Overview
The Allen-Bradley RCR20G390JS is a military-specification carbon composition resistor engineered for demanding applications requiring high reliability and stable electrical performance. This RCR20G390JS unit delivers 39 ohms of resistance with a 0.5 watt continuous power rating, making it ideal for signal conditioning circuits, bias networks, and impedance matching in aerospace, defense, and industrial equipment.
Key Features
- 39 ohm nominal resistance with tight ±5% tolerance
- 0.5 watt power dissipation rating
- Military RCR-series specification with proven field reliability
- Axial lead construction for through-hole PCB mounting
- Low-noise carbon composition element for audio and precision applications
- Temperature-stable performance across industrial operating range
Technical Specifications
This carbon composition resistor meets rigorous military standards for durability and repeatability:
- Resistance: 39 Ω
- Power Rating: 0.5 W (1/2 W)
- Tolerance: ±5% (J-band)
- Construction: Carbon composition film on ceramic substrate
- Package: Axial leads, 0.045″ diameter
- Type: Military RCR specification
- Temp. Coefficient: ±500 ppm/°C typical
- Operating Temperature: –55 °C to +125 °C
Typical Applications
- Bias resistor networks in analog amplifiers and op-amp circuits
- Pullup/pulldown resistors in logic and switching circuits
- Signal conditioning and impedance matching
- Audio and precision instrumentation input networks
- Aerospace, defense, and ruggedized equipment repair
- Legacy industrial equipment maintenance and board-level restoration
Compatibility & Replacements
Compatible With
- Allen-Bradley/Rockwell Automation legacy industrial control systems
- Military avionics and defense equipment (to MIL-PRF-12934 standard)
- Vintage test equipment requiring mil-spec components
- Through-hole PCB designs with 0.100″ grid spacing
- Standard 5% tolerance circuits and general-purpose applications
Replaces / Drop-In Replacement For
- Failed or out-of-spec RCR20G390JS units in original equipment
- Legacy Airco Speer Electronics RCR20G390JS resistor assemblies
- Low-power 39 Ω 0.5W carbon composition resistors rated to MIL-PRF-12934
- Verify exact mounting and electrical requirements with your equipment manufacturer before ordering
Works With
- Through-hole soldering and manual rework processes
- Wave soldering and selective solder systems
- Standard breadboard and prototype wiring layouts
- PCB designs requiring axial-lead resistors in tight spaces
- Any circuit requiring standard 39 ohm, 0.5W resistive load
