TTC-105-1

Overview

The Tamura TTC-105-1 is a telecommunications audio transformer designed for signal coupling applications. It features a primary impedance of 600 Ohms and a secondary impedance of 600 Ohms center-tapped (600CT). The device operates within a frequency range of 660Hz to 3.5kHz with a turns ratio of 1:1. Key electrical specifications include a maximum DC resistance of 71 Ohms on the primary side and 117 Ohms on the secondary side. It provides an isolation voltage of 1500VRMS and utilizes a through-hole mounting style.

Feature Summary

• Designed specifically for modem and telecommunications signal coupling
• Provides galvanic isolation between circuit sections
• Supports standard 600 Ohm telecommunication line impedances

Applications

• Modem interface circuits
• Telecommunications signal processing
• Audio signal coupling in communication equipment

Procurement Notes

Verify the specific datasheet version when sourcing, as manufacturer documentation may update pin configurations or mechanical dimensions over time. Confirm that the component meets the required isolation voltage standards for your specific application environment. Ensure compatibility with existing PCB footprints, particularly regarding the through-hole lead spacing and overall physical height constraints during assembly.

Selection Notes

Select this component when a 1:1 impedance transformation is required for 600 Ohm systems. It is suitable for applications operating above 660Hz where low insertion loss is critical. Consider the physical size and through-hole requirements against surface-mount alternatives if space is limited. Evaluate the DC resistance values to ensure they align with the power budget and signal integrity requirements of the source and load circuits.

Part Context

This part belongs to the Tamura TTC series of audio and signal transformers. These components are widely used in legacy and modern telecom infrastructure. The series offers various impedance ratios and frequency responses tailored for different transmission standards. The TTC-105-1 represents a specific configuration optimized for balanced line coupling in voice and data modulation environments.

Replacement Considerations

Direct substitutes must match the 600:600 impedance ratio, 1:1 turns ratio, and similar frequency response characteristics. Verify that any alternative component maintains equivalent isolation ratings and physical dimensions for board replacement.