*R
*RoHS
oH C
S OM
CO P
M LIA
PL N
IA T
NT
Features
■
Formerly
J. .Miller
model
W
■
Current rating up to 920 mA
■
Inductance range: 1.0
µH
to 1,000
µH
■
RoHS compliant*
Applications
■
DC/DC converters
■
Power supplies
■
General use
77F Series Conformal Coated RF Choke
Electrical Specifications (@ 25
°C)
Inductance
Bourns Part No.
77F-1R0K-RC
77F-1R2K-RC
77F-1R5K-RC
77F-1R8K-RC
77F-2R2K-RC
77F-2R7K-RC
77F-3R3K-RC
77F-3R9K-RC
77F-4R7K-RC
77F-5R6K-RC
77F-5R8K-RC
77F-8R2K-RC
77F-100K-RC
77F-120K-RC
77F-150K-RC
77F-180K-RC
77F-220K-RC
77F-270K-RC
77F-330J-RC
77F-390J-RC
77F-470J-RC
77F-560J-RC
77F-680J-RC
77F-820J-RC
77F-101J-RC
77F-121J-RC
77F-151J-RC
77F-181J-RC
77F-221J-RC
77F-271J-RC
77F-331J-RC
77F-391J-RC
77F-471J-RC
77F-561J-RC
77F-681J-RC
77F-821J-RC
77F-102J-RC
µ
(µH)
1.0
1.2
1.5
1.8
2.2
2.7
3.3
3.9
4.7
5.6
6.8
8.2
10
12
15
18
22
27
33
39
47
56
68
82
100
120
150
180
220
270
330
390
470
560
680
820
1000
Tol. (%)
±10
±10
±10
±10
±10
±10
±10
±10
±10
±10
±10
±10
±10
±10
±10
±10
±10
±10
±5
±5
±5
±5
±5
±5
±5
±5
±5
±5
±5
±5
±5
±5
±5
±5
±5
±5
±5
Q
Min.
45
50
50
55
55
60
65
65
70
70
75
80
85
75
70
65
60
55
55
50
45
40
40
35
30
70
70
70
70
65
65
65
60
60
55
55
50
Test
Frequency
(MHz)
25.2
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
2.52
2.52
2.52
2.52
2.52
2.52
2.52
2.52
2.52
2.52
2.52
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
SRF
(MHz)
Min.
157
144
131
121
110
100
94
86
80
74
68
53
45
34
20
14
9.9
7.6
6.3
6.3
6.3
6.2
5.7
5.3
4.8
3.8
3.5
3.3
3.0
2.8
2.6
2.4
2.25
2.10
1.95
1.85
1.40
DCR
Ω
(Ω)
Max.
0.17
0.18
0.20
0.22
0.24
0.25
0.30
0.35
0.40
0.45
0.50
0.52
0.65
0.70
0.75
0.80
0.90
1.00
1.10
1.20
1.30
1.50
1.80
2.00
2.50
3.0
4.0
4.5
5.0
6.0
6.5
7.5
8.5
9.5
12.0
14.0
20.0
Idc
(mA)
920
880
830
790
750
720
670
640
620
590
550
530
500
480
460
430
410
390
370
350
340
320
305
290
275
185
175
165
155
145
137
133
126
120
113
105
100
General Specifications
Temperature Rise .................35 °C at Idc
Operating Temperature ..-55 °C to +105 °C
Storage Temperature......-55 °C to +105 °C
Dielectric Strength....................500 Vrms
Materials
Core...............................................Ferrite
Wire ..............................Polyester copper
Terminal Coating .............Sn-Ag-Cu alloy
Coating .................................Epoxy resin
Packaging .....5000 pcs. per 14-inch reel
How To Order
77F - 151J - TR - RC
Model
Value Code
(See table)
Packaging Code
TR = 5000 pcs./14-inch reel
Compliance Code
RC = RoHS compliant*
Example:
77F-102J-TR-RC = 1000
µH
packaged 5000 pcs./
14-inch reel.
Electrical Schematic
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
77F Series Conformal Coated RF Choke
Product Dimensions
25.4
(1.0)
MIN.
10.41
(0.41)
MAX.
Typical Part Marking - EIA Color Code
Color
1st & 2nd
Significant Figure
Multiplier
Tolerance
0.64
(0.025)
3.99
MAX.
(0.157)
DIMENSIONS:
MM
(INCHES)
Silver
Gold
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Gray
White
0
1
2
3
4
5
6
7
8
9
0.01
0.1
1
10
100
1000
±10 %
±5 %
Example for L value less than 10 µH
6.8 µH, ±10 %
1st signifi cant fi gure (Blue)
2nd signifi cant fi gure (Gray)
Multiplier (Gold)
Tolerance (Silver)
Example for L value 10 µH and higher
270 µH, ±5 %
1st signifi cant fi gure (Red)
2nd signifi cant fi gure (Purple)
Multiplier (Brown)
Tolerance (Gold)
REV. 10/08
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
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