78250JC-R

Overview

The Murata Power Solutions 78250JC-R is a surface-mount power transformer designed for the MAX250/MAX251 chipset. It features an inductance of 2 mH, a turns ratio of 1:1, and a secondary current rating of 300 mA. The component provides 4 kVrms isolation voltage and utilizes a toroidal structure to minimize electromagnetic interference. Physical dimensions are 12.7 mm in length, 9 mm in width, and 6.35 mm in height. It supports J-STD-020D reflow soldering processes.

Feature Summary

• Designed specifically for isolating RS232 interfaces when used with Maxim MAX250/MAX251 chipsets
• Toroidal core construction minimizes electromagnetic interference emissions
• Provides high isolation voltage capability for signal integrity protection
• Strictly controlled turns ratio ensures consistent performance across units

Applications

• Isolating RS232 serial communication interfaces
• Signal coupling in MAX250/MAX251 based converter circuits
• Board-level power and signal transformation in industrial equipment

Procurement Notes

Verify that the specific suffix '-R' matches the required tape-and-reel packaging configuration rather than tube packaging. Confirm the device is suitable for J-STD-020D reflow profiles. Ensure the design accounts for the 4 kVrms isolation requirements and the physical footprint constraints of the SMD package.

Selection Notes

Select this component only if the application requires compatibility with Maxim MAX250 or MAX251 transceivers. Consider the 2 mH inductance value for impedance matching. Evaluate the 300 mA secondary current limit against load requirements. The toroidal shape offers EMI benefits but may require specific placement considerations on the PCB layout.

Part Context

This part belongs to the 78250J series of specialty transformers manufactured by Murata Power Solutions. These components are engineered as direct replacements or compatible solutions for legacy Maxim Semiconductor designs. The series focuses on providing reliable galvanic isolation for serial data lines in noisy environments.

Replacement Considerations

The 78250JC is a direct equivalent without the reel suffix. For obsolete variants like the 78250MC-R, the 78250JC-R serves as a confirmed direct substitute within the same product family.