1 kOhm at 100 MHz — the suppression target
The BLM15AX102SN1D delivers 1 kOhms of impedance at 100 MHz, the standard reference frequency for EMI suppression in digital and RF lines. That impedance value tells you the attenuation at the noise frequency — a 1 kOhm bead in series with a 50-Ohm trace gives roughly 26 dB of insertion loss at 100 MHz, enough to knock down a clock harmonic or switching ripple before it radiates. Rated for 350 mA continuous current with a maximum DC resistance of 490 mOhm.
0402 footprint and wide temperature range
Housed in the standard 0402 (1005 Metric) package — 1.00 mm x 0.55 mm, 0.55 mm max height. This footprint fits high-density consumer, IoT, and portable designs where board real estate is at a premium. The single-line configuration means one bead per signal or power trace — no shared filtering between lines.
Active production — no lifecycle concern
Listed as Active in production status. This is a standard catalog part from Murata's EMIFIL® BLM15 series, widely stocked across distribution channels.