109L

Overview

The Hammond Manufacturing 109L is a potted audio transformer designed for signal coupling applications. It features a single-channel configuration with through-hole pin terminals for secure board mounting. The unit operates within a frequency range of 300 Hz to 50 kHz, ensuring effective performance across standard audio bands. Electrical specifications include a primary impedance of 10k ohms center-tapped and a secondary impedance of 3.2 ohms. The maximum DC resistance is rated at 700 ohms, with a power rating of 2 W. Physical dimensions are approximately 1.315 inches in length, 0.93 inches in width, and 0.92 inches in height.

Feature Summary

• Potted construction provides environmental protection and mechanical stability for the internal windings.
• Center-tapped primary winding facilitates balanced circuit interfacing and impedance matching.
• Through-hole pin terminal design ensures reliable integration into printed circuit boards.

Applications

• Audio signal coupling in amplifier stages
• Impedance matching between audio components
• Balanced-to-unbalanced signal conversion

Procurement Notes

Verify the specific model suffix against official Hammond Manufacturing documentation to confirm electrical parameters, as variations exist within the series. Confirm that the secondary impedance matches the target application requirements, distinguishing this unit from similar models with different secondary ratings. Ensure compatibility with through-hole assembly processes and verify RoHS compliance status if required by project specifications.

Selection Notes

Select this component when a potted audio transformer with a 10k center-tapped primary and low-impedance secondary is required. Consider the physical footprint constraints relative to the 1.315-inch length and 0.92-inch height. Evaluate the 2 W power rating against the expected signal levels to ensure adequate headroom without saturation. Compare against other series members to identify the optimal impedance transformation ratio for the specific circuit topology.

Part Context

The 109L belongs to the Hammond 109 series of audio transformers, which are characterized by their potted epoxy construction and robust mechanical design. This series is widely utilized in professional audio equipment and industrial signal processing systems where reliability and consistent electrical performance are critical. The manufacturing process emphasizes durability and long-term stability under varying environmental conditions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Consult Hammond Manufacturing technical support or authorized distributors for direct equivalents or cross-reference data based on specific impedance and dimensional requirements.