DST-4-28

Overview

The DST-4-28 is a laminated power transformer from the Split/Tran Class 2 series by Signal Transformer. It features dual primary windings rated for 115 VAC and 230 VAC operation at 50 Hz or 60 Hz. The secondary configuration provides a center-tapped output of 28 V CT with individual legs at 14 V, supporting current ratings of 200 mA per leg and 400 mA total. With a 6 VA power rating, it utilizes through-hole solder pin termination. The unit measures 41.3 mm in length, 33.3 mm in width, and 33.3 mm in height.

Feature Summary

• Dual primary winding design enables flexible voltage selection between 115 VAC and 230 VAC inputs.
• Center-tapped secondary architecture delivers split voltage outputs suitable for full-wave rectification circuits.
• Class 2 insulation classification ensures compliance with safety standards for limited energy applications.

Applications

• Power supply units requiring isolated AC-to-DC conversion
• Audio equipment utilizing split-rail power architectures
• Industrial control systems with low-power isolation requirements

Procurement Notes

Verify that the specific order matches the DST-4-28 designation to ensure correct secondary voltage configuration. Confirm input voltage compatibility with the dual primary winding specification before integration. Check datasheet for thermal derating curves if operating near the 6 VA limit. Ensure mounting hardware accommodates the through-hole pin spacing and physical dimensions provided in the official documentation.

Selection Notes

Select this component when a 6 VA isolated transformer with a 28 V center-tapped secondary is required. The dual primary feature allows use in regions with varying mains voltages without changing the transformer model. Consider the physical footprint constraints as the unit requires specific board space for its laminated core structure and lead clearance.

Part Context

This part belongs to the DST series of Split/Tran transformers, designed for printed circuit board mounting. It shares mechanical form factors with other members like the DST-4-12 and DST-4-10 but differs in electrical ratings. The series is characterized by laminated cores and Class 2 safety ratings, distinguishing it from higher-power or different construction types within the manufacturer's portfolio.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Cross-referencing requires matching the 6 VA rating, 28 V CT secondary, and dual primary input specifications precisely.