RHOPOINT COMPONENTS LTD.
Holland Road
Hurst Green
Oxted, Surrey, RH8 9AX
Tel: +44 (0)1883 717988
Fax: +44 (0)1883 712938
Email: components@rhopoint.co.uk
Website: www.rhopoint.co.uk/components/
© 1999 Caddock Electronics, Inc.
CAD KDOC
IL-103.039
TO-126 and TO-220 Style Power Packages - Non-Inductive Designs
MP808 / MP825 (TO-126 style) and MP816 / MP850 (TO-220 style)
Kool-Pak® Power Film Resistors
Use your thermal design experience with power semiconductors in the TO-220 and TO-126 style power package. 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.
Page 1 of 2
Construction of MP808 and MP816:
MP 816
Kool-Pak® Power Resistors
TO-220 Style Power Package
MP808 and MP816 with an All Molded Package Configuration
MP 808
Kool-Pak® Power Resistors
TO -126 Style Power Package
8 Watts at +25°C Case Temperature
derated to zero at +150°C
Thermally Conductive Molded Package
Lower Cost
Resistance Range of 0.020 ohm to 10.0K
Resistor element is electrically isolated from
the mounting surface
16 Watts at +25°C Case Temperature
derated to zero at +150°C
Thermally Conductive Molded Package
Lower Cost
Resistance Range of 0.10 ohm to 10.0K
Resistor element is electrically isolated from
the mounting surface
The MP808 and MP816 Kool-Pak® Power Film Resistors are constructed with Caddock's
Micronox® resistance film fired onto a flat ceramic substrate. The terminal attachment and resistance element geometry are configured to provide
outstanding non-inductive performance. The resistor body is completely surrounded by a high thermal conductivity molding compound to finish this
cost effective power resistor package.
8 Watts
16 Watts
MP 825
Kool-Pak® Power Resistors
TO-126 Style Power Package
The MP825 and MP850 Kool-Pak® Power Film Resistors are constructed with Caddock's
Micronox® resistance film fired onto a flat ceramic substrate. The terminal attachment and resistance element geometry are configured to provide
outstanding non-inductive performance. The ceramic substrate is bonded to a copper heat sink which becomes the metal mounting surface.
This assembly is molded in a high thermal conductivity molding compound with the copper heat sink flush with the back surface of the part.
MP825 and MP850 Power Packages Include an Integral
Metal Mounting Surface for Highly Efficient Thermal Transfer
MP 850
Kool-Pak® Power Resistors
TO-220 Style Power Package
Construction of MP825 and MP850:
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 10.0K
Resistor element is electrically isolated from
the mounting surface
25 Watts
50 Watts
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 10.0K
Resistor element is electrically isolated from
the mounting surface
RHOPOINT COMPONENTS LTD.
Holland Road
Hurst Green
Oxted, Surrey, RH8 9AX
Tel: +44 (0)1883 717988
Tel: +44 (0)1883 717988
Email: components@rhopoint.co.uk
Website: www.rhopoint.co.uk/components/
© 1999 Caddock Electronics, Inc.
CAD KDOC
IL-103.019
TYPICAL TEMPERATURE COEFFICIENT CURVE
(5 and above)
*
25 100 150
CASE TEMPERATURE, C
0
20
40
100
RATED LOAD, %
80
60
o
DERATING CURVE
Temperature Coefficient:
TC referenced to +25°C, R taken at +150°C
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
The case temperature is to be used for purposes of establishing the
maximum applied power. See Derating Curve. The case temperature
measurement is made with the thermocouple contacting the bottom
insulated mounting surface of the package (center of bottom surface), the
device mounted on a heat sink, thermal grease applied at a mounting
torque of up to 8 in-lbs (0.90 N-m) maximum. Without a heat sink, when
in free air at +25°C, the MP808 and the MP825 are rated for 1.25 watts,
the MP816 and the MP850 are rated for 2.25 watts.
Derating ( thermal resistance ) for each model is as follows:
MP808: 0.064 W/°C ( 15.63°C/W )
MP816: 0.128 W/°C ( 7.81°C/W )
MP825: 0.200 W/°C ( 5.00°C/W )
MP850: 0.400 W/°C ( 2.50°C/W )
Mounting Note: The MPKool-Pak® Resistors must be mounted using a
screw and compression washer mounting technique. 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).
1
0
1
% R
55 25 100 150
CASE TEMPERATURE, C
o
Integral Metal Mounting Surface
in Molded Package
0.20
10.0 K
3001,500Figure 2TO-220 Style
50 Watts
*
MP850
Integral Metal Mounting Surface
in Molded Package
0.020
10.0 K
3001,500Figure 1TO-126 Style
25 Watts
*
MP825
Model
No.
Power
Rating
Dielect. Strength
VRMS AC
Min.
Max.
Terminal
Resistance
Max.
Voltage
Package Dimensions
Comments
*
MP808
8 Watts
1,500
0.020
10.0 K
Solderable
300TO-126 Style Figure 1
All Molded Package
0.10
10.0 K
3001,500Figure 2TO-220 Style
16 Watts
*
MP816
All Molded Package
Solderable
Solderable
Solderable
MP816 - 50.0 - 1%
Model Number:
Resistor Value:
Tolerance
Ordering Information:
DIMENSIONS IN INCHES AND (MILLIMETERS)
.640 ±.010
(16.26 ±.26)
.030 ±.004
(.76 ± .10)
.025 ± .004
(.64 ±.10)
.200 ±.010
(5.08 ±.26)
.500 ±.050
(12.70 ±1.27)
.130 ±.030
(3.30 ±.76)
.125 ±.010
(3.18 ±.26)
.410 ±.010
(10.41 ±.26)
MP850
10.0
1%
.125 ±.010
(3.18 ±.26)
.125 ±.004
(3.18 ±.10) DIA.
C
L
.053 ± .007
(1.35 ± .18)
.070 ±.010
(1.78 ±.26)
+
.030 ±.004
(.76 ± .10) .023 ± .004
(.58 ±.10)
.200 ±.010
(5.08 ±.26)
.450 ±.050
(11.43 ±1.27)
.115 ±.010
(2.92 ±.26)
MP808
0.10
1%
.110 ±.010
(2.79 ±.26)
.053 ± .007
(1.35 ± .18)
.058 ±.007
(1.47 ±.18)
.320 ±.010
(8.12 ±.26)
.094 ±.004
(2.39 ±.10) DIA.
C
L
.440 ±.010
(11.18 ±.26)
.080 ±.020
(2.03 ±.51)
Figure 1
TO-126 Style
MP808, MP825
Figure 2
TO-220 Style
MP816, MP850
Specifications:
ResistanceTolerance: ±1% for 0.050 up to10.0k,
±5% for 0.020 up to 0.049 (0.5%, 2%,5%,10%
and 20% are available for most resistance values).
Insulation Resistance: 10,000 Megohms, min.
The resistor element is electrically isolated from
the mounting surface.
Terminal Strength: Mil-Std-202, Method 211,
Cond. A (Pull Test) 5 lbs.
MP808, MP816, MP825:
R ±(0.2 percent + 0.001 ohm) max.
MP850:
R ±(0.2 percent + 0.01 ohm) max.
Thermal Shock: Mil-Std-202, Method 107, Cond. F.
MP808, MP816, MP825:
R ±(0.3 percent + 0.001 ohm) max.
MP850:
R ±(0.3 percent + 0.01 ohm) max.
Momentary Overload:
MP816 and MP850: 2 times rated power with
applied voltage not to exceed 1.5 times maximum
continuous operating voltage for 5 seconds.
MP816:
R ±(0.3 percent + 0.001 ohm) max.
MP850:
R ±(0.3 percent + 0.01 ohm) max.
MP808 and MP825: 1.5 times rated power with
applied voltage not to exceed 1.5 times maximum
continuous operating voltage for 5 seconds.
MP808, MP825:
R ±(0.3 percent + 0.001 ohm) max.
Moisture Resistance: Mil-Std-202, Method 106.
MP808, MP816, MP825:
R ±(0.5 percent + 0.001 ohm) max.
MP850:
R ±(0.5 percent + 0.01 ohm) max.
Load Life: 2,000 hours at rated power. Power
rating dependent upon case temperature. See
derating curve.
MP808, MP816, MP825:
R ±(1.0 percent + 0.001 ohm) max.
MP850:
R ±(1.0 percent + 0.01 ohm) max.
Shock: 100G, Mil-Std-202, Method 213, Cond. I.
MP808, MP816, MP825:
R ±(0.2 percent + 0.001 ohm) max.
MP850:
R ±(0.2 percent + 0.01 ohm) max.
Vibration, High Frequency: Mil-Std-202,
Method 204, Cond. D.
MP808, MP816, MP825:
R ±(0.2 percent + 0.001 ohm) max.
MP850:
R ±(0.2 percent + 0.01 ohm) max.
Measurement Note: For these specifications,
resistance measurement shall be made at a
point 0.2 inch (5.08 mm) from the resistor body.
MP808 / MP825 (TO-126 style) and MP816 / MP850 (TO-220 style)
Kool-Pak® Power Film Resistors Page 2 of 2