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IS250 Datasheet(PDF) 1 Page - Ohmite Mfg. Co.

Part # IS250
Description  Ultra Low Profile Power Resistors
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Manufacturer  OHMITE [Ohmite Mfg. Co.]
Direct Link  http://www.ohmite.com
Logo OHMITE - Ohmite Mfg. Co.

IS250 Datasheet(HTML) 1 Page - Ohmite Mfg. Co.

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1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
136
I
S Series
Ultra Low Profile Power Resistors
Fea ture S
•Heatsinkable
•Lowprofile
•Highpower
•Pulsehandlingcapability
•Non-flammable
•Lowinductances
•Availablewithfast-onterminalsorwireleads
characteri S tic S
TCR
<250ppm (surface temp less than 150°C)
Maximum element
temperature
365°C
Working voltage
Not to exceed 300V
Over-voltage rating
5X rated power for up to for up to 1 second
Resistive element
Film
Derating
element surface temp. at 100% to 0% power
at 200°C surface temp.
Power rating
dependent on mounting and heatsink ther-
mal capacity
Hot spot surface
temperature
200°C max.
Pulsed load at full
pulse power rating
1,000 cycles
Max. 1%ΔR; (see Fig 1)
Mounted on a 0.06°C/W heatsink with
forced air cooling, air temperature 25°C (ref
AH32430 12" long)
Solder
Silver solder is recommended for IS Series
resistors. Leaching of the silver in the termi-
nation will occur if non-silver solder is used.
60/40 tin-lead solders are not recommended
for use with the IS Series product.
Screw torque
3.5 Nm
S erie S SP eci F icati ONS
Power Resistance
Rating
Range
Type (watts)
(Ω)
Tolerance
IS175 175 5Ω to 10KΩ 10%, 20%
IS200 200 5Ω to 10KΩ 10%, 20%
IS250 250 5Ω to 10KΩ 10%, 20%
IS270 270 5Ω to 10KΩ 10%, 20%
Derating
Construction
Resistor Surface Temp., C
250
0
50
100
150
200
40
0
60
80
120
20
100
Termination
Dielectric
Glass Overcoat
Resistive Glaze
Stainless Steel
u S e S
•Brakingresistors
•In-rushcurrentlimiter
•Bleederresistor
•Powerswitching
THIS PRODUCT IS
DESIGNED FOR USE WITH
PROPER HEATSINKING.
Maximumbaseplatetemperatureof
theresistormustbemonitoredand
keptwithinspecifiedlimitstoestab-
lishthepowerrating.Besttechnique
istoattachathermocoupletothe
sideofthebaseplateoftheresistor.
•Ruggedconstruction
•Ultralowprofilethick-
filmonsteel
•175Wto270Wsizes
•Singlefixingheatsink
mountable
•Softcharging
(continued)


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