B78419A2251A003

Current Sense Transformers Overview

The B78419A2251A003 is a surface-mount invasive current sense transformer manufactured by EPCOS, part of the TDK Electronics portfolio. Designed for high-frequency applications, this component features an EP10 ferrite core and provides precise current measurement capabilities within a frequency range of 50kHz to 250kHz. It supports an operating temperature range from -40°C to +150°C, ensuring reliability in demanding environments. The device utilizes a gull-wing termination style and measures 12.80mm x 13.60mm with a maximum seated height of 14.40mm. With an inductance of 7mH, it is engineered for efficient signal integrity and compact integration in modern electronic systems.

Current Sense Transformers Feature Summary

• Invasive current sensing design utilizing an EP10 ferrite core for accurate measurement
• Optimized performance for high-frequency operation between 50kHz and 250kHz
• Robust thermal stability supporting extended operating temperatures from -40°C to +150°C
• Compact surface-mount footprint with gull-wing terminations for automated assembly

Current Sense Transformers Applications

• Automotive electronics current monitoring
• High-frequency power supply control circuits
• Industrial motor drive systems
• DC/DC converter feedback loops

Current Sense Transformers Procurement Notes

Verify that the specific application requires an invasive topology, as this transformer must be placed in series with the current path. Confirm that the operating frequency remains strictly within the 50kHz to 250kHz range to ensure accurate signal transfer. Ensure the PCB layout accommodates the 12.80mm x 13.60mm dimensions and allows for adequate clearance around the gull-wing leads. Check thermal management requirements against the -40°C to +150°C specification to prevent derating issues during peak load conditions.

Current Sense Transformers Selection Notes

Select this component when precise current feedback is required in high-frequency switching environments. The 7mH inductance value suits applications needing stable coupling without excessive saturation. Consider the invasive nature of the sensor, which impacts circuit topology compared to non-invasive alternatives. The wide temperature range makes it suitable for automotive and industrial sectors where environmental extremes are common. Evaluate space constraints against the 14.40mm maximum height to ensure compatibility with low-profile board designs.

Current Sense Transformers Part Context

This component belongs to the B78419 series of SMT current sense transformers developed by EPCOS for TDK. These devices are specifically engineered for automotive and industrial electronics, addressing the need for reliable current monitoring in compact spaces. The series leverages advanced ferrite materials to maintain performance across varying thermal conditions. As part of the broader TDK Electronics portfolio, these transformers support the company's focus on energy-efficient and robust electronic solutions for complex power management systems.

Current Sense Transformers Replacement Considerations

No public confirmed substitute part numbers are available.