Overview
The Allen-Bradley RC42GF115J is a precision carbon composition resistor engineered for industrial control and electronic applications requiring stable high-resistance values. This 2-watt, 1.1-megohm component combines time-proven hot-molded construction with oxygen-free copper leads, making it ideal for retrofit and repair of legacy industrial equipment where original Allen-Bradley components are specified.
Key Features
- Hot-molded carbon composition element for thermal and electrical stability
- Oxygen-free copper axial leads minimize oxidation and ensure reliable soldering
- ±5% tolerance (J-grade) meets tight specification requirements
- Operating temperature range to 70°C with predictable resistance drift characteristics
- Compliant with MIL-R-39008 military specification standards
Technical Specifications
- Manufacturer: Allen-Bradley
- Part Number: RC42GF115J
- Resistance Value: 1.1 MΩ (1,100,000 ohms)
- Power Rating: 2 watts
- Tolerance: ±5% (J-grade)
- Construction: Hot-molded carbon composition
- Lead Material: Oxygen-free copper, axial terminals
- Max Operating Temperature: 70°C ambient
- Specification: MIL-R-39008 / MIL-R-11A
- Packaging: Individual unit, New in Box
Typical Applications
The RC42GF115J serves critical functions in legacy industrial control systems, including bias resistors in signal conditioning circuits, high-impedance load resistors in analog front-ends, and gate/grid protection networks in power electronics. Common use cases span vintage PLC analog input modules, motor control preamps, sensor interface conditioning, and instrumentation calibration networks.
Compatibility & Replacements
This resistor directly replaces original Allen-Bradley RC42GF115J components in field service and board-level repair. While modern thin-film or metal-film 1.1MΩ resistors offer better temperature stability, the RC42GF115J maintains compatibility with circuits designed for carbon composition characteristics and vintage equipment documentation. Always verify schematic tolerances, temperature derating, and application voltage before substitution. Equivalent Allen-Bradley RC42 series models in other resistance values (RC42GF116J for 11MΩ, RC42GF114J for 0.11MΩ) are available for alternative design requirements.
