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

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