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 kHz
2
1
Part number
(mH)
Tolerance
3
4308RV-374X_L_
0.37
5,2
4308RV-404X_L_
0.40
5,2
4308RV-704X_L_
0.70
5,2
4308RV-904X_L_
0.90
5,2
4308RV-115X_L_
1.08
5,2
4308RV-205X_L_
1.97
5,2
4308RV-245X_L_
2.38
5,2
4308RV-295X_L_
2.89
5,2
4308RV-335X_L_
3.30
5,2
4308RV-415X_L_
4.15
5,2
4308RV-495X_L_
4.90
5,2
4308RV-685X_L_
6.80
5,2
4308RV-715X_L_
7.10
5,2
4308RV-725X_L_
7.20
5,2
4308RV-815X_L_
8.10
5,2
4308RV-905X_L_
9.00
5,2
Q
min
2
26
26
20
22
24
28
30
30
30
27
26
28
27
28
28
30
Read
distance
4
(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
Sensitivity
5
capacitor
6
max
7
(mV/µT)
(pF)
(Ohms)
9.82
4380
6.5
10.38
4050
7.1
13.96
2320
19
16.06
1800
21
17.78
1500
24
24.90
823
31
28.21
681
34
32.12
561
42
34.96
491
48
41.35
391
70
47.17
331
93
61.71
238
110
65.60
228
114
66.67
225
114
75.08
200
125
84.64
180
125
SRF
typ
8
(kHz)
Color code
1800 Orange Violet Yellow
5000
Yellow Black Yellow
6600
Violet Black Yellow
4800
White Black Yellow
4300
Brown Brown Green
1750
Red Black Green
1700
Red Yellow Green
1900
Red White Green
1425 Orange Orange Green
1620 Yellow Brown Green
1150
Yellow White Green
1080
Blue Gray Green
1050
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
= 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.
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: –40°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 10/30/08
© Coilcraft, Inc. 2008
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