Product Overview
The Caddock Type MS Power Film Resistors offer a wide resistance range and a maximum operating temperature of +275C, with power ratings up to 22 Watts and voltage ratings as high as 6,000 volts. These axial-lead resistors simplify circuit design and reduce equipment cost and complexity by providing full power and voltage ratings without derating, high resistance values, and higher voltage ratings without minimum wire size and spacing limitations. They feature excellent long-term stability, with typical stability of 0.05% per 1,000 hours. The resistors utilize Caddock's proprietary Micronox complex metal oxide resistance films, fired onto a ceramic core, ensuring outstanding stability under high ambient temperatures, thermal shock, and high power densities. The patented non-inductive serpentine resistive pattern minimizes flux field cancellation for efficient non-inductive performance, crucial for high-frequency circuits. Manufactured under intensive controls including power, overvoltage, and maximum temperature conditioning, and produced under procedures approved for conformance to Mil-I-45208.
Product Attributes
- Brand: Caddock
- Product Family: Type MS Power Film Resistors
- Resistance Film: Micronox complex metal oxide
- Core Material: High strength solid ceramic
- End Caps: Nickel alloy
- Lead Material: Nickel Clad Copper with thin Gold Plate (solderable); optional pure nickel leads available for welding on specific models (MS126, MS150, MS151, MS175, MS176, MS210)
- Encapsulation: High Temperature Silicone Conformal
- Certifications: Conformance to Mil-I-45208 approved procedures; included in Caddock Reliability Testing Program (Extended Life, Shock, Vibration, Humidity verification)
Technical Specifications
| Model No. | Rated Power (Watts at +125C) | Rated Power (Watts at +25C) | Resistance Min. | Resistance Max. | Max. Voltage (Volts) | Dielectric Strength (Volts) | Dimensions (B) inches (mm) | Dimensions (A) inches (mm) | Dimensions (C) inches (mm) |
|---|---|---|---|---|---|---|---|---|---|
| MS126 | 0.25 | 0.50 | 20 | 1 Meg | 200 | 500 | .070 .015 (1.78 .38) | .188 .020 (4.78 .51) | .020 .002 (.51 .05) |
| MS150 | 0.30 | 0.60 | 20 | 2 K | 500 | 500 | .070 .015 (1.78 .38) | .188 .020 (4.78 .51) | .020 .002 (.51 .05) |
| MS151 | 0.45 | 0.75 | 20 | 2 Meg | 300 | 750 | .094 .015 (2.39 .38) | .250 .020 (6.35 .51) | .025 .002 (.64 .05) |
| MS175 | 0.45 | 0.75 | 20 | 2 K | 750 | 750 | .094 .015 (2.39 .38) | .250 .020 (6.35 .51) | .025 .002 (.64 .05) |
| MS176 | 0.60 | 1.2 | 45 | 5 Meg | 500 | 750 | .094 .015 (2.39 .38) | .313 .020 (7.95 .51) | .025 .002 (.64 .05) |
| MS210 | 0.60 | 1.8 | 45 | 3 K | 500 | 750 | .109 .025 (2.77 .64) | .313 .030 (7.95 .76) | .025 .002 (.64 .05) |
| MS214 | 0.60 | 1.8 | 45 | 5 Meg | 500 | 750 | .140 .030 (3.56 .76) | .400 .060 (10.16 1.52) | .025 .002 (.64 .05) |
| MS220 | 1.2 | 2.4 | 20 | 10 Meg | 1,000 | 800 | .165 .030 (4.19 .76) | .575 .050 (14.61 1.27) | .032 .002 (.81 .05) |
| MS221 | 1.8 | 2.4 | 45 | 10 Meg | 1,000 | 800 | .230 .030 (5.84 .76) | .480 .060 (12.19 1.52) | .040 .002 (1.02 .05) |
| MS223 | 1.8 | 3.6 | 20 | 4 Meg | 800 | 1,000 | .230 .030 (5.84 .76) | .950 .060 (24.13 1.52) | .040 .002 (1.02 .05) |
| MS244 | 2.4 | 4.8 | 45 | 15 Meg | 2,000 | 1,000 | .300 .030 (7.62 .76) | .570 .060 (14.48 1.52) | .040 .002 (1.02 .05) |
| MS245 | 2.4 | 3.6 | 20 | 6 Meg | 800 | 1,000 | .300 .030 (7.62 .76) | .970 .060 (24.64 1.52) | .040 .002 (1.02 .05) |
| MS260 | 3.6 | 6.0 | 45 | 15 Meg | 2,000 | 1,000 | .350 .040 (8.89 1.02) | .910 .060 (23.11 1.52) | .040 .002 (1.02 .05) |
| MS281 | 4.8 | 7.5 | 45 | 8 Meg | 2,000 | 1,000 | .350 .040 (8.89 1.02) | 1.250 .070 (31.75 1.78) | .040 .002 (1.02 .05) |
| MS310 | 6.0 | 9.0 | 45 | 20 Meg | 4,500 | 1,000 | .350 .040 (8.89 1.02) | 2.000 .080 (50.80 2.03) | .040 .002 (1.02 .05) |
| MS313 | 7.5 | 13.2 | 50 | 30 Meg | 6,000 | 1,000 | .350 .040 (8.89 1.02) | 2.000 .080 (50.80 2.03) | .040 .002 (1.02 .05) |
| MS315 | 9.0 | * | 50 | 1 Meg | 1,000 | 1,000 | .350 .040 (8.89 1.02) | 3.000 .090 (76.20 2.29) | .040 .002 (1.02 .05) |
| MS322 | * | 22.0 | 100 | 1.5 Meg | 1,000 | 1,000 | .350 .040 (8.89 1.02) | * | .040 .002 (1.02 .05) |
| Specification | Value |
|---|---|
| Resistance Tolerance | 1% (tolerances to 0.1% on special order) |
| Temperature Coefficient | 50 ppm/C (referenced to +25C, R taken at -15C and +105C) |
| Insulation Resistance | 10,000 Megohms, min. |
| Overload/Overvoltage | 5 times rated power with applied voltage not to exceed 1.5 times maximum continuous operating voltage for 5 seconds. R 0.5% max. or 0.5 ohm max., whichever is greater. |
| Thermal Shock | Mil-Std-202, Method 107, Cond. C, R 0.5% max. or 0.5 ohm max., whichever is greater. |
| Moisture Resistance | Mil-Std-202, Method 106, R 0.5% max. or 0.5 ohm max., whichever is greater. |
| Load Life | 1,000 hours at rated power at +25C or +125C (see derating curve), not to exceed rated voltage, R 0.5% max. or 0.5 ohm max., whichever is greater. Mounting method per Mil-R-39007, para. 4.7.2 "conditioning". |
| Maximum Operating Temperature | +275C |
| Derating Curve Type A | All MS models except MS126, MS151, MS176 |
| Derating Curve Type B | MS126, MS151, MS176 |
2411181757_Caddock-MS310-1-00M-1-_C20483406.pdf
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