78279221281

Overview

The Würth Elektronik 78279221281 is a multilayer ferrite bead from the WE-MPSA series, designed for EMI power suppression in surface-mount applications. It features a 1206 (3216 metric) package with dimensions of 3.20mm x 1.60mm and a maximum height of 1.30mm. The component provides an impedance of 280 Ohms at 100 MHz with a tolerance of ±25%. It supports a maximum DC current of 3.5 A and has a maximum DC resistance of 35 mOhms. Operating within a temperature range of -55°C to +125°C, it meets AEC-Q200 automotive standards.

Feature Summary

• Multilayer construction for effective EMI noise suppression in power lines
• Automotive-grade reliability certified under AEC-Q200 standards
• Shielded design minimizes external magnetic field interference
• Compact 1206 footprint suitable for space-constrained PCB layouts

Applications

• Power supply input filtering in automotive electronic modules
• EMI suppression on data lines for high-speed interfaces
• Noise reduction in DC/DC converter output stages
• Signal integrity enhancement in mobile device power circuits

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to ensure correct impedance and tolerance specifications. Confirm that the requested variant matches the required AEC-Q200 qualification if used in automotive contexts. Check for any recent product change notices (PCN) that may affect packaging or material composition prior to final procurement decisions.

Selection Notes

Select this component when designing circuits requiring robust EMI filtering for power lines with currents up to 3.5 A. The 280 Ohm impedance at 100 MHz makes it suitable for suppressing high-frequency noise common in switching power supplies. Ensure the PCB layout accommodates the 1206 package size and that the thermal environment remains within the specified -55°C to +125°C operating range for reliable performance.

Part Context

This part belongs to the WE-MPSA series, which specializes in multilayer power suppression beads. These components are engineered to replace traditional wire-wound ferrites in SMD applications, offering better self-resonance characteristics and lower DC resistance. The series is widely used in automotive and industrial electronics where compact size and high current handling are critical requirements.

Replacement Considerations

Cross-reference with other WE-MPSA variants for different impedance values if the 280 Ohm specification does not match the target frequency response. Verify pin compatibility and thermal characteristics when substituting with similar parts from other manufacturers to ensure equivalent performance in EMI suppression and current handling capabilities.