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“Unicoil” 10 mm
Tunable RF Inductors

  • Windings are precision molded into plastic for mechanical and electrical stability
  • Tuning is done by means of a threaded powdered iron core with a hex socket
  • Optional plated brass shield cans with solderable tabs provide integral shielding
  • Extremely economical, even in small quantities
  • Tune with our handy 3-in-1 "TriTuner" tuning wrench
  • Samples of all 7 mm and 10 mm values are available in Coilcraft Designer's Kit M302
  • RoHS-compliant. Terminations: Series 142 and 143 leads – Tin-silver over copper
    Series 144 leads – Matte tin over copper
    Shield can tabs – Tin-silver over nickel over brass

142, 143, 144 series Photo    Pricing    PDF data sheet

SPECIFICATIONS

Dimensions

Unshielded
Part number1
Click to get parts		 Color Turns No core
L nom2
(nH)		 L min3
(nH)		 L nom
(nH)		 L max
(nH)		 Q
min4		 No core
SRF min
(MHz)		 DCR
max5
(mOhm)		 Irms6
(A)
144-01J12L Brown 1 1/2 53.0 56.0 59.0 62.0 140 1800 7.4 11.0
144-02J12L Red 2 1/2 75.0 79.0 88.0 98.0 145 1150 8.6 10.0
144-03J12L Orange 3 1/2 99.0 104 123 142 147 900 9.7 9.6
144-04J12L Yellow 4 1/2 126 132 164 195 150 765 10.9 9.0
144-05J12L Green 5 1/2 154 162 207 252 154 670 12.1 8.6
144-06J12L Blue 6 1/2 182 193 250 306 154 610 13.6 8.1
144-07J12L Violet 7 1/2 214 240 298 356 158 525 14.7 7.8
144-08J12L Gray 8 1/2 245 283 344 405 160 465 15.9 7.5
144-09J12L White 9 1/2 274 328 387 446 162 420 17.1 7.2
144-10J12L Black 10 1/2 307 391 442 493 162 390 18.5 7.0
142-01J08L Brown 1 1/2 63.0 63.0 65.0 68.0 115 980 7.4 13.4
142-02J08L Red 2 1/2 92.0 93.0 100 107 118 600 8.4 12.5
142-03J08L Orange 3 1/2 127 133 145 157 120 470 9.6 11.8
142-04J08L Yellow 4 1/2 166 174 196 218 125 420 10.8 11.1
142-05J08L Green 5 1/2 212 226 256 287 122 370 11.9 10.5
142-06J08L Blue 6 1/2 258 275 315 355 112 340 13.2 10.0
142-07J08L Violet 7 1/2 307 330 378 427 112 310 14.5 9.6
142-08J08L Gray 8 1/2 357 396 450 504 106 290 15.7 9.2
142-09J08L White 9 1/2 412 473 520 567 110 270 16.9 8.9
142-10J08L Black 10 1/2 464 550 592 635 104 260 18.0 8.6
143-09J12L White 9 1/2 385 404 550 693 86 280 16.7 7.3
143-10J12L Black 10 1/2 438 460 624 788 90 270 17.9 7.1
143-11J12L Brown 11 1/2 490 515 708 900 78 260 19.2 6.8
143-12J12L Red 12 1/2 545 578 764 950 84 250 20.5 6.6
143-13J12L Orange 13 1/2 600 673 845 1020 84 245 21.7 6.4
143-14J12L Yellow 14 1/2 645 726 908 1090 82 240 22.8 6.3
143-15J12L Green 15 1/2 692 803 978 1150 90 230 23.9 6.1
143-16J12L Blue 16 1/2 765 891 1080 1270 74 225 25.2 6.0
143-17J12L Violet 17 1/2 830 1010 1180 1340 74 215 26.4 5.8
143-18J12L Gray 18 1/2 895 1100 1250 1400 92 195 27.6 5.7
143-19J12L White 19 1/2 910 1200 1320 1440 98 190 28.9 5.6
143-20J12L Black 20 1/2 960 1300 1400 1500 92 185 30.0 5.5
1 To order fixed inductance parts without cores, eliminate the “J08” or “J12”, e.g. 144-01.
2 Inductance and Q readings taken on Boonton 260-A Q meter with 16 AWG tinned copper 1/2" long soldered along leads and bent at 90° 1/4" down from stand offs.
All inductance values greater than 0.1 µH read at recommended Q meter frequency.
All inductance values below 0.1 µH calculated from readings taken at 50 MHz.
3 L min measured with core halfway out top of form.
4 Q min measured at L nom at 40 MHz.
5 DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
6 Irms: Current that causes a 40°C temperature rise from 25°C ambient. Details
7 Core material: Carbonyl J Core length: 142 Series - 1/4";  143, 144 Series - 3/8".
8 Taps available in 144 Series parts at 1/8, 3/8, 5/8 and 7/8 turns.
9 Ambient temperature range: −40°C to +85°C
10 Storage temperature range: Component: −40°C to +85°C
Packaging trays or tubes: −40°C to +80°C
11 Electrical specifications at 25°C.
Resistance to soldering heat: Wave solder only. Recommended maximum board surface temperature of 168°C (334°F) for no more than three seconds. Pre-heating is recommended to minimize time over the solder nozzle. Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

Shielded
Part number1
Click to get parts		 Color Turns No core
L nom2
(nH)		 L min3
(nH)		 L nom
(nH)		 L max
(nH)		 Q
min4		 No core
SRF min
(MHz)		 DCR
max5
(mOhm)		 Irms6
(A)
144-01J12SL Brown 1 1/2 50.0 52.0 53.0 54.0 97 2200 7.4 11.0
144-02J12SL Red 2 1/2 67.0 70.0 74.0 78.0 98 1200 8.6 10.0
144-03J12SL Orange 3 1/2 88.0 92.0 99.0 106 98 920 9.7 9.6
144-04J12SL Yellow 4 1/2 106 111 122 133 100 790 10.9 9.0
144-05J12SL Green 5 1/2 126 132 149 165 101 685 12.1 8.6
144-06J12SL Blue 6 1/2 147 154 175 196 106 625 13.6 8.1
144-07J12SL Violet 7 1/2 168 176 200 223 104 530 14.7 7.8
144-08J12SL Gray 8 1/2 190 202 226 250 108 480 15.9 7.5
144-09J12SL White 9 1/2 210 239 256 274 108 435 17.1 7.2
144-10J12SL Black 10 1/2 232 270 282 295 106 420 18.5 7.0
142-01J08SL Brown 1 1/2 58.0 58.0 59.5 61.0 82 1230 7.4 13.4
142-02J08SL Red 2 1/2 81.0 84.0 86.0 89.0 83 650 8.4 12.5
142-03J08SL Orange 3 1/2 110 115 120 121 85 550 9.6 11.8
142-04J08SL Yellow 4 1/2 140 147 156 160 88 460 10.8 11.1
142-05J08SL Green 5 1/2 174 182 197 205 94 410 11.9 10.5
142-06J08SL Blue 6 1/2 210 220 240 248 94 370 13.2 10.0
142-07J08SL Violet 7 1/2 247 259 280 290 90 330 14.5 9.6
142-08J08SL Gray 8 1/2 284 299 322 337 86 320 15.7 9.2
142-09J08SL White 9 1/2 319 338 363 377 88 310 16.9 8.9
142-10J08SL Black 10 1/2 357 382 410 422 82 290 18.0 8.6
143-09J12SL White 9 1/2 300 315 369 423 80 303 16.7 7.3
143-10J12SL Black 10 1/2 338 355 416 477 82 290 17.9 7.1
143-11J12SL Brown 11 1/2 377 396 468 540 78 270 19.2 6.8
143-12J12SL Red 12 1/2 412 433 509 585 80 265 20.5 6.6
143-13J12SL Orange 13 1/2 452 475 556 637 80 265 21.7 6.4
143-14J12SL Yellow 14 1/2 490 515 604 693 78 260 22.8 6.3
143-15J12SL Green 15 1/2 522 583 660 738 80 250 23.9 6.1
143-16J12SL Blue 16 1/2 575 638 720 801 76 245 25.2 6.0
143-17J12SL Violet 17 1/2 612 693 770 846 76 240 26.4 5.8
143-18J12SL Gray 18 1/2 650 754 814 874 82 215 27.6 5.7
143-19J12SL White 19 1/2 675 792 846 900 80 210 28.9 5.6
143-20J12SL Black 20 1/2 715 847 896 945 74 200 30.0 5.5
1 To order fixed inductance parts without cores, eliminate the “J08” or “J12”, e.g. 144-01S.
2 Inductance and Q readings taken on Boonton 260-A Q meter with 16 AWG tinned copper 1/2" long soldered along leads and bent at 90° 1/4" down from stand offs.
All inductance values greater than 0.1 µH read at recommended Q meter frequency.
All inductance values below 0.1 µH calculated from readings taken at 50 MHz.
3 L min measured with core halfway out top of form.
4 Q min measured at L nom at 40 MHz.
5 DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
6 Irms: Current that causes a 40°C temperature rise from 25°C ambient. Details
7 Core material: Carbonyl J Core length: 142 Series - 1/4";  143, 144 Series - 3/8".
8 Taps available in 144 Series parts at 1/8, 3/8, 5/8 and 7/8 turns.
9 Ambient temperature range: −40°C to +85°C
10 Storage temperature range: Component: −40°C to +85°C
Packaging trays or tubes: −40°C to +80°C
11 Electrical specifications at 25°C.
Resistance to soldering heat: Wave solder only. Recommended maximum board surface temperature of 168°C (334°F) for no more than three seconds. Pre-heating is recommended to minimize time over the solder nozzle. Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.
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Updated: April 16, 2018