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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)