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Product Detailed Parameters
- Description：AUDIO XFMR 4K / 2K 500/500 TH
- Series：148
- Mfr：Hammond Manufacturing
- Package：Bulk
- Mounting Type：Through Hole
- Size / Dimension：0.820" L x 0.680" W (20.83mm x 17.27mm)
- Height - Seated (Max)：0.690" (17.53mm)
- Termination Style：PC Pin
- Turns Ratio - Primary:Secondary：-
- Impedance - Primary (Ohms)：4k
- Impedance - Secondary (Ohms)：2k, 500/500
- DC Resistance (DCR) - Primary：540Ohm
- DC Resistance (DCR) - Secondary：230Ohm
- Transformer Type：Economical Open Type
- Frequency Range：200Hz ~ 15kHz
- Frequency Response：±1dB
- Voltage - Isolation：-
- Insertion Loss：0.5dB
- Return Loss：-
- Power Level：75mW
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 148K is an audio signal transformer designed for open-frame, through-hole PC board mounting. It functions as a driver transformer with a single channel and operates within a frequency range of 200 Hz to 15 kHz. The primary coil impedance is specified at 4 kΩ, while the secondary coil impedance is configured for 500 Ω or 2 kΩ options. This component utilizes pin terminals for secure electrical connections.
Feature Summary
- Open-frame construction suitable for direct printed circuit board integration
- Single-channel audio signal transformation capability
- Through-hole pin terminal mounting for stable PCB attachment
Applications
- Audio driver circuits requiring impedance matching
- Signal isolation in audio processing systems
- PCB-mounted audio interface modules
Procurement Notes
Verify the specific secondary impedance configuration (500 Ω or 2 kΩ) required for your application before ordering, as variants exist within this model series. Confirm that the open-frame design aligns with your enclosure requirements, as it lacks protective housing. Ensure compatibility with standard through-hole assembly processes and check RoHS compliance status if environmental regulations apply to your manufacturing line.
Selection Notes
Select the 148K when a dedicated audio driver transformer is needed for impedance transformation between stages. Consider the operating frequency range of 200 Hz to 15 kHz to ensure suitability for your audio bandwidth. Evaluate the physical dimensions and pin spacing against your PCB layout constraints. Compare against other Hammond audio transformers if different impedance ratios or mounting styles are necessary.
Part Context
This component belongs to the Hammond Manufacturing audio and signal transformer product line. It is categorized under pin terminal transformers intended for electronic circuit applications. The 148K series provides specialized magnetic components for audio signal handling, distinct from power transformers or general-purpose signal isolators.
