STPS30SM120ST Equivalent & Substitute Parts

Part Overview

The STPS30SM120ST is a Schottky rectifier diode manufactured by STMicroelectronics, rated for 120 V DC reverse voltage and 30 A average rectified current in a Through Hole TO-220-3 package. This component is classified as Obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. The part is ROHS3 compliant and carries ECOPACK®2 series designation.

Substiute Parts

STPS30SM120ST

STMicroelectronicsIn Stock: 3952STPS30SM120ST Datasheet

Current PartRFQ

STPS30L120CT

STMicroelectronicsIn Stock: 2486STPS30L120CT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STPS30SM120ST is determined by the following critical electrical and mechanical parameters:

Voltage Rating: The substitute part must maintain the 120 V DC reverse voltage specification to ensure circuit protection and component reliability.

Package Configuration: The TO-220-3 Through Hole package is a mandatory requirement for mechanical and thermal compatibility with existing PCB layouts and thermal management systems.

Technology Type: Schottky diode technology must be preserved to maintain the fast recovery characteristics and forward voltage performance inherent to the original design.

Speed Characteristics: Fast Recovery ≤ 500ns, > 200mA (Io) specification must be maintained for switching performance consistency.

Compliance Standards: ROHS3 compliance and MSL 1 rating are required for regulatory and environmental compatibility.

The STPS30L120CT is identified as a manufacturer-recommended substitute based on these parameters. While the current rating differs (15 A per diode in a common cathode configuration versus 30 A single diode), the voltage rating, package type, technology, speed characteristics, and compliance standards align with the substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

The STPS30L120CT is the manufacturer-recommended substitute for the obsolete STPS30SM120ST. Both components share identical voltage ratings (120 V), package configuration (TO-220-3), technology classification (Schottky), and speed characteristics (Fast Recovery ≤ 500ns, > 200mA). Both maintain ROHS3 compliance and MSL 1 rating.

The primary distinction is the diode configuration and current rating. The STPS30L120CT is a 1 Pair Common Cathode diode array with 15 A per diode rating, compared to the single 30 A diode in the STPS30SM120ST. The substitute part is currently in Active product status, ensuring ongoing availability and supply chain continuity.

Selection of the STPS30L120CT is supported by STMicroelectronics manufacturer designation and regulatory compliance alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can the STPS30L120CT directly replace the STPS30SM120ST in all applications?

A: The STPS30L120CT shares the same voltage rating (120 V), package type (TO-220-3), technology (Schottky), and speed characteristics as the STPS30SM120ST. However, the STPS30L120CT is a diode array with 1 Pair Common Cathode configuration and 15 A per diode rating, whereas the STPS30SM120ST is a single 30 A diode. Circuit topology and current requirements determine compatibility.

Q: What is the significance of the Common Cathode configuration in the STPS30L120CT?

A: The 1 Pair Common Cathode configuration means two diodes share a common cathode terminal within the TO-220-3 package. This configuration affects circuit connectivity and must be evaluated against the original single-diode topology of the STPS30SM120ST.

Q: Are both parts compliant with current regulatory standards?

A: Both the STPS30SM120ST and STPS30L120CT are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. Both are REACH Unaffected and classified under ECCN EAR99.

Q: Why is the STPS30SM120ST classified as Obsolete?

A: The STPS30SM120ST carries Obsolete product status. The STPS30L120CT is the manufacturer-recommended substitute and maintains Active product status, ensuring continued availability and support.

Q: What are the forward voltage differences between these parts?

A: The STPS30SM120ST specifies 950 mV maximum forward voltage at 30 A, while the STPS30L120CT specifies 880 mV maximum forward voltage at 15 A. Forward voltage characteristics are measured at their respective rated currents.

Q: How do reverse leakage currents compare?

A: The STPS30SM120ST specifies 275 µA reverse leakage at 120 V, while the STPS30L120CT specifies 200 µA reverse leakage at 120 V. Both measurements are taken at the maximum reverse voltage rating.

Q: Is the TO-220-3 package identical for both parts?

A: Both parts use the TO-220-3 Through Hole package configuration. Physical dimensions and thermal characteristics are consistent with this package standard. Internal diode configuration differs due to the array versus single-diode topology.