1140 Series

MAGNETICS
Revised March 12, 2014
Changes to Bourns® Model 1140
High Current Choke Series
Bourns is announcing changes to the Model 1140 High Current Choke Series including
manufacturing location, the core slot radius, marking method, winding polarity mark, Minimum
Order Quantity (MOQ), Multiples Quantity (Mult), rated current and the center mounting hole
diameter. The complete list of affected part numbers are listed in Table 1 on the following page.
The manufacturing location is being transferred from Guangdong, China to Xiamen, China to help
streamline the production process. To improve core production yield and reduce core chipping, the
core slot radius has been increased (Figure 1). The marking methods have also been changed from
an ink-marking to a more durable laser-marking (Figure 2). Another change is the addition of a
winding polarity mark, which indicates the start lead of winding (Figure 2). The Minimum Order
Quantity (MOQ) / Multiples Quantity (Mult) has changed from 240/24 to 140/70. Rated current,
Idc, is redefined with Irms and Isat (Table 1). Lastly, the center mounting hole diameter has been
modified (Figure 3).
Qualification tests include drop and humidity, resistance to soldering heat, solderability,
temperature rise, terminal strength and thermal shock. The tests were performed with satisfactory
results. Evaluation samples are available upon request.
The appearance (i.e., the form) of component is slightly different due to the changed marking
method and core slot modification. There is no impact to the fit, function, quality or reliability of
the component.
Implementation dates are as follows:
We will begin phasing in this process: June 16, 2014
Date that manufacturing of existing products will cease: June 13, 2014
First date code using the above changes: 1425
IC1349 REV.
Changes to Bourns® Model 1140 High Current Choke Series
March, 2014
Page 2 of 3
Table 1
Part Number
1140-1R8M-RC
1140-2R2M-RC
1140-2R7M-RC
1140-3R3M-RC
1140-3R9M-RC
1140-4R7M-RC
1140-5R6M-RC
1140-6R8M-RC
1140-8R2M-RC
1140-100K-RC
1140-120K-RC
1140-150K-RC
1140-180K-RC
1140-220K-RC
1140-270K-RC
1140-330K-RC
1140-390K-RC
1140-470K-RC
1140-560K-RC
1140-680K-RC
1140-820K-RC
1140-101K-RC
1140-121K-RC
1140-151K-RC
Before
Change
Idc (A)
27
27
27
27
27
27
27
27
27
27
27
27
27
21
21
21
21
14.4
14.4
14.4
14.4
14.4
14.4
11.4
After
Change
Irms (A)
Isat(A)
34.5
80.0
34.5
80.0
28.1
80.0
28.1
80.0
28.1
80.0
28.1
80.0
24.4
80.0
24.4
73.5
24.4
70.3
21.8
65.3
21.8
59.6
19.9
53.9
17.2
49.2
16.2
43.7
16.0
39.0
15.8
36.5
15.1
32.3
12.3
30.6
12.0
27.6
11.4
25.2
10.9
23.1
10.5
20.6
9.9
18.6
8.3
16.9
Part Number
1140-181K-RC
1140-221K-RC
1140-271K-RC
1140-331K-RC
1140-391K-RC
1140-471K-RC
1140-561K-RC
1140-681K-RC
1140-821K-RC
1140-102K-RC
1140-122K-RC
1140-152K-RC
1140-182K-RC
1140-222K-RC
1140-272K-RC
1140-332K-RC
1140-392K-RC
1140-472K-RC
1140-562K-RC
1140-682K-RC
1140-822K-RC
1140-103K-RC
1140-123K-RC
1140-153K-RC
Before
Change
Idc (A)
11.4
11.4
11.4
11.4
9
7.2
7.2
7.2
7.2
5.5
5.5
4.5
4.5
4
4
2.8
2.8
2
2
1.6
1.6
1.3
1.3
1.3
After
Change
Irms (A)
Isat(A)
7.8
15.5
7.4
14.0
7.0
12.4
6.1
11.2
5.8
10.4
4.9
9.5
4.7
8.6
4.4
7.9
4.2
7.2
3.6
6.5
3.4
5.9
2.9
5.3
2.8
4.9
2.4
4.4
2.2
3.9
1.9
3.6
1.8
3.3
1.6
3.0
1.3
2.8
1.2
2.5
1.2
2.3
1.0
2.1
0.9
1.9
0.9
1.7
Figure 1
Before Change - Small Radius
After Change - Larger Radius
Changes to Bourns® Model 1140 High Current Choke Series
March, 2014
Page 3 of 3
Figure 2
Before Change - with Ink Marking
After Change - with Laser Marking
and Polarity Mark
Figure 3
0.177 ± 0.016
0.177 ± 0.016
0.275 +0.012/-0.020
Before Change 0.177 “ dia. through-hole with
0.275 “ dia. shoulder
After Change 0.177 “ dia. through-hole
If you have any questions or need additional information, please feel free to contact Customer
Service/Inside Sales.
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