Product Overview
The Caddock Type MS Power Film Resistors are designed for high-performance applications, offering a wide resistance range and a maximum operating temperature of +275C. These resistors deliver full power and voltage ratings without derating, featuring non-inductive performance and extended critical resistance values. Built with Caddock's proprietary Micronox resistance films fired onto a ceramic core, they provide exceptional long-term stability, even under high ambient temperatures, thermal shock, and high power densities. The patented non-inductive serpentine resistive pattern ensures maximum flux field cancellation, leading to faster settling times and minimal distortion in high-frequency circuits. Manufactured under intensive controls and subjected to rigorous reliability testing, Type MS resistors are ideal for simplifying circuit design and reducing equipment cost and complexity.
Product Attributes
- Brand: Caddock Electronics, Inc.
- 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 applications on specific models.
- Encapsulation: High Temperature Silicone Conformal
- Certifications/Approvals: Conformance to Mil-I-45208 approved procedures (in many recent surveys); included in Caddock Reliability Testing Program (Extended Life, Shock, Vibration, Humidity verified).
- Construction: Non-Inductive serpentine resistive pattern (most models)
Technical Specifications
| Model No. | Power Rating (Watts) at +125C | Power Rating (Watts) at +25C | Resistance Min. () | Resistance Max. () | Max. Voltage (V) | Dimensions (inches tolerance) B | Dimensions (inches tolerance) A | Dimensions (inches tolerance) C |
|---|---|---|---|---|---|---|---|---|
| MS126 | 0.25 | 0.50 | 20 | 1 Meg | 500 | .070 .015 (1.78 .38) | .188 .020 (4.78 .51) | 1.500 .125 (38.10 3.18) |
| MS150 | 0.30 | 0.50 | 20 | 2 K | 500 | .070 .015 (1.78 .38) | .188 .020 (4.78 .51) | 1.500 .125 (38.10 3.18) |
| MS151 | 0.45 | 0.75 | 20 | 2 Meg | 750 | .094 .015 (2.39 .38) | .250 .020 (6.35 .51) | 1.500 .125 (38.10 3.18) |
| MS175 | 0.60 | 0.75 | 20 | 2 K | 750 | .094 .015 (2.39 .38) | .250 .020 (6.35 .51) | 1.500 .125 (38.10 3.18) |
| MS176 | 0.60 | 0.75 | 45 | 5 Meg | 750 | .094 .015 (2.39 .38) | .313 .020 (7.95 .51) | 1.500 .125 (38.10 3.18) |
| MS210 | 1.2 | 1.0 | 45 | 3 K | 750 | .109 .025 (2.77 .64) | .313 .030 (7.95 .76) | 1.500 .125 (38.10 3.18) |
| MS214 | 1.8 | 1.0 | 45 | 5 Meg | 750 | .140 .030 (3.56 .76) | .400 .060 (10.16 1.52) | 1.500 .125 (38.10 3.18) |
| MS220 | 1.8 | 2.0 | 20 | 10 Meg | 1,000 | .165 .030 (4.19 .76) | .575 .050 (14.61 1.27) | 1.500 .125 (38.10 3.18) |
| MS221 | 2.4 | 3.0 | 45 | 10 Meg | 1,000 | .230 .030 (5.84 .76) | .480 .060 (12.19 1.52) | 1.500 .125 (38.10 3.18) |
| MS223 | 2.4 | 3.0 | 20 | 4 Meg | 1,000 | .230 .030 (5.84 .76) | .950 .060 (24.13 1.52) | 1.500 .125 (38.10 3.18) |
| MS244 | 3.6 | 4.0 | 45 | 15 Meg | 1,000 | .300 .030 (7.62 .76) | .570 .060 (14.48 1.52) | 1.500 .125 (38.10 3.18) |
| MS245 | 4.8 | 4.0 | 20 | 6 Meg | 1,000 | .300 .030 (7.62 .76) | .970 .060 (24.64 1.52) | 1.500 .125 (38.10 3.18) |
| MS260 | 6.0 | 6.0 | 45 | 15 Meg | 1,000 | .350 .040 (8.89 1.02) | .910 .060 (23.11 1.52) | 1.500 .125 (38.10 3.18) |
| MS281 | 7.5 | 8.0 | 45 | 8 Meg | 1,000 | .350 .040 (8.89 1.02) | 1.250 .070 (31.75 1.78) | 1.500 .125 (38.10 3.18) |
| MS310 | 9.0 | 10.0 | 45 | 20 Meg | 1,000 | .350 .040 (8.89 1.02) | 2.000 .080 (50.80 2.03) | 1.500 .125 (38.10 3.18) |
| MS313 | 12.5 | 12.5 | 50 | 30 Meg | 1,000 | .350 .040 (8.89 1.02) | 2.000 .080 (50.80 2.03) | 1.500 .125 (38.10 3.18) |
| MS315 | 15.0 | 15.0 | 50 | 1 Meg | 1,000 | .350 .040 (8.89 1.02) | 3.000 .090 (76.20 2.29) | 1.500 .125 (38.10 3.18) |
| MS322 | * | 22.0 | 100 | 1.5 Meg | 1,000 | .350 .040 (8.89 1.02) | 3.000 .090 (76.20 2.29) | 1.500 .125 (38.10 3.18) |
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
- Dielectric Strength: Varies by model (see table)
Derating Curve:
A derating curve is provided, indicating power and voltage ratings as a percentage of ambient temperature. Type A applies to all MS models except MS126, MS151, MS176. Type B applies to MS126, MS151, MS176.
Ordering Information Example: MS220 -100K - 1% (Model Number - Resistor Value - Tolerance)
Note: Models with low inductance construction are indicated in shaded areas in the provided diagrams. Models with Caddock's Non-Inductive Resistance Pattern are in non-shaded areas.
2411181757_Caddock-MS220-1-00M-1-_C20482929.pdf
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