Type MS Power Film Resistors Page 1 of 2 Power Film Resistor Family with Wide Resistance Range and +275C Maximum Temperature With power ratings to 22 Watts and voltage ratings as high as 6,000 volts in an axial-lead resistor with values to 30 Megohms, the Type MS Power Film Resistors deliver the performance capabilities that can simplify circuit design and reduce equipment cost and complexity. Type MS Power Film Resistors provide all these features in a single resistor: Full power and voltage ratings, without derating: - for non-inductive performance. - for high resistance values that extend the critical resistance value up to 10 times. Higher voltage ratings without the limitations of minimum wire size and spacing. Excellent long-term stability. Tests demonstrate typical stability of 0.05% per 1,000 Caddock s hours over extended life. Non-Inductive Design N Micronox Resistance Films Type MS performance begins with Caddock s Micronox complex metal oxide resistance lms. Produced exclusively by Caddock Electronics, these proven complex oxide lms The Serpentine Pattern used in this patented product have been used reliably for over 30 years in Caddock s contain features which enhance high stability in precision power resistor products. High-Power Resistor applications. Micronox resistance films are fired directly onto a Most models are manufactured with Caddock s ceramic core at temperatures above 1400F (760C). These Non-Inductive serpentine resistive pattern that provides for resistance films have demonstrated outstanding stability neighboring lines to carry current in opposite directions, when exposed to a high ambient temperature, thermal shock thereby achieving maximum cancellation of ux elds over and high power densities. the entire length of the resistor. This ef cient non-inductive This unique approach to precision power resistors opens construction is accomplished without derating of any new design possibilities by providing a wider resistance performance advantages. range, precise temperature characteristics, and higher The result is a truly non-inductive resistor that is about as temperature and power handling capability. inductive as a straight piece of wire the length of the resistor body. This ef cient design means faster settling times and minimum distortion in all types of high frequency circuits. Carefully Controlled Manufacturing and Test Procedures Assure Compliance with Strict Quality Control Requirements. Manufacturing Control Reliability Veri cation Type MS Resistors are produced under intensive Type MS resistors are included in the Caddock Reliability manufacturing controls with processes which include power Testing Program. Conformance to speci cation parameters conditioning, overvoltage conditioning, and maximum including Extended Life, Shock, Vibration, and Humidity are temperature conditioning. veri ed on a periodic basis. Data from Type MS resistors can be compared by similarity to other Caddock resistor types, since Type ML, MM, MS, MP, MG, and MK represent Quality Control an identical combination of materials - aluminum oxide From the certi cation and testing of all materials, to the substrate, Micronox resistance lm, and silicone insulating su per vi sion of manufacturing processes, all Caddock Type coating. MS Power Film Resistors are produced under pro ce dures that have been approved for conformance to the requirements of Mil-I-45208 in many recent surveys as described on page 8. Certain products shown in this catalog are covered by one or more patents, there are also patents pending. Sales and Applications Engineering 17271 North Umpqua Hwy. ELECTRONICS, INC. Roseburg, Oregon 97470-9422 website: caddock.com Phone: (541) 496-0700 For Caddock Distributors listed by country see caddock.com/contact/dist.html email: caddock caddock.com 2003-2021 Caddock Electronics, Inc. 28 IL108.0321Type MS Power Film Resistors Page 2 of 2 MS126, MS150 MS151, MS175 MS176, MS210 MS214 MS220 MS221 MS223 Construction:Construction: The The TType MS ype MS Power Power MS244 FilmFilm ResistorResistoris is constructedconstructed with Micronoxwith Micronox resistance resistance lms lms bonded to a high strength solid MS245 ceramic core. Nickel alloy end caps and axial leads complete the assembly. Encapsulation is provided by a high MS260 temperature silicone conformal coating. Type MS: Lead material is Nickel Clad Copper with thin Gold Plate, solderable. MS281 For welding applications, optional pure nickel leads are available on Models MS126, MS150, MS151, MS175, MS176, MS210. Contact MS310 Caddock Applications Engineering. MS313, MS315 MS322 Resistance Dimensions in inches and (millimeters) Watt- Watt- Speci cations: Model Max. Dielect. age at age at No. Voltage Strength Min. Max. A B C +25C +125C Resistance Tolerance: 1% (tolerances to 0.1% on .188 .020 .070 .015 .020 .002 MS126 0.25 0.25 200 500 1 Meg special order). 20 (4.78 .51) (1.78 .38) (.51 .05) .188 .020 .070 .015 .020 .002 Temperature Coef cient: 50 ppm/C. TC referenced MS150 0.50 0.30 500 2 K 20 (4.78 .51) (1.78 .38) (.51 .05) * to +25C, R taken at -15C and +105C250 .020 .094 .015 .025 .002 MS151 0.50 0.50 300 750 2 Meg 20 (6.35 .51) (2.39 .38) (.64 .05) Insulation Resistance: 10,000 Megohms, min250 .020 .094 .015 .025 .002 MS175 0.75 0.45 750 2 K 20 (6.35 .51) (2.39 .38) (.64 .05) * Overload/Overvoltage: 5 times rated power with applied .313 .020 .094 .015 .025 .002 MS176 0.75 0.75 500 750 5 Meg 45 voltage not to exceed 1.5 times maximum continuous oper- (7.95 .51) (2.39 .38) (.64 .05) .313 .020 .094 .015 .025 .002 ating voltage for 5 seconds. R 0.5% max. or 0.5 ohm MS210 1.0 0.60 750 3 K 45 (7.95 .51) (2.39 .38) (.64 .05) * max., whichever is greater313 .030 .109 .025 .025 .002 MS214 1.0 0.60 500 750 5 Meg 45 (7.95 .76) (2.77 .64) (.64 .05) Thermal Shock: Mil-Std-202, Method 107, Cond. C, R .400 .060 .140 .030 .025 .002 MS220 2.0 1.2 1,000 800 20 10 Meg (10.16 1.52) (3.56 .76) (.64 .05) 0.5% max. or 0.5 ohm max., whichever is greater575 .050 .165 .030 .032 .002 MS221 3.0 1.8 1,000 800 45 10 Meg Moisture Resistance: Mil-Std-202, Method 106, R 0.5% (14.61 1.27) (4.19 .76) (.81 .05) .480 .060 .230 .030 .040 .002 max. or 0.5 ohm max., whichever is greater. MS223 3.0 1.8 800 1,000 4 Meg 20 (12.19 1.52) (5.84 .76) (1.02 .05) Load Life: 1,000 hours at rated power at +25C or .950 .060 .230 .030 .040 .002 MS244 4.0 2.4 2,000 1,000 15 Meg 45 (24.13 1.52) (5.84 .76) (1.02 .05) +125C (see derating curve), not to exceed rated .570 .060 .300 .030 .040 .002 MS245 4.0 2.4 800 1,000 6 Meg 20 voltage, R 0.5% max. or 0.5 ohm max., whichever is (14.48 1.52) (7.62 .76) (1.02 .05) .970 .060 .300 .030 .040 .002 greater. Mounting method per Mil-R-39007, para. 4.7.2 MS260 6.0 3.6 2,000 1,000 15 Meg 45 (24.64 1.52) (7.62 .76) (1.02 .05)conditionin910 .060 .350 .040 .040 .002 MS281 8.0 4.8 2,000 1,000 8 Meg 45 (23.11 1.52) (8.89 1.02) (1.02 .05) Maximum Operating Temperature: +275C. 1.250 .070 .350 .040 .040 .002 MS310 10.0 6.0 4,500 1,000 20 Meg 45 (31.75 1.78) (8.89 1.02) (1.02 .05) Encapsulation: High Temperature Silicone Conformal. 2.000 .080 .350 .040 .040 .002 MS313 12.5 7.5 6,000 1,000 30 Meg 50 (50.80 2.03) (8.89 1.02) (1.02 .05) B 2.000 .080 .350 .040 .040 .002 A 1.500 .125 C MS315 15.0 9.0 1,000 50 1 Meg (50.80 2.03) (8.89 1.02) (1.02 .05) * (38.10 3.18) 3.000 .090 .350 .040 .040 .002 MS322 22.0 13.2 1,000 1.5 Meg 100 (76.20 2.29) (8.89 1.02) (1.02 .05) * Limited by power rating. DIMENSIONS IN INCHES AND (MILLIMETERS) * Models with low inductance construction are in shaded areas. 100 Derating Curve: A - all MS models Models with Caddock s Non-Inductive Resistance Pattern are in non-shaded areas. 80 except MS126, B A 60 RATED POWER OR MS151, MS176 Ordering Information: RATED VOLTAGE, % 40 MS220 -100K - 1% B - MS126, MS151, 20 MS176 Model Number: Tolerance 0 25 75 125 175 225 275 Resistor Value: AMBIENT TEMPERATURE, C Sales and Applications Engineering 17271 North Umpqua Hwy. ELECTRONICS, INC. Roseburg, Oregon 97470-9422 website: caddock.com Phone: (541) 496-0700 For Caddock Distributors listed by country see caddock.com/contact/dist.html email: caddock caddock.com 2003-2021 Caddock Electronics, Inc. 28 IL108.0321