78253/55MVC-R

Overview

The Murata Power Solutions 78253/55MVC-R is a specialized surface-mount power transformer designed for MAX253 DC-DC converter applications. It features a single primary and single secondary winding configuration with a turns ratio of 1:1.33. The component operates at a rated power of 1W, delivering a secondary current of 200mA at 5V from a 3.3V primary input. Key electrical parameters include an inductance of 240µH and a DC resistance of 0.4Ω. The unit provides 4000V isolation and is housed in an SMD package measuring 12.7mm in depth.

Feature Summary

• Optimized magnetic coupling specifically engineered for MAX253 compatible DC-DC converter topologies
• Provides robust 4000V isolation barrier between primary and secondary circuits for safety compliance
• Compact surface-mount form factor facilitates automated assembly and space-constrained PCB layouts

Applications

• MAX253-based isolated DC-DC converter modules
• General purpose isolated power supply designs
• Industrial control system power interfaces

Procurement Notes

Verify the specific suffix 'R' indicates tape-and-reel packaging when ordering. Confirm that the 78253/55MVC variant is suitable for your thermal requirements, as the reel version may have identical electrical characteristics but different handling procedures. Ensure the MAX253 controller matches the 1:1.33 turns ratio specification to maintain correct output voltage regulation under load conditions.

Selection Notes

Select this component only if the design requires a 1:1.33 turns ratio for the MAX253 architecture. Compare against the 78253/55MC-R (830µH) or 78253/55JC-R variants if higher inductance or different isolation ratings are needed. Verify that the 200mA secondary current rating meets the maximum load demand of the target application circuit without exceeding thermal limits.

Part Context

This part belongs to the 78253 series of specialty transformers manufactured by Murata Power Solutions. These components are distinct from general-purpose audio or signal transformers, as they are tightly coupled to specific switching regulator ICs like the MAX253. The series offers various inductance values and winding configurations to support different voltage conversion ratios within the same physical footprint family.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult Murata Power Solutions directly for recommended alternates or verify compatibility with legacy MAX253 reference designs before substituting.