B82801A1404A070

Current Sense Transformers Overview

The B82801A1404A070 is a surface-mount current sense transformer from the TDK EPCOS B82801A1 series, designed for board installation. It features an EE4.2 core and provides a turns ratio of 1:70. Key electrical parameters include a minimum inductance of 400 µH measured at 100 kHz with 100 mV excitation at +25 °C. The secondary coil resistance is specified at 4.6 Ohms maximum. The component operates within a frequency range of 50 kHz to 1 MHz and supports a maximum sensed input current of 7 A.

Current Sense Transformers Feature Summary

• Surface-mount construction utilizing an EE4.2 core geometry for compact integration.
• High isolation capability suitable for isolated power supply applications.
• Optimized for high-frequency operation between 50 kHz and 1 MHz.

Current Sense Transformers Applications

• Current sensing in isolated flyback converters
• Primary-side regulation circuits
• Power factor correction (PFC) units

Current Sense Transformers Procurement Notes

Verify the specific ordering suffix against official TDK documentation to confirm pinout configuration and tolerance class. Ensure the selected variant matches the required inductance and resistance specifications for the target circuit design. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and traceability before finalizing procurement orders.

Current Sense Transformers Selection Notes

Select this component based on the required turns ratio of 1:70 and the maximum sensed current of 7 A. Evaluate the PCB layout constraints to accommodate the SMD package dimensions of 4.85 mm by 4.5 mm. Confirm that the operating temperature range of -40 °C to +125 °C aligns with the thermal environment of the application system.

Current Sense Transformers Part Context

This component belongs to the B82801A1 series of SMT current sense transformers manufactured by TDK under the EPCOS brand. The series utilizes EE4.2 cores to provide reliable signal transmission for control loops in switching power supplies. These devices are engineered to replace traditional wire-wound transformers in space-constrained designs while maintaining accurate current feedback performance.

Current Sense Transformers FAQ

What is the maximum primary current rating for this transformer?

The maximum sensed input current is 7 A.

What is the inductance specification at the test frequency?

The minimum inductance is 400 µH, measured at 100 kHz with 100 mV excitation at +25 °C.