RWSERIES Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – High Power SMD Wirewound Resistors 5 and 7 watt

WIREWOUND
SURFACE MOUNT
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
RW7S0
Derating
Power 5 watts
7 watts
100
Resistance range 0.1Ω ~ 50K
0.1Ω ~ 100K
80
Non-inductive range 0.1Ω ~ 12.5K
0.1Ω ~ 20K
60
Tolerance
0.5%, 1%, 5%
40
Temperature Coefficient
0.1Ω ~ 0.99Ω: ±90ppm
1Ω ~ 10Ω: ±50ppm
20
10Ω+: ±20ppm
0
Operating temp. range
-55°C ~ +155°C
0
Max. working voltage
(PxR)^1/2
Weight 5.67g
11.34g
25 50 75 100 125 150
Ambient Temperature, °C
P e rf o r m a n c e D ATA
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
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