TTC-13 Equivalent & Substitute Parts Reference

Part Overview

The TTC-13 is an audio transformer manufactured by Tamura, classified as a data/voice coupling transformer. It features a 4000 ohm primary impedance and 600 ohm secondary impedance with a turns ratio of 1:0.397. The device operates within the 300Hz to 3.5kHz frequency range and is designed for through-hole mounting applications. The TTC-13 maintains Active product status with 1019 units in current inventory. Substitute parts are identified when equivalent electrical and mechanical parameters are available from alternative manufacturers, enabling procurement flexibility and supply chain continuity.

Substiute Parts

TTC-13

TamuraIn Stock: 1053TTC-13 Datasheet

Current PartRFQ

TY-303P

Triad MagneticsIn Stock: 1524TY-303P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TTC-13 is determined by strict alignment of the following critical parameters:

Primary Electrical Criteria:

• Impedance - Primary: 4000 ohms (exact match required)
• Impedance - Secondary: 600 ohms (exact match required)
• Transformer Type: Data/Voice Coupling (functional classification match)
• Frequency Range: 300Hz ~ 3.5kHz (operational bandwidth match)
• Frequency Response: ±0.5dB (performance specification match)
• Voltage - Isolation: 1500V minimum (safety and regulatory requirement)
• Power Level: -45dB ~ 7dB (signal handling range match)

Mechanical Criteria:

• Mounting Type: Through Hole (PCB assembly compatibility)
• Termination Style: PC Pin (connection interface match)

Compliance Criteria:

• RoHS Status: Compliant or equivalent environmental standard

The TY-303P qualifies as a substitute based on matching primary impedance (4000 ohms), secondary impedance (600 ohms), transformer type (Data/Voice Coupling), frequency range (300Hz ~ 3.5kHz), frequency response (±0.5dB), isolation voltage (1500VAC), mounting type (Through Hole), and termination style (PC Pin). Variations in turns ratio, DC resistance, and insertion loss specifications do not disqualify substitution when primary electrical parameters align.

Parameter Comparison

Engineering Selection Recommendations

TTC-13 (Tamura) - Primary Selection

The TTC-13 is the specified component with Active product status and established supply availability (1019 units in stock). It carries CSA-C22.2 No. 66-M1988 and UL1459 approvals, meeting North American regulatory requirements for telecommunications applications. RoHS compliance is confirmed. This part should be used when original design specifications and certification requirements are non-negotiable.

TY-303P (Triad Magnetics) - Qualified Substitute

The TY-303P qualifies as a functional substitute when TTC-13 availability is constrained. Both parts share identical primary and secondary impedance values (4000 ohms and 600 ohms respectively), matching frequency range (300Hz ~ 3.5kHz), and equivalent frequency response (±0.5dB). Both support 1500V isolation and identical power level specifications (-45dB ~ 7dB). Through-hole mounting and PC pin termination are identical, ensuring mechanical compatibility in PCB assemblies.

The TY-303P demonstrates superior insertion loss performance (1dB typical versus 1.2dB maximum) and provides specified return loss (26dB typical). ROHS3 compliance exceeds RoHS requirements. Operating temperature range (-20°C ~ 85°C) is specified for the TY-303P, whereas the TTC-13 does not provide this parameter.

Physical dimensions differ marginally: TY-303P measures 0.812" x 0.715" versus TTC-13 at 0.799" x 0.650", with seated heights of 0.740" and 0.736" respectively. These dimensional variations remain within typical PCB layout tolerances for through-hole components.

DC resistance values show minor variation (TTC-13: 225 ohm primary / 45 ohm secondary; TY-303P: 260 ohm primary / 52 ohm secondary), representing approximately 15% increase. This variation does not disqualify substitution when impedance matching and frequency response specifications are met.

Substitution is appropriate for applications where North American telecommunications certifications (CSA-C22.2, UL1459) are not explicitly mandated and where ROHS3 compliance satisfies environmental requirements.

Frequently Asked Questions (FAQ)

Q: What are the critical parameters that determine if TY-303P can substitute for TTC-13?

A: The primary electrical parameters are impedance matching (4000 ohms primary, 600 ohms secondary), transformer type (Data/Voice Coupling), frequency range (300Hz ~ 3.5kHz), and frequency response (±0.5dB). Mechanical compatibility requires through-hole mounting and PC pin termination. Both parts meet these criteria, qualifying TY-303P as a substitute.

Q: Does the difference in turns ratio (1:0.397 versus 2.43:1) affect substitution eligibility?

A: Turns ratio is derived from impedance values. When primary and secondary impedances are identical, the transformer performs equivalent impedance transformation regardless of turns ratio calculation method. The impedance-based electrical performance remains equivalent for signal coupling applications.

Q: Are there dimensional concerns when substituting TY-303P for TTC-13?

A: Dimensional differences are minimal. TY-303P is 0.013" longer and 0.065" wider than TTC-13, with seated height difference of 0.004". These variations fall within standard PCB layout tolerances for through-hole components. Verify PCB footprint clearances in your specific assembly design.

Q: What compliance differences exist between TTC-13 and TY-303P?

A: TTC-13 carries CSA-C22.2 No. 66-M1988 and UL1459 certifications specific to North American telecommunications. TY-303P does not list these certifications but is ROHS3 compliant. If your application requires North American telecommunications certifications, TTC-13 is the required choice. For general industrial or consumer applications with RoHS requirements, TY-303P is acceptable.

Q: How do insertion loss specifications compare?

A: TTC-13 specifies 1.2dB maximum at 1kHz. TY-303P specifies 1dB typical. The TY-303P demonstrates superior insertion loss performance. Both values are acceptable for data/voice coupling applications within the 300Hz ~ 3.5kHz band.

Q: Is operating temperature range a substitution factor?

A: TTC-13 does not specify operating temperature range. TY-303P specifies -20°C ~ 85°C. If your application requires operation outside standard industrial temperature ranges, verify TTC-13 capabilities with the manufacturer. For standard -20°C to +85°C applications, both parts are suitable.

Q: Can I use TY-303P in a design originally specified for TTC-13?

A: Yes, when impedance matching, frequency response, isolation voltage, and mounting requirements are the primary design constraints. Verify that North American telecommunications certifications are not contractually or regulatory mandated. Confirm PCB layout accommodates the slightly larger physical dimensions. Perform electrical testing if DC resistance variation (approximately 15% higher in TY-303P) affects circuit performance in your specific application.