228H

Power Transformers Overview

The Hammond Manufacturing 228H is a semi-toroidal power transformer designed for PCB mounting. It features an epoxy-cast construction for environmental protection and mechanical stability. The unit operates with a 115V primary voltage. The secondary winding provides dual outputs: 40V at 250mA and 20V at 500mA, resulting in a total apparent power rating of 10VA. This component is suitable for applications requiring compact, low-voltage AC power conversion.

Power Transformers Feature Summary

• Semi-toroidal core geometry for efficient magnetic coupling
• Epoxy-cast encapsulation for moisture and chemical resistance
• Through-hole PCB mounting configuration for secure installation

Power Transformers Applications

• Low voltage power supply circuits
• Electronic control systems
• Instrumentation power modules

Power Transformers Procurement Notes

Verify the specific secondary voltage and current ratings against the target circuit requirements before procurement. Confirm that the PCB layout accommodates the through-hole pin spacing and physical dimensions of the epoxy-cast body. Ensure the operating environment does not exceed the thermal limits defined in the official datasheet.

Power Transformers Selection Notes

Select this model when a compact, low-voltage transformer with integrated mounting is required. The 10VA rating suits light-load applications. Consider the semi-toroidal shape for space-constrained designs where standard laminated transformers are too bulky. Verify input voltage compatibility with the 115V primary specification.

Power Transformers Part Context

The 228H belongs to the Hammond 228 Series of power transformers. This series focuses on providing reliable, isolated power conversion for electronic assemblies. The components are characterized by their robust epoxy casting and standardized mounting options, ensuring consistent performance across various industrial and commercial electronic products.

Power Transformers Replacement Considerations

Direct substitutes must match the 10VA rating, 115V primary, and identical secondary voltages (40V/20V) and currents (250mA/500mA). Verify footprint compatibility for PCB mounting. Alternative semi-toroidal transformers from other manufacturers may be considered if electrical parameters and physical dimensions align precisely.