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 by providing full power and voltage ratings without derating, exceptional long-term stability (0.05% per 1,000 hours typical), and higher voltage ratings without minimum wire size limitations. They feature Caddock's patented Non-Inductive serpentine resistive pattern for maximum flux field cancellation, resulting in performance comparable to a straight wire of the same length, leading to faster settling times and minimum distortion in high-frequency circuits. Manufactured under intensive controls and included in the Caddock Reliability Testing Program, these resistors utilize Micronox resistance films fired onto a ceramic core for outstanding stability under various environmental stresses.
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: Conformance to Mil-I-45208 requirements (approved in recent surveys); included in Caddock Reliability Testing Program (Extended Life, Shock, Vibration, Humidity verification).
- Origin: USA (implied by address)
Technical Specifications
| Model No. | Power Rating (Watts at +125C) | Power Rating (Watts at +25C) | Resistance Min. () | Resistance Max. () | Max. Voltage (V) | Dielectric Strength (V) | B (inches .015) | A (inches .020) | C (inches .020) |
|---|---|---|---|---|---|---|---|---|---|
| MS126 | 0.25 | 0.50 | 20 | 1 Meg | 200 | 500 | .070 (1.78) | .188 (4.78) | .020 (.51) |
| MS150 | 0.30 | 0.60 | 20 | 2 K | 300 | 500 | .070 (1.78) | .188 (4.78) | .020 (.51) |
| MS151 | 0.45 | 0.90 | 20 | 2 Meg | 300 | 750 | .094 (2.39) | .250 (6.35) | .025 (.64) |
| MS175 | 0.60 | 1.2 | 20 | 2 K | 500 | 750 | .094 (2.39) | .250 (6.35) | .025 (.64) |
| MS176 | 0.75 | 1.5 | 45 | 5 Meg | 500 | 750 | .094 (2.39) | .313 (7.95) | .025 (.64) |
| MS210 | 1.2 | 2.4 | 45 | 3 K | 500 | 750 | .109 (2.77) | .313 (7.95) | .025 (.64) |
| MS214 | 1.8 | 3.6 | 45 | 5 Meg | 500 | 750 | .140 (3.56) | .400 (10.16) | .025 (.64) |
| MS220 | 2.0 | 4.0 | 20 | 10 Meg | 1,000 | 800 | .165 (4.19) | .575 (14.61) | .032 (.81) |
| MS221 | 2.4 | 4.8 | 45 | 10 Meg | 1,000 | 800 | .230 (5.84) | .480 (12.19) | .040 (1.02) |
| MS223 | 2.4 | 4.8 | 20 | 4 Meg | 800 | 1,000 | .230 (5.84) | .950 (24.13) | .040 (1.02) |
| MS244 | 3.6 | 7.2 | 45 | 15 Meg | 2,000 | 1,000 | .300 (7.62) | .570 (14.48) | .040 (1.02) |
| MS245 | 4.8 | 9.6 | 20 | 6 Meg | 800 | 1,000 | .300 (7.62) | .970 (24.64) | .040 (1.02) |
| MS260 | 6.0 | 12.0 | 45 | 15 Meg | 2,000 | 1,000 | .350 (8.89) | .910 (23.11) | .040 (1.02) |
| MS281 | 7.5 | 15.0 | 45 | 8 Meg | 2,000 | 1,000 | .350 (8.89) | 1.250 (31.75) | .040 (1.02) |
| MS310 | 9.0 | 18.0 | 45 | 20 Meg | 4,500 | 1,000 | .350 (8.89) | 2.000 (50.80) | .040 (1.02) |
| MS313 | 13.2 | 22.0 | 50 | 30 Meg | 6,000 | 1,000 | .350 (8.89) | 2.000 (50.80) | .040 (1.02) |
| MS315 | * | * | 50 | 1 Meg | 1,000 | 1,000 | .350 (8.89) | 3.000 (76.20) | .040 (1.02) |
| MS322 | * | * | 100 | 1.5 Meg | 1,000 | 1,000 | .350 (8.89) | 3.000 (76.20) | .040 (1.02) |
* Limited by power rating.
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:
A - all MS models except MS126, MS151, MS176
B - MS126, MS151, MS176
Ordering Information Example: MS220 -100K - 1% (Model Number - Resistor Value - Tolerance)
Note: Models with Caddock's Non-Inductive Resistance Pattern are in non-shaded areas of the model list. Certain products shown are covered by one or more patents; other patents are pending.
2411181757_Caddock-MS220-10-0K-1-_C20482775.pdf
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