Overview
The Allen-Bradley RCR42G204JS is a military-grade carbon composition resistor rated at 200kΩ with a 2W power dissipation and ±5% tolerance. The RCR designation indicates MIL-SPEC Grade-S construction, representing one of the highest reliability standards for carbon composition resistors. These components feature axial lead termination with oxygen-free copper leads and are constructed using hot-molded carbon resistive elements.
Key Features
- MIL-SPEC reliability: Outstanding pulse withstanding, power dissipation, high frequency stability, low inductance, and rugged construction
- Military Grade-S designation: RCR prefix denotes the Military Grade-S designation, the premium tier in Allen-Bradley carbon composition resistors
- Non-inductive design: Solid cylindrical carbon resistive element with embedded leads, making them rugged and highly reliable with non-magnetic and non-inductive characteristics
- Axial lead configuration for through-hole mounting
- ±5% tolerance for controlled circuit behavior
- Hot-molded carbon construction for long-term stability
Technical Specifications
- Resistance Value: 200 kΩ
- Power Rating: 2 W
- Tolerance: ±5%
- Temperature Rating: Up to 70°C ambient
- Lead Type: Axial (through-hole)
- Lead Material: Oxygen-free copper
- Construction: Hot-molded carbon composition
- Specification: MIL-R-39008 (Military Grade-S)
Typical Applications
Carbon composite resistors from Allen-Bradley have been held in high regard for hi-fi and for guitar amp use, as well as industrial control systems, aerospace equipment, and legacy circuit repairs. The high reliability and low-noise characteristics make these resistors ideal for audio circuits, filter networks, biasing applications, and any system requiring predictable long-term performance without drift or noise generation.
Compatibility & Replacements
This is a NOS (New Old Stock) component. Production stopped in the 1990s and direct modern replacements are limited. For new designs, engineers typically specify metal film or thick-film resistors; however, for restoration or repair of vintage electronics and legacy industrial equipment, this exact part is often necessary. Equivalent resistance values in 5% tolerance carbon composition resistors may be sourced from other NOS stock, but the RCR42G204JS offers the premium MIL-SPEC construction and documented reliability specifications.
