Overview：

The BLM18AG121SN1# is a chip ferrite bead from Murata's BLM18AG series, supplied in a 1608 (0603 imperial) SMD package measuring 1.6 mm × 0.8 mm × 0.8 mm. The device provides a nominal impedance of 120Ω at 100 MHz, a maximum DC resistance of 0.18Ω, and a rated current of 800 mA, with an operating temperature range of −55°C to 125°C. It is designed to behave approximately as a resistor at noise frequencies, thereby suppressing high-frequency noise and reducing the risk of resonance, making it suitable for EMI suppression on general-purpose signal lines.

Features：

Behaves approximately as a resistive element at noise frequencies, effectively reducing the likelihood of resonance and preserving signal waveform integrity without distortion

Requires no ground connection, making it suitable for circuits with unstable ground lines

External electrodes use a nickel barrier layer structure, providing excellent solder heat resistanceThe BLM_A series develops impedance from relatively low frequencies, effectively suppressing noise over a broad frequency range from 30 MHz to several hundred MHz

Miniaturized 0603 package suitable for high-density mounting

Wide operating temperature range: −55°C to 125°C

Applications：

High-frequency noise suppression on general-purpose signal lines

Consumer electronic equipment (e.g., audio/video equipment, communication equipment, information equipment)

Industrial equipment (e.g., base stations, manufacturing equipment, measuring equipment)

Portable devices and power management circuits