STPS40L40CW Equivalent & Substitute Parts

Part Overview

The STPS40L40CW is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 40 V DC reverse voltage and 20 A average rectified current per diode. The device is packaged in a TO-247-3 through-hole format and operates across a junction temperature range of -55°C to 150°C.

The STPS40L40CW is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode array.

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)
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-247-3
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the STPS40L40CW are identified based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:

Primary Compatibility Criteria:

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

Secondary Compatibility Criteria:

Voltage - DC Reverse (Vr): Equal to or greater than 40 V
Voltage - Forward (Vf): Electrical performance within acceptable operating parameters
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
Operating Temperature Range: Suitable for application requirements

Substitute parts are classified into two categories:

MFR Recommended Substitute: Parts actively recommended by manufacturers as direct replacements, typically offering enhanced specifications or improved compliance status.

Parametric Equivalent: Parts meeting the core electrical and mechanical specifications of the original component, providing functional equivalence within the same package family.

Parameter Comparison

Parameter	STPS40L40CW	STPS4045CWY	40CPQ040
Manufacturer	Vishay General Semiconductor - Diodes Division	STMicroelectronics	SMC Diode Solutions
Product Status	Obsolete	Active	Active
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	45 V	40 V
Current - Average Rectified (Io) (per Diode)	20 A	20 A	20 A
Voltage - Forward (Vf) (Max) @ If	490 mV @ 20 A	760 mV @ 20 A	490 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)
Current - Reverse Leakage @ Vr	800 µA @ 40 V	200 µA @ 45 V	4 mA @ 40 V
Operating Temperature - Junction	-55°C ~ 150°C	-40°C ~ 175°C	-55°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-247-3	TO-247-3	TO-247-3
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

STPS4045CWY (STMicroelectronics)

The STPS4045CWY is classified as an MFR Recommended Substitute. This part maintains the core electrical specifications of the STPS40L40CW while offering enhanced voltage rating (45 V versus 40 V) and extended operating temperature range (-40°C to 175°C versus -55°C to 150°C). The STPS4045CWY holds Active product status and carries AEC-Q101 automotive qualification. The component is ROHS3 compliant, addressing regulatory requirements that the original obsolete part does not meet. Inventory availability is confirmed at 3400 pieces.

40CPQ040 (SMC Diode Solutions)

The 40CPQ040 is classified as a Parametric Equivalent. This part matches the STPS40L40CW across all primary electrical specifications: 40 V reverse voltage, 20 A current rating, 490 mV forward voltage at 20 A, and identical operating temperature range (-55°C to 150°C). The 40CPQ040 maintains Active product status and is ROHS3 compliant. Inventory availability is confirmed at 2270 pieces. The component is suitable for applications requiring exact electrical parameter matching within the original design envelope.

Both substitute parts are compatible with the TO-247-3 through-hole mounting footprint and maintain the 1 Pair Common Cathode configuration. Selection between these substitutes depends on application requirements regarding voltage margin, temperature range, and regulatory compliance status.

Frequently Asked Questions (FAQ)

Q: Can the STPS4045CWY be used as a direct replacement for the STPS40L40CW?

A: The STPS4045CWY is electrically compatible with the STPS40L40CW for applications operating at or below 40 V. The higher 45 V rating provides additional voltage margin. Both components share identical current ratings (20 A), fast recovery speed characteristics, and TO-247-3 packaging. The STPS4045CWY operates across a wider temperature range (-40°C to 175°C) compared to the original part (-55°C to 150°C). Physical footprint compatibility is confirmed.

Q: What is the difference between the STPS4045CWY and 40CPQ040?

A: The STPS4045CWY features a 45 V reverse voltage rating and extended temperature range, while the 40CPQ040 matches the original STPS40L40CW specifications exactly at 40 V and -55°C to 150°C operating range. The STPS4045CWY carries automotive qualification (AEC-Q101), whereas the 40CPQ040 does not. Forward voltage characteristics differ: STPS4045CWY exhibits 760 mV at 20 A, while 40CPQ040 matches the original 490 mV at 20 A. Both are ROHS3 compliant and share identical current ratings and packaging.

Q: Are there any package compatibility concerns when substituting these parts?

A: All three parts utilize the TO-247-3 through-hole package format. The STPS40L40CW uses supplier device package TO-247AC, the STPS4045CWY uses TO-247-3, and the 40CPQ040 uses TO-247AD. These designations represent minor supplier-specific variations of the same physical TO-247-3 package. PCB footprint compatibility is maintained across all three components.

Q: Which substitute part should be selected for new designs?

A: Selection depends on specific application requirements. For applications requiring exact electrical parameter matching with the original design, the 40CPQ040 provides parametric equivalence. For applications benefiting from enhanced voltage margin and extended temperature range, the STPS4045CWY is suitable. The STPS4045CWY is recommended for automotive applications due to AEC-Q101 qualification. Both substitute parts offer improved regulatory compliance (ROHS3) compared to the obsolete original part.

Q: What is the significance of the different forward voltage specifications?

A: The STPS40L40CW and 40CPQ040 both specify 490 mV forward voltage at 20 A, while the STPS4045CWY specifies 760 mV at 20 A. Forward voltage affects power dissipation and thermal performance in the application circuit. Applications sensitive to forward voltage characteristics should select the 40CPQ040 for exact parameter matching or evaluate thermal implications when using the STPS4045CWY.

Q: Are moisture sensitivity considerations different between these parts?

A: All three parts carry MSL 1 (Unlimited) moisture sensitivity classification, indicating no special moisture handling requirements during storage or assembly. Moisture sensitivity is equivalent across the STPS40L40CW, STPS4045CWY, and 40CPQ040.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message