MP808 / MP825 (TO-126 style) and MP816 / MP850 (TO-220 style)
Kool-Pak
®
Power Film Resistors
Page 1 of 2
TO-126 and TO-220 Style Power Packages - Non-Inductive Designs
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.
MP825 and MP850 Power Packages Include an Integral
Metal Mounting Surface for Highly Efficient Thermal Transfer
MP 825 Kool-Pak
®
Power Resistors
TO-126 Style Power Package
•
•
•
•
25 W
atts
MP 850 Kool-Pak
®
Power Resistors
TO-220 Style Power Package
•
•
•
•
50 W
atts
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
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
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.
Construction of MP825 and MP850:
MP808 and MP816 with an All Molded Package Configuration
8W
atts
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 W
atts
MP 816 Kool-Pak
®
Power Resistors
TO-220 Style Power Package
•
•
•
•
•
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.
Construction of MP808 and MP816:
RHOPOINT COMPONENTS LTD.
Holland Road
Hurst Green
Oxted, Surrey, RH8 9AX
© 1999 Caddock Electronics, Inc.
CADDOCK
Tel: +44 (0)1883 717988
Fax: +44 (0)1883 712938
Email:
components@rhopoint.co.uk
Website:
www.rhopoint.co.uk/components/
IL-103.039
MP808 / MP825 (TO-126 style) and MP816 / MP850 (TO-220 style)
Kool-Pak
®
Power Film Resistors
Model
No.
MP 808
MP 816
Page 2 of 2
Power
Rating
Package
TO-126 Style
TO-220 Style
Dimensions
Figure 1
Figure 2
Dielect. Strength
VRMS AC
1,500
1,500
Max.
Voltage
300
300
Resistance
Min.
Max.
0.020
Ω
0.10
Ω
10.0 K
10.0 K
Terminal
Solderable
Solderable
Solderable
Solderable
Comments
All Molded Package
All Molded Package
MP 825
MP 850
*
16 Watts
*
25 Watts
*
50 Watts
*
8 Watts
TO-126 Style
TO-220 Style
Figure 1
Figure 2
1,500
1,500
300
300
0.020
Ω
0.20
Ω
10.0 K
10.0 K
Integral Metal Mounting Surface
in Molded Package
Integral Metal Mounting Surface
in Molded Package
TYPICAL TEMPERATURE COEFFICIENT CURVE
(5
Ω
and above)
Specifications:
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
ResistanceTolerance:
±1%
for 0.050Ω up to10.0kΩ,
±5%
for 0.020Ω up to 0.049Ω (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.
1
%
∆
R
0
1
55
25
100
o
150
CASE TEMPERATURE, C
be
establishing the
*
The case temperature is toSee used for purposes of
case temperature
maximum applied power.
Derating Curve.
The
DERATING CURVE
100
80
RATED LOAD, %
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
MP808: 0.064 W/°C
MP816: 0.128 W/°C
MP825: 0.200 W/°C
MP850: 0.400 W/°C
model is as follows:
( 15.63°C/W )
( 7.81°C/W )
( 5.00°C/W )
( 2.50°C/W )
60
40
20
0
25
100
o
150
CASE TEMPERATURE, C
Mounting Note:
The MP Kool-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).
.094
±.004
(2.39
±.10)
DIA.
Figure 1
TO-126 Style
MP808, MP825
.320
±.010
(8.12
±.26)
C
L
+
.110
±.010
(2.79
±.26)
.080
±.020
(2.03
±.51)
MP808
0.10
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)
Figure 2
TO-220 Style
MP816, MP850
.125
±.004
(3.18
±.10)
DIA.
.410
±.010
(10.41
±.26)
C
L
.125
±.010
(3.18
±.26)
.125
±.010
(3.18
±.26)
.130
±.030
(3.30
±.76)
MP850
10.0
1%
.053
±
.007
(1.35
±
.18)
.030
±.004
(.76
±
.10)
.200
±.010
(5.08
±.26)
.640
±.010
(16.26
±.26)
.500
±.050
(12.70
±1.27)
.025
±
.004
(.64
±.10)
.070
±.010
(1.78
±.26)
DIMENSIONS IN INCHES AND (MILLIMETERS)
Ordering Information
:
Model Number:
Resistor Value:
MP816 - 50.0 - 1%
Tolerance
RHOPOINT COMPONENTS LTD.
Holland Road
Hurst Green
Oxted, Surrey, RH8 9AX
© 1999 Caddock Electronics, Inc.
CADDOCK
Tel: +44 (0)1883 717988
Tel: +44 (0)1883 717988
Email:
components@rhopoint.co.uk
Website:
www.rhopoint.co.uk/components/
IL-103.019
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