F10F1R0E Datasheet, PDF (1/1 Pages) Ohmite Mfg. Co. – Thin Stackohm Vitreous Enamel Power

When limited space is a con- • All-welded construction.
sideration, choose Ohmite’s
• RoHS compliant product avail-
“thin” stackable 250 Type
able. Add “E” suffix to part num-
resistors. These oval-shaped
ber to specify.
ceramic-core resistors feature
a low profile to permit instal- S pe c i f i c at i ons
lation in spaces with height
restrictions. They are also
equipped with integral mount-
ing brackets so they can be
fastened to a chassis and
stacked in locations with lim-
ited surface area.
When properly fastened,
the mounting brackets add
a heat sinking benefit result-
ing in a smaller size per watt.
Durable 250 Type resistors are
fully welded and coated with
lead free vitreous enamel.
Material
Coating: Lead free vitreous
enamel.
Core: Ceramic.
Terminals: Tinned lug with hole.
RoHS solder composition is 96%
Sn, 3.5% Ag, 0.5% Cu
Derating: Linearly from 100% @
+25°C to 0% @ +350°C.
Electrical
Tolerance: ±5% (J)
Power rating: Based on mount-
ing a single resistor on a metal
surface measuring 10” (254mm)
F eat u r es
square by 0.04” (1.016mm)
thick. Reduce rating by 15%
• Small size-to-power ratio.
when mounting on non-metallic
• Stackable
surface.
• Integral mounting bracket con-
ducts heat to mounting surface.
• Low profile for use in equipment
where space is limited.
Overload: 10x rated wattage for
5 seconds if max. voltage is not
exceeded.
Temperature coefficient:
1 to 20Ω: ±400 ppm/°C.
ordering infO
Over 20Ω: ±260 ppm/°C
Series
RoHS Compliant
Dielectric withstanding
voltage: 500 VAC: 10 and
��������
20 watt rating. 1000 VAC:
30, 40 and 55 watt rat-
Coating Wattage
Blank = Vitreous
C = Centohm
S = Silicone
Tolerance
F = 1%
H = 3%
J = 5%
K = 10%
Ohms
1R0 = 1 Ω
250 = 250 Ω
1K0 = 1,000 Ω
25K = 25,000 Ω
25K5 = 25,500 Ω
ing (measured from lug to
mounting bracket)
To calculate max. amps:
use the formula √P/R
Made-to-order parts
See web-
Terminal Type
Tolerance RoHS
site for See “Resistor Terminals for Tubular Cores”
J = 5% Compliant
custom
core info _{� � � � � � � � � � � � � � �}
Series
Wattage &
Mounting Brackets
Ohms
Vitreous enamel: Core Code
(user supplies bracket for core TB) Example:
25 = 250 Fixed
See “Core and
B = Stacking box
1R00 = 1 Ω
26 = 260 Adjustable Terminal Selection” S = Stacking stud, std. height
250R = 250 Ω
Silicone ceramic:
45 = 450 Fixed
46 = 460 Adjustable
H = Stacking stud high
U = Unit type
1K00 = 1,000 Ω
25K0 = 25,000 Ω
25K5 = 25,500 Ω
250 Series
‘Thin’ Stackohm^®
Vitreous Enamel Power
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
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
30W, 40W & 55W
L
A
0.250" *
6.350 mm
0.438"
11.113 mm
*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 dissipation.
Series Wattage Ohms
F10 10 1.0-15K
F20 20 1.0-50K
F30 30 1.0-10K
F40 40 1.0-25K
F55 55 1.0-30K
Dimensions (in. /mm)
Max.
Length L
Length A Voltage*
0.750 / 19.050 1.000 / 25.400 187
2.000 / 50.800 2.313 / 58.750 815
1.250 / 31.750 2.000 / 50.800 281
2.000 / 50.800 2.750 / 69.850 655
3.500 / 88.900 4.250 / 107.950 1405
Adjustable versions available. Consult Ohmite.
Other sizes available. Consult Ohmite.
Also available in low cost Centohm or Silicone coating. Consult Ohmite.
* Maximum Voltage is based on Ohm’s Law [V=√P*R] as limited by the resistance
value of specified product
Wattage
Part No.
Prefix 
Suffix
1 –––1R0E     
1.5 –––1R5E

2 –––2R0E     
3 –––3R0E

4 –––4R0E

5 –––5R0E     
7.5 –––7R5E 

10 –––10RE  

15 –––15RE   
20 –––20RE 
25 –––25RE     
30 –––30RE 
40 –––40RE

Standard part numbers for 250 series
Wattage
Wattage
Part No.
Prefix 
Suffix
50 –––50RE 

75 –––75RE


100 –––100E     
150 –––150E

200 –––200E 

250 –––250E

300 –––300E

400 –––400E 

500 –––500E     
750 –––750E

800 –––800E

1,000 –––1K0E     
1,250 –––1K25E  
Part No.
Prefix 
Suffix
1,500 –––1K5E   

2,000 –––2K0E


2,500 –––2K5E     
3,000 –––3K0E 

4,000 –––4K0E


5,000 –––5K0E

6,000 –––6K0E
7,500 –––7K5E

10,000 –––10KE

15,000 –––15KE

20,000 –––20KE

25,000 –––25KE

40,000 –––40KE

 = Standard values; check availability
using the worldwide inventory
search at www.ohmite.com
Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax [phone] • www.ohmite.com • [e-mail] 33