POWER RATING, %
All power and associated overload ratings are derated based upon case temperature using the derating curve. The case temperature is measured at the center of the metal mounting surface, with the part properly mounted and under electrical load. Without a heat sink, when in free air at +25°C, the MPM20 is rated for 2.25 watts. The thermal design should satisfy the following equation: Case Temperature (Tc ) + [Thermal Resistance (RθJC) x power applied (Watts)] ≤ TMAX considering the full operating temperature range of the application.
0
25
100
175
CASE TEMPERATURE, °C, TMAX = 175°C
Mounting Note: Mount on a smooth, clean and flat heat sink surface with a thermal interface material, such as thermal grease. The entire exposed metal backface portion must be in thermal contact with the heat sink. When screw mounting, use a compression washer which provides a mounting force of 150 to 300 pounds (665 to 1330 N). This will provide sufficient pressure on the package over time and through large temperature variations to maintain the maximum power dissipation capability. Mounting torque to avoid package damage is 8 in-lbs (0.90 N-m). For additional applications information regarding mounting and pulse handling see the Caddock Applications Notes at caddock.com or contact Applications Engineering.
Non-Inductive Design: MPM20 Kool-Tab Power Film Resistors are constructed with our Micronox resistance film fired onto a flat substrate which is thermally bonded to the copper heat sink tab. The resistor body is then molded to finish the TO-220 style package. The lead wire attachment and resistance element geometry are configured to provide outstanding non-inductive performance.
.400 ±.010 (10.16 ±.26)
C L
.142 ±.003 (3.61 ±.08) DIA.
.175 ±.015 (4.45 ±.38) .052 ±.003 (1.32 ±.08)
Metal Tab TO-220 Style MPM20
.240 ±.010 (6.10 ±.26)
MPM20 50.0 1% 0908
.117 ±.003 (2.97 ±.08)
.580 ±.010 (14.73 ±.26)

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