1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
36
RW Series
High Power SMD Wirewound Resistors
5 and 7 watt
FEATURES
•Finneddesignfacilitatescooling
•HighPowerDensity
•WideResistanceRange
•TightTolerance
•LowTCR
PERFORMANCE DATA
RW5S0 RW7S0
Power
at 25°C
at 70°C
7 watts
5 watts
10 watts
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
-55°C ~ +155°C
Max. working voltage
(PxR)
1/2
Weight
5.67g 11.34g
CHARACTERISTICS
Temp. cycle
(-55°C to 125°C, 1000 cycles) ±0.5%+.05Ω
Load Life
(1000 hours at 25°C) ±1.0%+.05Ω
Immersion
(260°C for 10 sec.) ±0.1%+.05Ω
Leaching
(260°C Solder immersion, 60 sec.) No visible leaching
Thermal Shock
(Units at -55°C, then rated power applied) No mechanical damage
Flammability
UL Material rating UL94V0
Derating
100
Percent Rated Power
Ambient Temperature, oC
60
20
0
80
40
25 50 100 15075
70
0 125
Ohmitehasuseditsthermalmanagementexpertise
toproduceauniqueresistordesign.Theresistor
bodyincorporatesfinsidenticaltoaheatsink.These
fins,aswithaheatsink,increasethesurfaceareaof
thepartandallowforgreaterpowerdissipation.This
uniquedesignallowsasmallfootprintfortheSMD
deviceandahighpowerdissipation.These5and7
wattresistorsareextremelystablewithaloadlife
driftofonly1%.Aspecialflathasbeendesignedin
tothepartforpickandplaceoperations.
(continued)