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High Energy

Wirewound

Axial Terminal / Surface Mount /

Heat Sinkable Packaging

Ohmite Manufacturing’s family

of

High Energy Wirewound

Resistors employ special

winding techniques to maxi-

mize the effective joule rating

of each resistor. Most wire-

wound resistors are wound

with the objective of meeting

the stated power (wattage)

rating and keeping cost low

through the use of automatic

winding equipment. Typically,

manufacturers will allow sub-

stitution of resistance wire,

depending on material avail-

ability. 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 rat-

ing and fusing current of a

wirewound resistor, and this

is often the reason that the

manufacturer does not publish

a fixed joule rating.

Type

Watts

Tolerance

Voltage

33Jxxx

Axial

3

5%

200

35Jxxx

Axial

5

5%

460

30Jxxx

Axial

10

5%

1000

825JxxxH

Heat Sinkable

25

5%

520

RH3R0DBxxxJ

Surface Mount

3

5%

200

1.5 / 38.1

33J: 0.593 / 15.1

35J: 1.000 / 25.4

30J: 1.900 / 46.8

33J: 0.218 / 5.5

35J: 0.343 / 8.7

30J: 0.406 / 10.3

33J: 20 ga.

35J: 18 ga.

30J: 18 ga.

RH3R0DBxxxJ: 0.612 / 15.545

0.273 / 6.934

825JxxxH: 1.938 / 49.23

0.546 / 13.87

in. / mm

ST ANDARD P AR T NUMBERS fo R 30 S ER i ES

Energy

Fusing

Current

Power to

Part Number

Ohms

Power

(J)

Energy (J) to fuse (A)

fuse (W)

33J1R0

1

3

12.70

53.26

23.93

572.60

33J5R0

5

3

6.25

26.20

10.03

502.96

33J10R

10

3

4.94

20.73

7.08

501.70

33J15R

15

3

4.66

19.55

5.95

531.47

33J20R

20

3

3.91

16.40

5.00

500.45

33J25R

25

3

3.07

12.89

4.20

441.79

33J30R

30

3

2.97

12.46

3.92

460.80

33J50R

50

3

2.43

10.20

2.97

440.68

33J100

100

3

1.92

8.07

2.10

439.58

35J1R5

1.5

5

76.55

321.19

40.32

2438.48

35J2R5

2.5

5

64.65

271.23

31.59

2494.75

35J7R5

7.5

5

37.66

158.01

16.90

2141.89

35J12R

12

5

37.90

158.99

14.20

2420.25

35J18R

18

5

28.80

120.84

11.13

2228.50

35J22R

22

5

27.48

115.29

10.03

2213.02

35J36R

36

5

22.78

95.59

7.86

2222.93

35J47R

47

5

23.22

97.42

7.08

2358.00

35J75R

75

5

18.77

78.77

5.55

2309.77

30J2R0

2

10

162.30

680.93

47.98

4603.79

30J4R7

4.7

10

150.86

632.92

33.88

5395.94

30J6R8

6.8

10

137.27

575.91

28.47

5513.41

30J15R

15

10

119.76

502.47

20.11

6065.77

30J27R

27

10

85.27

357.74

14.20

5445.56

30J33R

33

10

65.54

274.98

11.93

4700.40

30J50R

50

10

62.45

262.03

10.03

5029.59

30J82R

82

10

51.90

217.74

7.86

5063.34

30J100

100

10

49.41

207.28

7.08

5017.03

30J150

150

10

46.61

195.54

5.95

5314.71

825J1R0H

1

25

51.04

214.12

40.32

1625.65

825J5R0H

5

25

39.92

167.49

20.11

2021.92

825J10RH

10

25

31.58

132.50

14.20

2016.87

825J25RH

25

25

19.64

82.40

8.43

1776.01

825J36RH

36

25

17.79

74.62

7.08

1806.13

825J47RH

47

25

18.71

78.49

6.60

2049.57

825J75RH

75

25

14.66

61.49

5.00

1876.69

825J100H

100

25

12.29

51.56

4.20

1767.15

825J150H

150

25

11.59

48.64

3.53

1872.00

RH3R0DBR500J

0.5

3

12.93

54.25

31.59

498.95

RH3R0DB1R00J

1

3

10.23

42.91

22.31

497.70

RH3R0DB2R70J

2.7

3

6.87

28.82

13.24

473.33

RH3R0DB4R70J

4.7

3

5.87

24.63

10.03

472.78

RH3R0DB6R80J

6.8

3

5.34

22.41

8.43

483.07

RH3R0DB7R50J

7.5

3

4.75

19.91

7.86

463.11

RH3R0DB10R0J

10

3

3.98

16.70

6.60

436.08

RH3R0DB15R0J

15

3

3.75

15.75

5.55

461.95

RH3R0DB25R0J

25

3

3.07

12.89

4.20

441.79

RH3R0DB47R0J

47

3

2.28

9.59

2.97

414.24

RH3R0DB68R0J

68

3

2.08

8.72

2.49

423.26

RH3R0DB75R0J

75

3

2.29

9.62

2.49

466.83

RoHS compliant product available; Add “E” suffix to part number to specify.

Ohmite

High Energy

Wirewounds are hand

wound in order 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 in this family, Ohmite

can publish a fixed joule rating

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 packag-

ing, 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.

(continued)

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