Equivalent & Substitute Parts for TTC-10 Telephone Coupling Transformer

Part Overview

The TTC-10 is a 600 ohm telephone coupling transformer manufactured by Tamura, designed for data/voice coupling applications in the 300Hz to 3.5kHz frequency range. This transformer features a 1:0.736 turns ratio with 600/600 ohm impedance configuration and through-hole mounting for PC pin termination.

The TTC-10 has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for ongoing production, maintenance, and repair applications. Substitute parts must maintain compatibility with the original electrical specifications and mechanical form factor constraints.

Substiute Parts

TTC-10

TamuraIn Stock: 818TTC-10 Datasheet

Current PartRFQ

TY-302P

Triad MagneticsIn Stock: 1009TY-302P Datasheet

DirectRFQ

TY-300P

Triad MagneticsIn Stock: 1150TY-300P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TTC-10 are identified based on strict alignment with the following core parameters:

Primary Matching Criteria:

• Impedance configuration: 600 ohm primary and 600/600 ohm secondary
• Transformer type: Data/Voice Coupling
• Frequency range: 300Hz ~ 3.5kHz
• Mounting type: Through Hole
• Termination style: PC Pin

Secondary Compatibility Factors:

• Voltage isolation rating: minimum 1500V
• Physical form factor: dimensions and height suitable for PCB integration

The TY-302P and TY-300P from Triad Magnetics satisfy these core electrical and mechanical requirements. Both parts maintain the required impedance configuration, frequency response band, and through-hole PC pin termination. Both are active products with current manufacturing status, ensuring long-term availability compared to the obsolete TTC-10.

Parameter Comparison

Engineering Selection Recommendations

TY-302P Selection Criteria:

The TY-302P is an active product with ROHS3 compliance and REACH unaffected status. This part demonstrates lower insertion loss (0.65dB typical) compared to the TTC-10 (1.2dB maximum) and provides measurable return loss performance (32dB typical). The TY-302P maintains the required 600/600 ohm impedance configuration and 300Hz to 3.5kHz frequency band. Physical dimensions (26.42 x 24.38mm) and seated height (22.10mm) are slightly larger than the TTC-10, requiring PCB layout verification for space-constrained applications.

TY-300P Selection Criteria:

The TY-300P is an active product with ROHS3 compliance and REACH unaffected status. This part offers physical dimensions (20.62 x 17.78mm) and seated height (18.80mm) closely aligned with the TTC-10 footprint, minimizing PCB redesign requirements. The TY-300P maintains the required 600/600 ohm impedance configuration and 300Hz to 3.5kHz frequency band. Insertion loss is 0.8dB typical with 30dB typical return loss. The higher primary DC resistance (172 ohm) compared to the TTC-10 (57 ohm) requires circuit analysis to confirm compatibility with existing impedance matching networks.

Both substitute parts carry active product status, ensuring component availability and manufacturing continuity. Selection between TY-302P and TY-300P depends on specific circuit requirements regarding turns ratio, DC resistance characteristics, and available PCB space.

Frequently Asked Questions (FAQ)

Q: Can the TY-302P or TY-300P be used as direct pin-for-pin replacements for the TTC-10?

A: Both parts feature through-hole PC pin termination compatible with the TTC-10 mounting style. However, physical dimensions differ. The TY-300P dimensions (20.62 x 17.78mm, height 18.80mm) are closer to the TTC-10 (20.30 x 17.50mm, height 19.10mm). The TY-302P is larger (26.42 x 24.38mm, height 22.10mm) and may require PCB layout modifications. Pin configuration must be verified against the specific circuit schematic.

Q: What is the significance of the different turns ratios between these parts?

A: The TTC-10 has a 1:0.736 turns ratio, while TY-302P has 1:1.47 and TY-300P has 1:2.48. Turns ratio affects voltage transformation and impedance matching characteristics. Selection depends on the specific circuit application and whether the transformer is used for impedance matching, isolation, or signal level adjustment. Circuit analysis is required to determine which turns ratio is appropriate for the application.

Q: Are there compliance or regulatory differences between the TTC-10 and substitute parts?

A: The TTC-10 lists CSA-C22.2 No. 66-M1988 and UL1459 approvals. The TY-302P and TY-300P do not specify approval agency certifications but are ROHS3 compliant and REACH unaffected. Both substitute parts meet the 1500V isolation requirement. Regulatory compliance verification should be performed based on the end-application requirements and regional standards.

Q: How do insertion loss and return loss specifications affect substitution?

A: The TTC-10 specifies 1.2dB maximum insertion loss at 1kHz. The TY-302P provides 0.65dB typical insertion loss and the TY-300P provides 0.8dB typical insertion loss, both representing improved performance. Return loss specifications (32dB for TY-302P, 30dB for TY-300P) indicate signal reflection characteristics. Lower insertion loss and higher return loss generally indicate better signal fidelity in data/voice coupling applications.

Q: What PCB layout considerations apply when substituting these parts?

A: The TY-300P offers the closest physical match to the TTC-10, minimizing layout changes. The TY-302P requires additional PCB space due to larger dimensions. Verify that the selected substitute part fits within the available mounting area and that clearance requirements for adjacent components are maintained. Confirm pin spacing and hole diameter compatibility with existing PCB tooling.

Q: Why are the TY-302P and TY-300P both listed as substitutes if they have different specifications?

A: Both parts satisfy the core substitution criteria: 600/600 ohm impedance, data/voice coupling function, 300Hz to 3.5kHz frequency range, through-hole mounting, and PC pin termination. The different turns ratios and DC resistance values make each part suitable for different circuit configurations. The appropriate choice depends on the specific application requirements and circuit design parameters.