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Product Detailed Parameters
- Description：AUDIO XFMR 1K / 240, 60/60 TH
- Series：149
- Mfr：Hammond Manufacturing
- Package：Bulk
- Mounting Type：Through Hole
- Size / Dimension：1.060" L x 0.820" W (26.92mm x 20.83mm)
- Height - Seated (Max)：0.820" (20.83mm)
- Termination Style：PC Pin
- Turns Ratio - Primary:Secondary：-
- Impedance - Primary (Ohms)：1k
- Impedance - Secondary (Ohms)：240, 60/60
- DC Resistance (DCR) - Primary：155Ohm
- DC Resistance (DCR) - Secondary：24Ohm
- Transformer Type：Economical Open Type
- Frequency Range：200Hz ~ 15kHz
- Frequency Response：±1dB
- Voltage - Isolation：-
- Insertion Loss：0.5dB
- Return Loss：-
- Power Level：200mW
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 149H is an open-frame audio and signal transformer designed for PC board mounting. It functions as a driver transformer with a primary impedance of 1000 ohms and dual secondary impedances of 60 ohms and 240 ohms. The component operates within a frequency range of 200 Hz to 15 kHz and utilizes radial pin terminals for connection. It features a single channel configuration and is constructed for standard signal level applications.
Feature Summary
- Open-frame construction for direct printed circuit board integration
- Driver topology with split secondary winding options
- Radial pin terminal termination style
Applications
- Audio signal driver circuits
- Signal level transformation in electronic systems
- PC board mounted audio interface stages
Procurement Notes
Verify the specific impedance configuration required for your design, as this model provides dual secondary values (60/240 ohms). Confirm that the open-frame construction meets your environmental protection needs, as it lacks an external enclosure. Ensure the radial pin spacing aligns with your PCB footprint specifications before finalizing the order.
Selection Notes
Select the 149H when a driver transformer with a 1000-ohm primary is required for audio or signal applications. This model is suitable for designs needing flexible secondary impedance matching via the 60/240 ohm taps. Consider the open-frame form factor if space constraints allow for exposed components on the assembly.
Part Context
This component belongs to the Hammond Manufacturing Series 149 line of audio and signal transformers. These units are characterized by their open-frame design and radial pin terminal connections, intended for straightforward insertion into printed circuit boards. The series supports various impedance combinations tailored for different audio and signal processing requirements.
Replacement Considerations
The Hammond 149E serves as a related variant within the same series but features different impedance ratings (300:30/120 ohms). Verify that the primary and secondary impedance values of the replacement part match the electrical requirements of the target circuit to ensure proper signal transfer and loading characteristics.
