IS175 Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Ultra Low Profile Power Resistors

THICK FILM
IS Series
Ultra Low Profile Power Resistors
F e at u r e s
• Heatsinkable
• Low profile
• High power
• Pulse handling capability
• Non-flammable
• Low inductances
• 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
uses
• 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 ERIE S S P ECI F ICATI O N S
Power Resistance
Rating Range
Type (watts) (Ω)
IS175 175 5Ω to 10KΩ
IS200 200 5Ω to 10KΩ
IS250 250 5Ω to 10KΩ
IS270 270 5Ω to 10KΩ
Tolerance
10%, 20%
10%, 20%
10%, 20%
10%, 20%
Construction
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
100
80
60
40
20
0
0
50 100 150 200 250
Resistor Surface Temp., oC
1
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax [phone] • www.ohmite.com • [e-mail]