Current Sense Resistors:MP820/MP821
2Pages

MP800 Series Kool-Pak® Power Film Resistors TO-220 Style and TO-126 Style - Non-Inductive Designs 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. Construction of MP820 and MP821: The MP820 and MP821 Kool-Tab® Power Film Resistors are constructed with Caddock's Micronox® resistance lm red onto a at 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 nish the metal tab TO-220 package. The lead wire attachment and resistance element geometry are congured to provide outstanding non-inductive performance. MP825 and MP850 Power Film Resistors Include an Integral Metal Mounting Surface for Highly Efcient Thermal Transfer MP821 Standard Resistance Values: Tolerance MP821: ±1% Standard (0.5%, 2%, 5%, 10%, and 20% are available for most resistance values). 0.020 Ω 0.025 Ω 0.030 Ω 0.033 Ω 0.040 Ω MP820 Standard Resistance Values: Tolerance MP820: ±1% Standard (0.5%, 2%, 5%, 10%, and 20% are available for most resistance values). 10.0 Ω 12.0 Ω 15.0 Ω 20.0 Ω 25.0 Ω 27.0 Ω 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. MP850 TO-220 Style Power Package • • • • • 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. The MP825 and MP850 Kool-Pak® Power Film Resistors are constructed with Caddock's Micronox® resistance lm red onto a at 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 ush with the back surface of the part. The terminal attachment and resistance element geometry are congured to provide outstanding non-inductive performance. Ordering Information: Model Number: 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. Tolerance MP825: ±1% standard (except as noted), (0.5%, 2%, 5%,10%, and 20% are available for most 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 MP850 Standard Resistance Values: Resistor Value: Applications Engineering 17271 North Umpqua Hwy. Roseburg, Oregon 97470-9422 Phone: (541) 496-0700 Fax: (541) 496-0408 MP825 Standard Resistance Values: Tolerance MP850: ±1% standard, (0.5%, 2%, 5%,10%, and 20% are available for most resistance values). 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 e-mail: caddock@caddock.com • web: www.caddock.com For Caddock Distributors listed by country see caddock.com/contact/dist.html Sales and Corporate Ofce 1717 Chicago Avenue Riverside, California 92507-2364 Phone: (951) 788-1700 Fax: (951) 369-1151 28_IL103.1004

Thermal Resistance RθJC Film (J) to Case (C) Comments Metal Mounting Tab Power Rating 20 Watts* Power Limited Integral Metal Mounting Surface in Molded Package Integral Metal Mounting Surface in Molded Package Derating Curve POWER RATING, % * Derating Using Case Temperature (TC): CASE TEMPERATURE, °C A - MP825 / MP850 Max. Temperature, TMax = 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....