Overview
The Allen-Bradley RCR42G181JS is a carbon composition resistor delivering 180Ω resistance at a 2-watt power rating with ±5% tolerance. Part of Allen-Bradley’s military-specification Grade-S (RCR) lineup, this component features oxygen-free copper axial leads and hot-molded carbon construction proven across decades of industrial applications. The RCR42G181JS is a drop-in replacement for legacy control systems, test fixtures, and equipment requiring the authentic sonic and electrical characteristics of genuine carbon composition technology.
Key Features
- Military-grade reliability: MIL-spec construction ensures performance in demanding environments and legacy equipment compatibility.
- Hot-molded carbon element: Non-inductive, non-magnetic design suitable for high-frequency circuits and precision applications.
- Axial lead termination: Standard solder-tail configuration compatible with through-hole PCB mounting and vintage chassis wiring.
- ±5% tolerance: Tight resistance tolerance for circuits requiring predictable impedance control.
- Wide operating range: Rated to 70°C with stable performance across standard industrial temperature profiles.
Technical Specifications
| Resistance Value | 180Ω |
| Power Rating | 2W |
| Tolerance | ±5% |
| Construction | Carbon Composition (Hot Molded) |
| Termination Style | Axial Leads (Oxygen-Free Copper) |
| Series | RCR42 (MIL-Spec Grade-S) |
| Operating Temperature Range | -55°C to +70°C |
| Resistance Range (Series) | 1Ω to 22MΩ Available |
| Voltage Rating | Standard industrial (500V typical for 2W axial) |
| Condition | New in Box (NOS) |
Typical Applications
- Industrial control panel bias resistors and current-limiting networks
- Legacy PLC and automation equipment repair and retrofit
- Test fixtures and measurement instrumentation calibration
- Audio/RF circuits requiring low-noise, non-inductive performance
- Vintage tube equipment restoration and reproduction builds
Compatibility & Replacements
The RCR42G181JS is compatible with original equipment manufacturers (OEMs) specifying MIL-R-11 or MIL-R-39008 carbon composition resistors in the 2-watt class. Direct equivalents include related Allen-Bradley RCR42 values and compatible Stackpole/Ohmite military-grade 2W axial carbon resistors of the same resistance value. Always verify footprint, voltage rating, and tolerance requirements before substitution in critical circuits. Stock is limited as Allen-Bradley carbon composition production has largely ceased; order now to secure inventory for ongoing maintenance and repair programs.
