*R
o
*R HS
oH CO
S MP
CO L
M IAN
PL T
IA
NT
Features
High impedance value
Current rating up to 450 mA
RoHS compliant*
This series is currently available but
not recommended for new designs.
Recommended alternatives are the Model
SRF2012A
and
SRF2012AA.
SRF2012 Series - Common Mode Chip Inductors
Electrical Specifications
Impedance
Rated Withstanding Insulation
@ 100 MHz
Voltage
Voltage
Resistance
(Ω)
Tolerance (%)
(DC)
(DC)
(MΩ)
DCR
Max.
(Ω)
IDC
Max.
(mA)
Bourns Part No.
SRF2012-300Y
SRF2012-670Y
SRF2012-900Y
SRF2012-121Y
SRF2012-161Y
SRF2012-181Y
SRF2012-201Y
SRF2012-221Y
SRF2012-261Y
SRF2012-301Y
SRF2012-361Y
SRF2012-371Y
SRF2012-501Y
SRF2012-671Y
SRF2012-901Y
30
67
90
120
160
180
200
220
260
300
360
370
500
670
900
±25
±25
±25
±25
±25
±25
±25
±25
±25
±25
±25
±25
±25
±25
±25
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
125
125
125
125
125
125
125
125
125
125
125
125
125
125
125
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
0.20
0.25
0.35
0.30
0.40
0.35
0.35
0.35
0.40
0.40
0.45
0.45
0.55
0.60
0.60
450
400
330
370
300
330
330
310
300
290
280
280
170
140
80
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
Product Dimensions
2.05 ± 0.2
(.081 ± .008)
1.25 ± 0.2
(.049 ± .008)
Impedance vs. Frequency
Common Mode
CH1
Z
T & B 3.5 k
Ω,
1
Ω
371
Normal Mode
1
2
1000
+
IP
100
181
261
10
300
900
371
121
161
181
0.40
TYP.
(.016)
121
670
4
0.45
(.018)
TYP.
0.45
(.018)
TYP.
3
0.40
(.016)
TYP.
261
161
1
300
670
900
1.25 ± 0.2
(.049 ± .008)
0.1
1
0
100
1000
Z
300
670
900
121
161
171
261
371
(f) 1 MHz 3 MHz 10 MHz 30 MHz 100 MHz 300 MHz 1 GHz
0.64
1.45
1.04
2.64
1.79
3.87
5.33
4.16
1.94
4.42
3.09
7.96
5.35
11.68
15.85
12.42
5.99
13.62
10.14
23.80
17.50
35.09
46.54
40.38
14.34
32.45
28.96
56.67
49.70
82.74
109.83
113.88
31.33
70.17
90.46
126.11
153.36
180.25
263.01
369.14
53.67
117.65
254.50
218.67
327.38
314.98
479.42
93.89
201.20
491.35
417.23
574.77
587.53
895.05
Common Mode
Normal Mode
1 MHz 3 MHz 10 MHz 30 MHz 100 MHz 300 MHz 1 GHz
0.200
0.250
0.280
0.330
0.390
0.400
0.450
0.240
0.290
0.330
0.380
0.440
0.450
0.500
0.560
0.470
0.550
0.610
0.670
0.760
0.750
0.850
0.890
1.180
1.340
1.520
1.640
1.850
1.800
2.040
2.070
3.490
3.830
4.150
4.710
5.290
5.050
5.770
5.760
9.850
34.370
10.560 34.260
11.260 38.760
13.030 43.460
14.560 53.660
13.770 48.810
15.820 62.080
15.600 72.730
Recommended Layout
0.35
(.014)
REF.
802.72 1135.60 0.510
*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.
0.90
(.035)
REF.
0.80
(.032)
REF.
0.90
(.035)
REF.
0.50
(.020)
REF.
0.35
(.014)
REF.
DIMENSIONS:
MM
(INCHES)
Applications
Noise suppression
Personal computers
Display panels
SRF2012 Series - Common Mode Chip Inductors
Soldering Profile
275
<1> Maximum of 10 seconds between
+255°C and +260°C
225
220°C
190°C
60 - 90
seconds
Ramp Down
6°C/second
maximum
260°C peak
<1> 255°C
Electrical Schematic
N1
1
4
N2
2
3
Temperature (°C)
175
150°C
125
120 - 150 seconds
10 seconds minimum
75
Ramp Up
3°C/second maximum
25
0
50
100
150
200
250
Rev. 02/22/05
30 0
Time (seconds)
Packaging Specifications
178
(7.00)
DIA.
2.0
±
0.5
(.079
±
.020)
16.5
(.650)
21.0
±
0.8
(.827
±
.031)
13.0
(.512)
DIA.
50.0 - 0
(1.969 - 0)
13.0
DIA.
(.512)
14 + 0
(.551 + 0)
4.0
(.157)
4.0
(.157)
END
START
DIMENSIONS:
MM
(INCHES)
NO COMPONENT
200
(7.87)
NO COMPONENT
COMPONENTS
400
(15.75)
USER DIRECTION OF FEED
QTY: 2000 PCS. PER REEL
REV. 03/16
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.
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