TTC-5028

Overview

The Tamura TTC-5028 is a through-hole audio transformer designed for voice and modem applications. It features a primary impedance of 600 Ohms and a secondary impedance of 470 Ohms, providing a 1:1 transformation ratio. The device operates within a frequency range of 300Hz to 3.5kHz, supporting standard telecommunication signal bands. Key electrical specifications include a maximum insertion loss of 2.5dB at 1kHz and a power level range of -40dB to 4dB. The component has a maximum seated height of 14.80mm and is UL1950 3rd Edition approved.

Feature Summary

• Provides galvanic isolation between voice and modem circuits with a 1:1 impedance ratio
• Optimized for standard telecommunication frequency bands from 300Hz to 3.5kHz
• Complies with UL1950 safety standards for third edition requirements

Applications

• Voice line interface circuits in telecommunications equipment
• Modem signal coupling and isolation
• Telecom terminal adapters and data modems

Procurement Notes

Verify the specific datasheet version against the manufacturer's official documentation to confirm current compliance with UL1950 3rd Edition standards. Ensure that the through-hole package dimensions align with the PCB footprint requirements, specifically noting the maximum seated height of 14.80mm. Confirm that the 600:470 Ohm impedance ratio matches the system design specifications for both primary and secondary sides before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring isolation between voice and data lines within standard telephone frequency ranges. The 600 Ohm primary impedance is suitable for traditional telephony interfaces, while the 470 Ohm secondary side accommodates specific modem input requirements. Consider the through-hole mounting style if surface-mount alternatives are not feasible for the mechanical constraints of the assembly.

Part Context

The TTC-5028 belongs to Tamura’s series of audio and telecom transformers, engineered for reliable signal transmission in legacy and modern communication hardware. As a dedicated voice/modem line transformer, it addresses the need for impedance matching and noise reduction in analog signal paths. Its design supports robust performance in environments where electrical isolation is critical for maintaining signal integrity across network boundaries.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Verify compatibility with existing circuit designs if considering alternative manufacturers, ensuring identical impedance ratios and frequency response characteristics are maintained.