14A-20-28

Overview

The Signal Transformer 14A-20-28 is a laminated core power transformer designed for through-hole mounting. It features dual primary windings rated for 115V and 230V AC parallel operation, supporting 50/60Hz frequencies. The secondary configuration provides dual outputs of 14V and 28V in parallel or series arrangements. With a maximum power rating of 20VA, it delivers up to 1.44A in parallel mode and 720mA in series mode. The unit incorporates an 8-terminal PC pin interface and ensures electrical isolation of 4000Vrms between windings.

Feature Summary

• Supports international voltage standards via selectable primary winding configurations
• Provides flexible secondary output options for parallel or series connection
• Ensures high-voltage safety with robust insulation barriers

Applications

• Industrial control panel power supplies
• Medical equipment internal power systems
• Test and measurement instrument power stages

Procurement Notes

Verify the specific terminal configuration and physical footprint against the target PCB layout before ordering. Confirm that the required current ratings align with the intended load conditions, as performance varies between parallel and series secondary modes. Ensure compliance with regional safety certifications relevant to the final assembly environment.

Selection Notes

Select this component when a compact solution is needed for standard AC line voltages. Consider the thermal dissipation requirements based on the 20VA rating. Evaluate the mechanical stability provided by the through-hole pins compared to surface-mount alternatives. Check if the 4000Vrms isolation meets the specific safety regulations for the application sector.

Part Context

This model belongs to the 14A Series, which offers versatile power transformation capabilities. The series is characterized by its ability to handle multiple input voltages without requiring different part numbers for distinct regions. It serves as a reliable interface between mains power and low-voltage DC conversion stages in various electronic assemblies.

Replacement Considerations

Signal Transformer 14A-5.0R-28 is documented as a similar alternative. Verify that the lower 5VA rating of the substitute meets the power requirements of the circuit. Ensure the physical dimensions and terminal spacing are compatible with the existing board design.