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Product Detailed Parameters
- Description：XFMR 600 / 1.2K 600/600 TH
- Series：TTC
- Mfr：Tamura
- Package：Bulk
- Mounting Type：Through Hole
- Size / Dimension：0.799" L x 1.201" W (20.30mm x 30.50mm)
- Height - Seated (Max)：0.500" (12.70mm)
- Termination Style：PC Pin
- Turns Ratio - Primary:Secondary：1:01
- Impedance - Primary (Ohms)：600
- Impedance - Secondary (Ohms)：1.2k, 600/600
- DC Resistance (DCR) - Primary：75Ohm
- DC Resistance (DCR) - Secondary：170Ohm
- Transformer Type：Data/Voice Coupling
- Frequency Range：300Hz ~ 3.5kHz
- Frequency Response：-1.6dB ~ 0.3dB
- Voltage - Isolation：1500VRMS @ 1 Minute
- Insertion Loss：1.6dB Max @ 1kHz
- Return Loss：14dB Min @ 1kHz
- Power Level：-45dB ~ 10dB
- Operating Temperature：-
- Approval Agency：CSA-C22.2 No. 66-M1988, UL1863
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Overview
The Tamura TTC-174 is a telecommunications isolation transformer designed for modem applications. It features a toroidal ferrite core construction with air cooling and PC pin through-hole mounting. The device has six pins and measures 20.30mm x 30.50mm. Key electrical parameters include a primary impedance of 75 Ohms and secondary impedances of 600/600 Ohms or 1.2k Ohms. It offers a minimum return loss of 14dB at 1kHz and supports a maximum DC current of 50mA.
Feature Summary
- Provides galvanic isolation for modem signal integrity
- Utilizes toroidal ferrite core for efficient magnetic coupling
- Supports standard telecommunication impedance matching
Applications
- Modem interface circuits
- Telecommunications line protection
- Signal isolation in data transmission systems
Procurement Notes
Verify the specific secondary impedance configuration (600/600 Ohms vs. 1.2k Ohms) required by your circuit design, as variations exist within the product series. Confirm that the 6-pin PC pin through-hole termination matches your PCB layout constraints. Ensure the component status is active for long-term supply availability.
Selection Notes
Select this component when designing modems requiring 75 Ohm primary to 600 Ohm secondary isolation. Consider the physical dimensions of 20.30mm x 30.50mm for board space allocation. Evaluate the 14dB return loss specification against your signal quality requirements for high-frequency performance.
Part Context
The TTC-174 belongs to Tamura's TTC series of audio and signal transformers. This series is widely used in legacy and modern telecom equipment. The part is distinct from power transformers due to its specific impedance ratios and low-power signal handling capabilities.
Replacement Considerations
No public confirmed substitute part numbers are available in the provided documentation. Designers should consult official Tamura catalogs for equivalent models with matching impedance and form factor specifications.
FAQ
What is the primary impedance of the TTC-174?
The primary impedance is 75 Ohms.
What is the minimum return loss specification?
The minimum return loss is 14dB at 1kHz.
