Ohmite 33Jxxx Series, 35Jxxx Series, 30Jxxx Series, 825JxxxH Series, RH3R0DBxxxJ Series Data Sheet

High Energy Wirewound

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

0.226 / 5.740

825JxxxH: 1.938 / 49.23

1.080 / 27.43

0.546 / 13.87

in. / mm

Axial Terminal / Surface Mount / Heat Sinkable Packaging

Ohmite Manufacturing’s family of High Energy
Wirewound Resistors employ special winding tech­niques to maximize the effective joule rating of each
resistor. Most wirewound 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 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 manu­facturer 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

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
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.

SERIES SPECIFICATIONS

Series 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

DIMENSIONS

61

Energy (J)

0

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

20

40

60

80

100

120

140

160

180

Fusing Energy (J)

0

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

100

200

300

400

500

600

700

Fusing Current (A)

0

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

10

20

30

40

50

Energy (J)

0

-1R0H

-5R0H

-10RH

-25RH

-36RH

-47RH

-75RH

-100H

-150H

Fusing Energy (J)

825J-

Energy (J)

0

-R500J

-1R00J

-2R70J

-4R70J

-6R80J

-7R50J

-10R0J

-15R0J

-25R0J

-47R0J

-68R0J

-75R0J

RH3R0DB-

0

-1R0H

-5R0H

-10RH

-25RH

-36RH

-47RH

-75RH

-100H

-150H

825J-

Fusing Energy (J)

0

-R500J

-1R00J

-2R70J

-4R70J

-6R80J

-7R50J

-10R0J

-15R0J

-25R0J

-47R0J

-68R0J

-75R0J

RH3R0DB-

Fusing Current (A)

0

-1R0H

-5R0H

-10RH

-25RH

-36RH

-47RH

-75RH

-100H

-150H

825J-

Fusing Current (A)

0

-R500J

-1R00J

-2R70J

-4R70J

-6R80J

-7R50J

-10R0J

-15R0J

-25R0J

-47R0J

-68R0J

-75R0J

RH3R0DB-

10

20

30

40

50

60

50

100

150

200

250

5

10

15

20

25

30

35

40

45

2

4

6

8

10

12

14

0

10

20

30

40

50

60

5

10

15

20

25

30

35

High Energy Wirewound

Axial Terminal / Surface Mount / Heat Sinkable Packaging

PERFORMANCE CHARACTERISICS

62

(continued)