RW Series
High Power SMD Wirewound Resistors
5 and 7 watt
Ohmite has used its thermal management expertise
to produce a unique resistor design. The resistor
body incorporates fins identical to a heatsink. These
fins, as with a heatsink, increase the surface area of
the part and allow for greater power dissipation. This
unique design allows a small footprint for the SMD
device and a high power dissipation. These 5 and 7
watt resistors are extremely stable with a load life
drift of only 1%. A special flat has been designed in
to the part for pick and place operations.
F e at u R e S
• Finned design facilitates cooling
• High Power Density
• Wide Resistance Range
• Tight Tolerance
• Low TCR
chaRacteRiSticS
RW5S0
Power
at 25°C
at 70°C
Resistance range
Non-inductive range
Tolerance
Temperature Coefficient
7 watts
5 watts
0.1Ω ~ 50K
0.1Ω ~ 12.5K
RW7S0
10 watts
7 watts
0.1Ω ~ 100K
0.1Ω ~ 20K
Derating
100
Percent Rated Power
80
60
40
20
0
0
25
50
75 100 125
Ambient Temperature, C
150
70
0.5%, 1%, 5%
0.1Ω ~ 0.99Ω: ±90ppm
1Ω ~ 10Ω: ±50ppm
10Ω+: ±20ppm
-55°C ~ +155°C
(PxR)
1/2
5.67g
11.34g
Operating temp. range
Max. working voltage
Weight
P e R F o R m a n c e D ata
Temp. cycle
(-55°C to 125°C, 1000 cycles)
Load Life
(1000 hours at 25°C)
Immersion
(260°C for 10 sec.)
Leaching
(260°C Solder immersion, 60 sec.)
Thermal Shock
(Units at -55°C, then rated power applied)
Flammability
UL Material rating
±0.5%+.05Ω
±1.0%+.05Ω
±0.1%+.05Ω
No visible leaching
No mechanical damage
UL94V0
(continued)
36
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RW Series
±0.020 in. / ±0.51 mm
Overall Dimensions
Length
RW7S0
RW5S0
1.128 / 28.65
0.806 / 20.47
Width
0.471 / 11.96
0.365 / 9.27
Height
0.406 / 10.31
0.51 / 12.95
High Power SMD Wirewound Resistors
5 and 7 watt
DimenSionS
Tape and Reel
FA (5S0)
Reel Hub Diameter
Reel Width
Pitch
Reel Outer Diameter
Tape Width
77mm
560mm
46mm
44mm
FB (7S0 )
560mm
46mm
44mm
77mm
Land Pattern
L
5S0 (FA)
7S0 (FB)
0.890 / 22.61
0.600 / 15.24
M
1.330 / 29.59
1.000 / 25.40
N
0.220 / 5.59
0.200 / 5.08
O
0.520 / 13.21
0.450 / 11.43
20mm
24mm
N
M
L
O
Power Rating and Temperature Rise
data based on the recommended
Land Patterns using 5 oz. copper
PCB. FR-4 material. 0.062" thick. 4
layer.
o R D e R i n g i n F o R m at i o n
Package
FA = 5W
FB = 7W
Package Modifier
A, B sequential
Tolerance
D = 0.50%
F = 1%
J = 5%
Standard part numbers For RW Series
T = Tape
and Reel
(optional)
5W=300/reel
7W=200/reel
Component type
R = resistor
Type of Base
S = standard
Resistance
0.10
1.0
10
20
47
100
470
1000
4700
10,000
1.0
10
100
1000
10,000
100,000
Tolerance
1%
1%
5%
5%
5%
5%
5%
5%
5%
5%
1%
1%
1%
1%
1%
1%
Part Number
RW5S0FAR100FE
RW5S0FA1R00FE
RW5S0FA10R0JE
RW5S0FA20R0JE
RW5S0FA47R0JE
RW5S0FA100RJE
RW5S0FA470RJE
RW5S0FA1K00JE
RW5S0FA4K70JE
RW5S0FA10K0JE
RW7S0FB1R00FE
RW7S0FB10R0FE
RW7S0FB100RFE
RW7S0FB1K00FE
RW7S0FB10K0FE
RW7S0FB100KFE
RW5S0FA1K00FET
Component Modifier Wattage
70°C 25°C
5S0 =
5W 7W
W = wirewound
7S0 =
7W 10W
E = RoHS compliant
Resistance Value
R = Decimal Examples:
K = 1,000
R249 = 0.249 ohms
M = 1,000,000 24R9 = 24.9 ohms
2K49 = 2,490 ohms
rev 3/18-1
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
37
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