The approximate impedance of any bead is the impedance of a size 101 bead multiplied by by the impedance factor.
e.g. If an FB-43-101 lists Z=40 ohms at 100MHz, then an FB-43-1801 will exhibit approx. (40 x 3.5) = 140 ohms at 100 MHz.
| Part Number | Impedance factor |
|---|---|
| FB-( )-101 | 1.0 |
| FB-( )-401 | 2.0 |
| FB-( )-801 | 2.5 |
| FB-( )-1801 | 3.5 |
| FB-( )-2401 | 1.0 |
| FB-( )-2501 | 2.5 |
| FB-( )-5111 | 6.5* |
| FB-( )-5621 | 6.5 |
| FB-( )-6301 | 2.0 |
* multi-hole bead, factor based on 2½ turns. All other sizes are for a single wire (1 turn)