The **CT-6556-R** is a specific electronic component, typically categorized as a **through-hole vertical cermet trimmer potentiometer**. These components are widely used for "set-and-forget" resistance adjustments on printed circuit boards (PCBs). Below is a breakdown of its electronic characteristics, specifications, and physical properties. --- ### 1. Technical Specifications The "CT-6" series is manufactured by Nidec Components (formerly Copal Electronics). The "R" suffix usually denotes the specific terminal pin orientation or packaging style. | Feature | Specification | | :--- | :--- | | **Type** | Single-turn Cermet Trimmer | | **Adjustment Slot** | Top Adjust (Vertical) | | **Resistance Range** | 10 $\Omega$ to 2 M$\Omega$ (Variable based on specific part number) | | **Resistance Tolerance** | ±10% or ±20% | | **Power Rating** | 0.5 Watts at 70°C | | **Temperature Coefficient** | ±100 ppm/°C | | **Operating Temp Range** | -55°C to +125°C | | **Mechanical Rotation** | 240° (effective electrical angle 210°) | --- ### 2. Core Components and Materials * **Cermet Element:** The resistive track is made of "Cermet" (a Ceramic-Metal composite). This provides better stability and lower temperature sensitivity compared to carbon-based potentiometers. * **Wiper:** A multi-finger metal contact that slides across the cermet element to vary the resistance. * **Housing:** Usually a square, high-temperature plastic (UL94V-0 rated) designed to withstand wave soldering. * **Sealing:** These units are often "O-ring" sealed, making them washable and resistant to dust and flux during the manufacturing process. --- ### 3. Pin Configuration and Mechanical Drawing The "6556" designation refers to the specific physical footprint. * **Pin 1 & 3:** The fixed ends of the resistive element. * **Pin 2 (Center):** The adjustable "wiper" connected to the adjustment screw. * **Lead Shape:** Through-hole pins arranged in a triangular or offset pattern to ensure stability on the PCB. --- ### 4. Common Applications Due to its reliability and precision, the CT-6556-R is found in: 1. **Industrial Controls:** Calibrating sensors or gain levels in amplifiers. 2. **Power Supplies:** Fine-tuning output voltage or current limits. 3. **Medical Equipment:** Adjusting reference voltages in diagnostic tools. 4. **Telecommunications:** Signal balancing and circuit tuning.