STPS40L45CW Equivalent & Substitute Parts

Part Overview

The STPS40L45CW is a Schottky diode array with 1 pair common cathode configuration, rated for 45 V DC reverse voltage and 20 A average rectified current per diode. The device is packaged in TO-247-3 through-hole format and features fast recovery characteristics with maximum forward voltage of 530 mV at 20 A. The original part is listed as obsolete by Vishay General Semiconductor - Diodes Division. Equivalent and substitute parts are available from active product lines to support continued system design and maintenance requirements.

Key Parameters

Parameter	Value	Unit
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 ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	1.5	mA @ 45 V
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-247-3	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the STPS40L45CW is determined by the following critical parameters: diode configuration (1 pair common cathode), technology (Schottky), reverse voltage rating (45 V), average rectified current (20 A per diode), package type (TO-247-3), and mounting method (through hole). All substitute parts must match these core electrical and mechanical specifications to ensure functional compatibility within the circuit.

Substitute parts are grouped into two categories:

Parametric Equivalents maintain identical electrical performance across all specified parameters, including forward voltage, reverse leakage current, and operating temperature range. These parts are direct replacements with no circuit redesign required.

Manufacturer Recommended Substitutes provide functional alternatives that meet the primary voltage and current requirements but may differ in secondary parameters such as forward voltage, reverse leakage current, or maximum operating temperature. These parts are suitable for applications where the specific parameter variations do not impact system performance.

Parameter Comparison

Parameter	STPS40L45CW (Original)	VS-40L45CW-N3	VS-STPS40L45CW-N3	STPS3045CW	STPS4045CWY	STPS40L45CW (Active)
Manufacturer	Vishay	Vishay	Vishay	STMicroelectronics	STMicroelectronics	STMicroelectronics
Product Status	Obsolete	Active	Active	Active	Active	Active
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	20 A	20 A	20 A	15 A	20 A	20 A
Voltage - Forward (Vf) (Max) @ If	530 mV @ 20 A	530 mV @ 20 A	530 mV @ 20 A	570 mV @ 15 A	760 mV @ 20 A	530 mV @ 20 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	1.5 mA @ 45 V	1.5 mA @ 45 V	1.5 mA @ 45 V	200 µA @ 45 V	200 µA @ 45 V	600 µA @ 45 V
Operating Temperature - Junction	-55 to 150°C	150°C (Max)	-55 to 150°C	200°C (Max)	-40 to 175°C	150°C (Max)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-247-3	TO-247-3	TO-247-3	TO-247-3	TO-247-3	TO-247-3
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	—	Tube	Tube	Tube	Tube	Tube
Inventory Status	2300 Pcs New Original In Stock	1122 Pcs New Original In Stock	1507 Pcs New Original In Stock	1359 Pcs New Original In Stock	3400 Pcs New Original In Stock	2300 Pcs New Original In Stock

Engineering Selection Recommendations

Direct Parametric Equivalents (Preferred for Drop-In Replacement)

VS-STPS40L45CW-N3 and VS-40L45CW-N3 are parametric equivalents manufactured by Vishay General Semiconductor - Diodes Division. Both parts maintain identical electrical specifications to the original STPS40L45CW, including 45 V reverse voltage, 20 A average rectified current, 530 mV forward voltage at 20 A, and 1.5 mA reverse leakage current at 45 V. VS-STPS40L45CW-N3 preserves the full operating temperature range of -55°C to 150°C. Both parts are ROHS3 compliant and available in active production status, making them suitable for new designs and legacy system support.

Manufacturer Recommended Alternatives (Functional Substitutes)

STPS40L45CW (STMicroelectronics active version) provides identical voltage and current ratings with 530 mV forward voltage. This part differs in reverse leakage current (600 µA versus 1.5 mA) and maximum operating temperature (150°C versus -55°C to 150°C). The part is ROHS3 compliant and actively produced.

STPS4045CWY is an automotive-grade alternative rated for 45 V and 20 A with AEC-Q101 qualification. Forward voltage is higher at 760 mV at 20 A, and reverse leakage is lower at 200 µA. Operating temperature range extends to -40°C to 175°C. This part is suitable for applications requiring automotive qualification.

STPS3045CW is a reduced-current alternative rated for 15 A average rectified current (versus 20 A). Reverse voltage remains 45 V. Forward voltage is 570 mV at 15 A, and reverse leakage is 200 µA. Maximum operating temperature is 200°C. This part is suitable only for applications where 15 A current capacity is sufficient.

Compliance Considerations

The original STPS40L45CW is RoHS non-compliant. All active substitute parts are ROHS3 compliant, meeting current environmental regulations for new designs and procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can VS-STPS40L45CW-N3 replace the obsolete STPS40L45CW without circuit modification?

A: Yes. VS-STPS40L45CW-N3 is a parametric equivalent with identical electrical specifications across all critical parameters: 45 V reverse voltage, 20 A average rectified current, 530 mV forward voltage at 20 A, 1.5 mA reverse leakage current, and -55°C to 150°C operating temperature range. The part is pin-compatible in TO-247-3 package and requires no circuit redesign.

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

A: Both parts are parametric equivalents with identical electrical specifications. The primary difference is the maximum operating temperature specification: VS-40L45CW-N3 specifies 150°C maximum, while VS-STPS40L45CW-N3 specifies -55°C to 150°C operating range. For applications requiring the full temperature range, VS-STPS40L45CW-N3 is the appropriate selection.

Q: Can STPS3045CW be used as a substitute?

A: STPS3045CW is a functional alternative only for applications where the 15 A average rectified current rating is sufficient. The original STPS40L45CW is rated for 20 A per diode. Using STPS3045CW in a 20 A application will result in device overstress and failure. Verify circuit current requirements before selecting this part.

Q: Why does STPS4045CWY have higher forward voltage (760 mV) compared to the original (530 mV)?

A: STPS4045CWY is an automotive-grade part with AEC-Q101 qualification. The higher forward voltage is a characteristic of the automotive-qualified device design. This results in increased power dissipation in the diode. Thermal design must account for this difference. Use STPS4045CWY only when automotive qualification is a system requirement.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant. The original STPS40L45CW is RoHS non-compliant. For new designs and procurement requiring environmental compliance, select from the active substitute parts.

Q: What is the reverse leakage current difference between substitute parts?

A: The original STPS40L45CW specifies 1.5 mA reverse leakage at 45 V. VS-STPS40L45CW-N3 and VS-40L45CW-N3 maintain this specification. STPS4045CWY and STPS3045CW specify 200 µA (lower leakage). The active STMicroelectronics STPS40L45CW specifies 600 µA. Lower reverse leakage reduces standby power consumption. Select based on application power budget requirements.

Q: Is the TO-247-3 package identical across all substitute parts?

A: Yes. All parts use TO-247-3 through-hole package with identical pin configuration and mechanical dimensions. Parts are mechanically interchangeable on PCBs designed for TO-247-3 mounting.

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

A: For new designs requiring maximum electrical compatibility with the original specification, select VS-STPS40L45CW-N3. This part provides identical electrical performance, full temperature range, and ROHS3 compliance. For automotive applications, select STPS4045CWY with AEC-Q101 qualification.

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