MPM20 Kool-Tab
®
Power Film Resistors
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MPM20 Kool-Tab
®
Power Film Resistors introduce a ”Pure Tin Free” design for High Performance Applications. Our proven
Micronox
®
resistance film system is utilized in the widely accepted TO-220 Power Package to provide a compact 20 watt heat
sink mountable resistor. The non-inductive design makes this resistor ideal in high frequency communications, power switching
circuits and snubbers. The special performance features of the series MPM20 Kool-Tab
®
Power Film Resistors include:
Up to 20 Watt power rating at +25°C case temperature.
Resistance values as low as 0.020 ohm for current sense applications.
Non-Inductive Design.
Single screw mounting simplifies resistor attachment to the heat sink.
Low profile provides an easier fit in tight places.
A molded case for environmental protection.
Resistor element is electrically isolated from the metal heat sink tab.
“Pure Tin Free” design for High Performance Industrial and Military Applications
TO-220 Style Power Package with Metal Mounting Tab
Use your thermal design experience with power semiconductors in
TO-220 style power packages. This experience will help you get the most
out of this unique family of power resistors. The thermal design issues are
the same where power handling capability is based on the case temperature
which is maintained in your design.
Model
No.
MPM20
Resistance
Min.
0.020 Ω
Max.
10.0 K
Power
Rating
20 Watts
Max.
Voltage
*
Thermal Resistance
R
θ
JC
Film (
J
) to Case (
C
)
Dielect. Strength
V
RMS
AC
1,500
Leadwire
Solderable
300
7.50°C/Watt
DERATINg CURVE
100
80
60
40
20
*
Derating Using Case Temperature (TC):
Specifications:
Temperature Coefficient:
TC referenced to +25°C, ∆R taken at +175°C
5.00 ohms and above, -20 to +50 ppm/°C
1.00 ohm to 4.99 ohms, -20 to +80 ppm/°C
0.050 ohm to 0.99 ohm, 0 to +200 ppm/°C
0.020 ohm to 0.049 ohm, 0 to +300 ppm/°C
Resistance Tolerance:
±1% (±0.5% is available for
most resistance values).
Insulation Resistance:
10,000 Megohms, min.
Resitor element is electrically isolated from the
mounting surface.
Terminal Strength:
Mil-Std-202, Method 211,
Cond. A (Pull Test) 5 lbs.,
∆R
±(0.2 percent
+ 0.001 ohm) max.
Thermal Shock:
Mil-Std-202, Method 107, Cond.F,
∆R
±(0.3 percent + 0.001 ohm) max.
Momentary Overload:
2 times rated power with
applied voltage not to exceed 1.5 times maximum
continuous operating voltage for 5 seconds,
∆R
±(0.3 percent + 0.001 ohm) max.
Moisture Resistance:
Mil-Std-202, Method 106,
∆R
±(0.5 percent + 0.001 ohm) max.
Load Life:
2,000 hours at rated power,
∆R
±(1.0
percent + 0.001 ohm) max. Power rating depen-
dent upon case temperature. See derating curve.
Shock:
100G, Mil-Std-202, Method 213, Cond.
I,
∆R
±(0.2 percent + 0.001 ohm) max.
Vibration, High Frequency:
Mil-Std-202, Method
204, Cond. D,
∆R
±(0.2 percent + 0.001 ohm) max.
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 (R
θJC
) x power
applied (Watts)] ≤ T
MAX
considering the full operating temperature
range of the application.
0
25
100
175
CASE TEMPERATURE, °C, T
MAX
= 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)
Measurement Note: For these specifications, resistance
measurement shall be made at a point 0.2 inch (5 mm)
from the resistor body.
.540
±.040
(13.72
±1.02)
.032
±
.004 DIA.
(.81
±
.10)
.200
±.010
(5.08
±.26)
.097
±.010
(2.46
±.26)
Ordering Information:
Model Number:
MPM20 - 50.0 - 1%
DIMENSIONS IN INCHES AND (MILLIMETERS)
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
© 2010 Caddock Electronics, Inc.
CADDOCK
Resistor Value:
Tolerance
e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Sales and Corporate Office
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
IL-137.0810
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