B78419A2271A003

Current Sense Transformers Overview

The B78419A2271A003 is a surface-mount current sense transformer from the TDK B78419 series, designed for high-frequency applications. It features a primary-to-secondary turns ratio of 1:180 and operates within a frequency range of 50kHz to 250kHz. The component has a maximum installation height of 0.567 inches (14.40mm) and dimensions of 0.504 inches in length by 0.535 inches in width (12.80mm x 13.60mm). It utilizes gull-wing termination styles for SMD mounting.

Current Sense Transformers Feature Summary

• High isolation voltage capability suitable for power supply feedback loops
• Optimized magnetic core design for low leakage inductance
• RoHS compliant construction with lead-free soldering compatibility

Current Sense Transformers Applications

• Primary-side regulation in flyback converters
• Current sensing in isolated DC-DC converter topologies
• Over-current protection circuits in power supplies

Current Sense Transformers Procurement Notes

Verify the specific suffix 'A003' against the manufacturer's latest datasheet to confirm pinout orientation and tape-and-reel specifications. Ensure that the ordering code matches the exact turns ratio required for the target circuit design, as minor suffix variations may indicate different packaging or mechanical tolerances.

Current Sense Transformers Selection Notes

Select this component when a 1:180 transformation ratio is necessary for accurate current monitoring in high-frequency switching environments. Consider the physical footprint constraints and the operating temperature range relative to the application's thermal profile. Validate that the core material supports the intended flux density without saturation at peak load conditions.

Current Sense Transformers Part Context

This part belongs to the B78419 series of SMT current sense transformers manufactured by TDK Electronics, formerly EPCOS. The series is engineered for compact power management solutions requiring galvanic isolation between primary and secondary sides. These components are widely used in modern switch-mode power supplies where space efficiency and electromagnetic interference reduction are critical design factors.

Current Sense Transformers Replacement Considerations

Consult official cross-reference lists for direct substitutes such as B78419A2289A003 or B78419A2290A003 if parameter alignment is required. Verify that any alternative maintains identical electrical characteristics and mechanical dimensions to ensure board compatibility.