Ohmite IS250 Ultra low profile power resistor Datasheet

THICK FILM
IS Series
Ultra Low Profile Power Resistors
HEAT
SINKABLE
F e at u r e s
• Heatsinkable
• Low profile
• High power
• Pulse handling capability
• Non-flammable
• Low inductances
• Available with fast-on terminals 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
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)
Derating
120
Working voltage Not to exceed 300V
Over-vlotage rating 5X rated power for up to for up to
1 second
Resistive element Thick Film
% Rated Power
Hot spot surface temperature 200°C max.
Derating element surface temp. at 100% to
0% power at 200°C surface temp.
Power rating dependent on mounting and heatsink 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 temperature 25°C (ref AH32430 12" long)
1
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]
100
80
60
40
20
0
0
50
100
150
200
Resistor Surface Temp., oC
250
THICK FILM
IS Series
HEAT
SINKABLE
Ultra Low Profile Power Resistors
d i m e ns i ons
(in/mm)
Thickness: 0.04 in. / 0.9mm ±.1
Type
IS175
IS200
IS250
IS270
L
Wattage L ±0.1mm W ±0.1mm
175 1.94/49.30 1.41/35.90
200 2.40/61.00 1.60/40.60
250 4.00/101.60 2.76/70.00
270 4.80/122.00 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
W
D
T e r m i n a t i on O p t i ons
Solder pad only
SnAg (96S)
Flying leads
Push-on
connectors
9mm
0.250"
10" 14AWG
9mm
O R D ERI N G I N F O R M ATI 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 = 47Ω
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 • [email protected]
0.032"
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