BLM18AG601SN1D

BLM18AG601SN1D is a ferrite bead from Murata in a 0603 (1608 metric) case with an impedance of 600 Ω ±25% at 100 MHz, and Murata's PIM record lists this part as In Production. Ratings: 500 mA, DC resistance 0.38 Ω maximum, dimensions 1.6 x 0.8 x 0.8 mm, operating range −55 °C to +125 °C. The final D is the paper-tape reel at 4,000 pieces. The selection point is the AG material at 600 Ω — high bead impedance for signal-line and low-current noise work in the default 0603 case. Selection advice: this site also lists the same-case BLM18PG121SN1D (120 Ω, PG material) and BLM18EG221SN1D (220 Ω, EG material); the material code in the string is a different ferrite with a different impedance curve, so the three are neighbours, not versions of one part.