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Designer's Kits

4308TC Series
RFID Transponder Coils

NOTE: This product has been replaced by the 4308RV series.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.Existing customers will continue to be supported.
  • For RFID applications at 125 kHz
  • Low profile and extended length allow longer read ranges and higher Q
  • Ceramic/ferrite laminate construction is more rugged than pure ferrite designs
  • Encapsulated top ensures reliable pick and place operations
  • RoHS-compliant. 260°C compatible. Silver-palladium-platinum-glass frit terminations.

SPECIFICATIONS


Part number1 Inductance2
at 125 kHz
±5% (mH)
Q
min2
Read
distance3
(inches/cm)
Matching
capacitor4
(pF)
DCR
max5
(Ohms)
SRF
min6
(kHz)
Color code
4308TC-404XJL_ 0.40 15 20 / 52 4000 7.4 4500 Yellow Black Yellow
4308TC-904XJL_ 0.90 15 26 / 67 1800 22 4000 White Black Yellow
4308TC-115XJL_ 1.08 15 27 / 70 1500 25 4000 Brown Brown Green
4308TC-205XJL_ 1.97 17 31 / 80 820 34 2400 Red Black Green
4308TC-245XJL_ 2.38 17 32 / 83 680 39 2200 Red Yellow Green
4308TC-335XJL_ 3.30 17 35 / 90 490 51 1800 Orange Orange Green
4308TC-415XJL_ 4.15 17 35 / 90 390 74 1700 Yellow Brown Green
4308TC-495XJL_ 4.90 17 36 / 91 330 96 1300 Yellow White Green
4308TC-685XJL_ 6.80 17 37 / 95 240 112 1000 Blue Gray Green
4308TC-715XJL_ 7.10 17 38 / 97 220 115 1000 Violet Brown Green
4308TC-815XJL_ 8.10 17 37 / 95 200 123 960 Gray Brown Green
1 When ordering, please specify packaging code: e.g. 4308TC-815XJLD
Packaging: D = 13" machine-ready reel
EIA-481 embossed plastic tape (3000 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 4152A impedance analyzer.
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 at 25°C on a micro-ohmmeter. For other operating temperatures, use this DCR at Temperature calculator.
6 SRF measured using Agilent/HP 8753D network analyzer.
7 Operating temperature range −40°C to +85°C.
8 Electrical specifications at 25°C.
9 Temperature coefficient of inductance: +200 to +700 ppm/°C.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

Your comments and suggestions are welcome. Contact [email protected]
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Updated: April 16, 2018