STTH30W03CW Equivalent & Substitute Parts

Part Overview

The STTH30W03CW is a diode array rectifier manufactured by STMicroelectronics, configured as a 1 Pair Common Cathode design rated for 300 V DC reverse voltage and 15 A average rectified current per diode. The device is packaged in TO-247-3 through-hole configuration and utilizes standard fast recovery diode technology with a 20 ns reverse recovery time. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing system support and new design implementations.

Substiute Parts

STTH30W03CW

STMicroelectronicsIn Stock: 8282STTH30W03CW Datasheet

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LQA30A300C

Power IntegrationsIn Stock: 1329LQA30A300C Datasheet

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SDUR3030WT

SMC Diode SolutionsIn Stock: 748SDUR3030WT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STTH30W03CW is determined by strict equivalence across the following parameters: voltage rating (300 V DC reverse), current rating (15 A average rectified per diode), diode configuration (1 Pair Common Cathode), package type (TO-247-3), and mounting method (through-hole). All identified substitute parts meet these core electrical and mechanical requirements. Substitute parts are grouped based on technology type: standard fast recovery diodes and Schottky diodes. Technology differences result in variations in forward voltage drop, reverse recovery time, and reverse leakage current, which are documented in the parameter comparison table for engineering evaluation.

Parameter Comparison

Engineering Selection Recommendations

SDUR3030WT (SMC Diode Solutions) is a direct technology equivalent to the STTH30W03CW, both utilizing standard fast recovery diode technology. This part is currently active in production and maintains ROHS3 compliance. The SDUR3030WT exhibits lower forward voltage drop (1.25 V @ 10 A versus 1.4 V @ 15 A) and lower reverse leakage current (5 µA versus 10 µA), resulting in reduced power dissipation and improved efficiency. The maximum junction temperature rating is 150°C compared to 175°C for the original part. REACH status is affected for this part.

LQA30A300C (Power Integrations) is a Schottky diode array substitute that meets all core electrical and mechanical requirements. This part is currently active in production and maintains RoHS compliance. The Schottky technology provides significantly faster reverse recovery time (13 ns versus 20 ns), beneficial for high-frequency switching applications. However, the forward voltage drop is higher (1.9 V @ 15 A), resulting in increased power dissipation compared to standard diodes. The maximum junction temperature rating is 150°C. Reverse leakage current is elevated at 25 µA @ 300 V.

Selection between SDUR3030WT and LQA30A300C depends on application requirements: SDUR3030WT for applications prioritizing low forward voltage drop and efficiency; LQA30A300C for applications requiring faster switching characteristics and lower reverse recovery time.

Frequently Asked Questions (FAQ)

Q: Can SDUR3030WT and LQA30A300C be used interchangeably with STTH30W03CW?

A: Both parts meet the core electrical specifications (300 V, 15 A, 1 Pair Common Cathode configuration) and mechanical requirements (TO-247-3 package, through-hole mounting). However, differences in forward voltage drop, reverse recovery time, and reverse leakage current must be evaluated against specific application requirements. Direct substitution is possible from a mechanical and voltage/current standpoint, but thermal and efficiency characteristics differ.

Q: What is the impact of the lower maximum junction temperature on SDUR3030WT and LQA30A300C?

A: Both substitute parts have a maximum junction temperature of 150°C compared to 175°C for the STTH30W03CW. Applications operating near the original part's thermal limits may require thermal management review when substituting with these parts.

Q: How do the forward voltage drop differences affect circuit performance?

A: The SDUR3030WT exhibits lower forward voltage drop (1.25 V @ 10 A) compared to the original STTH30W03CW (1.4 V @ 15 A), resulting in lower power dissipation and improved efficiency. The LQA30A300C Schottky device has higher forward voltage drop (1.9 V @ 15 A), increasing power dissipation. Forward voltage drop directly impacts heat generation and power supply efficiency in rectification circuits.

Q: What is the significance of reverse recovery time differences?

A: The STTH30W03CW has a 20 ns reverse recovery time, SDUR3030WT has 45 ns, and LQA30A300C has 13 ns. Faster reverse recovery time (LQA30A300C) reduces switching losses in high-frequency applications. Slower reverse recovery time (SDUR3030WT) may increase switching losses but is acceptable in lower-frequency applications.

Q: Are there compliance differences between the substitute parts?

A: STTH30W03CW and SDUR3030WT are both ROHS3 compliant. LQA30A300C is RoHS compliant. SDUR3030WT has affected REACH status, while STTH30W03CW and LQA30A300C are REACH unaffected. Regulatory compliance requirements for the target application must be verified.

Q: What is the difference between standard and Schottky diode technology in these parts?

A: STTH30W03CW and SDUR3030WT use standard fast recovery diode technology, characterized by moderate forward voltage drop and reverse recovery time. LQA30A300C uses Schottky technology, which provides lower reverse recovery time and higher forward voltage drop. Schottky diodes are preferred for high-frequency switching applications where reverse recovery losses are critical.