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Document 324-1
RFID Transponder Coils – 4308RV
Coilcraft’s 4308RV antenna coils are high performance
devices intended for RFID applications at 125 kHz.
These low profile parts have an extended length that
allows longer read ranges. An encapsulated top en-
sures reliable pick and place operations. Core con-
struction and encapsulation are rated for 125°C, which
makes these transponders ideal for higher temperature
applications. For harsh environments, please consider
the 4312RV or 5315TC, which were developed for tire
pressure monitoring systems.
The 4308RV transponders coils are available in 5% and
2% tolerances. In addition to the standard models shown,
Coilcraft can design coils to operate at other frequencies.
Coilcraft Designer’s Kit C383 contains four samples
of all 5% inductance tolerance parts. To order, contact
Coilcraft or visit http://order.coilcraft.com.
Inductance
at 125 kHz2
Q
Part number1 (mH) Tolerance3 min2
4308RV-374X_L_
4308RV-404X_L_
4308RV-704X_L_
4308RV-904X_L_
4308RV-115X_L_
0.37
0.40
0.70
0.90
1.08
5,2 26
5,2 26
5,2 20
5,2 22
5,2 24
4308RV-205X_L_
4308RV-245X_L_
4308RV-295X_L_
4308RV-335X_L_
1.97
2.38
2.89
3.30
5,2 28
5,2 30
5,2 30
5,2 30
4308RV-415X_L_ 4.15
5,2 27
4308RV-495X_L_
4308RV-685X_L_
4308RV-715X_L_
4.90
6.80
7.10
5,2 26
5,2 28
5,2 27
4308RV-725X_L_ 7.20
4308RV-815X_L_ 8.10
5,2 28
5,2 28
4308RV-905X_L_ 9.00
5,2 30
Read
distance4
(in. / cm)
22 / 55.9
23 / 58.4
25 / 63.5
26 / 66.0
30 / 76.2
34 / 86.4
37 / 94.0
37 / 94.0
38 / 96.5
39 / 99.1
38 / 96.5
41 / 104.1
42 / 106.7
40 / 101.6
42 / 106.7
40 / 101.6
Matching DCR
Sensitivity5 capacitor6 max7
(mV/µT)
(pF) (Ohms)
9.82
10.38
13.96
4380
4050
2320
6.5
7.1
19
16.06
17.78
1800
1500
21
24
24.90
28.21
32.12
34.96
823 31
681 34
561 42
491 48
41.35
391 70
47.17
61.71
65.60
331 93
238 110
228 114
66.67
75.08
225 114
200 125
84.64
180 125
SRF
typ8
(kHz)
Color code
1800 Orange Violet Yellow
5000 Yellow Black Yellow
6600 Violet Black Yellow
4800 White Black Yellow
4300 Brown Brown Green
1750
1700
1900
1425
Red Black Green
Red Yellow Green
Red White Green
Orange Orange Green
1620 Yellow Brown Green
1150
1080
1050
Yellow White Green
Blue Gray Green
Violet Brown Green
965 Violet Red Green
965 Gray Brown Green
725 White Black Green
1. When ordering, please specify tolerance and packaging codes:
4308RV-905XJLD
Tolerance: G = 2% J = 5% (Table shows stock tolerances in bold.)
Packaging: D = 13machine-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.
3. Tolerances in bold are stocked for immediate shipment.
4. 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.
5. Sensitivity measured in accordance with Coilcraft application note
“Measuring Sensitivity of Transponder Coils.”
6. Matching capacitor value required for parallel resonant circuit operating
at 125 kHz.
7. DCR measured on micro-ohmmeter.
8. SRF measured using Agilent/HP 8753D network analyzer.
9. Ambient temperature range: –40°C to +125°C
10. Storage temperature range: Component: –40°C to +125°C
Packaging: –55°C to +80°C
11. Resistance to soldering heat: Three reflows at >217°C for 90 seconds
(+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room
temperature between.
12. Electrical specifications at 25°C.
13. Temperature coefficient of inductance: +200 to +700 ppm/°C
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Specifications subject to change without notice.
Please check our website for latest information.
Document 324-1 Revised 09/16/08
© Coilcraft, Inc. 2008
Free Datasheet http://www.datasheet-pdf.com/

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Document 324-2
RFID Transponder Coils – 4308RV
Typical Q vs Frequency
Typical L vs Frequency
60 12
-815
50
-404
10
40 8
-205
-415
30
-815
6
-415
20 4
-205
10 2
0 0 -404
1
10
100
1000
10000
1
10 100 1000
Frequency (kHz)
Frequency (kHz)
10000
0.108
2,74
max
0.079 ±0.004
2,00 ±0,10
0.040
0,89
0.450
11,43
max
0.433 ±0.005
10,99 ±0,127
0.040
1,01
ref
0.020
0,51
ref
0.124
3,15
max
0.070
1,78
Recommended
Land Pattern
0.333
8,46
0.473
12,01
0.110
2,79
Terminations: Silver-palladium-platinum-glass frit
Weight:
230 – 250 mg
Tape and reel: 3000/13reel 24 mm tape width
For packaging data see Tape and Reel Specifications section.
© Coilcraft, Inc. 2008
Specifications subject to change without notice.
Please check our website for latest information.
Document 324-2 Revised 09/16/08
Free Datasheet http://www.datasheet-pdf.com/