40CPQ040 Equivalent & Substitute Parts

Part Overview

The 40CPQ040 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode arrangement with a 40 V DC reverse voltage rating and 20 A average rectified current per diode. The device is packaged in a TO-247-3 through-hole configuration and features fast recovery characteristics suitable for high-frequency rectification applications.

The 40CPQ040 has reached obsolete product status. Equivalent and substitute parts are available from active product lines that maintain electrical and mechanical compatibility with the original specification.

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	490 mV @ 20 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	4 mA @ 40 V
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-247-3

Substitute Part Grouping Explanation

Substitution of the 40CPQ040 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Diode configuration must be 1 Pair Common Cathode
Technology must be Schottky
DC reverse voltage rating must be equal to or greater than 40 V
Average rectified current per diode must be equal to or greater than 20 A
Fast recovery speed characteristic (≤ 500 ns, > 200 mA)
Mounting type must be Through Hole
Package type must be TO-247-3

Mechanical Compatibility Requirements:

Package / Case designation: TO-247-3
Pin configuration and lead spacing must be compatible with TO-247-3 standard

Substitute parts are classified into two categories:

Manufacturer Recommended Substitutes: Parts that exceed the original electrical specifications while maintaining full mechanical and functional compatibility. These parts are from active product lines and offer enhanced performance characteristics.

Parametric Equivalents: Parts that match the original electrical specifications precisely while offering improved product status or compliance certifications.

Parameter Comparison

Parameter	40CPQ040 (Vishay)	STPS4045CW (STMicroelectronics)	STPS4045CWY (STMicroelectronics)	40CPQ040 (SMC Diode Solutions)
Manufacturer	Vishay General Semiconductor	STMicroelectronics	STMicroelectronics	SMC Diode Solutions
Product Status	Obsolete	Active	Active	Active
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	45 V	45 V	40 V
Current - Average Rectified (Io) (per Diode)	20 A	20 A	20 A	20 A
Voltage - Forward (Vf) (Max) @ If	490 mV @ 20 A	760 mV @ 20 A	760 mV @ 20 A	490 mV @ 20 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA
Current - Reverse Leakage @ Vr	4 mA @ 40 V	200 µA @ 45 V	200 µA @ 45 V	4 mA @ 40 V
Operating Temperature - Junction	-55°C ~ 150°C	175°C (Max)	-40°C ~ 175°C	-55°C ~ 150°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
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	Not specified	Not specified	AEC-Q101 Qualified	Not specified

Engineering Selection Recommendations

For Direct Parametric Replacement:

The 40CPQ040 from SMC Diode Solutions provides an exact electrical and mechanical match to the original Vishay part. This substitute maintains identical voltage ratings (40 V), current ratings (20 A), forward voltage characteristics (490 mV @ 20 A), and operating temperature range (-55°C ~ 150°C). The SMC part is currently in active production status and carries ROHS3 compliance certification, addressing regulatory requirements that the original obsolete part does not meet.

For Enhanced Performance Applications:

The STPS4045CW and STPS4045CWY from STMicroelectronics are manufacturer-recommended substitutes that provide increased voltage headroom with a 45 V DC reverse rating while maintaining the 20 A current specification and TO-247-3 package compatibility. These parts are suitable for applications where the additional 5 V margin provides design flexibility.

The STPS4045CWY variant includes AEC-Q101 automotive qualification and an extended operating temperature range (-40°C ~ 175°C), making it appropriate for automotive and high-reliability applications. Both STMicroelectronics parts are in active production with ROHS3 compliance.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant, addressing environmental and regulatory requirements. The original 40CPQ040 from Vishay is marked as RoHS non-compliant. Selection of a compliant substitute is necessary for new designs and applications subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can the STPS4045CW or STPS4045CWY be used as a direct replacement for the 40CPQ040?

A: Yes. Both parts maintain the 1 Pair Common Cathode configuration, Schottky technology, 20 A current rating, fast recovery speed, and TO-247-3 package. The 45 V rating exceeds the 40 V requirement, providing compatibility with circuits designed for the original 40 V part. The higher forward voltage (760 mV vs. 490 mV) must be evaluated in applications where forward voltage drop is a critical design parameter.

Q: What is the difference between STPS4045CW and STPS4045CWY?

A: Both parts share identical electrical specifications and packaging. The STPS4045CWY includes AEC-Q101 automotive qualification and specifies an operating temperature range of -40°C ~ 175°C. The STPS4045CW specifies a maximum junction temperature of 175°C without the automotive qualification. Selection depends on application requirements and automotive compliance needs.

Q: Is the SMC Diode Solutions 40CPQ040 identical to the Vishay 40CPQ040?

A: The SMC part matches the Vishay part in all electrical parameters: 40 V rating, 20 A current, 490 mV forward voltage, and -55°C ~ 150°C operating range. Both use the TO-247-3 package. The SMC part is in active production with ROHS3 compliance, whereas the Vishay part is obsolete and RoHS non-compliant.

Q: Are there any package differences between these substitutes?

A: All listed substitutes use the TO-247-3 package designation. The Vishay part specifies TO-247AC as the supplier device package, while the SMC part specifies TO-247AD, and the STMicroelectronics parts specify TO-247-3. These designations refer to manufacturer-specific package variants within the TO-247-3 standard. Pin configuration and lead spacing are compatible across all variants.

Q: What happens if I use a 45 V rated part in a 40 V circuit?

A: The higher voltage rating does not create a compatibility issue. The 45 V rating indicates the maximum reverse voltage the device can withstand. A 40 V circuit operates within this limit. The device functions identically to a 40 V rated part in this application.

Q: Should I consider the forward voltage difference when selecting a substitute?

A: The forward voltage difference between the original part (490 mV @ 20 A) and the STMicroelectronics substitutes (760 mV @ 20 A) affects power dissipation and thermal performance. In applications where forward voltage drop is a critical design parameter, this 270 mV difference must be evaluated. The SMC Diode Solutions 40CPQ040 maintains the original 490 mV specification and is recommended for applications sensitive to forward voltage characteristics.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts are supplied in Tube packaging and are through-hole mounted devices in the TO-247-3 case. The original Vishay part does not specify a packaging format in the provided data. All substitutes are compatible with standard through-hole PCB assembly processes.

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