108E

Overview

The Hammond Manufacturing 108E is a general-purpose audio transformer designed for through-hole mounting. It features a primary impedance of 600 ohms center-tapped and a secondary impedance of 3.2 ohms, with a turns ratio of 13.71:1. The device operates within a frequency range of 300Hz to 50kHz and supports a power level of 500mW. Electrical characteristics include a primary DC resistance of 54 ohms and a secondary DC resistance of 400 milliohms. The unit provides 100VRMS isolation voltage and exhibits a frequency response of ±1.75dB. Physical dimensions are 26.16mm in length, 19.56mm in width, and 19.56mm in maximum installation height.

Feature Summary

• Miniature epoxy encapsulated construction for durability
• Center-tapped primary winding configuration
• Through-hole PC pin termination style

Applications

• Audio signal coupling circuits
• Impedance matching applications
• Telecommunications equipment

Procurement Notes

Verify the specific impedance configuration required for your circuit design, as the 108E utilizes a 600-ohm center-tapped primary and a low-impedance 3.2-ohm secondary. Confirm that the 500mW power rating aligns with your operational requirements. Ensure compatibility with through-hole assembly processes given the PC pin termination style. Check RoHS compliance status if environmental regulations apply to your manufacturing region.

Selection Notes

Select the 108E when a step-down audio transformation from 600 ohms to 3.2 ohms is necessary. Consider this component for space-constrained designs due to its miniature epoxy encapsulation. Evaluate the ±1.75dB frequency response tolerance against your audio fidelity requirements. Ensure the 100VRMS isolation voltage meets safety standards for your specific application environment.

Part Context

The 108E belongs to the 108 series of audio transformers manufactured by Hammond Manufacturing. This series focuses on compact, general-purpose solutions for audio and telecommunications. Similar models in the lineup may offer different impedance ratios or frequency ranges, such as the 106E which features a 600-ohm secondary. The 108E specifically targets applications requiring precise impedance matching between high-impedance sources and low-impedance loads.

Replacement Considerations

Direct substitutes within the same series include variations with different secondary impedances. Verify that any replacement maintains the 600-ohm center-tapped primary requirement. Ensure physical footprint compatibility for through-hole mounting. Cross-reference frequency response and power handling capabilities to guarantee equivalent performance in the target circuit.