*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
Specifications are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device
performance may vary over time.
Users should verify actual device performance in their specific applications.
*RoHS COMPLIANT
SRF2012 Series - Common Mode Chip Inductors
Features
High impedance value
Current rating up to 450 mA
RoHS compliant*
Electrical Specifications
Product Dimensions
0.40
(.016)
TYP.
0.40
(.016)
TYP.
TYP.
0.45
(.018)
TYP.
0.45
(.018)
1.25 ± 0.2
(.049 ± .008)
1.25 ± 0.2
(.049 ± .008)
2.05 ± 0.2
(.081 ± .008)
1
4
2
3
General Specifications
Reflow soldering.....230 °C; 50 sec max.
Operating Temperature ..-55 °C to +125 °C
(Temperature rise included)
Storage Temperature..-55 °C to +125 °C
Resistance to Soldering Heat
............................260 °C, 10 sec. max.
Materials
Core...............................................Ferrite
Wire.............................Enameled copper
Terminal.....................................Ag/Ni/Sn
Packaging...................2000 pcs. per reel
Recommended Layout
REF.
0.90
(.035)
REF.
0.35
(.014)
REF.
0.35
(.014)
REF.
0.80
(.032)
REF.
0.50
(.020)
REF.
0.90
(.035)
DIMENSIONS:
MM
(INCHES)
Impedance
Rated Withstanding Insulation DCR IDC
@ 100 MHz
Voltage Voltage Resistance Max. Max.
Bourns Part No. (
Ω
) Tolerance (%) (DC) (DC) (M
Ω
) (Ω) (mA)
SRF2012-300Y 30 ±25 50 125 10 0.20 450
SRF2012-670Y 67 ±25 50 125 10 0.25 400
SRF2012-900Y 90 ±25 50 125 10 0.35 330
SRF2012-121Y 120 ±25 50 125 10 0.30 370
SRF2012-161Y 160 ±25 50 125 10 0.40 300
SRF2012-181Y 180 ±25 50 125 10 0.35 330
SRF2012-201Y 200 ±25 50 125 10 0.35 330
SRF2012-221Y 220 ±25 50 125 10 0.35 310
SRF2012-261Y 260 ±25 50 125 10 0.40 300
SRF2012-301Y 300 ±25 50 125 10 0.40 290
SRF2012-361Y 360 ±25 50 125 10 0.45 280
SRF2012-371Y 370 ±25 50 125 10 0.45 280
SRF2012-501Y 500 ±25 50 125 10 0.55 170
SRF2012-671Y 670 ±25 50 125 10 0.60 140
SRF2012-901Y 900 ±25 50 125 10 0.60 80
edoM lamroNedoM nommoC
Z
(f)
1 MHz 3 MHz 10 MHz 30 MHz 100 MHz 300 MHz 1 GHz 1 MHz 3 MHz 10 MHz 30 MHz 100 MHz 300 MHz 1 GHz
300 0.64 1.94 5.99 14.34 31.33 53.67 93.89 0.200 0.240 0.470 1.180 3.490 9.850 34.370
670 1.45 4.42 13.62 32.45 70.17 117.65 201.20 0.250 0.290 0.550 1.340 3.830 10.560 34.260
900 1.04 3.09 10.14 28.96 90.46 254.50 491.35 0.280 0.330 0.610 1.520 4.150 11.260 38.760
121 2.64 7.96 23.80 56.67 126.11 218.67 417.23 0.330 0.380 0.670 1.640 4.710 13.030 43.460
161 1.79 5.35 17.50 49.70 153.36 327.38 574.77 0.390 0.440 0.760 1.850 5.290 14.560 53.660
171 3.87 11.68 35.09 82.74 180.25 314.98 587.53 0.400 0.450 0.750 1.800 5.050 13.770 48.810
261 5.33 15.85 46.54 109.83 263.01 479.42 895.05 0.450 0.500 0.850 2.040 5.770 15.820 62.080
371 4.16 12.42 40.38 113.88 369.14 802.72 1135.60 0.510 0.560 0.890 2.070 5.760 15.600 72.730
*RoHS COMPLIANT
Impedance vs. Frequency
1000
k 5.3 B & T1HC Ω, 1 ΩZ
+
IP
100
10
1
0.1
Common Mode Normal Mode
000100101
261
371
121
670
300
900
181
161
371
261
181
161
121
900
670
300
This series is currently available but
not recommended for new designs.
Recommended alternatives are the Model
SRF2012A and SRF2012AA.
OBSOLETE
