© Coilcraft, Inc. 2010
Specifications subject to change without notice.
Please check our website for latest information.
Tunable RF Inductors – 148 Series
Document 111
Document 111 Revised 04/27/05
With an overall height of only 0.300″, these tunable
coils are ideal for applications where low-profile circuit
boards are essential.
The windings are precision molded in plastic to guaran-
tee a constant winding pitch and a consistent relation-
ship to the printed circuit board. Tuning is done by
means of a threaded Carbonyl J core.
Coilcraft Designer’s Kit M304 contains three samples
each of the values shown plus 20 values from the
132 Series of low-profile, high Q fixed inductors. To order,
contact Coilcraft or visit http://order.coilcraft.com.
Part Inductance (nH)2Q min4No core SRF
number1Color Turns no core min3nom max3at L nom min (MHz)
148-01J12L Brown 1½35 38 39 40 88 @ 50 MHz 3200
148-02J12L Red 2½44 46 52 58 96 @ 50 MHz 1560
148-03J12L Orange 3½56 60 73 86 106 @ 50 MHz 1200
148-04J12L Yellow 4½74 77 101 125 112 @ 50 MHz 980
148-05J12L Green 5½92 96 130 164 112 @ 50 MHz 820
148-06J12L Blue 6½114 120 170 220 112 @ 50 MHz 720
148-07J12L Violet 7½142 154 222 290 110 @ 50 MHz 620
148-08J12L Gray 8½168 176 262 346 106 @ 25 MHz 570
148-09J12L White 9½198 208 310 410 104 @ 25 MHz 490
148-10J12L Black 10½237 250 375 500 90 @ 25 MHz 450
148-11J12L Brown 11½276 290 435 580 84 @ 25 MHz 410
148-12J12L Red 12½315 338 500 666 66 @ 25 MHz 350
148-13J12L Orange 13½344 362 540 710 64 @ 25 MHz 320
1. To order fixed inductance parts without cores, eliminate the “J12”, e.g.
148-13L.
2. Inductance and Q readings taken on Agilent/HP 4342-A Q meter with 16
AWG tinned copper 1/2″ long soldered along leads and bent at 90° 1/4″
down from standoffs.
3. L min measured with core halfway out top of form. L max measured with
core centered in the windings.
4. Inductance values at 50 MHz calculated from Cp readings. Inductance
values at 25 MHz read at standard Q meter frequency (blue line).
5. Core material: Carbonyl J. Core length: 3/8″.
6. Operating temperature range -40°C to +85°C.
7. Electrical specifications at 25°C.
Weight: 0.7 – 1.2 g
Terminations: Tin-silver over copper
0.275
6,99 max
0.300
7,62 max
22 AWG
0.310
7,87 typ
0.190
4,83
0.750 ±0.015
19,05 ±0,38
0.250 ±0.030
6,35 ±0,76
0.360 ±0.010
9,14 ±0,25
0.198 ±0.010
5,03 ±0,25
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