TTC-105 Equivalent & Substitute Parts Reference

Part Overview

The TTC-105 is a 600 Ohm impedance audio transformer manufactured by Tamura, designed for data and voice coupling applications. This through-hole mounted transformer operates across the 660Hz to 3.5kHz frequency range with a 1:1 turns ratio and provides 1500VRMS isolation at 1 minute. The part is currently in active production status with 991 pieces available in new original inventory.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances for impedance matching, frequency response, isolation voltage, and mounting compatibility. Substitution becomes necessary when the primary part reaches end-of-life status, inventory constraints occur, or alternative sourcing is required for supply chain optimization.

Substiute Parts

TTC-105

TamuraIn Stock: 1080TTC-105 Datasheet

Current PartRFQ

TY-400P

Triad MagneticsIn Stock: 3476TY-400P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TTC-105 are qualified based on the following electrical and mechanical compatibility criteria:

Primary Matching Criteria:

• Impedance matching: Primary and secondary impedances must both be 600 Ohms
• Transformer type classification: Data/Voice Coupling category
• Mounting configuration: Through-hole termination with PC pin style
• Isolation voltage: Minimum 1500V isolation capability
• Frequency response coverage: Operating range must encompass the 660Hz to 3.5kHz band

Secondary Compatibility Factors:

• Turns ratio tolerance: Deviations from 1:1 are acceptable if impedance matching is maintained
• DC resistance: Variations within typical manufacturing tolerances
• Insertion loss performance: Must remain within acceptable limits for audio coupling applications
• Physical dimensions: Package footprint compatibility with through-hole PCB layouts
• Compliance certifications: RoHS and regulatory approval status

The TY-400P qualifies as a substitute based on matching primary and secondary impedance values of 600 Ohms, data/voice coupling classification, through-hole mounting, equivalent isolation voltage specification, and overlapping frequency response characteristics within the critical audio band.

Parameter Comparison

Engineering Selection Recommendations

TTC-105 Selection Criteria: The TTC-105 remains the primary choice when Tamura-specific sourcing is required or when the exact 1:1 turns ratio specification is mandated by circuit design. This part carries CSA-C22.2 No. 66-M1988 and UL1459 approvals and maintains active production status with established inventory availability.

TY-400P Substitution Criteria: The TY-400P qualifies as a direct substitute when the following conditions are met:

• Circuit design accommodates a 1:1.07 turns ratio deviation from the nominal 1:1 specification
• Extended lower frequency response (300Hz versus 660Hz minimum) does not introduce unwanted signal coupling in the application
• Improved insertion loss performance (1.75dB typical versus 3dB maximum) is acceptable or beneficial
• ROHS3 compliance status meets regulatory requirements
• Physical footprint compatibility is verified for the 20.83 x 18.16mm dimensions
• Higher inventory availability (3425 pieces) supports supply chain requirements

Both parts maintain equivalent 600 Ohm impedance matching, 1500V isolation voltage, through-hole mounting configuration, and data/voice coupling classification. Selection between these parts depends on specific circuit tolerance requirements and sourcing constraints rather than fundamental electrical incompatibility.

Frequently Asked Questions (FAQ)

Q: Can the TY-400P replace the TTC-105 in any application?

A: The TY-400P is electrically compatible for applications where the 1:1.07 turns ratio deviation is acceptable. The primary impedance and secondary impedance both remain 600 Ohms, maintaining the critical impedance matching function. However, circuit-level validation is required to confirm that the turns ratio tolerance does not affect system performance.

Q: What is the significance of the frequency range difference between 660Hz and 300Hz?

A: The TY-400P extends the lower frequency response to 300Hz, while the TTC-105 specifies 660Hz as the minimum operating frequency. For applications operating strictly within the 660Hz to 3.5kHz band, both transformers perform equivalently. Applications requiring response below 660Hz must use the TY-400P.

Q: How do the insertion loss specifications compare?

A: The TTC-105 specifies maximum insertion loss of 3dB at 660Hz to 800Hz and 2.5dB maximum at 800Hz to 3.5kHz. The TY-400P provides 1.75dB typical insertion loss across its operating range. The TY-400P demonstrates superior insertion loss performance, which may reduce signal attenuation in coupling applications.

Q: Are the physical dimensions compatible for PCB layout?

A: The TTC-105 measures 21.30 x 16.00mm with a seated height of 19.00mm. The TY-400P measures 20.83 x 18.16mm with a seated height of 19.05mm. Both parts use through-hole PC pin termination. Verify PCB footprint spacing to confirm compatibility, as the width dimension differs by 2.16mm.

Q: What compliance certifications apply to each part?

A: The TTC-105 carries CSA-C22.2 No. 66-M1988 and UL1459 approvals and is RoHS Compliant. The TY-400P is ROHS3 Compliant and REACH Unaffected. Both parts meet environmental and safety standards for their respective categories. Verify that the specific certifications required by your application are present on the selected part.

Q: What is the difference between 1500VRMS @ 1 Minute and 1500VAC isolation specifications?

A: Both specifications indicate 1500V isolation capability. The TTC-105 specifies the test condition as 1500VRMS applied for 1 minute, while the TY-400P specifies 1500VAC. These represent equivalent isolation voltage ratings for data/voice coupling transformer applications.

Q: Can I use either part interchangeably without circuit modification?

A: Direct interchangeability depends on circuit tolerance to the 1:1.07 turns ratio of the TY-400P and the extended frequency response characteristics. Perform circuit analysis to confirm that impedance matching, frequency response, and insertion loss variations do not degrade system performance before implementing substitution.