STPS40SM80CT Equivalent & Substitute Parts

Part Overview

The STPS40SM80CT is a Schottky diode array manufactured by STMicroelectronics, configured as a 1 Pair Common Cathode arrangement with 80 V reverse voltage rating and 20 A average rectified current per diode. The device is packaged in TO-220-3 through-hole format and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure ongoing component availability for production and repair applications.

Substiute Parts

STPS40SM80CT

STMicroelectronicsIn Stock: 1116STPS40SM80CT Datasheet

Current PartRFQ

MBR2080CT-G

Comchip TechnologyIn Stock: 1070MBR2080CT-G Datasheet

DirectRFQ

DST2080C

Littelfuse Inc.In Stock: 1821DST2080C Datasheet

SimilarRFQ

DST3080C

Littelfuse Inc.In Stock: 703DST3080C Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STPS40SM80CT is determined by the following critical parameters:

Primary Substitution Criteria:

• Diode Configuration: 1 Pair Common Cathode
• Technology: Schottky
• Voltage - DC Reverse (Vr) (Max): 80 V
• Mounting Type: Through Hole
• Package / Case: TO-220-3

Secondary Compatibility Parameters:

• Current - Average Rectified (Io) (per Diode): Equal to or greater than 20 A
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• RoHS Status: ROHS3 Compliant

The substitute parts identified below meet the primary substitution criteria. Variations in forward voltage, reverse leakage current, and operating temperature range are documented to enable informed selection based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent:

MBR2080CT-G (Comchip Technology) is the direct equivalent substitute for STPS40SM80CT. Both parts share identical electrical specifications for voltage rating (80 V), current rating (20 A per diode), and fast recovery speed characteristics. MBR2080CT-G maintains ROHS3 compliance and is currently in active production status, ensuring long-term availability. The forward voltage specification of MBR2080CT-G (950 mV @ 20 A) is higher than the original part (800 mV @ 20 A), and reverse leakage current is doubled (100 µA vs. 50 µA @ 80 V). These differences are within acceptable engineering tolerances for most applications but must be evaluated against specific thermal and efficiency requirements.

Current-Reduced Alternatives:

DST2080C (Littelfuse Inc.) and DST3080C (Littelfuse Inc.) are active-status alternatives with reduced current ratings of 10 A and 15 A respectively. These parts are suitable only for applications where the circuit design operates at or below their respective current ratings. Both Littelfuse devices exhibit higher reverse leakage current (600 µA and 700 µA respectively) compared to the original specification. These alternatives are appropriate for lower-power circuit implementations or as design modifications where current requirements do not exceed their ratings.

All substitute parts maintain TO-220-3 through-hole packaging compatibility and ROHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can MBR2080CT-G be used as a direct replacement for STPS40SM80CT?

A: Yes. MBR2080CT-G meets all primary substitution criteria: identical 80 V reverse voltage rating, 20 A current rating per diode, 1 Pair Common Cathode configuration, Schottky technology, TO-220-3 package, and ROHS3 compliance. The part is in active production status. Forward voltage and reverse leakage specifications differ from the original but remain within acceptable operating parameters for standard applications.

Q: What is the difference between MBR2080CT-G and the DST series alternatives?

A: MBR2080CT-G maintains the 20 A current rating of the original STPS40SM80CT. DST2080C is rated for 10 A and DST3080C for 15 A per diode. Selection between these parts depends on the actual current requirements of the application. All three parts share the same 80 V voltage rating and TO-220-3 package.

Q: Are there any thermal considerations when substituting these parts?

A: The original STPS40SM80CT specifies a maximum junction temperature of 175°C. MBR2080CT-G, DST2080C, and DST3080C all specify operating temperature ranges of -55°C to 150°C, with a maximum junction temperature of 150°C. Applications operating near the upper thermal limits of the original design must account for this 25°C reduction in maximum junction temperature rating.

Q: Do all substitute parts have the same packaging?

A: Yes. STPS40SM80CT, MBR2080CT-G, DST2080C, and DST3080C are all packaged in TO-220-3 through-hole format. Physical dimensions and pin configurations are compatible for direct board-level substitution.

Q: What is the significance of the forward voltage differences?

A: Forward voltage specifications vary across the substitute parts. STPS40SM80CT specifies 800 mV @ 20 A, while MBR2080CT-G specifies 950 mV @ 20 A. This 150 mV difference results in increased power dissipation in the substitute part. Applications with tight thermal budgets or high-frequency switching must account for this increased forward voltage drop.

Q: Are all parts RoHS compliant?

A: Yes. STPS40SM80CT, MBR2080CT-G, DST2080C, and DST3080C are all ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.