78250C

Overview

The Murata Power Solutions Inc. 78250C is a board-mount power transformer designed for RS-232 interface isolation in conjunction with Maxim MAX250/MAX251 chipsets. It features a through-hole DIP package with dimensions of 9.52 mm length, 9 mm width, and 6.35 mm height. The component provides 1.5 kVDC isolation voltage and an inductance of 2.5 mH. It operates within a temperature range of -40°C to +85°C and complies with RoHS3 standards.

Feature Summary

• Designed specifically for compatibility with Maxim MAX250/MAX251 chipsets
• Provides electrical isolation for RS-232 communication interfaces
• Utilizes controlled turns ratio to ensure consistent performance

Applications

• RS-232 interface isolation circuits
• Datacom equipment requiring galvanic isolation
• Systems utilizing Maxim MAX250 or MAX251 transceiver chips

Procurement Notes

Verify the specific isolation rating against project requirements, as datasheets indicate variations between 1.5 kVDC and 4 kVrms across the series. Confirm that the through-hole DIP footprint matches the PCB layout constraints. Ensure the selected variant aligns with the target Maxim chipset generation to guarantee functional compatibility.

Selection Notes

Select this component when designing serial communication links that require robust isolation from Maxim MAX250/MAX251 drivers. The 2.5 mH inductance supports standard data rates for these applications. Consider the physical size and mounting style if space is constrained, as surface mount alternatives like the 78250MC-R exist but may have different availability status.

Part Context

This part belongs to the 78250 series of specialty transformers manufactured by Murata Power Solutions. These components are engineered to replace discrete isolation solutions, offering a compact, pre-wound magnetic assembly. The series is tailored for legacy and industrial serial communication standards, ensuring signal integrity while maintaining safety barriers.

Replacement Considerations

The 78250VC is a direct through-hole alternative within the same series. For surface mount applications, the 78250MC-R serves as a compatible SMD option, though it may be marked as obsolete or have limited stock.