Product Overview
The Caddock Type MS Power Film Resistors are high-performance axial-lead resistors designed for demanding applications. They offer a wide resistance range, high power and voltage ratings, and exceptional stability, even at elevated temperatures up to +275C. Featuring Caddock's patented non-inductive serpentine resistive pattern, these resistors minimize inductive effects, leading to faster settling times and reduced distortion in high-frequency circuits. Constructed with Micronox resistance films fired onto a ceramic core, they provide superior long-term stability and reliability, making them 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 Coating
- Manufacturing Control: Conforms to Mil-I-45208 requirements (as described on page 8).
- Reliability Verification: Included in Caddock Reliability Testing Program (Extended Life, Shock, Vibration, Humidity).
- Patents: Certain products covered by one or more patents; patents pending.
Technical Specifications
| Model No. | Power (Watts) @ +125C | Power (Watts) @ +25C | Resistance Min. () | Resistance Max. () | Max. Voltage (V) | Dielectric Strength (V) | Dimensions B (in/mm) | Dimensions A (in/mm) | Dimensions C (in/mm) |
|---|---|---|---|---|---|---|---|---|---|
| MS126 | 0.25 | 0.50 | 20 | 1 Meg | 500 | 200 | .070 .015 (1.78 .38) | .188 .020 (4.78 .51) | .020 .002 (.51 .05) |
| MS150 | 0.30 | 0.45 | 20 | 2 K | 500 | 300 | .070 .015 (1.78 .38) | .188 .020 (4.78 .51) | .020 .002 (.51 .05) |
| MS151 | 0.45 | 0.60 | 20 | 2 Meg | 750 | 300 | .094 .015 (2.39 .38) | .250 .020 (6.35 .51) | .025 .002 (.64 .05) |
| MS175 | 0.60 | 0.75 | 20 | 2 K | 750 | 500 | .094 .015 (2.39 .38) | .250 .020 (6.35 .51) | .025 .002 (.64 .05) |
| MS176 | 0.60 | 1.2 | 45 | 5 Meg | 750 | 500 | .094 .015 (2.39 .38) | .313 .020 (7.95 .51) | .025 .002 (.64 .05) |
| MS210 | 0.75 | 1.8 | 45 | 3 K | 750 | 500 | .109 .025 (2.77 .64) | .313 .030 (7.95 .76) | .025 .002 (.64 .05) |
| MS214 | 1.2 | 1.8 | 45 | 5 Meg | 750 | 500 | .140 .030 (3.56 .76) | .400 .060 (10.16 1.52) | .025 .002 (.64 .05) |
| MS220 | 1.8 | 2.4 | 20 | 10 Meg | 800 | 1,000 | .165 .030 (4.19 .76) | .575 .050 (14.61 1.27) | .032 .002 (.81 .05) |
| MS221 | 2.4 | 2.4 | 45 | 10 Meg | 800 | 1,000 | .230 .030 (5.84 .76) | .480 .060 (12.19 1.52) | .040 .002 (1.02 .05) |
| MS223 | 1.8 | 3.6 | 20 | 4 Meg | 1,000 | 800 | .230 .030 (5.84 .76) | .950 .060 (24.13 1.52) | .040 .002 (1.02 .05) |
| MS244 | 2.4 | 4.8 | 45 | 15 Meg | 1,000 | 2,000 | .300 .030 (7.62 .76) | .570 .060 (14.48 1.52) | .040 .002 (1.02 .05) |
| MS245 | 2.4 | 6.0 | 20 | 6 Meg | 1,000 | 800 | .300 .030 (7.62 .76) | .970 .060 (24.64 1.52) | .040 .002 (1.02 .05) |
| MS260 | 3.6 | 7.5 | 45 | 15 Meg | 1,000 | 2,000 | .350 .040 (8.89 1.02) | .910 .060 (23.11 1.52) | .040 .002 (1.02 .05) |
| MS281 | 4.8 | 9.0 | 45 | 8 Meg | 1,000 | 2,000 | .350 .040 (8.89 1.02) | 1.250 .070 (31.75 1.78) | .040 .002 (1.02 .05) |
| MS310 | 6.0 | 13.2 | 45 | 20 Meg | 1,000 | 4,500 | .350 .040 (8.89 1.02) | 2.000 .080 (50.80 2.03) | .040 .002 (1.02 .05) |
| MS313 | 7.5 | * | 50 | 30 Meg | 1,000 | 6,000 | .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 | * | .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 | * | .350 .040 (8.89 1.02) | * | .040 .002 (1.02 .05) |
Other 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.
Ordering Information Example: MS220 -100K - 1% (Model Number - Resistor Value - Tolerance)
Derating Curve:
A - all MS models except MS126, MS151, MS176
B - MS126, MS151, MS176
(Derating curve graph not included as it is visual data.)
Note: Models with Caddock's Non-Inductive Resistance Pattern are in non-shaded areas of the model list.
2411181757_Caddock-MS310-100-1-_C20484311.pdf
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