Document 223-1
RFID Transponder Coils – 4308TC
NOTE: This product has been replaced by the 4308RV
series. The new series is footprint compatible and offers
better read distances and an expanded temperature
range.
Coilcraft’s family of antenna coils are rugged, high perfor-
mance devices intended for RFID applications at 125 kHz.
Theselowprofilepartshaveanextendedlengththatallows
longer read ranges and higher sensitivity. The coil is
constructedofferritelaminatedontoaceramicbase,which
makes it more rugged and impact resistant than all-ferrite
constructions. An encapsulated top ensures reliable pick
andplaceoperations.
In addition to the standard models shown, Coilcraft can
design transponder coils designed to operate at other
frequencies.
Inductance1
@125 kHz
5ꢀ ꢁmHꢂ
Read
Matching
capacitor4
ꢁpFꢂ
distance3
ꢁinches/cmꢂ
DCR max5
ꢁOhmsꢂ
SRF min6
ꢁkHzꢂ
Part Number1
Q min2
Color code
4308TC-404XJL_
4308TC-904XJL_
4308TC-115XJL_
4308TC-205XJL_
4308TC-245XJL_
0.40
0.90
1.08
1.97
2.38
15
15
15
17
17
20/52
26/67
27/70
31/80
32/83
4000
1800
1500
820
7.4
22
25
34
39
4500
4000
4000
2400
2200
YellowBlackYellow
WhiteBlackYellow
BrownBrownGreen
Red BlackGreen
680
RedYellowGreen
4308TC-335XJL_
4308TC-415XJL_
4308TC-495XJL_
4308TC-685XJL_
4308TC-715XJL_
3.30
4.15
4.90
6.80
7.10
17
17
17
17
17
35/90
35/90
36/91
37/95
38/97
490
390
330
240
220
51
74
96
112
115
1800
1700
1300
1000
1000
OrangeOrangeGreen
YellowBrownGreen
YellowWhiteGreen
BlueGrayGreen
VioletBrownGreen
4308TC-815XJL_
8.10
17
37/95
200
123
960
GrayBrownGreen
1. When ordering, please specify packaging code:
4308TC-815XJLD
Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic tape (3000 parts per full reel).
B = Less than full reel. In tape, but not machine ready.
To have a leader and trailer added ($25 charge), use code letter D instead.
2. Inductance and Q measured using Agilent/HP 4192A impedance analyzer. For recommended test procedures, contact Coilcraft.
3. Read distance measured using the KEELOQ® Transponder Evaluation Kit part number DM303005 from Microchip. Distance was recorded as the
voltage across the resonant circuit dropped below 10 mV.
4. Matching capacitor value required for parallel resonant circuit operating at 125 kHz.
5. DCR measured on micro-ohmmeter.
6. SRF measured using Agilent/HP 8753D network analyzer.
7. Operating temperature range −40°C to +85°C.
8. Electrical specifications at 25°C.
See Qualification Standards section for environmental and test data.
Specifications subject to change without notice.
Please check our website for latest information. Document 223-1 Revised 02/09/05
© Coilcraft, Inc. 2006