TTC-108 Equivalent & Substitute Parts Reference

Part Overview

The TTC-108 is a 600CT impedance audio transformer manufactured by Tamura, designed for data and voice coupling applications. This through-hole mounted component operates across the 300Hz to 3.5kHz frequency range with a 1:1 turns ratio and provides 1500VRMS isolation at 1 minute. The part is currently active in production with 1134 units in stock. Substitute parts are identified when equivalent electrical characteristics, mechanical compatibility, and regulatory compliance align with application requirements.

Substiute Parts

TTC-108

TamuraIn Stock: 1144TTC-108 Datasheet

Current PartRFQ

TY-145P

Triad MagneticsIn Stock: 20340TY-145P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TTC-108 is determined by the following critical parameters:

Primary Matching Criteria:

• Turns Ratio: 1:1 (exact match required)
• Impedance Primary: 600CT (exact match required)
• Impedance Secondary: 600CT (exact match required)
• Transformer Type: Data/Voice Coupling (functional category match required)
• Mounting Type: Through Hole (mechanical compatibility required)
• Termination Style: PC Pin (board interface compatibility required)

Secondary Compatibility Factors:

• DC Resistance tolerance within acceptable operating margins
• Frequency range coverage of the 300Hz to 3.5kHz band
• Voltage isolation rating of 1500V or greater
• Physical dimensions compatible with PCB layout constraints
• RoHS compliance status

The TY-145P from Triad Magnetics qualifies as a substitute based on matching all primary criteria. Both transformers share identical turns ratios, impedance values, coupling function, and through-hole PC pin termination. Dimensional variations remain within typical PCB design tolerances.

Parameter Comparison

Engineering Selection Recommendations

TTC-108 Selection Criteria:

• Applications requiring CSA-C22.2 No. 66-M1988 and UL1459 certification
• Designs with strict frequency response tolerance requirements (±0.5dB specification)
• PCB layouts with exact dimensional constraints matching 20.30mm x 17.50mm footprint
• Systems operating within the 300Hz to 3.5kHz band where extended frequency coverage is not required

TY-145P Selection Criteria:

• Applications where extended frequency range (200Hz to 15kHz) provides operational margin
• Designs compatible with ROHS3 compliance requirements
• PCB layouts tolerating dimensional variance of approximately 0.62mm length and 0.11mm width
• Systems where ±2dB frequency response tolerance is acceptable
• Applications where CSA-C22.2 and UL1459 certifications are not mandatory

Substitution Feasibility: The TY-145P functions as an electrical and mechanical substitute for the TTC-108 in data and voice coupling applications where certification requirements do not mandate CSA-C22.2 or UL1459 approval. Both transformers maintain identical impedance matching, turns ratio, and termination compatibility. The TY-145P's broader frequency response and extended operating temperature range (-20°C to 85°C) provide additional operational flexibility in applications not constrained by the TTC-108's specific certifications.

Frequently Asked Questions (FAQ)

Q: Can TY-145P replace TTC-108 in all applications?

A: The TY-145P provides electrical and mechanical compatibility for data and voice coupling functions. However, applications requiring CSA-C22.2 No. 66-M1988 or UL1459 certification must use the TTC-108. Verify certification requirements before substitution.

Q: What is the significance of the impedance matching between these transformers?

A: Both transformers maintain 600CT impedance on primary and secondary windings with 1:1 turns ratio. This ensures signal level preservation and impedance matching in coupled circuits. The 2Ω variance in secondary DC resistance (56Ω vs 58Ω) remains within acceptable operating margins for audio coupling applications.

Q: Are the physical dimensions interchangeable?

A: The transformers differ by approximately 0.62mm in length and 0.11mm in width. PCB layouts must accommodate these dimensional variations. Height difference of 0.012" is negligible for most through-hole applications. Verify PCB footprint constraints before substitution.

Q: What does the frequency range difference mean for circuit performance?

A: The TTC-108 operates 300Hz to 3.5kHz; the TY-145P operates 200Hz to 15kHz. The TY-145P extends coverage beyond TTC-108 specifications. For applications operating within the 300Hz to 3.5kHz band, both transformers perform equivalently. The TY-145P provides additional margin in extended frequency applications.

Q: How do the frequency response tolerances affect selection?

A: The TTC-108 specifies ±0.5dB response; the TY-145P specifies ±2dB. Applications requiring tighter frequency response control must use the TTC-108. The TY-145P's broader tolerance is acceptable for general data and voice coupling where ±2dB variation does not impact system performance.

Q: What is the impact of different approval agencies?

A: The TTC-108 carries CSA-C22.2 No. 66-M1988 and UL1459 certifications. The TY-145P certifications are not specified in available data. Applications subject to North American regulatory requirements must verify certification compliance before substitution.

Q: Are both transformers RoHS compliant?

A: Yes. The TTC-108 is RoHS Compliant; the TY-145P is ROHS3 Compliant. Both meet environmental compliance requirements. The TY-145P meets the current ROHS3 standard, which supersedes earlier RoHS specifications.

Q: What is the practical difference in insertion loss between these parts?

A: The TTC-108 specifies 1.4dB maximum insertion loss at 1kHz; the TY-145P specifies 1.5dB. The 0.1dB difference is negligible in most audio coupling applications and falls within typical measurement variance.

Q: Can I use TY-145P if my design specifies TTC-108?

A: Substitution is permissible only if the design does not mandate CSA-C22.2 or UL1459 certification and if PCB layout tolerates the dimensional variance. Consult design documentation and regulatory requirements before substitution.