High energy Wirewound
Axial Terminal / Surface Mount / Heat Sinkable Packaging
Ohmite Manufacturing’s family of High Energy
Wirewound Resistors employ special winding tech-
niques to maximize the effective joule rating of each
resistor. Most wirewound resistors are wound with
the objective of meeting the stated power (watt-
age) rating and keeping cost low through the use
of automatic winding equipment. Typically, manu-
facturers will allow substitution of resistance wire,
depending on material availability. On tight tolerance
wirewounds some type of abrasive adjustment to the
resistance wire is often used to maximize production
yields. Both of these procedures can adversely affect
the joule rating and fusing current of a wirewound
resistor, and this is often the reason that the manu-
facturer does not publish a fixed joule rating.
Ohmite High Energy Wirewounds are wound so
as to maintain the tightest possible pitch (space
between windings) and thereby maximize the mass
of the resistive element. Since no wire substitutions
are allowed, and no abrasive adjusting is permitted
Series
33Jxxx
35Jxxx
30Jxxx
825JxxxH
RH3R0DBxxxJ
Type
Axial
Axial
Axial
Heat Sinkable
Surface Mount
in this family, Ohmite can publish a fixed joule rat-
ing and fusing current for each part number in the
series.
This technique can be applied to any wirewound
product. In order to provide the broadest selection of
packaging, Ohmite has developed standard offerings
in three different package types-axial, SMD, and heat
sinkable. Other sizes and types can be quoted on
request, such as tubular power resistors.
Watts
3
5
10
25
3
Tolerance
5%
5%
5%
5%
5%
Voltage
200
460
1000
520
200
s e R i e s s P e C i F i C AT i o n s
Dimensions
in. /
mm
1.5 /
38.1
33J:
0.593 /
15.1
35J:
1.000 / 25.4
30J:
1.900 /
46.8
825JxxxH:
1.938 /
49.23
0.546 /
13.87
33J:
20 ga.
35J:
18 ga.
30J:
18 ga.
RH3R0DBxxxJ:
0.612 /
15.545
0.273 /
6.934
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
0.226 /
5.740
61
1.080 /
27.43
33J:
0.218 / 5.5
35J:
0.343 /
8.7
30J:
0.406 /
10.3
High energy Wirewound
Axial Terminal / Surface Mount / Heat Sinkable Packaging
o R D e R i n g i n F o R m AT i o n
Standard Part Numbers
Part Number
33J1R0
33J5R0
33J10R
33J15R
33J20R
33J25R
33J30R
33J50R
33J100
35J1R5
35J2R5
35J7R5
35J12R
35J18R
35J22R
35J36R
35J47R
35J75R
30J2R0
30J4R7
30J6R8
30J15R
30J27R
30J33R
30J50R
30J82R
30J100
30J150
825J1R0H
825J5R0H
825J10RH
825J25RH
825J36RH
825J47RH
825J75RH
825J100H
825J150H
RH3R0DBR500J
RH3R0DB1R00J
RH3R0DB2R70J
RH3R0DB4R70J
RH3R0DB6R80J
RH3R0DB7R50J
RH3R0DB10R0J
RH3R0DB15R0J
RH3R0DB25R0J
RH3R0DB47R0J
RH3R0DB68R0J
RH3R0DB75R0J
Ohms
1
5
10
15
20
25
30
50
100
1.5
2.5
7.5
12
18
22
36
47
75
2
4.7
6.8
15
27
33
50
82
100
150
1
5
10
25
36
47
75
100
150
0.5
1
2.7
4.7
6.8
7.5
10
15
25
47
68
75
Power
3
3
3
3
3
3
3
3
3
5
5
5
5
5
5
5
5
5
10
10
10
10
10
10
10
10
10
10
25
25
25
25
25
25
25
25
25
3
3
3
3
3
3
3
3
3
3
3
3
Energy
(J)
12.70
6.25
4.94
4.66
3.91
3.07
2.97
2.43
1.92
76.55
64.65
37.66
37.90
28.80
27.48
22.78
23.22
18.77
162.30
150.86
137.27
119.76
85.27
65.54
62.45
51.90
49.41
46.61
51.04
39.92
31.58
19.64
17.79
18.71
14.66
12.29
11.59
12.93
10.23
6.87
5.87
5.34
4.75
3.98
3.75
3.07
2.28
2.08
2.29
Fusing
Current
Energy (J) to fuse (A)
53.26
26.20
20.73
19.55
16.40
12.89
12.46
10.20
8.07
321.19
271.23
158.01
158.99
120.84
115.29
95.59
97.42
78.77
680.93
632.92
575.91
502.47
357.74
274.98
262.03
217.74
207.28
195.54
214.12
167.49
132.50
82.40
74.62
78.49
61.49
51.56
48.64
54.25
42.91
28.82
24.63
22.41
19.91
16.70
15.75
12.89
9.59
8.72
9.62
23.93
10.03
7.08
5.95
5.00
4.20
3.92
2.97
2.10
40.32
31.59
16.90
14.20
11.13
10.03
7.86
7.08
5.55
47.98
33.88
28.47
20.11
14.20
11.93
10.03
7.86
7.08
5.95
40.32
20.11
14.20
8.43
7.08
6.60
5.00
4.20
3.53
31.59
22.31
13.24
10.03
8.43
7.86
6.60
5.55
4.20
2.97
2.49
2.49
Power to
fuse (W)
572.60
502.96
501.70
531.47
500.45
441.79
460.80
440.68
439.58
2438.48
2494.75
2141.89
2420.25
2228.50
2213.02
2222.93
2358.00
2309.77
4603.79
5395.94
5513.41
6065.77
5445.56
4700.40
5029.59
5063.34
5017.03
5314.71
1625.65
2021.92
2016.87
1776.01
1806.13
2049.57
1876.69
1767.15
1872.00
498.95
497.70
473.33
472.78
483.07
463.11
436.08
461.95
441.79
414.24
423.26
466.83
RoHS compliant product available; Add “E” suffix to part number to specify.
Other values available, contact Ohmite for details.
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
63
PCB Design
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