MP800 Series Kool-Pak Power Film Resistors
TO-220 Style and TO-126 Style - Non-Inductive Designs
Page 1 of 2
Use your thermal design experience with power semiconductors in TO-220 and
TO-126 style power packages to 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.
MP820 and MP821 TO-220 Style Power Package
with Metal Mounting Tab
20 Watts at +25C Case Temperature derated to zero at +175C.
Metal Heat Sink Mounting Tab.
MP820 Resistance Range of 10.0 ohm to 10.0 K.
MP821 Resistance Range of 0.020 ohm to 9.99 ohm.
Resistor element is electrically isolated from the mounting surface.
MP821 Standard Resistance Values:
Non-Inductive design for high speed switching, snubbers,
Tolerance MP821: 1% Standard (0.5%, 2%, 5%, 10%, and 20%
and rf applications.
are available for most resistance values).
0.020 0.050 0.25 0.75 3.00 7.50
Construction of MP820 and MP821: 0.025 0.075 0.30 1.00 3.30 8.00
0.030 0.10 0.33 1.50 4.00
The MP820 and MP821 Kool-Tab Power Film Resistors are constructed with Caddock's 0.033 0.15 0.40 2.00 5.00
0.040 0.20 0.50 2.50
Micronox resistance lm red onto a at ceramic substrate which is thermally bonded to
the copper heat sink tab. The resistor body is then molded with a high temperature
MP820 Standard Resistance Values:
molding compound to nish the metal tab TO-220 package. The lead wire attachment
Tolerance MP820: 1% Standard (0.5%, 2%, 5%, 10%, and 20%
and resistance element geometry are congured to provide outstanding non-inductive
are available for most resistance values).
performance. 10.0 30.0 75.0 300 750 3.30 K
12.0 33.0 100 330 1.00 K 4.00 K
15.0 40.0 120 400 1.50 K 5.00 K
20.0 47.0 150 470 2.00 K 7.50 K
MP825 and MP850 Power Film Resistors
25.0 50.0 200 500 2.50 K 10.0 K
27.0 56.0 250 560 3.00 K
Include an Integral Metal Mounting Surface
for Highly Efcient Thermal Transfer
MP825 TO-126 Style Power Package
25 Watts at +25C Case Temperature derated to zero at +150C.
Copper Heat Sink Integral in the Molded Package.
Resistance Range of 0.020 ohm to 10.0 K.
Resistor element is electrically isolated from the mounting surface.
Non-inductive Design.
MP850 TO-220 Style Power Package
50 Watts at +25C Case Temperature derated to zero at +150C.
Copper Heat Sink Integral in the Molded Package.
Resistance Range of 0.20 ohm to 10.0 K.
MP825 Standard Resistance Values:
Resistor element is electrically isolated from the mounting surface.
Tolerance MP825: 1% standard (except as noted), (0.5%, 2%,
Non-inductive Design.
5%,10%, and 20% are available for most resistance values).
0.020 5% 0.30 4.00 33.0 300 3.00 K
Construction of MP825 and MP850:
0.025 5% 0.33 5.00 40.0 330 3.30 K
0.030 5% 0.40 7.50 47.0 400 4.00 K
The MP825 and MP850 Kool-Pak Power Film Resistors are constructed with Caddock's
0.033 5% 0.50 8.00 50.0 470 5.00 K
Micronox resistance lm red onto a at ceramic substrate. The ceramic substrate is
0.040 5% 0.75 10.0 56.0 500 7.50 K
0.050 1.00 12.0 75.0 560 10.0 K
bonded to a copper heat sink which becomes the metal mounting surface. This
0.075 1.50 15.0 100 750
assembly is molded with the copper heat sink ush with the back surface of the part. The
0.10 2.00 20.0 120 1.00 K
terminal attachment and resistance element geometry are congured to provide
0.15 2.50 25.0 150 1.50 K
0.20 3.00 27.0 200 2.00 K
outstanding non-inductive performance.
0.25 3.30 30.0 250 2.50 K
MP850 Standard Resistance Values:
Ordering Information:
MP850 - 50.0 - 1%
Tolerance MP850: 1% standard, (0.5%, 2%, 5%,10%, and 20%
are available for most resistance values).
Model Number: Tolerance
2.50 K
0.20 2.00 12.0 50.0 330
Resistor Value:
3.00 K
0.25 2.50 15.0 56.0 400
3.30 K
0.30 3.00 20.0 75.0 470
Packaging: MP800 Series Resistors are packaged in plastic shipping tubes,
4.00 K
0.33 3.30 25.0 100 500
50 pieces per tube when the order quantity permits. 5.00 K
0.40 4.00 27.0 120 560
7.50 K
0.50 5.00 30.0 150 750
For custom resistance values and tolerances contact applications engineering
10.0 K
0.75 7.50 33.0 200 1.00 K
1.00 8.00 40.0 250 1.50 K
1.50 10.0 47.0 300 2.00 K
Certain products shown in this catalog are covered by one or more patents, there are also patents pending.
Applications Engineering Sales and Corporate Ofce
17271 North Umpqua Hwy. 1717 Chicago Avenue
CADDOCK
Roseburg, Oregon 97470-9422 Riverside, California 92507-2364
e-mail: caddock@caddock.com web: www.caddock.com
Phone: (541) 496-0700 Phone: (951) 788-1700
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Fax: (541) 496-0408 Fax: (951) 369-1151
2004 Caddock Electronics, Inc. 28_IL103.1004Page 2 of 2
Thermal Resistance
Resistance
Model
Power Max.
Max. Temp.
R
Package JC Dimensions Comments
No.
Rating Voltage
Min. Max. T MAX
Film (J) to Case (C)
Metal Mounting Tab
MP820 TO-220 Style 10.0 10.0 K 20 Watts* 300 175 C Figure 1
7.50C/Watt
Power
MP821 TO-220 Style 0.020 9.99 20 Watts* 7.50C/Watt 175 C Figure 1 Metal Mounting Tab
Limited
Integral Metal Mounting Surface
MP825 0.020 25 Watts* Figure 2
TO-126 Style 10.0 K 300 5.00C/Watt 150 C
in Molded Package
Integral Metal Mounting Surface
MP850 TO-220 Style 0.20 10.0 K 150 C Figure 3
50 Watts* 300 2.50C/Watt
in Molded Package
Derating Curve
Specications:
100
80
Derating Using Case Temperature (T ): Temperature Coefcient:
* C
60
TC referenced to +25C, R taken at T
All power and associated overload ratings are derated
MAX
40 based upon case temperature using the derating curve.
A The case temperature is measured at the center of the
5.00 ohms and above, -20 to +50 ppm/C
B
20
metal mounting surface, with the part properly mounted
0.50 ohm to 4.99 ohms, -20 to +80 ppm/C
0 and under electrical load. Without a heat sink, when in
0.050 ohm to 0.49 ohm, 0 to +200 ppm/C
25 100 150 175
free air at +25C, the MP820, MP821, and MP850 are
CASE TEMPERATURE, C 0.020 ohm to 0.049 ohm, 0 to +300 ppm/C
rated for 2.25 watts, the MP825 is rated for 1.25 watts.
A - MP825 / MP850 Max. Temperature, TMax = 150 C
B - MP820 / MP821 Max. Temperature, TMax = 175 C
Operating Temperature: -55C to T
MAX
The thermal design should satisfy the following equation:
Case Temperature (T ) + [Thermal Resistance (R ) x power applied (Watts)] T considering the full
Inductance: 10nH typical in series when mea-
c JC MAX
operating temperature range of the application.
sured at a point 0.2 inches from the resistor body.
Mounting Note: Mount on a smooth, clean and at 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.
DWV: The dielectric strength rating of 1500 V AC
rms
When screw mounting, use a compression washer which provides a mounting force of 150 to 300 pounds
is based upon connections made between
(665 to 1330 N). This will provide sufcient pressure on the package over time and through large temperature
terminals shorted and either the metal surface the
variations to maintain the maximum power dissipation capability. Mounting torque to avoid package damage
part is mounted to or a metal clip in contact with the
is 8 in-lbs (0.90 N-m). If a spring clip is used, a clip force of 8 to 30 pounds (35 to 130 N) is recommended to
top surface of the part.
be applied to the center of the package. The clip should be round or smooth in the contact area to avoid
concentrating the load on a small point of the plastic body of the package. Another mounting option is to use
a pressure bar method which can achieve a greater mounting force with a greater contact area.
Insulation Resistance: 10,000 Megohms, min.
The resistor element is electrically isolated from
For additional applications information regarding mounting and pulse handling see the Caddock
the mounting surface.
Applications Notes at caddock.com or contact Applications Engineering.
Load Stability: 2,000 hours at rated power.
.400 .010 .142 .003 .175 .015 R (1.0 percent + 0.001 ohm) max. Power rating
(10.16 .26) (3.61 .08) DIA. (4.45 .38)
dependent upon case temperature. See derating
.052 .003
C (1.32 .08)
L
curve.
.240 .010
(6.10 .26)
Momentary Overload:
.580 .010
Figure 1 .117 .003
(14.73 .26)
(2.97 .08) MP820, MP821, MP850: 2 times rated power with
MP820
Metal Tab
50.0
applied voltage not to exceed 1.5 times maximum
1%
TO-220 Style
continuous operating voltage for 5 seconds.
MP820 and MP821
R (0.3 percent + 0.001 ohm) max.
.540 .040
.032 .004 DIA.
(13.72 1.02)
(.81 .10)
MP825: 1.5 times rated power with applied
voltage not to exceed 1.5 times maximum
.200 .010 .097 .010
(5.08 .26) (2.46 .26) continuous operating voltage for 5 seconds.
R (0.3 percent + 0.001 ohm) max.
.094 .004 .320 .010 .110 .010
(2.39 .10) DIA. (8.12 .26) (2.79 .26)
C
L
Moisture Resistance: Mil-Std-202, Method 106.
+ R (0.5 percent + 0.001 ohm) max.
Figure 2
.440 .010
(11.18 .26)
TO-126 Style .080 .020 .115 .010
MP825
(2.03 .51) 0.10 (2.92 .26)
Thermal Shock: Mil-Std-202, Method 107, Cond. F.
1%
MP825
.053 .007 R (0.3 percent + 0.001 ohm) max.
(1.35 .18)
.450 .050
(11.43 1.27)
.030 .004
Shock: 100G, Mil-Std-202, Method 213, Cond. I.
(.76 .10)
R (0.2 percent + 0.001 ohm) max.
.023 .004
(.58 .10)
.200 .010
(5.08 .26)
.058 .007
(1.47 .18) Vibration, High Frequency: Mil-Std-202, Method
.410 .010
.125 .004 204, Cond. D. R (0.2 percent + 0.001 ohm)
(10.41 .26)
(3.18 .10) DIA. .125 .010
max.
(3.18 .26)
C
L
Terminal Strength: Mil-Std-202, Method 211,
Figure 3
.640 .010
.125 .010
Cond. A (Pull Test) 5 lbs. R (0.2 percent
TO-220 Style (16.26 .26)
(3.18 .26)
MP850 + 0.001 ohm) max.
.130 .030
MP850
10.0
(3.30 .76)
1%
Terminal Material: Solderable
.053 .007
(1.35 .18)
.500 .050
.030 .004
(12.70 1.27)
(.76 .10) Measurement Note: For these specications,
resistance measurement shall be made at a point
.025 .004
.200 .010
(.64 .10)
0.2 inch (5.08 mm) from the resistor body.
(5.08 .26)
DIMENSIONS IN INCHES AND (MILLIMETERS) .070 .010
(1.78 .26)
Applications Engineering Sales and Corporate Ofce
17271 North Umpqua Hwy. 1717 Chicago Avenue
CADDOCK
Roseburg, Oregon 97470-9422 Riverside, California 92507-2364
e-mail: caddock@caddock.com web: www.caddock.com
Phone: (541) 496-0700 Phone: (951) 788-1700
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Fax: (541) 496-0408 Fax: (951) 369-1151
2004 Caddock Electronics, Inc. 28_IL103.1004
POWER RATING, %