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Product Detailed Parameters
- Description：AUDIO XFMR 160 / 80, 20/20 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)：160
- Impedance - Secondary (Ohms)：80, 20/20
- DC Resistance (DCR) - Primary：24Ohm
- DC Resistance (DCR) - Secondary：7Ohm
- 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 149C is an open-frame audio signal transformer designed for PC board mounting. It functions as a driver transformer with a single channel configuration. The primary coil impedance is specified at 160 ohms, while the secondary side offers dual taps at 20 and 80 ohms. This component supports a frequency range of 200 Hz to 15 kHz. It utilizes radial pin terminals for connection and operates with a maximum DC current rating of 42 mA.
Feature Summary
- Open-frame construction facilitates direct printed circuit board integration
- Dual-tap secondary winding provides flexible impedance matching options
- Radial pin terminal design ensures secure mechanical and electrical attachment
Applications
- Audio signal coupling in amplifier circuits
- Driver stage interfacing in audio equipment
- Impedance matching between audio stages
Procurement Notes
Verify the specific impedance configuration against project requirements, noting the 160-ohm primary and 20/80-ohm secondary taps. Confirm that the open-frame design aligns with enclosure constraints and thermal management needs. Ensure compatibility with existing PCB layouts regarding radial pin spacing and mounting orientation before finalizing procurement.
Selection Notes
Select this model when a dedicated audio driver transformer with dual secondary impedance options is required. The 160-ohm primary suits standard driving sources, while the selectable 20 or 80-ohm secondaries allow adaptation to varying load impedances. Consider the open-frame form factor for applications where housing integration is managed separately by the system designer.
Part Context
This component belongs to the Hammond Manufacturing line of audio and signal transformers. It is part of a series offering various impedance ratios for different audio application needs. The 149C specifically addresses scenarios requiring a driver function with flexible output impedance selection within a compact, board-mountable format.
Replacement Considerations
The 149E serves as a comparable alternative within the same product family, featuring a 300-ohm primary and 30/120-ohm secondary configuration. Verify that the impedance transformation ratio and physical dimensions of the substitute are compatible with the existing circuit design and PCB footprint.
