THICK FILM
I
S Series
HEAT
SINKABLE
Ultra Low Profile Power Resistors
F e at u r e S
• Heatsinkable
• Low profile
• High power
• Pulse handling capability
• Non-flammable
• Low inductances
uSeS
• Available with fast-on ter-
minals or wire leads
• Rugged construction
• Ultra low profile thick-film
on steel
• 175W to 270W sizes
• Single fixing heatsink
mountable
• Braking resistors
• In-rush current limiter
• Bleeder resistor
• Power switching
• Soft charging
THIS PRODUCT IS DESIGNED
FOR USE WITH PROPER HEATSINKING.
Maximum base plate temperature of the resistor must be monitored and kept
within specified limits to establish the power rating. Best technique is to attach a
thermocouple to the side of the base plate of the resistor.
S e r i e S S P e c i F i c at i O N S
Type
IS175
IS200
IS250
IS270
Power
Rating
(watts)
175
200
250
270
Resistance
Range
(Ω)
5Ω to 10KΩ
5Ω to 10KΩ
5Ω to 10KΩ
5Ω to 10KΩ
Construction
Tolerance
10%, 20%
10%, 20%
10%, 20%
10%, 20%
Dielectric Termination
Glass Overcoat
Resistive Glaze
Stainless Steel
characteriSticS
TCR
<250ppm (surface temp less than
150°C)
Hot spot surface temperature
200°C max.
Working voltage
Not to exceed 300V
Over-vlotage rating
5X rated power for up to for up to
1 second
Resistive element
Thick Film
Derating
element surface temp. at 100% to
0% power at 200°C surface temp.
Power rating
dependent on mounting and heat-
sink thermal capacity
Maximum element
365°C
temperature
Pulsed load at full pulse
Max. 1%ΔR; (see Fig 1)
power rating 1,000 cycles
Mounted on a 0.06°C/W heatsink
with forced air cooling, air tempera-
ture 25°C (ref AH32430 12" long)
Derating
120
% Rated Power
100
80
60
40
20
0
0
50
100
150
200
Resistor Surface Temp., C
250
1
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
THICK FILM
I
S Series
HEAT
SINKABLE
Ultra Low Profile Power Resistors
DiMeNSiONS
(in/mm)
Thickness: 0.04 in. / 0.9mm ±.1
Type
IS175
IS200
IS250
IS270
Wattage
175
200
250
270
L ±0.1mm
1.94/49.30
2.40/61.00
4.00/101.60
4.80/122.00
W ±0.1mm
1.41/35.90
1.60/40.60
2.76/70.00
2.76/70.00
ØD nom. Wt. nom (oz/g)
0.13/3.20 0.44/12.60
0.21/5.30 0.60/17.10
0.21/5.30 1.78/50.80
0.21/5.30 2.12/60.70
L
W
D
t e r M i N at i O N O P t i O N S
Solder pad only
SnAg (96S)
9mm
10" 14AWG
9mm
Flying leads
Push-on
connectors
0.250"
0.032"
O r D e r i N G i N F O r M at i O N
Tolerance
K = 10%
RoHS
M = 20%
Compliant
IS200C47RKE
Series
Wattage Termination
Resistance
Insulated
175
A = Tinned pad
3 digits
Steel
200
B = Soldered lead 47R = 47
250
C = Fast on terminal
270
2
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
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