Surface Mount Toroids
Features
S
518 Series utilizes iron powder core — ideal for
frequency applications up to 100 kHz
S
618 Series utilizes Kool Mu
R
core — minimizes
core losses and heat generation at higher
frequencies of 100 to 250 kHz
S
Four low profile case sizes —.170 - .255 high
S
Tape and reel packaging
S
Standard or custom designs
Kool Mu
R
is a registered trademark of Magnetics Inc., Butler, PA.
PC MOUNTING
518 Series Toroids With Iron Powder Core and 01 Case Size
PARALLEL
OPEN
CIRCUIT
INDUCTANCE
$
20%
0.42
mH
0.56
mH
1.16
mH
2.61
mH
5.11
mH
8.45
mH
9.75
mH
15.80
mH
21.44
mH
26.72
mH
33.82
mH
52.07
mH
68.77
mH
100.32
mH
153.41
mH
205.19
mH
308.20
mH
MINIMUM
FULL LOAD
INDUCTANCE
0.35
mH
0.47
mH
0.73
mH
1.59
mH
3.36
mH
5.30
mH
6.22
mH
9.60
mH
14.10
mH
17.10
mH
22.30
mH
33.60
mH
43.60
mH
63.70
mH
96.70
mH
130.90
mH
190.10
mH
FULL
LOAD
CURRENT
Adc
5.50
5.10
4.50
3.40
2.00
1.80
1.70
1.40
1.00
0.96
0.83
0.70
0.66
0.54
0.44
0.36
0.32
MAXIMUM
DC
RESISTANCE
0.006
W
0.007
W
0.008
W
0.014
W
0.040
W
0.053
W
0.056
W
0.088
W
0.160
W
0.175
W
0.252
W
0.315
W
0.375
W
0.558
W
0.845
W
1.210
W
1.530
W
OPEN
CIRCUIT
INDUCTANCE
$
20%
1.68
mH
2.27
mH
4.46
mH
10.44
mH
20.46
mH
33.82
mH
39.00
mH
63.52
mH
83.57
mH
106.90
mH
135.30
mH
208.28
mH
275.10
mH
401.31
mH
613.64
mH
820.76
mH
1232.80
mH
SERIES
MINIMUM
FULL LOAD
INDUCTANCE
1.40
mH
1.80
mH
2.92
mH
5.30
mH
13.44
mH
21.20
mH
24.88
mH
38.40
mH
56.40
mH
68.40
mH
89.18
mH
134.40
mH
174.40
mH
254.75
mH
386.78
mH
523.60
mH
760.40
mH
FULL
LOAD
CURRENT
Adc
2.75
2.55
2.25
1.70
1.00
0.90
0.85
0.70
0.50
0.48
0.40
0.35
0.33
0.27
0.22
0.18
0.16
MAXIMUM
DC
RESISTANCE
0.024
W
0.026
W
0.032
W
0.055
W
0.160
W
0.210
W
0.224
W
0.350
W
0.640
W
0.700
W
1.008
W
1.280
W
1.500
W
2.232
W
3.380
W
4.840
W
6.120
W
MODEL
NUMBER
518-R47M-01
518-R68M-01
518-1R0M-01
518-2R0M-01
518-5R0M-01
518-8R0M-01
518-100M-01
518-150M-01
518-200M-01
518-250M-01
518-330M-01
518-500M-01
518-680M-01
518-101M-01
518-151M-01
518-201M-01
518-301M-01
CIRCUIT
DIAGRAM
MAGNETICS GROUP
S
57 Stanley Avenue
S
Watertown, MA 02172-4802
S
Tel: (617) 926-6400
S
Fax: (617) 926-6249
Division of Espion Electronicas, S.A./Subsidiary of C&K Components, Inc.
15
Surface Mount Toroids
PC MOUNTING
618 Series Toroids With Kool Mu
R
Core and 01 Case Size
PARALLEL
OPEN
CIRCUIT
INDUCTANCE
$20%
0.40 H
0.63 H
0.90 H
2.00 H
4.90 H
8.10 H
10.00 H
15.63 H
19.60 H
25.60 H
32.40 H
50.63 H
67.60 H
99.23 H
152.10 H
202.50 H
302.50 H
MINIMUM
FULL LOAD
INDUCTANCE
0.26 H
0.40 H
0.57 H
1.00 H
2.65 H
4.10 H
4.85 H
9.40 H
11.52 H
16.35 H
19.85 H
29.35 H
39.72 H
58.70 H
87.30 H
107.65 H
191.40 H
FULL
LOAD
CURRENT
Adc
5.50
4.50
4.20
4.10
2.30
2.00
1.90
1.10
1.00
0.74
0.72
0.64
0.54
0.44
0.38
0.37
0.22
MAXIMUM
DC
RESISTANCE
0.005
m
0.006
m
0.007
m
0.011
m
0.030
m
0.040
m
0.045
m
0.082
m
0.145
m
0.165
m
0.292
m
0.365
m
0.515
m
0.782
m
0.965
m
1.140
m
1.430
m
OPEN
CIRCUIT
INDUCTANCE
$20%
1.60 H
2.50 H
3.60 H
8.00 H
19.60 H
32.40 H
40.00 H
62.52 H
78.40 H
102.40 H
129.60 H
202.52 H
270.40 H
396.92 H
608.40 H
810.00 H
1210.00 H
SERIES
MINIMUM
FULL LOAD
INDUCTANCE
1.06 H
1.60 H
2.24 H
4.00 H
10.60 H
16.40 H
19.39 H
37.60 H
46.08 H
65.40 H
79.40 H
117.36 H
158.87 H
234.80 H
349.20 H
430.60 H
765.60 H
FULL
LOAD
CURRENT
Adc
2.75
2.25
2.10
2.05
1.15
1.00
0.95
0.55
0.50
0.37
0.36
0.32
0.27
0.22
0.19
0.19
0.11
MAXIMUM
DC
RESISTANCE
0.019
m
0.024
m
0.028
m
0.042
m
0.120
m
0.160
m
0.178
m
0.322
m
0.580
m
0.660
m
1.168
m
1.460
m
2.060
m
3.128
m
3.860
m
4.560
m
5.720
m
MODEL
NUMBER
618-R47M-01
618-R68M-01
618-1R0M-01
618-2R0M-01
618-5R0M-01
618-8R0M-01
618-100M-01
618-150M-01
618-200M-01
618-250M-01
618-330M-01
618-500M-01
618-680M-01
618-101M-01
618-151M-01
618-201M-01
618-301M-01
CIRCUIT
DIAGRAM
MAGNETICS GROUP
S
57 Stanley Avenue
S
Watertown, MA 02172-4802
S
Tel: (617) 926-6400
S
Fax: (617) 926-6249
Division of Espion Electronicas, S.A./Subsidiary of C&K Components, Inc.
16
Surface Mount Toroids
PC MOUNTING
518 Series Toroids With Iron Powder Core and 02 Case Size
PARALLEL
OPEN
CIRCUIT
INDUCTANCE
$20%
0.57
mH
0.83
mH
1.13
mH
2.30
mH
5.18
mH
8.30
mH
10.14
mH
15.50
mH
20.70
mH
25.05
mH
33.21
mH
50.81
mH
67.07
mH
100.18
mH
150.90
mH
203.20
mH
304.17
mH
MINIMUM
FULL LOAD
INDUCTANCE
0.43
mH
0.63
mH
0.85
mH
1.60
mH
3.75
mH
5.70
mH
6.90
mH
10.80
mH
13.45
mH
16.70
mH
21.50
mH
36.40
mH
46.70
mH
70.00
mH
101.80
mH
139.00
mH
199.70
mH
FULL
LOAD
CURRENT
Adc
5.90
5.40
5.00
3.90
2.50
2.30
2.10
1.60
1.50
1.40
1.30
0.82
0.76
0.62
0.56
0.46
0.42
MAXIMUM
DC
RESISTANCE
0.006
W
0.008
W
0.009
W
0.013
W
0.030
W
0.040
W
0.046
W
0.082
W
0.095
W
0.108
W
0.125
W
0.305
W
0.362
W
0.540
W
0.666
W
0.950
W
1.175
W
OPEN
CIRCUIT
INDUCTANCE
$20%
2.26
mH
3.34
mH
4.52
mH
9.18
mH
20.72
mH
33.20
mH
40.55
mH
62.00
mH
82.60
mH
100.20
mH
132.80
mH
203.25
mH
268.28
mH
400.72
mH
603.60
mH
812.80
mH
1216.65
mH
SERIES
MINIMUM
FULL LOAD
INDUCTANCE
1.70
mH
2.52
mH
3.40
mH
6.38
mH
14.80
mH
22.60
mH
27.50
mH
43.20
mH
53.60
mH
66.70
mH
85.80
mH
145.50
mH
186.70
mH
280.00
mH
407.00
mH
555.50
mH
798.50
mH
FULL
LOAD
CURRENT
Adc
2.95
2.70
2.50
1.95
1.25
1.15
1.05
0.80
0.75
0.70
0.65
0.41
0.38
0.31
0.28
0.23
0.21
MAXIMUM
DC
RESISTANCE
0.024
W
0.030
W
0.035
W
0.055
W
0.126
W
0.160
W
0.181
W
0.330
W
0.380
W
0.434
W
0.500
W
1.220
W
1.448
W
2.160
W
2.660
W
3.800
W
4.702
W
MODEL
NUMBER
518-R47M-02
518-R68M-02
518-1R0M-02
518-2R0M-02
518-5R0M-02
518-8R0M-02
518-100M-02
518-150M-02
518-200M-02
518-250M-02
518-330M-02
518-500M-02
518-680M-02
518-101M-02
518-151M-02
518-201M-02
518-301M-02
CIRCUIT
DIAGRAM
618 Series Toroids With Kool Mu
R
Core and 02 Case Size
PARALLEL
OPEN
CIRCUIT
INDUCTANCE
$20%
0.45
mH
0.80
mH
1.25
mH
2.45
mH
5.00
mH
8.45
mH
9.80
mH
14.45
mH
20.00
mH
24.20
mH
31.25
mH
51.20
mH
68.45
mH
101.25
mH
151.25
mH
198.45
mH
304.20
mH
MINIMUM
FULL LOAD
INDUCTANCE
0.30
mH
0.52
mH
0.80
mH
1.30
mH
2.80
mH
4.40
mH
4.90
mH
8.10
mH
11.94
mH
15.65
mH
14.84
mH
28.80
mH
39.00
mH
58.40
mH
95.90
mH
122.85
mH
170.90
mH
FULL
LOAD
CURRENT
Adc
6.50
5.50
4.60
4.50
3.00
2.60
2.50
1.70
1.30
1.00
1.40
0.92
0.78
0.63
0.43
0.39
0.38
MAXIMUM
DC
RESISTANCE
0.005
W
0.006
W
0.008
W
0.010
W
0.021
W
0.027
W
0.030
W
0.058
W
0.106
W
0.116
W
0.107
W
0.212
W
0.302
W
0.460
W
0.560
W
0.795
W
1.225
W
OPEN
CIRCUIT
INDUCTANCE
$20%
1.80
mH
3.20
mH
5.00
mH
9.80
mH
20.00
mH
33.80
mH
39.20
mH
57.80
mH
80.00
mH
96.80
mH
125.00
mH
204.80
mH
273.80
mH
405.00
mH
605.00
mH
793.80
mH
1216.80
mH
SERIES
MINIMUM
FULL LOAD
INDUCTANCE
1.18
mH
2.07
mH
3.10
mH
5.20
mH
11.20
mH
17.60
mH
19.60
mH
32.40
mH
47.80
mH
62.60
mH
59.36
mH
115.20
mH
156.00
mH
233.60
mH
383.60
mH
491.40
mH
683.60
mH
FULL
LOAD
CURRENT
Adc
3.25
2.75
2.30
2.25
1.50
1.30
1.25
0.85
0.65
0.50
0.70
0.46
0.39
0.32
0.22
0.20
0.19
MAXIMUM
DC
RESISTANCE
0.019
W
0.024
W
0.030
W
0.038
W
0.084
W
0.107
W
0.120
W
0.238
W
0.424
W
0.464
W
0.428
W
0.848
W
1.208
W
1.840
W
2.240
W
3.180
W
4.900
W
MODEL
NUMBER
618-R47M-02
618-R68M-02
618-1R0M-02
618-2R0M-02
618-5R0M-02
618-8R0M-02
618-100M-02
618-150M-02
618-200M-02
618-250M-02
618-330M-02
618-500M-02
618-680M-02
618-101M-02
618-151M-02
618-201M-02
618-301M-02
CIRCUIT
DIAGRAM
MAGNETICS GROUP
S
57 Stanley Avenue
S
Watertown, MA 02172-4802
S
Tel: (617) 926-6400
S
Fax: (617) 926-6249
Division of Espion Electronicas, S.A./Subsidiary of C&K Components, Inc.
17
Surface Mount Toroids
PC MOUNTING
518 Series Toroids With Iron Powder Core and 03 Case Size
PARALLEL
OPEN
CIRCUIT
INDUCTANCE
$20%
0.54
mH
0.71
mH
1.12
mH
1.89
mH
5.42
mH
8.70
mH
10.76
mH
16.17
mH
20.70
mH
26.82
mH
35.12
mH
51.78
mH
73.48
mH
109.77
mH
158.60
mH
216.39
mH
319.80
mH
MINIMUM
FULL LOAD
INDUCTANCE
0.37
mH
0.49
mH
0.71
mH
1.23
mH
3.18
mH
4.90
mH
5.80
mH
8.72
mH
13.24
mH
16.10
mH
20.30
mH
33.10
mH
44.08
mH
65.86
mH
90.88
mH
116.80
mH
172.70
mH
FULL
LOAD
CURRENT
Adc
6.20
5.70
5.40
4.60
3.20
2.80
2.70
2.20
1.50
1.40
1.30
0.92
0.84
0.68
0.64
0.60
0.50
MAXIMUM
DC
RESISTANCE
0.007
W
0.008
W
0.009
W
0.012
W
0.023
W
0.031
W
0.033
W
0.050
W
0.111
W
0.125
W
0.143
W
0.277
W
0.328
W
0.502
W
0.624
W
0.735
W
1.200
W
OPEN
CIRCUIT
INDUCTANCE
$20%
2.19
mH
2.86
mH
4.48
mH
7.57
mH
21.60
mH
34.80
mH
43.00
mH
64.68
mH
82.80
mH
107.50
mH
140.49
mH
207.10
mH
293.93
mH
439.08
mH
634.40
mH
865.50
mH
1276.00
mH
SERIES
MINIMUM
FULL LOAD
INDUCTANCE
1.48
mH
1.98
mH
2.85
mH
4.92
mH
12.70
mH
19.60
mH
23.20
mH
34.80
mH
52.95
mH
64.60
mH
81.22
mH
132.40
mH
176.32
mH
263.45
mH
363.52
mH
467.20
mH
690.80
mH
FULL
LOAD
CURRENT
Adc
3.10
2.85
2.70
2.30
1.60
1.40
1.35
1.10
0.75
0.70
0.65
0.46
0.42
0.32
0.32
0.30
0.25
MAXIMUM
DC
RESISTANCE
0.024
W
0.028
W
0.034
W
0.044
W
0.090
W
0.120
W
0.132
W
0.198
W
0.442
W
0.498
W
0.570
W
1.108
W
1.314
W
2.005
W
2.486
W
2.930
W
4.850
W
MODEL
NUMBER
518-R47M-03
518-R68M-03
518-1R0M-03
518-2R0M-03
518-5R0M-03
518-8R0M-03
518-100M-03
518-150M-03
518-200M-03
518-250M-03
518-330M-03
518-500M-03
518-680M-03
518-101M-03
518-151M-03
518-201M-03
518-301M-03
CIRCUIT
DIAGRAM
618 Series Toroids With Kool Mu
R
Core and 03 Case Size
PARALLEL
OPEN
CIRCUIT
INDUCTANCE
$20%
0.40
mH
0.63
mH
0.90
mH
2.00
mH
4.90
mH
8.10
mH
10.00
mH
15.63
mH
19.60
mH
25.60
mH
32.40
mH
50.63
mH
67.60
mH
99.23
mH
152.10
mH
202.50
mH
302.50
mH
MINIMUM
FULL LOAD
INDUCTANCE
0.28
mH
0.43
mH
0.58
mH
1.08
mH
2.60
mH
3.89
mH
4.55
mH
7.50
mH
10.45
mH
16.28
mH
19.41
mH
27.09
mH
36.62
mH
51.36
mH
98.66
mH
121.43
mH
158.19
mH
FULL
LOAD
CURRENT
Adc
6.00
5.00
4.80
4.70
3.00
2.80
2.70
2.00
1.50
0.98
0.96
0.94
0.80
0.70
0.38
0.39
0.40
MAXIMUM
DC
RESISTANCE
0.006
W
0.006
W
0.007
W
0.010
W
0.020
W
0.025
W
0.029
W
0.043
W
0.077
W
0.086
W
0.083
W
0.241
W
0.275
W
0.348
W
0.430
W
0.620
W
0.950
W
OPEN
CIRCUIT
INDUCTANCE
$20%
1.60
mH
2.50
mH
3.60
mH
8.00
mH
19.60
mH
32.40
mH
40.00
mH
62.50
mH
78.40
mH
102.40
mH
129.60
mH
202.52
mH
270.40
mH
396.92
mH
608.40
mH
810.00
mH
1210.00
mH
SERIES
MINIMUM
FULL LOAD
INDUCTANCE
1.12
mH
1.72
mH
2.32
mH
4.32
mH
10.40
mH
15.55
mH
18.20
mH
30.00
mH
41.80
mH
65.12
mH
77.64
mH
108.36
mH
146.48
mH
205.44
mH
394.64
mH
485.70
mH
632.70
mH
FULL
LOAD
CURRENT
Adc
3.00
2.50
2.40
2.35
1.50
1.40
1.35
1.00
0.75
0.49
0.48
0.47
0.40
0.35
0.19
0.20
0.20
MAXIMUM
DC
RESISTANCE
0.021
W
0.024
W
0.028
W
0.040
W
0.078
W
0.100
W
0.114
W
0.172
W
0.310
W
0.344
W
0.332
W
0.960
W
1.100
W
1.392
W
1.720
W
2.480
W
3.800
W
MODEL
NUMBER
618-R47M-03
618-R68M-03
618-1R0M-03
618-2R0M-03
618-5R0M-03
618-8R0M-03
618-100M-03
618-150M-03
618-200M-03
618-250M-03
618-330M-03
618-500M-03
618-680M-03
618-101M-03
618-151M-03
618-201M-03
618-301M-03
CIRCUIT
DIAGRAM
MAGNETICS GROUP
S
57 Stanley Avenue
S
Watertown, MA 02172-4802
S
Tel: (617) 926-6400
S
Fax: (617) 926-6249
Division of Espion Electronicas, S.A./Subsidiary of C&K Components, Inc.
18
Surface Mount Toroids
PC MOUNTING
518 Series Toroids With Iron Powder Core and 04 Case Size
PARALLEL
OPEN
CIRCUIT
INDUCTANCE
$20%
0.49
mH
0.76
mH
1.09
mH
1.95
mH
5.15
mH
7.81
mH
9.88
mH
14.76
mH
20.62
mH
25.65
mH
33.21
mH
48.80
mH
67.37
mH
99.09
mH
149.45
mH
200.11
mH
298.93
mH
MINIMUM
FULL LOAD
INDUCTANCE
0.38
mH
0.56
mH
0.82
mH
1.42
mH
3.55
mH
5.15
mH
6.68
mH
9.50
mH
13.45
mH
17.18
mH
22.92
mH
32.20
mH
43.05
mH
69.55
mH
101.46
mH
131.36
mH
188.05
mH
FULL
LOAD
CURRENT
Adc
7.90
7.20
5.90
4.60
3.30
3.00
2.50
2.30
1.90
1.60
1.30
1.20
1.10
0.72
0.64
0.60
0.54
MAXIMUM
DC
RESISTANCE
0.005
W
0.006
W
0.009
W
0.015
W
0.028
W
0.032
W
0.045
W
0.055
W
0.085
W
0.115
W
0.165
W
0.200
W
0.235
W
0.567
W
0.695
W
0.810
W
1.005
W
OPEN
CIRCUIT
INDUCTANCE
$20%
1.96
mH
3.04
mH
4.36
mH
7.80
mH
20.60
mH
31.22
mH
39.52
mH
59.04
mH
82.48
mH
102.60
mH
132.84
mH
195.20
mH
269.48
mH
396.36
mH
597.80
mH
800.45
mH
1195.70
mH
SERIES
MINIMUM
FULL LOAD
INDUCTANCE
1.50
mH
2.24
mH
3.26
mH
5.68
mH
14.20
mH
20.60
mH
26.72
mH
38.00
mH
53.80
mH
68.72
mH
91.68
mH
128.80
mH
172.18
mH
278.20
mH
405.80
mH
525.45
mH
752.15
mH
FULL
LOAD
CURRENT
Adc
3.95
3.60
3.00
2.30
1.65
1.50
1.25
1.15
0.95
0.80
0.65
0.60
0.55
0.36
0.32
0.30
0.27
MAXIMUM
DC
RESISTANCE
0.019
W
0.024
W
0.035
W
0.056
W
0.110
W
0.128
W
0.180
W
0.225
W
0.338
W
0.460
W
0.660
W
0.802
W
0.950
W
2.261
W
2.785
W
3.240
W
4.020
W
PART
NUMBER
518-R47M-04
518-R68M-04
518-1R0M-04
518-2R0M-04
518-5R0M-04
518-8R0M-04
518-100M-04
518-150M-04
518-200M-04
518-250M-04
518-330M-04
518-500M-04
518-680M-04
518-101M-04
518-151M-04
518-201M-04
518-301M-04
CIRCUIT
DIAGRAM
618 Series Toroids With Kool Mu
R
Core and 04 Case Size
PARALLEL
OPEN
CIRCUIT
INDUCTANCE
$20%
0.46
mH
0.83
mH
1.30
mH
1.87
mH
5.20
mH
7.48
mH
10.19
mH
15.02
mH
20.80
mH
25.16
mH
32.50
mH
49.97
mH
67.30
mH
100.60
mH
148.80
mH
199.80
mH
300.30
mH
MINIMUM
FULL LOAD
INDUCTANCE
0.33
mH
0.58
mH
0.89
mH
1.13
mH
2.70
mH
3.89
mH
5.11
mH
7.00
mH
11.00
mH
13.00
mH
16.51
mH
25.00
mH
35.40
mH
55.31
mH
77.40
mH
110.58
mH
149.00
mH
FULL
LOAD
CURRENT
Adc
7.00
6.00
5.00
5.90
4.40
3.50
3.40
3.00
2.10
2.00
1.80
1.50
1.20
0.92
0.82
0.64
0.62
MAXIMUM
DC
RESISTANCE
0.003
W
0.004
W
0.005
W
0.006
W
0.013
W
0.017
W
0.020
W
0.024
W
0.055
W
0.064
W
0.070
W
0.110
W
0.156
W
0.294
W
0.373
W
0.550
W
0.672
W
OPEN
CIRCUIT
INDUCTANCE
$20%
1.84
mH
3.32
mH
5.20
mH
7.48
mH
20.80
mH
29.92
mH
40.76
mH
60.08
mH
83.20
mH
100.64
mH
130.00
mH
199.88
mH
269.20
mH
402.40
mH
595.20
mH
799.20
mH
1201.20
mH
SERIES
MINIMUM
FULL LOAD
INDUCTANCE
1.32
mH
2.32
mH
3.56
mH
4.52
mH
10.80
mH
15.56
mH
20.40
mH
28.00
mH
44.00
mH
52.00
mH
66.04
mH
100.00
mH
141.60
mH
221.24
mH
309.60
mH
442.30
mH
596.00
mH
FULL
LOAD
CURRENT
Adc
3.50
3.00
2.50
2.92
2.20
1.75
1.70
1.50
1.05
1.00
0.90
0.75
0.60
0.46
0.41
0.32
0.31
MAXIMUM
DC
RESISTANCE
0.012
W
0.018
W
0.020
W
0.025
W
0.052
W
0.070
W
0.080
W
0.096
W
0.220
W
0.254
W
0.272
W
0.440
W
0.624
W
1.173
W
1.492
W
2.175
W
2.688
W
PART
NUMBER
618-R47M-04
618-R68M-04
618-1R0M-04
618-2R0M-04
618-5R0M-04
618-8R0M-04
618-100M-04
618-150M-04
618-200M-04
618-250M-04
618-330M-04
618-500M-04
618-680M-04
618-101M-04
618-151M-04
618-201M-04
618-301M-04
CIRCUIT
DIAGRAM
MAGNETICS GROUP
S
57 Stanley Avenue
S
Watertown, MA 02172-4802
S
Tel: (617) 926-6400
S
Fax: (617) 926-6249
Division of Espion Electronicas, S.A./Subsidiary of C&K Components, Inc.
19
微控制器 MCU
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