STPS640CT Equivalent & Substitute Parts

Part Overview

The STPS640CT is a Schottky diode array manufactured by STMicroelectronics, configured as a 1 Pair Common Cathode unit rated for 40 V DC reverse voltage and 3 A average rectified current per diode. The device is packaged in a Through Hole TO-220-3 configuration and features fast recovery characteristics suitable for rectification applications.

The STPS640CT 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 component.

Substiute Parts

STPS640CT

STMicroelectronicsIn Stock: 2152STPS640CT Datasheet

Current PartRFQ

SBL4040PT-E3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 1389SBL4040PT-E3/45 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STPS640CT is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Diode Configuration: 1 Pair Common Cathode
• Technology: Schottky
• Voltage - DC Reverse (Vr) (Max): 40 V
• Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
• Mounting Type: Through Hole
• RoHS Status: ROHS3 Compliant

Current Rating Consideration: The STPS640CT is rated for 3 A average rectified current per diode. Substitute parts may exceed this current rating, as higher current capacity provides functional compatibility within the same voltage and configuration class. The substitute part SBL4040PT-E3/45 is rated for 40 A per diode, which exceeds the original specification and remains functionally compatible.

Package Variation: While the STPS640CT uses TO-220-3 packaging, the substitute SBL4040PT-E3/45 uses TO-3P-3 (SC-65-3) packaging. Both are Through Hole mounting types and represent different thermal and mechanical form factors suitable for different application requirements.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The STPS640CT is classified as Obsolete, while the substitute part SBL4040PT-E3/45 is classified as Active. Selection of the Active substitute part ensures long-term supply chain availability and ongoing manufacturer support.

Compliance and Certification: Both the STPS640CT and SBL4040PT-E3/45 are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements. Both parts carry the same ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Current Rating and Thermal Performance: The SBL4040PT-E3/45 provides significantly higher current capacity (40 A versus 3 A per diode). This higher rating does not preclude substitution in applications designed for the STPS640CT, as the substitute operates within the same voltage class and configuration. The TO-3P-3 package of the SBL4040PT-E3/45 provides enhanced thermal dissipation compared to the TO-220-3 package of the STPS640CT.

Operating Temperature Range: The STPS640CT specifies a maximum junction temperature of 150°C. The SBL4040PT-E3/45 specifies an operating range of -40°C to 125°C. Applications requiring operation above 125°C junction temperature require evaluation of thermal management and derating.

Reverse Leakage Characteristics: The STPS640CT exhibits 100 µA reverse leakage at 40 V, while the SBL4040PT-E3/45 exhibits 10 mA reverse leakage at 40 V. Applications sensitive to reverse leakage current require assessment of this parameter difference.

Frequently Asked Questions (FAQ)

Q: Can the SBL4040PT-E3/45 directly replace the STPS640CT in existing designs?

A: The SBL4040PT-E3/45 is functionally compatible as a substitute based on matching Diode Configuration (1 Pair Common Cathode), Technology (Schottky), Voltage Rating (40 V), and Speed (Fast Recovery ≤ 500 ns). However, the different package form factor (TO-3P-3 versus TO-220-3) requires mechanical and thermal evaluation for the specific application. PCB layout modifications may be necessary to accommodate the different package dimensions.

Q: What are the key differences between these two parts?

A: The primary differences are: (1) Current Rating: SBL4040PT-E3/45 is rated for 40 A per diode versus 3 A for STPS640CT; (2) Package: SBL4040PT-E3/45 uses TO-3P-3 (SC-65-3) versus TO-220-3 for STPS640CT; (3) Product Status: SBL4040PT-E3/45 is Active versus Obsolete for STPS640CT; (4) Reverse Leakage: SBL4040PT-E3/45 exhibits 10 mA versus 100 µA for STPS640CT at 40 V; (5) Operating Temperature Range: SBL4040PT-E3/45 specifies -40°C to 125°C versus 150°C maximum for STPS640CT.

Q: Is the higher current rating of the SBL4040PT-E3/45 a concern for applications designed for 3 A operation?

A: No. A substitute part with higher current capacity operates within the design envelope of the original part. The 40 A rating of the SBL4040PT-E3/45 does not impose additional stress on circuits designed for 3 A operation. The device will operate at the same current levels as the original STPS640CT.

Q: What is the significance of the different reverse leakage specifications?

A: The SBL4040PT-E3/45 exhibits 10 mA reverse leakage at 40 V, compared to 100 µA for the STPS640CT. This 100-fold difference may be significant in applications where reverse leakage current directly affects circuit performance, such as precision analog circuits or high-impedance applications. Standard rectification applications are typically unaffected by this difference.

Q: Are there thermal management differences between the TO-220-3 and TO-3P-3 packages?

A: Yes. The TO-3P-3 package (used by SBL4040PT-E3/45) provides larger surface area and improved thermal dissipation compared to the TO-220-3 package (used by STPS640CT). This enhanced thermal performance supports the higher current rating of the substitute part. Applications requiring specific thermal characteristics must evaluate package-level thermal resistance specifications.

Q: Do both parts meet current environmental and regulatory requirements?

A: Yes. Both the STPS640CT and SBL4040PT-E3/45 are ROHS3 Compliant and REACH Unaffected, meeting current environmental regulations. Both parts carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications.