161E28-BULK

Overview

The Hammond Manufacturing 161E28-BULK is a low voltage power transformer designed for printed circuit board (PCB) mounting. It features a single primary winding rated at 115 VAC and a dual secondary winding configuration providing 28 VAC center-tapped output. The unit has a power rating of 1.2 VA with a secondary current capacity of 40 mA. Constructed for through-hole installation via solder pins, it operates within a temperature range of 0°C to +130°C at a frequency of 60 Hz. The component measures 1.38 inches in length, 1.13 inches in width, and 1.19 inches in height.

Feature Summary

• Low profile design suitable for space-constrained PCB applications
• Center-tapped secondary winding for dual polarity or rectification circuits
• Through-hole solder pin termination for secure board attachment
• High thermal tolerance supporting operation up to 130°C

Applications

• Low power electronic control systems
• Signal processing circuitry requiring isolated AC sources
• Industrial instrumentation panels
• Consumer electronics internal power stages

Procurement Notes

Verify the specific suffix BULK indicates standard bulk packaging rather than tape-and-reel when confirming order specifications. Ensure the primary voltage matches the local supply frequency and amplitude. Confirm that the 1.2 VA rating meets the load requirements of the target circuit to prevent overheating. Check RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this model when a compact, low-power transformer is needed for direct PCB integration. The 115V primary input suits regions with compatible mains voltage standards. Consider the physical dimensions against available board real estate. The center-tapped output is ideal for full-wave rectification setups requiring balanced positive and negative rails from a single source.

Part Context

This component belongs to the 161 series of low voltage PCB mount transformers from Hammond Manufacturing. These units are engineered for general-purpose isolation and voltage transformation in small form factor designs. The series offers various voltage and wattage combinations to accommodate diverse low-power electronic requirements while maintaining consistent mounting footprints.

Replacement Considerations

Cross-reference tools may identify parametrically similar parts from other manufacturers. Verify that any substitute maintains the same 115V primary, 28V CT secondary, and 1.2 VA rating. Ensure mechanical compatibility regarding lead spacing and overall envelope dimensions to fit existing PCB layouts without modification.