Sales and Corporate Office 1717 Chicago Avenue Riverside, California 92507-2364 Phone: (951) 788-1700 Fax: (951) 369-1151 Applications Engineering 17271 North Umpqua Hwy. Roseburg, Oregon 97470-9422 Phone: (541) 496-0700 Fax: (541) 496-0408 e-mail: • web: www.caddock.com For Caddock Distributors listed by country see caddock.com/contact/dist.html © 2004 Caddock Electronics, Inc. CAD K DOC • 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. MP825 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 ceramic substrate is bonded to a copper heat sink which becomes the metal mounting surface. This assembly is molded with the copper heat sink flush with the back surface of the part. The terminal attachment and resistance element geometry are configured to provide outstanding non-inductive performance. MP825 and MP850 Power Film Resistors Include an Integral Metal Mounting Surface for Highly Efficient Thermal Transfer Certain products shown in this catalog are covered by one or more patents, there are also patents pending. MP800 Series Kool-Pak ® Power Film Resistors TO-220 Style and TO-126 Style - Non-Inductive Designs • 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. MP820 and MP821 TO-220 Style Power Package with Metal Mounting Tab 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. MP850 - 50.0 - 1% Model Number: Resistor Value: Tolerance The MP820 and MP821 Kool-Tab ® Power Film Resistors are constructed with Caddock's Micronox® resistance film fired onto a flat 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 finish the metal tab TO-220 package. The lead wire attachment and resistance element geometry are configured to provide outstanding non-inductive performance. For custom resistance values and tolerances contact applications engineering MP825 Standard 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 Tolerance MP825: ±1% standard (except as noted), (0.5%, 2%, 5%,10%, and 20% are available for most resistance values). 0.30 Ω 0.33 Ω 0.40 Ω 0.50 Ω 0.75 Ω 1.00 Ω 1.50 Ω 2.00 Ω 2.50 Ω 3.00 Ω 3.30 Ω 4.00 Ω 5.00 Ω 7.50 Ω 8.00 Ω 10.0 Ω 12.0 Ω 15.0 Ω 20.0 Ω 25.0 Ω 27.0 Ω 30.0 Ω 33.0 Ω 40.0 Ω 47.0 Ω 50.0 Ω 56.0 Ω 75.0 Ω 100 Ω 120 Ω 150 Ω 200 Ω 250 Ω 300 Ω 330 Ω 400 Ω 470 Ω 500 Ω 560 Ω 750 Ω 1.00 K 1.50 K 2.00 K 2.50 K 3.00 K 3.30 K 4.00 K 5.00 K 7.50 K 10.0 K MP850 Standard 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 2.00 Ω 2.50 Ω 3.00 Ω 3.30 Ω 4.00 Ω 5.00 Ω 7.50 Ω 8.00 Ω 10.0 Ω 12.0 Ω 15.0 Ω 20.0 Ω 25.0 Ω 27.0 Ω 30.0 Ω 33.0 Ω 40.0 Ω 47.0 Ω 50.0 Ω 56.0 Ω 75.0 Ω 100 Ω 120 Ω 150 Ω 200 Ω 250 Ω 300 Ω 330 Ω 400 Ω 470 Ω 500 Ω 560 Ω 750 Ω 1.00 K 1.50 K 2.00 K Tolerance MP850: ±1% standard, (0.5%, 2%, 5%,10%, and 20% are available for most resistance values). 2.50 K 3.00 K 3.30 K 4.00 K 5.00 K 7.50 K 10.0 K • 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. Construction of MP825 and MP850: Ordering Information: Construction of MP820 and MP821: MP850 TO-220 Style Power Package MP821 Standard Resistance Values: 0.020 Ω 0.025 Ω 0.030 Ω 0.033 Ω 0.040 Ω Tolerance MP821: ±1% Standard (0.5%, 2%, 5%, 10%, and 20% are available for most resistance values). 0.050 Ω 0.075 Ω 0.10 Ω 0.15 Ω 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 2.00 Ω 2.50 Ω 3.00 Ω 3.30 Ω 4.00 Ω 5.00 Ω 7.50 Ω 8.00 Ω MP820 Standard Resistance Values: 10.0 Ω 12.0 Ω 15.0 Ω 20.0 Ω 25.0 Ω 27.0 Ω Tolerance MP820: ±1% Standard (0.5%, 2%, 5%, 10%, and 20% are available for most resistance values). 30.0 Ω 33.0 Ω 40.0 Ω 47.0 Ω 50.0 Ω 56.0 Ω 75.0 Ω 100 Ω 120 Ω 150 Ω 200 Ω 250 Ω 300 Ω 330 Ω 400 Ω 470 Ω 500 Ω 560 Ω 750 Ω 1.00 K 1.50 K 2.00 K 2.50 K 3.00 K 3.30 K 4.00 K 5.00 K 7.50 K 10.0 K Packaging: MP800 Series Resistors are packaged in plastic shipping tubes, 50 pieces per tube when the order quantity permits. Page 1 of 2 28_IL103.1004Sales and Corporate Office 1717 Chicago Avenue Riverside, California 92507-2364 Phone: (951) 788-1700 Fax: (951) 369-1151 Applications Engineering 17271 North Umpqua Hwy. Roseburg, Oregon 97470-9422 Phone: (541) 496-0700 Fax: (541) 496-0408 e-mail: • web: www.caddock.com For Caddock Distributors listed by country see caddock.com/contact/dist.html © 2004 Caddock Electronics, Inc. CAD K DOC 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. CL .053 ± .007 (1.35 ± .18) .070 ±.010 (1.78 ±.26) Figure 2 TO-126 Style MP825 Figure 1 Metal Tab TO-220 Style MP820 and MP821 MP820 50.0 1% .540 ±.040 (13.72 ±1.02) CL .117 ±.003 (2.97 ±.08) .240 ±.010 (6.10 ±.26) .400 ±.010 (10.16 ±.26) .200 ±.010 (5.08 ±.26) .032 ± .004 DIA. (.81 ± .10) .175 ±.015 (4.45 ±.38) .052 ±.003 (1.32 ±.08) .580 ±.010 (14.73 ±.26) .097 ±.010 (2.46 ±.26) .142 ±.003 (3.61 ±.08) DIA. Figure 3 TO-220 Style MP850 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. The thermal design should satisfy the following equation: Case Temperature (T c ) + [Thermal Resistance (RθJC) x power applied (Watts)] ≤ TMAX considering the full operating temperature range of the application. Mounting Note: Mount on a smooth, clean and flat 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 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). 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. * Derating Using Case Temperature (TC): Derating Curve MP821 MP820 Model No. Comments Integral Metal Mounting Surface in Molded Package MP850 Integral Metal Mounting Surface in Molded Package MP825 Metal Mounting Tab TO-220 Style Metal Mounting Tab TO-220 Style Package TO-220 Style TO-126 Style 0.020 Ω 9.99 Ω 10.0 Ω 10.0 K Min. Max. Resistance 0.20 Ω 10.0 K 0.020 Ω 10.0 K 20 Watts* 20 Watts* Power Rating 50 Watts* 25 Watts* Max. Voltage Power Limited 300 300 300 Thermal Resistance RθJC Film (J) to Case (C) 7.50°C/Watt 5.00°C/Watt 2.50°C/Watt 7.50°C/Watt 175°C Figure 1 Figure 1 Dimensions Figure 3 Figure 2 Max. Temp. T MAX 175°C 150°C 150°C + .030 ±.004 (.76 ± .10) .023 ± .004 (.58 ±.10) .200 ±.010 (5.08 ±.26) .450 ±.050 (11.43 ±1.27) .115 ±.010 (2.92 ±.26) MP825 0.10 Ω 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. CL .440 ±.010 (11.18 ±.26) .080 ±.020 (2.03 ±.51) Specifications: Temperature Coefficient: TC referenced to +25°C, ΔR taken at TMAX 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 Operating Temperature: -55°C to TMAX Inductance: 10nH typical in series when measured at a point 0.2 inches from the resistor body. DWV: The dielectric strength rating of 1500 VrmsAC 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. Load Stability: 2,000 hours at rated power. ΔR ±(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. ΔR ±(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. ΔR ±(0.3 percent + 0.001 ohm) max. Moisture Resistance: Mil-Std-202, Method 106. ΔR ±(0.5 percent + 0.001 ohm) max. Thermal Shock: Mil-Std-202, Method 107, Cond. F. ΔR ±(0.3 percent + 0.001 ohm) max. Shock: 100G, Mil-Std-202, Method 213, Cond. I. ΔR ±(0.2 percent + 0.001 ohm) max. Vibration, High Frequency: Mil-Std-202, Method 204, Cond. D. ΔR ±(0.2 percent + 0.001 ohm) max. Terminal Strength: Mil-Std-202, Method 211, Cond. A (Pull Test) 5 lbs. ΔR ±(0.2 percent + 0.001 ohm) max. Terminal Material: Solderable Measurement Note: For these specifications, resistance measurement shall be made at a point 0.2 inch (5.08 mm) from the resistor body. 100 175 0 20 40 100 POWER RATING, % 80 60 150 A B 25 A - MP825 / MP850 Max. Temperature, TMax = 150°C B - MP820 / MP821 Max. Temperature, TMax = 175°C CASE TEMPERATURE, °C Page 2 of 2 28_IL103.1004

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