Wirewound RW5 and RW7 Series0 pages
WIREWOUND
SURFACE MOUNT
RW Series
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.
Commercial
High Power SMD Wirewound Resistors
5 and 7 watt
F e at u r e s
•tFinned design facilitates cooling
•tHigh Power Density
•tWide Resistance Range
•tTight Tolerance
•tLow TCR
Characteristics
RW7S0
Derating
7 watts
Resistance range 0.1Ω ~ 50K
0.1Ω ~ 100K
Non-inductive range 0.1Ω ~ 12.5K
0.1Ω ~ 20K
Tolerance
0.5%, 1%, 5%
Temperature Coefficient
0.1Ω ~ 0.99Ω: ±90ppm
1Ω ~ 10Ω: ±50ppm
10Ω+: ±20ppm
Operating temp. range
100
Percent Rated Power
RW5S0
Power 5 watts
-55°C ~ +155°C
80
60
40
20
0
0
(PxR)1/2
Max. working voltage
Weight 5.67g
25
50
75 100 125
Ambient Temperature, °C
150
11.34g
P e rf 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)
±1.0%+.05Ω
±0.1%+.05Ω
No visible leaching
No mechanical damage
UL94V0
REV 4694
Flammability UL Material rating
±0.5%+.05Ω
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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