RES-TEH70 Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Low thermal resistance

TEH70 Series
70 Watt TO247 Package
Thick Film Power
F e a t u r es
• 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)
c h a r a c te r i st i c s
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
Performance
±1% ∆R
±0.5% ∆R
±0.3% ∆R
±0.2% ∆R
Derating
100
70
80
56
60
42
40
28
20
14
0
0
0
25 50 75 100 125 150 175
Bottom of base plate Temperature, °C
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.  
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