance required for my application?

A: The original 40L40CW is RoHS non-compliant. All substitute parts (VS-40L40CW-N3, STPS40L45CW, and STPS4045CWY) are ROHS3 compliant. If your application or market requires RoHS compliance, any of the substitute parts will satisfy this requirement.

Q: Which substitute part should I select for automotive applications?

A: The STPS4045CWY is qualified to AEC-Q101 automotive standards and is the recommended choice for automotive applications. This part includes automotive-grade reliability testing and an extended operating temperature range suitable for automotive environments.

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