Summary
every figure cited to the datasheet below- 0402 chip ferrite bead, BLM15_SN series — 1.0 × 0.5 × 0.5 mm, 0.25 mm end electrodes, 0.001 g, no markingp.4
- Impedance 47 Ω ±25% typical at 100 MHz (measured 100 MHz ±1 MHz, Keysight 4291A with 16192A fixture)p.2, p.4
- Grouped “For high speed signal line” in the series rating tablep.2
- Rated current 200 mA, and unmarked by the *1 flag — so the 85 → 125 °C derating curve applied to power-line members does not applyp.2, p.3
- DC resistance 0.60 Ω max initial, 0.65 Ω max after testingp.2
- Operating and storage range −55 to +125 °Cp.3
- Equivalent circuit is L in series with R — the resistance element becomes dominant at high frequencies, so noise is dissipated rather than reflectedp.4
- 8 mm paper tape at 2 mm pitch, 10,000 pcs per reelp.6
BLM15BA470SN1D is a 0402 chip ferrite bead from Murata's BLM15 SN series, filed in the rating table under “for high speed signal line”.p.2 Its label value is 47 Ω ±25% at 100 MHzp.2 — an impedance at one spot frequency, not a resistance — and the equivalent circuit note explains the useful part: at high frequency the resistive element dominates, so RF noise is burned off as heat instead of being reflected back down the line.p.4
The DC-side numbers are the ones that bite. DC resistance is allowed up to 0.60 Ω initially (0.65 Ω after environmental testing)p.2 and the rated current is just 200 mAp.2 — fine in series with a signal or a lightly-loaded supply pin, wrong for a power rail. Within those limits it works from −55 to +125 °C with no derating note attached to its table row.p.3 It ships 10,000 to an 8 mm paper-tape reel.p.6
3D Assembly
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2D Layout
Datasheet
the source of every number on this page
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11md5 945ade57f71f3915a01f8d1fbab43eac