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 +25°C Case Temperature
derated to zero at +175°C.
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.
Non-Inductive design for high speed switching, snubbers,
and rf applications.
MP821 Standard Resistance Values:
0.020
Ω
0.025
Ω
0.030
Ω
0.033
Ω
0.040
Ω
0.050
Ω
0.075
Ω
0.10
Ω
0.15
Ω
0.20
Ω
0.25
Ω
0.30
Ω
0.33
Ω
0.40
Ω
0.50
Ω
0.75
Ω
1.00
Ω
1.50
Ω
2.00
Ω
2.50
Ω
3.00
Ω
3.30
Ω
4.00
Ω
5.00
Ω
Tolerance MP821: ±1% Standard (0.5%, 2%, 5%, 10%, and 20%
are available for most resistance values).
7.50
Ω
8.00
Ω
Construction of MP820 and MP821:
The MP820 and MP821 Kool-Tab
®
Power Film Resistors are constructed with Caddock's
Micronox
®
resistance film fired onto a flat ceramic substrate which is thermally bonded to
the copper heat sink tab. The resistor body is then molded with a high temperature
molding compound to finish the metal tab TO-220 package. The lead wire attachment
and resistance element geometry are configured to provide outstanding non-inductive
performance.
MP820 Standard Resistance Values:
10.0
Ω
12.0
Ω
15.0
Ω
20.0
Ω
25.0
Ω
27.0
Ω
30.0
Ω
33.0
Ω
40.0
Ω
47.0
Ω
50.0
Ω
56.0
Ω
75.0
Ω
100
Ω
120
Ω
150
Ω
200
Ω
250
Ω
300
Ω
330
Ω
400
Ω
470
Ω
500
Ω
560
Ω
750
Ω
1.00 K
1.50 K
2.00 K
2.50 K
3.00 K
Tolerance MP820: ±1% Standard (0.5%, 2%, 5%, 10%, and 20%
are available for most resistance values).
3.30 K
4.00 K
5.00 K
7.50 K
10.0 K
MP825 and MP850 Power Film Resistors
Include an Integral Metal Mounting Surface
for Highly Efficient Thermal Transfer
MP825
TO-126 Style Power Package
•
•
•
•
•
•
•
•
•
•
25 Watts at +25°C Case Temperature
derated to zero at +150°C.
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.
50 Watts at +25°C Case Temperature
derated to zero at +150°C.
Copper Heat Sink Integral in the Molded Package.
Resistance Range of 0.20 ohm to 10.0 K.
Resistor element is electrically isolated from the mounting surface.
Non-inductive Design.
MP850
TO-220 Style Power Package
MP825 Standard Resistance Values
:
0.020
Ω
5%
0.025
Ω
5%
0.030
Ω
5%
0.033
Ω
5%
0.040
Ω
5%
0.050
Ω
0.075
Ω
0.10
Ω
0.15
Ω
0.20
Ω
0.25
Ω
0.30
Ω
0.33
Ω
0.40
Ω
0.50
Ω
0.75
Ω
1.00
Ω
1.50
Ω
2.00
Ω
2.50
Ω
3.00
Ω
3.30
Ω
4.00
Ω
5.00
Ω
7.50
Ω
8.00
Ω
10.0
Ω
12.0
Ω
15.0
Ω
20.0
Ω
25.0
Ω
27.0
Ω
30.0
Ω
33.0
Ω
40.0
Ω
47.0
Ω
50.0
Ω
56.0
Ω
75.0
Ω
100
Ω
120
Ω
150
Ω
200
Ω
250
Ω
300
Ω
330
Ω
400
Ω
470
Ω
500
Ω
560
Ω
750
Ω
1.00 K
1.50 K
2.00 K
2.50 K
Construction of MP825 and MP850:
Tolerance MP825: ±1% standard (except as noted), (0.5%, 2%,
5%,10%, and 20% are available for most resistance values).
3.00 K
3.30 K
4.00 K
5.00 K
7.50 K
10.0 K
The MP825 and MP850 Kool-Pak
®
Power Film Resistors are constructed with Caddock's
Micronox
®
resistance film fired onto a flat ceramic substrate.
The ceramic substrate is
bonded to a copper heat sink which becomes the metal mounting surface.
This
assembly is molded with the copper heat sink flush with the back surface of the part. The
terminal attachment and resistance element geometry are configured to provide
outstanding non-inductive performance.
Ordering Information:
Model Number:
MP850 - 50.0 - 1%
MP850 Standard Resistance Values
:
Tolerance
0.20
Ω
0.25
Ω
0.30
Ω
0.33
Ω
0.40
Ω
0.50
Ω
0.75
Ω
1.00
Ω
1.50
Ω
2.00
Ω
2.50
Ω
3.00
Ω
3.30
Ω
4.00
Ω
5.00
Ω
7.50
Ω
8.00
Ω
10.0
Ω
12.0
Ω
15.0
Ω
20.0
Ω
25.0
Ω
27.0
Ω
30.0
Ω
33.0
Ω
40.0
Ω
47.0
Ω
50.0
Ω
56.0
Ω
75.0
Ω
100
Ω
120
Ω
150
Ω
200
Ω
250
Ω
300
Ω
330
Ω
400
Ω
470
Ω
500
Ω
560
Ω
750
Ω
1.00 K
1.50 K
2.00 K
Tolerance MP850: ±1% standard, (0.5%, 2%, 5%,10%, and 20%
are available for most resistance values).
2.50 K
3.00 K
3.30 K
4.00 K
5.00 K
7.50 K
10.0 K
Resistor Value:
Packaging:
MP800 Series Resistors are packaged in plastic shipping tubes,
50 pieces per tube when the order quantity permits.
For custom resistance values and tolerances contact applications engineering
Certain products shown in this catalog are covered by one or more patents, there are also patents pending.
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
© 2004 Caddock Electronics, Inc.
CADDOCK
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
28_IL103.1004
Model
No.
MP820
MP821
Package
TO-220 Style
TO-220 Style
TO-126 Style
TO-220 Style
Resistance
Min.
Max.
10.0
Ω
0.020
Ω
0.020
Ω
0.20
Ω
Power
Rating
20 Watts
*
20 Watts
*
25 Watts
*
50 Watts
*
Max.
Voltage
300
Power
Limited
300
300
Thermal Resistance
R
θ
JC
Film (
J
) to Case (
C
)
Page 2 of 2
Max. Temp.
T
MAX
Dimensions
Figure 1
Figure 1
Figure 2
Figure 3
Comments
Metal Mounting Tab
Metal Mounting Tab
Integral Metal Mounting Surface
in Molded Package
Integral Metal Mounting Surface
in Molded Package
10.0 K
9.99
Ω
10.0 K
10.0 K
7.50°C/Watt
7.50°C/Watt
5.00°C/Watt
2.50°C/Watt
175°C
175°C
150°C
150°C
MP825
MP850
100
Derating Curve
Specifications:
POWER RATING, %
80
60
40
20
A
B
*
Derating Using Case Temperature (TC):
0
25
100
150
175
CASE TEMPERATURE,
°C
A - MP825 / MP850 Max. Temperature, T
Max
= 150°C
B - MP820 / MP821 Max. Temperature, T
Max
= 175°C
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 MP820, MP821, and MP850 are
rated for 2.25 watts, the MP825 is rated for 1.25 watts.
Temperature Coefficient:
TC referenced to +25°C,
ΔR
taken at T
MAX
5.00 ohms and above, -20 to +50 ppm/°C
0.50 ohm to 4.99 ohms, -20 to +80 ppm/°C
0.050 ohm to 0.49 ohm, 0 to +200 ppm/°C
0.020 ohm to 0.049 ohm, 0 to +300 ppm/°C
Operating Temperature:
-55°C to T
MAX
Inductance:
10nH typical in series when mea-
sured at a point 0.2 inches from the resistor body.
DWV:
The dielectric strength rating of 1500 V
rms
AC
is based upon connections made between
terminals shorted and either the metal surface the
part is mounted to or a metal clip in contact with the
top surface of the part.
Insulation Resistance:
10,000 Megohms, min.
The resistor element is electrically isolated from
the mounting surface.
Load Stability:
2,000 hours at rated power.
ΔR
±(1.0 percent + 0.001 ohm) max. Power rating
dependent upon case temperature. See derating
curve.
Momentary Overload:
MP820, MP821, MP850: 2 times rated power with
applied voltage not to exceed 1.5 times maximum
continuous operating voltage for 5 seconds.
ΔR
±(0.3 percent + 0.001 ohm) max.
MP825: 1.5 times rated power with applied
voltage not to exceed 1.5 times maximum
continuous operating voltage for 5 seconds.
ΔR
±(0.3 percent + 0.001 ohm) max.
Moisture Resistance:
Mil-Std-202, Method 106.
ΔR
±(0.5 percent + 0.001 ohm) max.
Thermal Shock:
Mil-Std-202, Method 107, Cond. F.
ΔR
±(0.3 percent + 0.001 ohm) max.
Shock:
100G, Mil-Std-202, Method 213, Cond. I.
ΔR
±(0.2 percent + 0.001 ohm) max.
Vibration, High Frequency:
Mil-Std-202, Method
204, Cond. D.
ΔR
±(0.2 percent + 0.001 ohm)
max.
Terminal Strength:
Mil-Std-202, Method 211,
Cond. A (Pull Test) 5 lbs.
ΔR
±(0.2 percent
+ 0.001 ohm) max.
Terminal Material:
Solderable
Measurement Note:
For these specifications,
resistance measurement shall be made at a point
0.2 inch (5.08 mm) from the resistor body.
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.
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). If a spring clip is used, a clip force of 8 to 30 pounds (35 to 130 N) is recommended to
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.
For additional applications information regarding mounting and pulse handling see the Caddock
Applications Notes at caddock.com or contact Applications Engineering.
.400
±.010
(10.16
±.26)
C
L
.142
±.003
(3.61
±.08)
DIA.
.175
±.015
(4.45
±.38)
.052
±.003
(1.32
±.08)
Figure 1
Metal Tab
TO-220 Style
MP820 and MP821
.240
±.010
(6.10
±.26)
MP820
50.0
1%
.117
±.003
(2.97
±.08)
.580
±.010
(14.73
±.26)
.540
±.040
(13.72
±1.02)
.032
±
.004 DIA.
(.81
±
.10)
.200
±.010
(5.08
±.26)
.097
±.010
(2.46
±.26)
.110
±.010
(2.79
±.26)
.094
±.004
(2.39
±.10)
DIA.
.320
±.010
(8.12
±.26)
C
L
Figure 2
TO-126 Style
MP825
+
.080
±.020
(2.03
±.51)
MP825
0.10
Ω
1%
.115
±.010
(2.92
±.26)
.053
±
.007
(1.35
±
.18)
.030
±.004
(.76
±
.10)
.200
±.010
(5.08
±.26)
.440
±.010
(11.18
±.26)
.450
±.050
(11.43
±1.27)
.023
±
.004
(.58
±.10)
.058
±.007
(1.47
±.18)
.125
±.010
(3.18
±.26)
.125
±.004
(3.18
±.10)
DIA.
.410
±.010
(10.41
±.26)
C
L
Figure 3
TO-220 Style
MP850
.130
±.030
(3.30
±.76)
MP 850
10.0
1%
.125
±.010
(3.18
±.26)
.640
±.010
(16.26
±.26)
.500
±.050
(12.70
±1.27)
.053
±
.007
(1.35
±
.18)
.030
±.004
(.76
±
.10)
DIMENSIONS IN INCHES AND (MILLIMETERS)
.200
±.010
(5.08
±.26)
.025
±
.004
(.64
±.10)
.070
±.010
(1.78
±.26)
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
© 2004 Caddock Electronics, Inc.
CADDOCK
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
28_IL103.1004
