Magnetics for power and signal work: SMD and through-hole power inductors, radial drum-core inductors, axial RF chokes, chip inductors, SMD ferrite beads and wide-band ferrite chokes, plus the odd solenoid replacement coil.
To match an inductor, you need three numbers: inductance (often coded like a resistor, so 220 is 22 uH and 3R3 is 3.3 uH), the current rating (saturation or rated current), and the DC resistance. Then match the footprint. A ferrite bead is specified differently: by impedance in ohms at 100 MHz and by current, not by inductance.
Makers include Coilcraft, Bourns, J.W. Miller, Sumida, TDK, Toko, KOA Speer, Steward and Laird.
Related: Passive Components, Transformers and Capacitors.
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