MET-18

Audio Transformers Overview

The MET-18 is a through-hole audio transformer manufactured by Tamura, designed for data and voice coupling applications. It features a primary impedance of 10kΩ center-tapped and a secondary impedance of 4Ω. The device operates within a frequency range of 300Hz to 100kHz with a response tolerance of ±2dB. Electrical specifications include a primary DC resistance of 1.2kΩ and a secondary DC resistance of 1Ω. It supports a maximum current of 1.0mA DC and provides an isolation voltage of 500VRMS at 30 seconds. The component functions reliably across a temperature range of -20°C to 85°C.

Audio Transformers Feature Summary

• Designed for data and voice signal coupling in audio circuits
• Center-tapped primary winding configuration for balanced interfacing
• Robust electrical isolation capability for circuit protection
• Through-hole mounting style for standard PCB integration

Audio Transformers Applications

• Audio signal coupling
• Data transmission interfaces
• Voice communication circuits

Audio Transformers Procurement Notes

Verify the specific manufacturer designation as sources list both Talema and Tamura for this part number. Confirm the package type matches the required through-hole pin layout. Ensure the operating temperature range meets the environmental requirements of the target application. Cross-reference the impedance values to guarantee compatibility with the connected source and load impedances before finalizing procurement.

Audio Transformers Selection Notes

Select this component when a 10kΩ center-tapped primary is required to match a 4Ω secondary load. The wide frequency response makes it suitable for broadband audio and data signals. Consider the physical dimensions and through-hole termination when designing the PCB footprint. Verify that the 500V isolation rating satisfies the safety requirements of the system architecture.

Audio Transformers Part Context

The MET-18 belongs to the Tamura audio transformer series, which includes various models like the MET-59 for telecom applications. While sharing similar form factors, the MET-18 is distinctively optimized for high-impedance primary coupling rather than low-impedance telecom line matching. It serves as a specialized passive component for signal integrity in mixed-signal environments.

Audio Transformers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.