Equivalent & Substitute Parts for Tamura 3FS-528

Part Overview

The Tamura 3FS-528 is a 12VA laminated core power transformer with through-hole mounting and dual secondary windings. The primary winding operates at 115V, while the secondary windings provide configurable output: 14V at 840mA in parallel configuration or 28V at 420mA in series configuration. This transformer is classified as Active product status and is RoHS Compliant, making it suitable for applications requiring isolated AC power conversion in industrial and commercial equipment.

Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility within specified tolerances.

Substiute Parts

3FS-528

TamuraIn Stock: 11493FS-528 Datasheet

Current PartRFQ

ST-5-28

Signal TransformerIn Stock: 888ST-5-28 Datasheet

DirectRFQ

F28-420

Triad MagneticsIn Stock: 896F28-420 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Tamura 3FS-528 are classified based on strict electrical and mechanical parameter matching:

Direct Substitutes maintain identical electrical specifications across all critical parameters: 12VA power rating, 115V primary voltage, dual secondary windings with 14V/840mA parallel and 28V/420mA series configurations, laminated core construction, through-hole mounting with PC pin termination, and 2500Vrms isolation voltage.

Similar Substitutes meet all electrical specifications and core functional requirements but may exhibit minor dimensional variations within acceptable mechanical tolerances for through-hole PCB mounting applications.

The substitution logic is based on the following key parameters that determine functional equivalence:

• Identical power rating (12VA)
• Identical primary and secondary voltage configurations
• Identical output current ratings
• Matching core type (laminated)
• Matching winding configuration (single primary, dual secondary)
• Matching mounting and termination style
• Matching isolation voltage rating

Parameter Comparison

Engineering Selection Recommendations

Tamura 3FS-528 is the primary reference part with RoHS Compliant certification and Active product status. Current inventory is 1,044 pieces.

Signal Transformer ST-5-28 is a direct electrical equivalent with ROHS3 Compliant certification and Active product status. Dimensional variations are minor (length -0.70mm, width -1.92mm, height -1.10mm) and remain within acceptable tolerances for through-hole PCB mounting. Inventory is 790 pieces. This part is suitable for direct substitution in applications where the Tamura 3FS-528 is specified.

Triad Magnetics F28-420 is a direct electrical equivalent with ROHS3 Compliant certification and Active product status. Dimensional variations are minimal (length -0.87mm, width -1.85mm, height -1.50mm) and remain within acceptable tolerances for through-hole PCB mounting. Inventory is 794 pieces. This part is suitable for direct substitution in applications where the Tamura 3FS-528 is specified.

All three parts meet identical electrical specifications, isolation voltage requirements, and compliance certifications. Selection between these parts should be based on availability, lead time, and packaging requirements (Tube versus Box).

Frequently Asked Questions (FAQ)

Q: Can the Signal Transformer ST-5-28 be used as a direct replacement for the Tamura 3FS-528?

A: Yes. The ST-5-28 meets all electrical specifications including 12VA power rating, 115V primary voltage, dual secondary windings with 14V/840mA parallel and 28V/420mA series configurations, and 2500Vrms isolation voltage. Dimensional differences are minor and do not affect through-hole PCB mounting compatibility.

Q: Are there any compliance differences between the three parts?

A: The Tamura 3FS-528 carries RoHS Compliant certification. Both the Signal Transformer ST-5-28 and Triad Magnetics F28-420 carry ROHS3 Compliant certification. All three parts are Active product status and suitable for new designs.

Q: What is the difference between packaging types (Tube versus Box)?

A: The Tamura 3FS-528 is supplied in Tube packaging. The Signal Transformer ST-5-28 and Triad Magnetics F28-420 are supplied in Box packaging. Packaging affects handling, storage, and logistics but does not impact electrical or mechanical performance.

Q: Are the dimensional differences significant for PCB layout?

A: No. All dimensional variations between the three parts are less than 2mm in any direction. These differences remain within standard through-hole PCB mounting tolerances and do not require PCB redesign.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. All three parts share identical electrical specifications, mounting type (through-hole), termination style (PC pin), and isolation voltage rating. They are functionally interchangeable without circuit modification.

Q: What is the isolation voltage rating and why is it important?

A: All three parts provide 2500Vrms isolation voltage between primary and secondary windings. This rating ensures safe electrical isolation in applications requiring galvanic separation between input and output circuits.