TEH70 Series
70 Watt TO247 Package
Thick Film Power
F E aT u r E S
• 70 Watt power rating at 25°C case temperature
• Non-inductive performance
• Low thermal resistance
• RoHS compliant design
• Two or three terminal versions available
• Heat sink can be grounded through middle terminal (P style)
cHaracTEriSTicS
Resistor
thick film on alumina
Lead
solder coated phosphor bronze
Solder
100% Sn
Case
high temperature plastic
P Package
middle terminal is electrically connected
to header and insulated from left and
right terminals
M Package
no middle terminal
Derating
linear, 100% at 25°C to 0% at 150°C
Resistance range
2Ω-10KΩ
Max. working voltage
500V or Ohm’s Law limited
Thermal Resistance
1.79°C/W
Temperature
2Ω-10Ω: ±100ppm
Coefficient
10Ω-10KΩ: ±50ppm
Insulation Resistance
400 MΩ
Short time overload
2x rated power for 5 sec., not to exceed
1.5x max. working voltage
Dielectric Strength
2000 VDC
Test Conditions Of Test
Load life
1000 hrs @ rated power
Moisture
MIL -STD-202, method 106
resistance
Short time
2x rated power for 5 sec., not to
overload
exceed 1.5x max. working voltage
Solderability
MIL-STD-202, method 208
Thermal
MIL-STD-202, method 170, cond. F
shock
±0.2% ∆R
Performance
±1% ∆R
±0.5% ∆R
±0.3% ∆R
Derating
100
80
60
40
20
0
0
25
50
75
100
125
150
Bottom of base plate Temperature,
°C
175
70
56
42
28
14
0
Percent Rated Power
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 es-
tablish the power rating. Best technique is to attach a
thermocouple to the side of the base plate of the resis-
tor. Temperature of plastic housing or heat sink cannot
be used to establish rating of the resistor.
(continued)
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
151
Wattage
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