DST-3-28 Equivalent & Substitute Parts

Part Overview

The DST-3-28 is a laminated core power transformer manufactured by Signal Transformer, rated at 2.4VA with dual primary and secondary windings. The transformer supports dual voltage inputs (115V/230V) and provides configurable output voltages through series/parallel winding configuration (14V parallel or 28V series). This component is designed for through-hole mounting applications with PC pin termination and maintains active product status with full RoHS3 compliance.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter set, enabling procurement flexibility and supply chain continuity.

Substiute Parts

DST-3-28

Signal TransformerIn Stock: 1095DST-3-28 Datasheet

Current PartRFQ

3FD-328

TamuraIn Stock: 23443FD-328 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 3FD-328 manufactured by Tamura qualifies as a direct substitute for the DST-3-28 based on the following critical parameters:

• Identical power rating (2.4VA)
• Matching primary voltage configuration (115V, 230V dual input)
• Matching secondary voltage output (Parallel 14V, Series 28V)
• Identical maximum output current specifications (Parallel 170mA, Series 85mA)
• Identical winding configuration (Dual primary, Dual secondary)
• Matching core type (Laminated)
• Identical mounting type (Through Hole) and termination style (PC Pin)
• Equivalent isolation voltage (2500Vrms)
• Compliant regulatory status (RoHS Compliant)

Physical dimensions vary slightly between manufacturers, and packaging differs (Box vs. Tube), but electrical and functional parameters remain equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the DST-3-28 and 3FD-328 maintain active product status and meet regulatory compliance requirements. The DST-3-28 carries RoHS3 certification, while the 3FD-328 carries RoHS compliance. Selection between these parts should be based on:

• PCB layout constraints: The 3FD-328 has slightly larger physical dimensions (35.56mm L × 31.00mm W × 32.10mm H) compared to the DST-3-28 (34.90mm L × 28.60mm W × 30.80mm H). Verify available board space before substitution.
• Packaging requirements: DST-3-28 is supplied in Box packaging; 3FD-328 is supplied in Tube packaging. Confirm packaging compatibility with assembly processes.
• Supply availability: Current inventory levels differ (DST-3-28: 1036 pcs; 3FD-328: 2296 pcs).

Both parts are electrically and functionally equivalent for applications requiring 2.4VA laminated core transformers with dual voltage input and configurable output.

Frequently Asked Questions (FAQ)

Q: Can the 3FD-328 be used as a direct replacement for the DST-3-28 in existing designs?

A: Yes, provided that PCB layout accommodates the slightly larger physical dimensions of the 3FD-328. All electrical parameters, winding configurations, and isolation specifications are equivalent.

Q: What are the key differences between these parts?

A: The primary differences are physical dimensions and packaging format. The 3FD-328 is approximately 0.66mm longer, 2.40mm wider, and 1.30mm taller than the DST-3-28. The DST-3-28 is packaged in boxes; the 3FD-328 is packaged in tubes.

Q: Are both parts RoHS compliant?

A: Yes. The DST-3-28 is RoHS3 compliant. The 3FD-328 is RoHS compliant. Both meet environmental regulatory requirements.

Q: What voltage configurations are supported?

A: Both transformers support dual primary inputs (115V or 230V) and dual secondary outputs configured as either 14V (parallel) or 28V (series) through winding connection selection.

Q: What is the maximum output current for each configuration?

A: In parallel configuration (14V output), maximum current is 170mA. In series configuration (28V output), maximum current is 85mA.

Q: Are these transformers suitable for through-hole PCB assembly?

A: Yes, both parts are designed for through-hole mounting with PC pin termination.