BLM21PG221SH1D

Chip Ferrite Bead Overview

The Murata BLM21PG221SH1D is a single-line chip ferrite bead in the EMIFIL BLM21 series, housed in an 0805 (2012 metric) surface-mount package. It provides 220 Ohms impedance at 100 MHz with a maximum DC resistance of 45 milliohms and a rated current of 2 Amperes. The component operates within a temperature range of -55°C to +125°C and holds AEC-Q200 automotive qualification.

Chip Ferrite Bead Feature Summary

• Functions as a resistor at noise frequencies to minimize resonance and preserve signal waveform integrity
• Nickel barrier external electrodes ensure high resistance to soldering heat
• Low DC resistance design supports high-current power line applications

Chip Ferrite Bead Applications

• Power supply EMI suppression filters
• Automotive electronic circuits requiring AEC-Q200 compliance
• On-board DC noise filtering without ground connections

Chip Ferrite Bead Procurement Notes

Verify the suffix SH1D against SN1D or SGPT variants to confirm specific packaging and tolerance requirements. Confirm AEC-Q200 status for automotive designs. Check RoHS3 and REACH compliance documentation. Validate impedance and current ratings against circuit specifications before ordering.

Chip Ferrite Bead Selection Notes

Select this component for 0805 footprints requiring 2A current handling and 220 Ohm noise suppression. Compare DCR values against other series members like BLM21BB if lower current is acceptable. Ensure thermal management aligns with the 125°C maximum operating limit.

Chip Ferrite Bead Part Context

Part of the Murata BLM21PG series designed for high-current power lines. It offers low DC resistance to match power lines up to 6A generally, though this specific variant is rated for 2A. The series eliminates the need for ground connections in noise filtering applications.

Chip Ferrite Bead Replacement Considerations

BLM21PG221SN1D is documented as a similar substitute part number from Murata Electronics.

Chip Ferrite Bead FAQ

Does the BLM21PG221SH1D require a ground connection?

No, the BLM series is effective in circuits without stable ground lines because it does not require a connection to ground.

What is the primary function of this ferrite bead?

It functions nearly as a resistor at noise frequencies, which greatly reduces the possibility of resonance and leaves signal waveforms undistorted.