Product Overview
The Caddock Type MS Power Film Resistors are high-performance axial-lead resistors designed for demanding applications requiring a wide resistance range and high temperature operation up to +275C. These resistors offer power ratings up to 22 Watts and voltage ratings as high as 6,000 volts, with resistance values extending to 30 Megohms. Key advantages include full power and voltage ratings without derating, non-inductive performance, high stability, and enhanced voltage handling capabilities. Built with Caddock's proprietary Micronox resistance films fired onto a ceramic core, they provide excellent long-term stability (0.05% per 1,000 hours) and are manufactured under intensive controls, including power, overvoltage, and maximum temperature conditioning. Their patented serpentine pattern ensures efficient non-inductive construction, leading to faster settling times and minimal distortion in high-frequency circuits. These resistors are suitable for applications where circuit design simplification, reduced equipment cost, and complexity are desired.
Product Attributes
- Brand: Caddock Electronics, Inc.
- Resistance Film: Micronox
- 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 applications on specific models.
- Encapsulation: High Temperature Silicone Conformal
- Certifications/Approvals: Manufacturing processes approved for conformance to Mil-I-45208 requirements. Included in Caddock Reliability Testing Program.
- Origin: USA
Technical Specifications
| Model No. | Rated Power (Watts) at +125C | Rated Power (Watts) at +25C | Max. Voltage (Volts) | Resistance Min. () | Resistance Max. () | Dielectric Strength (Volts) | Dimensions (inches tolerance) | Dimensions (mm tolerance) |
|---|---|---|---|---|---|---|---|---|
| MS126 | 0.25 | 0.50 | 500 | 20 | 1 Meg | 200 | A: .020 .002 B: .070 .015 C: .188 .020 | A: (.51 .05) B: (1.78 .38) C: (4.78 .51) |
| MS150 | 0.30 | 0.60 | 500 | 20 | 2 K | 300 | A: .020 .002 B: .070 .015 C: .188 .020 | A: (.51 .05) B: (1.78 .38) C: (4.78 .51) |
| MS151 | 0.45 | 0.75 | 750 | 20 | 2 Meg | 300 | A: .025 .002 B: .094 .015 C: .250 .020 | A: (.64 .05) B: (2.39 .38) C: (6.35 .51) |
| MS175 | 0.60 | 1.2 | 750 | 20 | 2 K | 500 | A: .025 .002 B: .094 .015 C: .250 .020 | A: (.64 .05) B: (2.39 .38) C: (6.35 .51) |
| MS176 | 0.60 | 1.8 | 750 | 45 | 5 Meg | 500 | A: .025 .002 B: .094 .015 C: .313 .020 | A: (.64 .05) B: (2.39 .38) C: (7.95 .51) |
| MS210 | 1.2 | 2.4 | 750 | 45 | 3 K | 500 | A: .025 .002 B: .109 .025 C: .313 .030 | A: (.64 .05) B: (2.77 .64) C: (7.95 .76) |
| MS214 | 1.8 | 2.4 | 750 | 45 | 5 Meg | 500 | A: .025 .002 B: .140 .030 C: .400 .060 | A: (.64 .05) B: (3.56 .76) C: (10.16 1.52) |
| MS220 | 1.8 | 3.6 | 800 | 20 | 10 Meg | 1,000 | A: .032 .002 B: .165 .030 C: .575 .050 | A: (.81 .05) B: (4.19 .76) C: (14.61 1.27) |
| MS221 | 2.4 | 4.8 | 800 | 45 | 10 Meg | 1,000 | A: .040 .002 B: .230 .030 C: .480 .060 | A: (1.02 .05) B: (5.84 .76) C: (12.19 1.52) |
| MS223 | 2.4 | 3.6 | 1,000 | 20 | 4 Meg | 800 | A: .040 .002 B: .230 .030 C: .950 .060 | A: (1.02 .05) B: (5.84 .76) C: (24.13 1.52) |
| MS244 | 3.6 | 7.5 | 1,000 | 45 | 15 Meg | 2,000 | A: .040 .002 B: .300 .030 C: .570 .060 | A: (1.02 .05) B: (7.62 .76) C: (14.48 1.52) |
| MS245 | 4.8 | 9.0 | 1,000 | 20 | 6 Meg | 800 | A: .040 .002 B: .300 .030 C: .970 .060 | A: (1.02 .05) B: (7.62 .76) C: (24.64 1.52) |
| MS260 | 6.0 | 13.2 | 1,000 | 45 | 15 Meg | 2,000 | A: .040 .002 B: .350 .040 C: .910 .060 | A: (1.02 .05) B: (8.89 1.02) C: (23.11 1.52) |
| MS281 | 7.5 | * | 1,000 | 45 | 8 Meg | 2,000 | A: .040 .002 B: .350 .040 C: 1.250 .070 | A: (1.02 .05) B: (8.89 1.02) C: (31.75 1.78) |
| MS310 | 9.0 | * | 1,000 | 45 | 20 Meg | 4,500 | A: .040 .002 B: .350 .040 C: 2.000 .080 | A: (1.02 .05) B: (8.89 1.02) C: (50.80 2.03) |
| MS313 | 12.5 | * | 1,000 | 50 | 30 Meg | 6,000 | A: .040 .002 B: .350 .040 C: 2.000 .080 | A: (1.02 .05) B: (8.89 1.02) C: (50.80 2.03) |
| MS315 | 15.0 | * | 1,000 | 50 | 1 Meg | * | A: .040 .002 B: .350 .040 C: 3.000 .090 | A: (1.02 .05) B: (8.89 1.02) C: (76.20 2.29) |
| MS322 | 22.0 | * | 1,000 | 100 | 1.5 Meg | * | A: .040 .002 B: .350 .040 C: * | A: (1.02 .05) B: (8.89 1.02) C: * |
General Specifications:
- 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:
Curve A applies to all MS models except MS126, MS151, MS176. Curve B applies to MS126, MS151, MS176.
Ordering Information Example:
MS220 -100K - 1% (Model Number - Resistor Value - Tolerance)
Note: Models with low inductance construction are in shaded areas. Models with Caddock's Non-Inductive Resistance Pattern are in non-shaded areas.
2411181757_Caddock-MS244-1-00M-1-_C20484681.pdf
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