Equivalent & Substitute Parts for Tamura 3FD-528 Laminated Power Transformer

Part Overview

The Tamura 3FD-528 is a 12VA laminated core power transformer designed for through-hole mounting applications. It features dual primary and secondary windings with selectable output configurations (parallel 14V/840mA or series 28V/420mA) and dual input voltage options (115V or 230V). The transformer is RoHS compliant and maintains 2500Vrms isolation voltage, making it suitable for industrial and commercial power supply applications requiring galvanic isolation.

The 3FD-528 is an active product with established market availability. Equivalent substitute parts are identified based on matching electrical specifications, mechanical compatibility, and compliance certifications to support component procurement flexibility and supply chain continuity.

Substiute Parts

3FD-528

TamuraIn Stock: 6483FD-528 Datasheet

Current PartRFQ

DST-5-28

Signal TransformerIn Stock: 1208DST-5-28 Datasheet

DirectRFQ

FS28-420

Triad MagneticsIn Stock: 1483FS28-420 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Tamura 3FD-528 are qualified based on strict electrical and mechanical parameter matching within the laminated power transformer category. The substitution criteria are:

Electrical Parameters (Must Match Exactly):

• Power rating: 12VA
• Primary voltage options: 115V and 230V
• Secondary voltage configurations: Parallel 14V and Series 28V
• Output current ratings: Parallel 840mA and Series 420mA
• Winding configuration: Dual primary and dual secondary
• Isolation voltage: 2500Vrms
• Core type: Laminated

Mechanical Parameters (Must Match):

• Mounting type: Through hole
• Termination style: PC pin
• Physical dimensions within acceptable tolerance ranges

Compliance Parameters:

• RoHS compliance status (RoHS Compliant or ROHS3 Compliant acceptable)
• ECCN and HTSUS classifications match

All identified substitute parts meet these criteria and are classified as direct equivalents suitable for one-to-one replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

All three transformers—Tamura 3FD-528, Signal Transformer DST-5-28, and Triad Magnetics FS28-420—are active products with full compliance certifications and are electrically and mechanically equivalent for direct substitution.

Compliance Status:

• Tamura 3FD-528: RoHS Compliant
• Signal Transformer DST-5-28: ROHS3 Compliant, REACH Unaffected
• Triad Magnetics FS28-420: ROHS3 Compliant, REACH Unaffected

All parts share identical ECCN (EAR99) and HTSUS (8504.31.4035) classifications, confirming regulatory equivalence.

Dimensional Considerations: Physical dimensions vary slightly across manufacturers. The Tamura 3FD-528 has marginally larger footprint dimensions (48.50mm L × 41.52mm W × 38.00mm H) compared to Signal Transformer DST-5-28 (47.80mm L × 39.60mm W × 36.90mm H) and Triad Magnetics FS28-420 (47.63mm L × 39.67mm W × 36.50mm H). These variations remain within acceptable mechanical tolerance ranges for through-hole mounting applications and do not affect electrical performance or circuit compatibility.

Inventory Availability:

• Tamura 3FD-528: 629 pcs
• Signal Transformer DST-5-28: 1162 pcs
• Triad Magnetics FS28-420: 1464 pcs

Selection among these equivalents may be based on procurement lead times, inventory availability, or established supplier relationships, as all three deliver identical electrical performance and compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the Signal Transformer DST-5-28 or Triad Magnetics FS28-420 be used as direct replacements for the Tamura 3FD-528?

A: Yes. Both substitute parts are direct electrical and mechanical equivalents. All three transformers share identical power ratings (12VA), voltage configurations (115V/230V primary, 14V/28V secondary), current ratings (840mA parallel, 420mA series), winding configurations (dual primary and secondary), isolation voltage (2500Vrms), mounting type (through hole), and termination style (PC pin). They are suitable for one-to-one replacement in circuit applications.

Q: Are there any dimensional differences that affect PCB layout or mounting?

A: Minor dimensional variations exist. The Tamura 3FD-528 measures 48.50mm L × 41.52mm W × 38.00mm H, while the Signal Transformer DST-5-28 measures 47.80mm L × 39.60mm W × 36.90mm H, and the Triad Magnetics FS28-420 measures 47.63mm L × 39.67mm W × 36.50mm H. These differences are within standard mechanical tolerances for through-hole transformer mounting and do not impact circuit compatibility. PCB footprints designed for any of these transformers accommodate all three variants.

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

A: Both designations indicate compliance with Restriction of Hazardous Substances regulations. RoHS Compliant refers to the original RoHS Directive, while ROHS3 Compliant indicates compliance with the updated RoHS 3 Directive (2011/65/EU as amended). All three transformers meet current environmental compliance requirements for their respective markets.

Q: Do all three transformers support both 115V and 230V primary input?

A: Yes. All three transformers feature dual primary windings that allow configuration for either 115V or 230V input voltage. Secondary output remains selectable between parallel (14V/840mA) and series (28V/420mA) configurations regardless of primary voltage selection.

Q: Are there any differences in packaging that affect handling or storage?

A: The Tamura 3FD-528 is supplied in tube packaging, while both the Signal Transformer DST-5-28 and Triad Magnetics FS28-420 are supplied in box packaging. Packaging format does not affect component performance or electrical characteristics. All three transformers maintain identical moisture sensitivity level (MSL 1 or Not Applicable) and storage requirements.

Q: Can these transformers be used interchangeably in existing designs without circuit modification?

A: Yes. The electrical specifications, isolation voltage, winding configuration, and termination style are identical across all three transformers. No circuit modifications are required for substitution. Pin-to-pin compatibility is maintained for through-hole PC pin termination.