SP-51

Overview

The SP-51 is an audio transformer manufactured by Triad Magnetics, designed for data and voice coupling applications. It features a primary impedance of 900 center-tapped ohms and a secondary impedance of 600 ohms, resulting in a turns ratio of 1.22:1. The device operates within a frequency range of 300Hz to 100kHz with a frequency response tolerance of ±2dB. Electrical specifications include a maximum DC current rating of 50mW, primary DC resistance of 80 ohms, and secondary DC resistance of 95 ohms. It provides 1000VRMS isolation voltage for 30 seconds and supports through-hole mounting.

Feature Summary

• Provides signal coupling for data and voice transmission systems
• Features a 900CT primary winding configuration with 600 ohm secondary output
• Ensures electrical safety via 1000VRMS isolation capability
• Supports standard through-hole PCB integration

Applications

• Data line coupling
• Voice communication circuits
• Telephony interface connections

Procurement Notes

Verify the specific manufacturer designation when sourcing this component, as Tamura Electronics also produces an equivalent part under the MET-29 designation. Confirm that the required impedance matches the 900CT primary and 600 ohm secondary configuration. Ensure the selected variant meets the necessary isolation voltage requirements for the intended circuit environment. Cross-reference datasheets to confirm physical dimensions and pinout compatibility before finalizing procurement.

Selection Notes

Select the SP-51 for applications requiring precise impedance matching between 900 ohm and 600 ohm lines. This component is suitable for environments operating within the 300Hz to 100kHz bandwidth. Consider the thermal performance limits ranging from -20°C to +85°C during installation planning. Evaluate the physical size constraints against the specified package dimensions to ensure adequate clearance on the printed circuit board.

Part Context

This component belongs to the audio transformer category produced by Triad Magnetics. It serves as a passive magnetic device for signal transmission. Similar products in the market include the MET-29 from Tamura, which shares identical electrical characteristics. The series focuses on reliable coupling for industrial and telecommunications infrastructure.

Replacement Considerations

The MET-29 manufactured by Tamura is a confirmed substitute part number with identical electrical specifications.