SS33 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS33 is an active Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 30 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AB (SMC) package. This component is designed for fast recovery applications with switching speeds ≤ 500 ns at currents > 200 mA. The SS33 is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1) and is currently in active production with 26,200 units in stock.

Equivalent and substitute parts are identified when alternative manufacturers offer Schottky diodes with matching or superior electrical specifications within the same package family, enabling design flexibility, supply chain redundancy, and procurement optimization.

Substiute Parts

SS33

Taiwan Semiconductor CorporationIn Stock: 26247SS33 Datasheet

Current PartRFQ

SK33

SMC Diode SolutionsIn Stock: 7565SK33 Datasheet

DirectRFQ

STPS340S

STMicroelectronicsIn Stock: 50815STPS340S Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SS33 are classified into two categories based on electrical parameter alignment:

Direct Equivalent (SK33): Matches all critical electrical specifications including 30 V reverse voltage rating, 3 A rectified current, fast recovery speed ≤ 500 ns, and identical package configuration (DO-214AB SMC). The SK33 is manufactured by SMC Diode Solutions and operates across an extended junction temperature range (-65°C to 125°C). This part qualifies as a direct functional replacement with no circuit redesign required.

Similar Specification (STPS340S): Provides superior voltage rating (40 V vs. 30 V) and lower reverse leakage current (20 µA @ 40 V vs. 500 µA @ 30 V) while maintaining 3 A rectified current capacity and identical package form factor. The STPS340S is manufactured by STMicroelectronics and operates to a maximum junction temperature of 150°C. This part is suitable for applications where higher voltage margin or reduced leakage is beneficial, though it is not required for circuits designed to the SS33 specification.

Substitution eligibility is determined by the following parameters: Schottky technology, minimum 30 V reverse voltage rating, 3 A rectified current capacity, fast recovery speed ≤ 500 ns, surface mount configuration, and DO-214AB SMC package compatibility.

Parameter Comparison

Engineering Selection Recommendations

SS33 (Primary Selection): Select the SS33 when Taiwan Semiconductor Corporation is the preferred supplier or when existing supply agreements specify this manufacturer. The part is ROHS3 compliant, REACH unaffected, and maintains active production status with substantial inventory availability.

SK33 (Direct Equivalent): Select the SK33 as a direct functional replacement when supply constraints affect SS33 availability or when SMC Diode Solutions is an approved alternate supplier. The SK33 provides identical electrical performance with extended lower temperature operating range (-65°C vs. -55°C minimum). ROHS3 compliance is confirmed; however, REACH status is listed as affected. Verify REACH compliance requirements for your application before selection.

STPS340S (Enhanced Specification): Select the STPS340S when circuit design permits operation at higher reverse voltage ratings or when reduced reverse leakage current provides system-level benefits. The STPS340S offers 40 V reverse voltage margin (33% higher than SS33 specification) and significantly lower leakage (20 µA vs. 500 µA), with maximum junction temperature of 150°C. ROHS3 compliance and REACH unaffected status are confirmed. This part is suitable for applications requiring enhanced reliability margins or thermal performance.

All three parts maintain identical surface mount package configuration (DO-214AB SMC), enabling direct PCB footprint compatibility without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the SK33 be used as a direct replacement for the SS33 without circuit modification?

A: Yes. The SK33 provides identical electrical specifications for voltage rating (30 V), rectified current (3 A), recovery speed (≤ 500 ns), and reverse leakage current (500 µA @ 30 V). Both parts use the DO-214AB SMC package with identical pinout and footprint. No circuit redesign is required.

Q: What is the primary difference between the SS33 and STPS340S?

A: The STPS340S provides a higher reverse voltage rating (40 V vs. 30 V) and significantly lower reverse leakage current (20 µA @ 40 V vs. 500 µA @ 30 V). Both maintain 3 A rectified current and fast recovery characteristics. The STPS340S is suitable for applications where higher voltage margin or reduced leakage improves system performance.

Q: Are all three parts compatible with the same PCB footprint?

A: Yes. The SS33, SK33, and STPS340S all use the DO-214AB SMC surface mount package with identical pinout and land pattern. Direct PCB substitution is possible without layout modification.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging?

A: Tape & Reel (TR) is a continuous reel format suitable for high-volume automated assembly. Cut Tape (CT) & Digi-Reel® provides flexibility for lower-volume or mixed-component orders. Both formats contain the same component; packaging selection depends on production volume and assembly equipment compatibility.

Q: Are all three parts RoHS3 compliant?

A: Yes. The SS33, SK33, and STPS340S are all ROHS3 compliant. The SK33 carries REACH affected status, while the SS33 and STPS340S are REACH unaffected. Verify REACH compliance requirements for your specific application and region.

Q: What is the moisture sensitivity level (MSL) for these parts?

A: All three parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without special desiccant or humidity control requirements.

Q: Can the STPS340S be used in a circuit designed for 30 V operation?

A: Yes. The STPS340S is rated for 40 V reverse voltage, which exceeds the 30 V requirement. It operates safely in circuits designed for 30 V operation and provides additional voltage margin. The higher forward voltage drop (630 mV vs. 550 mV at 3 A) should be evaluated for power dissipation impact in the specific application.