F20F5K0E View Datasheet(PDF) - Ohmite Mfg. Co.
Part Name
Description
Manufacturer
F20F5K0E Datasheet PDF : 4 Pages
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250 Series
‘Thin’ Stackohm®
Vitreous Enamel Power
(in. / mm)
0.031"
0.794 mm
Diam.
0.125"
3.175 mm
0.110":
2.776 mm
0.250"
6.350 mm
0.125"
3.175 mm
Diam.
0.196"
4.979 mm
0.250"
6.350 mm
0.125"
3.175 mm
d i m e ns i ons
Diam.
0.063"
1.588 mm
0.125"
3.175 mm
0.625"
15.875 mm
10W & 20W
L
A
0.125" *
3.175 mm
0.375"
9.525 mm
Diam.
0.109"
2.776 mm
0.188"
4.763 mm
Series
F10
F20
F30
F40
F55
Wattage
10
20
30
40
55
Length L
0.750 / 19.050
2.000 / 50.800
1.250 / 31.750
2.000 / 50.800
3.500 / 88.900
Length A
1.000 / 25.400
2.313 / 58.750
2.000 / 50.800
2.750 / 69.850
4.250 / 107.950
*Reference dimension only; varies according to resistance
value.
Note: When resistors are stacked, use washers or spacers
as required to insure clearance and improve power dissipa-
tion.
30W, 40W & 55W
L
A
0.250" *
6.350 mm
0.438"
11.113 mm
Mo u n t i n g
In addition to the standard box bracket, stud type brackets
are available for stacking the standard size resistors. Stud
type brackets are available in two heights: standard (SS,
0.437â€/11.113mm) and high (SSH, 0.531â€/13.494mm). The
SSH stud is recommended when stacking the adjustable Type
260, as it assures clearance for the adjustable lugs to pass
eachother. Spacer washer No. 6027 (O.D. 0.219â€/5.556mm,
I.D. 0.125â€/3.175mm, thickness 0.094â€/2.381mm) is recom-
mended for use with the miniature adjustable and fixed resis-
tors to provide clearance, as explained above, or increased
wattage. See chart.
Derating for stacked mounting
Stacked resistors should be derated to prevent excessive tem-
peratures due to proximity. Approximate ratings are given in
the table.
Percent of Single Unit Rating
No. of
Resistors
Std. or Inter.
Miniature
Miniature with
0.094†(2.381 mm)
Spacer Washer
2
70
70
75
3
60
60
69
4
50
50
60
0.031"
0.794 mm
Diam.
0.125"
3.175 mm
0.110":
2.776 mm
0.250"
6.350 mm
0.125"
Diam. 3.175 mm
0.063"
1.588 mm
L
A
0.625"
15.875 mm
B
W
T
0.375"
9.525 mm
Core
size
0.094"
2.381 mm
Diam.
0.196"
4.979 mm
0.188"
4.763 mm
0.125"
3.175 mm
0.125"
Diam. 3.175 mm
0.063"
1.588 mm
L
A
0.125"
3.175 mm
B
0.813"
Diam.
20.638 mm 0.196"
4.979 mm
T
Core
size
0.438"
11.113 mm
0.250"
6.350 mm
0.125"
3.175 mm
0.188"
Diam. 4.763 mm
0.109"
2.776 mm
B
W
L
A
T
Core
size
0.438"
11.113 mm
0.125"
3.175 mm
Diam.
0.196"
4.979 mm
0.250"
6.350 mm
0.125"
3.175 mm
0.188"
Diam. 4.763 mm
0.109"
2.776 mm
L
A
0.125"
3.175 mm
B
W
T
Core
size
0.156" x0.313"
3.969 x 7.938 mm
Slot
0.188"
4.763 mm
0.438"
0.531"
11.113 mm 13.494 mm
(SS)
(SSH)
0.188"
Diam. 4.763 mm
0.109"
2.776 mm
L
A
Brackets
cemented
in core
B
W
T
Core
size
0.5"
12.7 mm
(continued)
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
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