STPS40SM120CT Equivalent & Substitute Parts

Part Overview

The STPS40SM120CT is a Schottky diode array manufactured by STMicroelectronics, configured as a 1 Pair Common Cathode arrangement with a 120 V reverse voltage rating and 20 A average rectified current per diode. The component is housed in a TO-220-3 through-hole package and is classified as obsolete. Due to its obsolete product status, equivalent substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

STPS40SM120CT

STMicroelectronicsIn Stock: 2581STPS40SM120CT Datasheet

Current PartRFQ

STPS40M120CT

STMicroelectronicsIn Stock: 3206STPS40M120CT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STPS40SM120CT is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

• Voltage - DC Reverse (Vr) (Max): 120 V
• Current - Average Rectified (Io) (per Diode): 20 A
• Diode Configuration: 1 Pair Common Cathode
• Technology: Schottky

Mechanical Parameters (Must Match):

• Package / Case: TO-220-3
• Mounting Type: Through Hole

Compliance Parameters (Must Match):

• RoHS Status: ROHS3 Compliant

The substitute part STPS40M120CT meets all critical electrical, mechanical, and compliance requirements. Variations in forward voltage (Vf) and reverse leakage current (Ir) within the specified operating ranges do not preclude substitution, as these parameters remain within acceptable tolerances for the application class.

Parameter Comparison

Engineering Selection Recommendations

The STPS40M120CT serves as a direct electrical and mechanical substitute for the STPS40SM120CT. Both components are manufactured by STMicroelectronics and share identical voltage ratings, current ratings, package configuration, and mounting specifications. Both parts maintain ROHS3 compliance and are classified as obsolete.

The STPS40M120CT exhibits a lower forward voltage drop (790 mV versus 830 mV at 20 A), which represents an improvement in thermal efficiency. The higher reverse leakage current (370 µA versus 275 µA at 120 V) remains within acceptable operating parameters for Schottky diode applications in this voltage and current class.

Selection between these parts should be based on component availability and inventory status. Both parts are suitable for direct replacement in existing designs without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the STPS40M120CT be used as a direct replacement for the STPS40SM120CT?

A: Yes. The STPS40M120CT is electrically and mechanically equivalent to the STPS40SM120CT. Both components share identical voltage ratings (120 V), current ratings (20 A per diode), diode configuration (1 Pair Common Cathode), and package type (TO-220-3). No circuit redesign is required.

Q: What is the significance of the forward voltage difference between these parts?

A: The STPS40M120CT has a forward voltage of 790 mV at 20 A, compared to 830 mV for the STPS40SM120CT. This 40 mV difference results in lower power dissipation and improved thermal performance in the substitute part. This variation is within normal manufacturing tolerances for Schottky diodes and does not affect circuit functionality.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the STPS40SM120CT and STPS40M120CT are ROHS3 compliant and REACH unaffected. Both parts carry identical compliance certifications and are suitable for applications requiring regulatory compliance.

Q: What does the TO-220-3 package designation indicate?

A: TO-220-3 specifies a through-hole package with three leads, commonly used for power semiconductor devices. This package provides direct mechanical and electrical compatibility between the main part and substitute, ensuring identical PCB footprint and thermal management characteristics.

Q: Why is the STPS40SM120CT classified as obsolete?

A: Obsolete status indicates that the manufacturer has discontinued production of this component. The STPS40M120CT, also obsolete, represents the available equivalent from the same manufacturer. For long-term component sourcing, alternative suppliers or newer product lines should be evaluated.

Q: Does the reverse leakage current difference affect circuit performance?

A: The reverse leakage current of the STPS40M120CT (370 µA at 120 V) is higher than the STPS40SM120CT (275 µA at 120 V). This difference is within normal Schottky diode specifications and does not impact circuit functionality in standard rectification and switching applications. Applications with stringent leakage requirements should evaluate this parameter against specific design constraints.