Document 111
Tunable RF Inductors – 148 Series
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
number
1
148-01J12L
148-02J12L
148-03J12L
148-04J12L
148-05J12L
148-06J12L
148-07J12L
148-08J12L
148-09J12L
148-10J12L
148-11J12L
148-12J12L
148-13J12L
Color
Brown
Red
Orange
Yellow
Green
Blue
Violet
Gray
White
Black
Brown
Red
Orange
Turns
1
½
2
½
3
½
4
½
5
½
6
½
7
½
8
½
9
½
10
½
11
½
12
½
13
½
no core
35
44
56
74
92
114
142
168
198
237
276
315
344
Inductance (nH)
2
min
3
nom
38
46
60
77
96
120
154
176
208
250
290
338
362
39
52
73
101
130
170
222
262
310
375
435
500
540
0.275 max
6,99
max
3
40
58
86
125
164
220
290
346
410
500
580
666
710
Q min
4
at L nom
88 @ 50 MHz
96 @ 50 MHz
106 @ 50 MHz
112 @ 50 MHz
112 @ 50 MHz
112 @ 50 MHz
110 @ 50 MHz
106 @ 25 MHz
104 @ 25 MHz
90 @ 25 MHz
84 @ 25 MHz
66 @ 25 MHz
64 @ 25 MHz
No core SRF
min (MHz)
3200
1560
1200
980
820
720
620
570
490
450
410
350
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 C
p
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.
0.750 ±0.015
19,05 ±0,38
0.300 max
7,62
0.190
4,83
0.310 typ
7,87
0.360 ±0.010
9,14 ±0,25
1
0.250 ±0.030
6,35 ±0,76
22 AWG
0.198 ±0.010
5,03 ±0,25
Weight:
0.7 – 1.2 g
Terminations:
Tin-silver over copper
1
Specifications subject to change without notice.
Please check our website for latest information.
Document 111
Revised 04/27/05
© Coilcraft, Inc. 2010
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