Overview
The Allen-Bradley RC42GF121J is a 120-ohm, 2-watt carbon composition resistor designed for industrial control systems, test equipment, and electronic assemblies. With axial lead termination and ±5% tolerance, this component delivers stable performance in applications requiring reliable fixed resistance. The RC42GF121J features the proven construction of Allen-Bradley’s carbon composition resistor line, which has been widely deployed in control panels, machinery, and legacy automation systems.
Key Features
- Stable Resistance Value: 120Ω with ±5% tolerance ensures consistent circuit performance
- 2-Watt Power Rating: Suitable for mid-level power dissipation in standard industrial applications
- Carbon Composition Construction: Non-inductive, non-magnetic design ideal for signal circuits and relay applications
- Axial Lead Termination: Traditional through-hole mounting compatible with PCB and breadboard layouts
- Oxygen-Free Copper Leads: Corrosion-resistant termination for long service life
- Industrial Temperature Range: Operates reliably up to 70°C ambient temperature
Technical Specifications
- Resistance Value: 120 ohms
- Power Rating: 2 watts
- Tolerance: ±5%
- Termination Style: Axial leads
- Construction Material: Carbon composition element
- Lead Material: Oxygen-free copper
- Operating Temperature Range: –55°C to +70°C
- Package Quantity: 1 unit
- RoHS Compliant: Legacy component, original specification
Typical Applications
The RC42GF121J is commonly used in:
- PLC and industrial controller circuits
- Relay and solenoid control networks
- Test and measurement equipment
- Legacy automation system repairs and replacements
- Signal conditioning and biasing circuits
- Thermal management and load balancing applications
Compatibility & Replacements
The RC42GF121J is part of Allen-Bradley’s RC42GF series of carbon composition resistors, representing the industry-standard 2-watt fixed resistor line. Original equipment manufacturers and maintenance technicians commonly specify this resistor for panel rebuilds and system upgrades. While modern surface-mount thin-film resistors offer tighter tolerances, the RC42GF121J remains the preferred choice for through-hole applications requiring non-inductive performance and heritage equipment compatibility. Stock availability varies; verify current inventory with authorized distributors before placing large orders.
