TTC-105-1 Equivalent & Substitute Parts Reference

Part Overview

The TTC-105-1 is a 600 Ohm 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 active in production with 1097 pieces in stock inventory and carries RoHS compliance certification.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and functional characteristics align with the original specification, enabling direct replacement in circuit applications without design modification.

Substiute Parts

TTC-105-1

TamuraIn Stock: 1166TTC-105-1 Datasheet

Current PartRFQ

TY-401P

Triad MagneticsIn Stock: 1106TY-401P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TTC-105-1 are identified based on strict alignment of the following critical parameters:

Primary Impedance Matching: The substitute must provide 600 Ohm primary impedance to interface correctly with the source circuit.

Secondary Impedance Matching: The substitute must provide 600CT Ohm secondary impedance to interface correctly with the load circuit.

Turns Ratio Compatibility: The substitute must maintain a turns ratio within acceptable tolerance of 1:1 to preserve voltage transformation characteristics.

Frequency Range Coverage: The substitute must support the full 660Hz to 3.5kHz operational bandwidth or extend beyond it without performance degradation within the specified band.

Mounting and Termination: The substitute must use through-hole mounting with PC pin termination to ensure direct PCB compatibility without layout modification.

Isolation Voltage: The substitute must meet or exceed 1500VRMS isolation to maintain safety and regulatory compliance.

Transformer Type: The substitute must be classified as a data/voice coupling transformer to ensure functional equivalence.

The TY-401P from Triad Magnetics satisfies these substitution criteria with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection - TTC-105-1 (Tamura): The TTC-105-1 remains the preferred choice when original part availability and established supply chain continuity are priorities. The part is active in production with substantial inventory (1097 pieces) and carries CSA-C22.2 No. 66-M1988 and UL1459 approvals.

Substitute Selection - TY-401P (Triad Magnetics): The TY-401P is a qualified substitute when TTC-105-1 availability is constrained or when extended frequency range coverage (300Hz lower limit versus 660Hz) provides system benefit. The TY-401P demonstrates superior insertion loss performance (1.75dB typical versus 3dB maximum) and improved frequency response flatness (±0.5dB versus -1dB to 0.7dB). Both parts maintain identical primary and secondary impedance matching, through-hole mounting compatibility, and isolation voltage compliance. The TY-401P is active in production with 1075 pieces in stock inventory and carries ROHS3 compliance with REACH unaffected status.

Substitution Validity: Direct substitution is valid based on:

• Matched 600 Ohm primary and 600CT Ohm secondary impedance
• Compatible 1:1 to 1:1.07 turns ratio within audio coupling tolerance
• Identical through-hole PC pin termination and mechanical footprint
• Equivalent isolation voltage and data/voice coupling classification
• Both parts active in production with current regulatory compliance

No circuit redesign or PCB layout modification is required for substitution.

Frequently Asked Questions (FAQ)

Q: Can the TY-401P directly replace the TTC-105-1 without PCB modification?

A: Yes. Both transformers use identical through-hole PC pin termination and have compatible mechanical dimensions (height difference of 0.05mm is negligible). No PCB layout changes are required.

Q: What is the significance of the 1:1.07 turns ratio in the TY-401P versus the 1:1 ratio in the TTC-105-1?

A: The 1.07 ratio represents a 7% secondary voltage increase relative to the primary. For audio and data coupling applications operating in the 660Hz to 3.5kHz band, this variance is within acceptable tolerance and does not require circuit compensation. The impedance matching remains valid for both 600 Ohm primary and 600CT Ohm secondary configurations.

Q: Why does the TY-401P have a lower frequency limit of 300Hz while the TTC-105-1 specifies 660Hz?

A: The TY-401P is designed with extended low-frequency response capability. When operating within the TTC-105-1 specified band (660Hz to 3.5kHz), the TY-401P performs within its linear response region. The lower 300Hz limit indicates the TY-401P can support broader applications if required, but substitution within the 660Hz to 3.5kHz band is fully compatible.

Q: How do the insertion loss specifications compare between these parts?

A: The TTC-105-1 specifies 3dB maximum insertion loss at 660Hz to 800Hz and 2.5dB maximum at 800Hz to 3.5kHz. The TY-401P specifies 1.75dB typical insertion loss across its operating range. The TY-401P provides superior signal transmission efficiency. Both specifications are acceptable for data and voice coupling applications.

Q: Are there any compliance or certification differences between the two parts?

A: The TTC-105-1 carries CSA-C22.2 No. 66-M1988 and UL1459 approvals. The TY-401P does not list specific approval agency certifications in the provided data but carries ROHS3 compliance and REACH unaffected status. Both parts meet 1500V isolation requirements. Verify specific approval requirements for your application's regulatory jurisdiction before final selection.

Q: What is the DC resistance significance for substitution?

A: DC resistance affects impedance matching accuracy and insertion loss. The TTC-105-1 primary DCR is 71 Ohm (TY-401P: 76.53 Ohm, 7.5% variance) and secondary DCR is 117 Ohm (TY-401P: 108 Ohm, 7.7% variance). These variances are within acceptable tolerance for audio coupling transformers and do not prevent substitution.

Q: Can I use the TY-401P if my circuit operates only at frequencies below 660Hz?

A: The TY-401P is specified for 300Hz to 3.5kHz operation and is suitable for frequencies below 660Hz. However, the TTC-105-1 is specified only for 660Hz and above. If your application requires operation below 660Hz, the TY-401P is the appropriate choice. If operation is strictly within 660Hz to 3.5kHz, both parts are equivalent.

Q: What inventory considerations should I evaluate?

A: The TTC-105-1 has 1097 pieces in stock inventory. The TY-401P has 1075 pieces in stock inventory. Both parts are in active production. For high-volume requirements, confirm current availability with your supplier, as inventory levels change continuously.