DST-7-12

Overview

The Signal Transformer DST-7-12 is a laminated core power transformer designed for board mount applications. It operates at 50/60 Hz and features dual primary windings rated for 115 VAC and 230 VAC, supporting parallel or series configurations. The secondary winding provides a center-tapped output of 12.6 V CT with an alternative 6.3 V configuration. With a power rating of 36 VA, the unit delivers secondary current ratings of 5.7 A in parallel mode and 2.85 A in series mode. It utilizes through-hole solder pin termination and measures 41.3 mm in length, 33.3 mm in width, and 33.3 mm in height.

Feature Summary

• Dual primary winding design supports flexible input voltage selection between 115 VAC and 230 VAC via parallel or series connection.
• Center-tapped secondary architecture allows for versatile output voltage configurations to suit diverse circuit requirements.
• Laminated core construction ensures stable performance within Class 2 safety standards for low-voltage applications.

Applications

• Industrial automation servo power systems
• General-purpose AC to DC power supply front ends
• Control panel isolation and voltage transformation

Procurement Notes

Verify that the specific order matches the required secondary current configuration, as the 36 VA rating applies differently to parallel versus series secondary connections. Confirm that the through-hole footprint dimensions align with the printed circuit board layout before finalizing procurement. Ensure compliance with Class 2 transformer regulations relevant to the target market.

Selection Notes

Select this model when a high-power 36 VA transformation is required in a compact laminated form factor. It is suitable for designs needing robust isolation between 115/230 VAC inputs and lower voltage secondary outputs. Consider the physical dimensions and through-hole mounting style during the initial schematic and PCB layout phase to ensure adequate clearance and mechanical stability.

Part Context

The DST-7-12 belongs to the Split/Tran DST series of board-mount power transformers manufactured by Bel Signal Transformer. This series is characterized by its use of laminated cores and standardized through-hole packaging, providing reliable electrical isolation for industrial and commercial electronic equipment requiring standardized voltage conversion.

Replacement Considerations

Direct substitutes within the same series include models with differing power ratings but compatible footprints, such as the DST-4-12 (6 VA) or DST-3-12 (2.4 VA), provided the application can accommodate lower power capabilities. Cross-series replacements require verification of pinout compatibility and thermal management requirements.