MP850-4.00-0.5% - Caddock Electronics, Inc.

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/

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

Email: components@rhopoint.co.uk

Website: www.rhopoint.co.uk/components/

CAD KDOC

IL-103.019

TYPICAL TEMPERATURE COEFFICIENT CURVE

(5 Ω and above)

25 100 150

CASE TEMPERATURE, C

100

RATED LOAD, %

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).

% R

55 25 100 150

CASE TEMPERATURE, C

∆

Integral Metal Mounting Surface

in Molded Package

0.20 Ω

10.0 K

3001,500Figure 2TO-220 Style

50 Watts

MP850

Integral Metal Mounting Surface

in Molded Package

0.020 Ω

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 Ω

10.0 K

Solderable

300TO-126 Style Figure 1

All Molded Package

0.10 Ω

10.0 K

3001,500Figure 2TO-220 Style

16 Watts

MP816

All Molded Package

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

.125 ±.010

(3.18 ±.26)

.125 ±.004

(3.18 ±.10) DIA.

.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

.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.

.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 0.050Ω 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.

MP808 / MP825 (TO-126 style) and MP816 / MP850 (TO-220 style)

Kool-Pak® Power Film Resistors Page 2 of 2