DST-2-20

Overview

The Signal Transformer DST-2-20 is a Class 2 laminated power transformer designed for board mount applications. It features dual primary windings rated for 115 VAC and 230 VAC input, supporting 50 Hz and 60 Hz operation frequencies. The secondary configuration provides dual outputs of 20 VCT/10 V with corresponding current ratings of 55 mA/110 mA. With a power rating of 1.1 VA, it utilizes through-hole solder pin termination. The unit measures 34.9 mm in length, 28.6 mm in width, and 24.6 mm in height, offering 2500 Vrms isolation.

Feature Summary

• Dual primary winding capability for flexible 115V or 230V AC input selection
• Dual secondary winding design providing center-tapped voltage options
• Class 2 safety classification for restricted energy level applications
• Laminated core construction optimized for 50/60 Hz frequency ranges

Applications

• Low-power electronic equipment requiring isolated DC power supplies
• Control circuits utilizing Class 2 limited energy sources
• Industrial instrumentation panels needing compact isolation transformers
• Consumer electronics with standard line voltage inputs

Procurement Notes

Verify the specific datasheet version to confirm compliance with current RoHS and REACH directives. Ensure that the procurement channel provides original manufacturer documentation to validate the 2500 Vrms isolation rating and UL/CSA approval status. Confirm that the through-hole package dimensions match the PCB layout requirements before finalizing orders.

Selection Notes

Select this component when a low-power (1.1 VA) isolated supply is required for 50/60 Hz systems. The dual primary winding allows compatibility with both 115V and 230V mains without rewiring. Choose this model over higher VA variants if space constraints limit the footprint to approximately 34.9mm x 28.6mm. Ensure the secondary current demand does not exceed 110mA per leg.

Part Context

The DST-2-20 belongs to the Split/Tran™ DST series by Bel Signal Transformer. This series is characterized by split bobbin construction which enhances electrical isolation and reduces inter-winding capacitance. The DST series offers various power ratings from 1.1 VA to higher capacities, all sharing similar mounting styles and core technologies for standardized design integration.

Replacement Considerations

• DST-2-10
• DST-2-28

FAQ

What is the isolation voltage rating?

The DST-2-20 provides an isolation voltage of 2500 Vrms between primary and secondary windings.

Does the transformer support both 50 Hz and 60 Hz frequencies?

Yes, the DST-2-20 is rated for operation at both 50 Hz and 60 Hz frequencies.