149Q

Overview

The Hammond Manufacturing 149Q is an open-frame audio transformer designed for PC board mounting. It features a single channel with a primary impedance of 300 ohms and a secondary impedance of 30/120 ohms. The unit has a rated power of 1 watt, a maximum DC current of 7 mA, and a maximum DC resistance of 19 ohms. Operating within a frequency range of 200 Hz to 15 kHz, it provides an insertion loss of 1 dB. The component utilizes radial pin terminals for connection and measures 1.06 inches in length, 0.82 inches in width, and 0.82 inches in height.

Feature Summary

• Open-frame construction suitable for direct printed circuit board integration
• Single-channel design optimized for signal level applications
• Radial pin terminal configuration for standard through-hole mounting

Applications

• Audio signal processing circuits
• Driver stage interfacing
• Signal level transformation

Procurement Notes

Verify the specific secondary impedance variant required for your circuit design, as the 149Q series includes configurations with different tap options such as 30/120 ohms. Confirm that the open-frame construction aligns with your enclosure requirements, as this model lacks external shielding. Ensure that the maximum DC current rating of 7 mA meets the operational demands of your application before finalizing the procurement order.

Selection Notes

Select the 149Q when an open-frame audio transformer with a 300-ohm primary impedance is needed for PCB mounting. This model is appropriate for applications requiring a 1-watt power rating and operation within the 200 Hz to 15 kHz frequency band. Consider the physical dimensions of 1.06 x 0.82 x 0.82 inches to ensure compatibility with your board layout constraints.

Part Context

The 149Q belongs to the Hammond Manufacturing 149 series of audio and signal transformers. This series is characterized by economical open-frame designs intended for general-purpose audio applications. The components are engineered for reliability in signal level tasks, offering a balance of performance and cost-effectiveness for industrial and commercial electronic equipment.

Replacement Considerations

The Hammond Manufacturing 149E serves as a related alternative within the same series, featuring a 300:30/120 ohm impedance ratio. Verify that the electrical specifications and physical footprint of the substitute part match the original design requirements.