B82801B0305A125

Current Sense Transformers Overview

The B82801B0305A125 is a surface mount current sense transformer from the EPCOS B82801B series. It features an EE 5 core and a turns ratio of 1:125. The component operates within a frequency range of 50 kHz to 1 MHz. Primary DC resistance is 0.8 mΩ, while secondary DC resistance is 6.5 Ω. Minimum inductance is 80 μH, with a typical value of 3 mH. Maximum sensed current is 20 A. Dimensions are 7.11 mm length, 8.13 mm width, and 5.08 mm height.

Current Sense Transformers Feature Summary

• Surface mount construction suitable for lead-free reflow soldering
• Very low primary DC resistance for efficient signal sensing
• High isolation capability via transformer architecture

Current Sense Transformers Applications

• Current sensing in switch-mode power supplies
• Overcurrent protection circuits
• Feedback control loops in industrial electronics

Current Sense Transformers Procurement Notes

Verify the specific suffix 'A125' against manufacturer documentation to confirm the exact turns ratio and inductance tolerance. Ensure the ordering suffix matches the required electrical characteristics for the target application circuit. Confirm RoHS compliance status through official material data sheets prior to final procurement decisions.

Current Sense Transformers Selection Notes

Select this component when high-frequency current monitoring is required in compact designs. The surface mount package facilitates automated assembly processes. Evaluate the 1:125 turns ratio against the maximum expected primary current to ensure accurate secondary signal generation without saturation.

Current Sense Transformers Part Context

This part belongs to the B82801B series of SMT current sense transformers manufactured by EPCOS, now part of TDK Electronics. These components utilize an EE 5 core design optimized for space-constrained applications. The series provides reliable galvanic isolation between primary and secondary circuits for precise current measurement.

Current Sense Transformers Replacement Considerations

Consult official cross-reference lists for compatible alternatives. Verify that substitute parts match the 1:125 turns ratio, 50-1000 kHz frequency range, and physical dimensions (7.11 x 8.13 x 5.08 mm) to maintain board compatibility.