Document 223-1
RFID Transponder Coils – 4308TC
Coilcraft’s new family of antenna coils are rugged, high
performance devices intended for RFID applications at
125 kHz.
These low profile parts have an extended length that
allows longer read ranges and higher sensitivity. The coil
is constructed of ferrite laminated onto a ceramic base,
which makes it more rugged and impact resistant than all-
ferrite constructions. An encapsulated top ensures reli-
able pick and place operations.
In addition to the standard models shown, Coilcraft can
design transponder coils designed to operate at other
frequencies.
Coilcraft
Designer’s Kit C145
contains four samples of
each value shown. To order, contact Coilcraft or visit
http://order.coilcraft.com.
Part Number
4308TC-404XJBD
4308TC-904XJBD
4308TC-115XJBD
4308TC-205XJBD
4308TC-245XJBD
4308TC-335XJBD
4308TC-415XJBD
4308TC-495XJBD
4308TC-685XJBD
4308TC-715XJBD
4308TC-815XJBD
1.
2.
3.
4.
5.
Inductance
@125 kHz
1
(mH) ±5%
0.40
0.90
1.08
1.97
2.38
3.30
4.15
4.90
6.80
7.10
8.10
Q min
1
15
15
15
17
17
17
17
17
17
17
17
Matching
capacitor
2
(pF)
4000
1800
1500
820
680
490
390
330
240
220
200
DCR max
3
(Ohms)
7.4
22
25
34
39
51
74
96
112
115
123
SRF min
4
(kHz)
4500
4000
4000
2400
2200
1800
1700
1300
1000
1000
960
Read
distance
5
(inches/cm)
51/104
56/142
53/135
60/152
45/114
75/191
76/193
67/170
75/191
76/193
76/193
Color code
Yellow Black Yellow
White Black Yellow
Brown Brown Green
Red Black Green
Red Yellow Green
Orange Orange Green
Yellow Brown Green
Yellow White Green
Blue Gray Green
Violet Brown Green
Gray Brown Green
Inductance and Q measured using Agilent/HP 4192A impedance analyzer. For recommended test procedures, contact Coilcraft.
Matching capacitor value required for parallel resonant circuit operating at 125 kHz.
DCR measured on micro-ohmmeter.
SRF measured using Agilent/HP 8753D network analyzer.
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.
6. Operating temperature range
−40°C
to +85°C.
7. Electrical specifications at 25°C.
See Qualification Standards section for environmental and test data.
Specifications subject to change without notice.
Document 223-1
Revised 12/18/02
Document 223-2
RFID Transponder Coils – 4308TC
Dimensions
Typical L vs Frequency
Parts/reel: 13″ 3000 Tape width: 24 mm
For packaging data see Tape and Reel Specifications section.
Specifications subject to change without notice.
Document 223-2 Revised 8/7/02
Analog electronics
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