Equivalent & Substitute Parts for Tamura 3FS-428

Part Overview

The Tamura 3FS-428 is a laminated core power transformer rated at 6VA with a single primary winding (115V) and dual secondary windings (14V parallel / 28V series configuration). This through-hole mounted transformer is designed for Class 2/3 applications requiring galvanic isolation at 2500Vrms. The part is Active in product status and RoHS Compliant, making it suitable for modern electronic equipment requiring environmental compliance. Equivalent substitute parts are necessary to address supply chain continuity, inventory availability, or packaging preferences while maintaining identical electrical and mechanical performance specifications.

Substiute Parts

3FS-428

TamuraIn Stock: 12393FS-428 Datasheet

Current PartRFQ

ST-4-28

Signal TransformerIn Stock: 1359ST-4-28 Datasheet

DirectRFQ

F28-200

Triad MagneticsIn Stock: 1149F28-200 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Tamura 3FS-428 are classified based on strict electrical and mechanical parameter matching. The substitution logic is determined by the following criteria:

Primary Substitution Criteria:

• Identical power rating (6VA)
• Identical primary voltage (115V)
• Identical secondary voltage configuration (Parallel 14V / Series 28V)
• Identical secondary current ratings (Parallel 400mA / Series 200mA)
• Identical core type (Laminated)
• Identical winding configuration (Single primary, Dual secondary, No center tap)
• Identical mounting type (Through Hole)
• Identical termination style (PC Pin)
• Identical isolation voltage (2500Vrms)

Secondary Considerations:

• Product status (Active)
• RoHS compliance status
• Physical dimensions (within tolerance for PCB mounting)
• Packaging format (Tube vs. Box does not affect electrical compatibility)

Parts meeting all primary criteria are classified as Direct Equivalents. Parts meeting all primary criteria with minor dimensional variations are classified as Similar Equivalents.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent Selection:

The Signal Transformer ST-4-28 and Triad Magnetics F28-200 are direct electrical equivalents to the Tamura 3FS-428. All three parts share identical electrical specifications across power rating, voltage configuration, current ratings, core type, winding configuration, mounting type, termination style, and isolation voltage.

Compliance Considerations:

All three parts maintain Active product status and comply with RoHS requirements. The Tamura 3FS-428 carries RoHS Compliant certification, while both substitute parts carry ROHS3 Compliant certification, indicating compliance with the most current RoHS directive. The Triad Magnetics F28-200 additionally carries REACH Unaffected status.

Physical Compatibility:

Dimensional variations exist between the three parts. The Tamura 3FS-428 measures 41.50mm L × 34.83mm W × 34.55mm H (seated). The Signal Transformer ST-4-28 measures 41.30mm L × 33.30mm W × 33.30mm H (seated). The Triad Magnetics F28-200 measures 41.28mm L × 33.32mm W × 33.32mm H (seated). These dimensional differences are within typical PCB mounting tolerances for through-hole components. Verification of available PCB footprint space is required prior to substitution.

Packaging Format:

The Tamura 3FS-428 is supplied in Tube packaging, while both substitute parts are supplied in Box packaging. Packaging format does not affect electrical performance or component functionality.

Frequently Asked Questions (FAQ)

Q: Can the Signal Transformer ST-4-28 be used as a direct replacement for the Tamura 3FS-428?

A: Yes. The ST-4-28 meets all electrical specifications of the 3FS-428, including 6VA power rating, 115V primary voltage, 14V/28V secondary configuration, 400mA/200mA current ratings, 2500Vrms isolation, and identical winding configuration. Physical dimensions are within standard PCB mounting tolerances.

Q: Can the Triad Magnetics F28-200 be used as a direct replacement for the Tamura 3FS-428?

A: Yes. The F28-200 meets all electrical specifications of the 3FS-428. Physical dimensions are within standard PCB mounting tolerances. The F28-200 carries additional REACH Unaffected certification.

Q: What are the key electrical parameters that determine substitutability?

A: The critical parameters are: 6VA power rating, 115V primary voltage, dual secondary windings with 14V parallel and 28V series configuration, 400mA parallel and 200mA series current ratings, laminated core type, through-hole mounting, PC pin termination, and 2500Vrms isolation voltage. Any deviation in these parameters disqualifies a part as an equivalent.

Q: Do packaging differences (Tube vs. Box) affect compatibility?

A: No. Packaging format is a logistics consideration only and does not affect electrical performance, mechanical fit, or functional compatibility. The component itself is identical regardless of packaging.

Q: Are there dimensional differences between these parts?

A: Yes. Minor dimensional variations exist: Tamura 3FS-428 is 41.50mm L × 34.83mm W, while both substitutes measure approximately 41.30mm L × 33.30mm W. These differences are within standard PCB mounting tolerances for through-hole components. Verify available PCB footprint space before substitution.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant?

A: Both certifications indicate RoHS compliance. ROHS3 refers to compliance with the most current RoHS directive (2011/65/EU as amended). All three parts meet current environmental compliance requirements.

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

A: Yes, provided PCB footprint space accommodates the minor dimensional variations. All three parts are electrically identical and carry Active product status with current RoHS compliance.