WireWoUND
SUrFaCe moUNT
RW Series
High Power SMD Wirewound Resistors
5 and 7 watt
F ꢀ at u R ꢀ S
•ꢀFinnedꢀdesignꢀfacilitatesꢀcooling
•ꢀHighꢀPowerꢀDensity
•ꢀWideꢀResistanceꢀRange
•ꢀTightꢀTolerance
Ohmiteꢀhasꢀusedꢀitsꢀthermalꢀmanagementꢀexpertiseꢀ
toꢀproduceꢀaꢀuniqueꢀresistorꢀdesign.ꢀTheꢀresistorꢀ
bodyꢀincorporatesꢀfinsꢀidenticalꢀtoꢀaꢀheatsink.ꢀTheseꢀ
fins,ꢀasꢀwithꢀaꢀheatsink,ꢀincreaseꢀtheꢀsurfaceꢀareaꢀofꢀ
theꢀpartꢀandꢀallowꢀforꢀgreaterꢀpowerꢀdissipation.ꢀThisꢀ
uniqueꢀdesignꢀallowsꢀaꢀsmallꢀfootprintꢀforꢀtheꢀSMDꢀ
deviceꢀandꢀaꢀhighꢀpowerꢀdissipation.ꢀTheseꢀ5ꢀandꢀ7ꢀ
wattꢀresistorsꢀareꢀextremelyꢀstableꢀwithꢀaꢀloadꢀlifeꢀ
driftꢀofꢀonlyꢀ1%.ꢀAꢀspecialꢀflatꢀhasꢀbeenꢀdesignedꢀinꢀ
toꢀtheꢀpartꢀforꢀpickꢀandꢀplaceꢀoperations.
•ꢀLowꢀTCR
chaRactꢀRꢁStꢁcS
RW5S0
RW7S0
Derating
5 watts
7 watts
Power
Resistance range
Non-inductive range
Tolerance
100
80
60
40
20
0
0.1Ω ~ 50K
0.1Ω ~ 12.5K
0.1Ω ~ 100K
0.1Ω ~ 20K
0.5%, 1%, 5%
0.1Ω ~ 0.99Ω: ±90ppm
1Ω ~ 10Ω: ±50ppm
10Ω+: ±20ppm
Temperature Coefficient
0
25
50
75 100 125 150
-55°C ~ +155°C
(PxR)1/2
Operating temp. range
Max. working voltage
Weight
Ambient Temperature, °C
5.67g
11.34g
PꢀRFoRmancꢀ Data
(-55°C to 125°C, 1000 cycles)
(1000 hours at 25°C)
±0.5%+.05Ω
Temp. cycle
±1.0%+.05Ω
Load Life
Immersion
(260°C for 10 sec.)
±0.1%+.05Ω
(260°C Solder immersion, 60 sec.)
(Units at -55°C, then rated power applied)
UL Material rating
No visible leaching
No mechanical damage
UL94V0
Leaching
Thermal Shock
Flammability
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