Document 112-3
“Slot Seven” 7 mm Tunable Inductors
Series 7M3 — Shielded with Ferrite Sleeve
Test
frequency
Q min
@ L nom
DCR max
(Ohms)
Part number
L min (µH)
L nom (µH)
L max (µH)
7M3-151
7M3-181
7M3-221
7M3-271
7M3-331
0.128
0.153
0.187
0.230
0.281
0.150
0.180
0.220
0.270
0.330
0.173
0.207
0.253
0.311
0.380
25 MHz
25 MHz
25 MHz
25 MHz
25 MHz
40
45
45
50
50
0.124
0.124
0.151
0.151
0.151
7M3-391
7M3-471
7M3-561
7M3-681
7M3-821
0.332
0.400
0.476
0.544
0.656
0.390
0.470
0.560
0.680
0.820
0.449
0.541
0.644
0.816
0.984
25 MHz
25 MHz
25 MHz
25 MHz
25 MHz
55
55
60
60
60
0.176
0.198
0.198
0.248
0.271
7M3-102
7M3-122
7M3-152
7M3-182
7M3-222
0.8
1.0
1.2
1.4
1.8
1.0
1.2
1.5
1.8
2.2
1.2
1.4
1.8
2.2
2.6
25 MHz
7.9 MHz
7.9 MHz
7.9 MHz
7.9 MHz
60
45
45
45
45
0.317
0.333
0.368
0.396
0.412
7M3-272
7M3-332
7M3-392
7M3-472
7M3-562
2.2
2.6
3.1
3.8
4.5
2.7
3.3
3.9
4.7
5.6
3.2
4.0
4.7
5.6
6.7
7.9 MHz
7.9 MHz
7.9 MHz
7.9 MHz
7.9 MHz
45
40
40
40
40
0.466
0.544
0.595
0.898
1.04
7M3-682
7M3-822
7M3-103
7M3-123
7M3-153
5.4
6.6
8
6.8
8.2
10
8.2
9.8
12
7.9 MHz
7.9 MHz
7.9 MHz
2.5 MHz
2.5 MHz
35
35
35
35
35
1.04
1.12
1.38
1.49
1.65
9
12
15
11
15
19
7M3-183
7M3-223
7M3-273
7M3-333
7M3-393
14
17
20
25
29
18
22
27
33
39
23
28
34
41
49
2.5 MHz
2.5 MHz
2.5 MHz
2.5 MHz
2.5 MHz
35
35
40
40
40
2.42
2.75
3.71
3.71
4.01
7M3-473
7M3-563
7M3-683
7M3-823
7M3-104
35
42
51
62
75
47
56
59
70
2.5 MHz
2.5 MHz
2.5 MHz
2.5 MHz
2.5 MHz
40
40
40
40
40
7.37
8.48
13.34
14.72
16.42
68
85
82
100
103
125
7M3-124
7M3-154
7M3-184
7M3-224
90
113
135
165
120
150
180
220
150
188
225
275
2.5 MHz
2.5 MHz
2.5 MHz
2.5 MHz
40
40
40
40
17.76
19.76
22.01
24.25
Parts in bold are included in Coilcraft Designer’s Kit M106.
Typical Q at L nom — Series 7M3
Notes:
1. All readings taken on Agilent/HP
4342-A Q Meter.
75
2. L min is achieved at maximum
extension of the core toward PC
board. Complete tuning range is
reached within the boundaries of the
coil form.
3. All specifications are at standard “Q”
meter frequencies. L and Q readings
change with frequency.
-102
-182
-332
50
-331
-151
-562
4. Shielded parts have a sleeve insert
to protect the winding.
5. Operating temperature range -40°C
to +85°C.
-393
-683
25
6. Electrical specifications at 25°C.
0
1
10
100
Frequency (MHz)
Specifications subject to change without notice.
Please check our website for latest information.
Document112-3 Revised11/21/02
© Coilcraft, Inc. 2007