R θ JC
Model
No.
MP820
Package
TO-220 Style
Resistance
Min. Max.
10.0 ? 10.0 K
Power
Rating
20 Watts *
Max.
Voltage
300
Thermal Resistance
Film ( J ) to Case ( C )
7.50 ° C/Watt
Max. Temp.
T MAX
175 ° C
Dimensions
Figure 1
Page 2 of 2
Comments
Metal Mounting Tab
MP821
MP825
MP850
TO-220 Style
TO-126 Style
TO-220 Style
0.020 ?
0.020 ?
0.20 ?
9.99 ?
10.0 K
10.0 K
20 Watts *
25 Watts *
50 Watts *
Power
Limited
300
300
7.50 ° C/Watt
5.00 ° C/Watt
2.50 ° C/Watt
175 ° C
150 ° C
150 ° C
Figure 1
Figure 2
Figure 3
Metal Mounting Tab
Integral Metal Mounting Surface
in Molded Package
Integral Metal Mounting Surface
in Molded Package
100
Derating Curve
Speci?cations:
B
* Derating Using Case Temperature (TC):
80
60
40
20
0
A
25 100 150 175
CASE TEMPERATURE, ° C
A - MP825 / MP850 Max. Temperature, T Max = 150 ° 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 Coef?cient:
TC referenced to +25°C, Δ R 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
B - MP820 / MP821 Max. Temperature, T Max = 175 ° C
The thermal design should satisfy the following equation:
Case Temperature (Tc ) + [Thermal Resistance (R θ JC) x power applied (Watts)] ≤ T MAX considering the full
operating temperature range of the application.
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.
When screw mounting, use a compression washer which provides a mounting force of 150 to 300 pounds
(665 to 1330 N). This will provide suf?cient 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.
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.
Figure 1
Metal Tab
TO-220 Style
MP820 and MP821
Figure 2
TO-126 Style
MP825
.240 ± .010
(6.10 ± .26)
.540 ± .040
(13.72 ± 1.02)
.094 ± .004
(2.39 ± .10) DIA.
.080 ± .020
(2.03 ± .51)
.450 ± .050
(11.43 ± 1.27)
.125 ± .004
(3.18 ± .10) DIA.
.400 ± .010
(10.16 ± .26)
CL
MP820
50.0
1%
.320 ± .010
( 8.1 2 ± .26 )
CL
+
MP825
0.10 ?
1%
.410 ± .010
(10.41 ± .26)
CL
.142 ± .003
(3.61 ± .08) DIA.
.117 ± .003
(2.97 ± .08)
.032 ± .004 DIA.
(.81 ± .10)
.200 ± .010
(5.08 ± .26)
.115 ± .010
(2.92 ± .26)
.053 ± .007
(1.35 ± .18)
.030 ± .004
(.76 ± .10)
.200 ± .010
(5.08 ± .26)
.175 ± .015
(4.45 ± .38)
.052 ± .003
(1.32 ± .08)
.580 ± .010
(14.73 ± .26)
.097 ± .010
(2.46 ± .26)
.110 ± .010
(2.79 ± .26)
.440 ± .010
(11.18 ± .26)
.023 ± .004
(.58 ± .10)
.058 ± .007
(1.47 ± .18)
.125 ± .010
(3.18 ± .26)
Load Stability: 2,000 hours at rated power.
Δ R ±(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.
Δ R ±(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.
Δ R ±(0.3 percent + 0.001 ohm) max.
Moisture Resistance: Mil-Std-202, Method 106.
Δ R ±(0.5 percent + 0.001 ohm) max.
Thermal Shock: Mil-Std-202, Method 107, Cond. F.
Δ R ±(0.3 percent + 0.001 ohm) max.
Shock: 100G, Mil-Std-202, Method 213, Cond. I.
Δ R ±(0.2 percent + 0.001 ohm) max.
Vibration, High Frequency: Mil-Std-202, Method
204, Cond. D. Δ R ±(0.2 percent + 0.001 ohm)
max.
MP850
Figure 3
TO-220 Style
.130 ± .030
(3.30 ± .76)
.500 ± .050
(12.70 ± 1.27)
DIMENSIONS IN INCHES AND (MILLIMETERS)
MP 850
10.0
1%
.125 ± .010
(3.18 ± .26)
.053 ± .007
(1.35 ± .18)
.030 ± .004
(.76 ± .10)
.200 ± .010
(5.08 ± .26)
.640 ± .010
(16.26 ± .26)
.025 ± .004
(.64 ± .10)
.070 ± .010
(1.78 ± .26)
Terminal Strength: Mil-Std-202, Method 211,
Cond. A (Pull Test) 5 lbs. Δ R ±(0.2 percent
+ 0.001 ohm) max.
Terminal Material: Solderable
Measurement Note: For these speci?cations,
resistance measurement shall be made at a point
0.2 inch (5.08 mm) from the resistor body.
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
? 2004 Caddock Electronics, Inc.
e-mail: DOCK
CAD caddock@caddock.com ? web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Sales and Corporate Of?ce
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
28_IL103.1004
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