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 ensuresreliable pick and place operations. Core construction andencapsulation are rated for 125°C, which makes thesetransponders 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 Coilcraftor visit http://order.coilcraft.com.		
Inductance			
Read		Matching DCR
SRF		 at 125 kHz2		
Q 	 distance4	 Sensitivity5 capacitor6	 max7	 typ8
Part number1(mH)	 Tolerance3	 min2 (in. / cm)(mV/µT)(pF)(Ohms) (kHz)Color code
4308RV-374X_L_
0.37
5,226
22 / 55.9
9.82
4380
6.5
1800 Orange Violet Yellow
4308RV-404X_L_
0.40
5,22623 / 58.4
10.384050
7.15000
Yellow Black Yellow
4308RV-704X_L_0.705,22025 / 63.5
13.96
2320
196600Violet Black Yellow
4308RV-904X_L_0.90
5,22226 / 66.0
16.06
1800
214800White Black Yellow
4308RV-115X_L_
1.08
5,22430 / 76.2
17.78
1500
244300 Brown Brown Green4308RV-205X_L_
1.97
5,22834 / 86.4
24.90
823
311750Red Black Green4308RV-245X_L_
2.385,23037 / 94.0
28.21681
341700Red Yellow Green4308RV-295X_L_
2.895,23037 / 94.0
32.12561
421900
Red White Green4308RV-335X_L_
3.30
5,230
38 / 96.5
34.96491481425 Orange Orange Green4308RV-415X_L_
4.15
5,22739 / 99.1
41.35
391
70
1620 Yellow Brown Green4308RV-495X_L_
4.90
5,226
38 / 96.5
47.17
331931150
Yellow White Green4308RV-685X_L_
6.80
5,228
41 / 104.1
61.71
238
110
1080
Blue Gray Green4308RV-715X_L_
7.10
5,227
42 / 106.7
65.60
228
114
1050
Violet Brown Green4308RV-725X_L_
7.20
5,228
40 / 101.6
66.67
225
114965Violet Red Green4308RV-815X_L_
8.10
5,22842 / 106.7
75.08
200125965
Gray Brown Green4308RV-905X_L_
9.00
5,23040 / 101.6
84.64
180125725
White Black Green
1. When ordering, please specify tolerance and packaging codes:
4308RV-905XJLD
G = 2% J = 5% (Table shows stock tolerances in bold.)D = 13″ machine-ready reel. EIA-481 embossed plastic
tape (3000 parts per full reel). Quantities less thanfull reel available: in tape (not machine ready) or withleader and trailer ($25 charge).
B = Less than full reel. In an effort to simplify our partnumbering system, Coilcraft is eliminating the needfor multiple packaging codes. When ordering, simply
change the last letter of your part number from B to D.
2. Inductance and Q measured using Agilent/HP 4192A impedance
analyzer.
Tolerance:
Packaging:

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. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.

US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg

Document 324-1

Revised 12/02/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.

Document 324-2

RFID Transponder Coils – 4308RV
Typical Q vs Frequency

Typical L vs Frequency

60

12-404Q factor

40-205-415

30-81520
100-815

10

Inductance (mH)508-415

64-2052110100

1000

10000

0-404
1

10Frequency (kHz)

0.020
ref
0,510.450max
11,430.433 ±0.005
10,99 ±0,127
0.124 max
3,150.079 ±0.004
2,00 ±0,10

1000

10000

Frequency (kHz)

0.040
ref
1,010.108 max
2,74100

Terminations RoHS compliant silver-palladium-platinum-glass frit
Weight 230 – 250 mg
Ambient temperature –40°C to +125°C
Storage temperature Component: –40°C to +125°C.
Tape and reel packaging: –40°C to +80°C
Resistance to soldering heat Max three 40 second reflows at+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /85% relative humidity)
Temperature coefficient of inductance +200 to +700 ppm/°CPackaging 3000 per 13″ reel Plastic tape: 24 mm wide,
0.3 mm thick, 8 mm pocket spacing, 2.7 mm pocket depth
PCB washing Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf.

0.040
0,890.070
1,78Recommended
Land Pattern

0.110
2,790.333
8,460.473
12,01

US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg

Document 324-2

Revised 12/02/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.