The **CT-5E-R/Q** is a specific model within the **CT-5 series** of sub-miniature, single-turn cermet trimming potentiometers (trimmers), commonly manufactured by companies like Nidec Components (formerly Copal Electronics). --- ## 1. Technical Specifications The "R/Q" suffix usually refers to the packaging style (taping/reel orientation). Below are the core electronic characteristics: | Parameter | Specification | | :--- | :--- | | **Resistance Range** | 10 $\Omega$ to 2 M$\Omega$ | | **Resistance Tolerance** | ± 10% | | **Power Rating** | 0.25 W (at 70°C) | | **Temperature Coefficient** | ± 100 ppm/°C | | **Maximum Input Voltage** | 200 V (DC or AC rms) | | **Rotation Angle** | 210° (Mechanical: 240°) | | **Mounting Type** | Through-hole | --- ## 2. Component Structure The CT-5E-R/Q is composed of several critical electronic and mechanical layers: ### A. Resistive Element (Cermet) The "heart" of the component is a **Cermet** (Ceramic-Metal) track. Cermet is preferred in electronic design because it offers high stability, low noise, and excellent heat resistance compared to carbon film. ### B. Wiper Assembly The wiper is the moving contact that slides across the cermet track. In the CT-5 series, these are typically precious metal multi-contact wipers to ensure low contact resistance variation (CRV). ### C. Housing (Sealing) The "E" in the part number often signifies a top-adjustment style with a sealed construction. * **Sealing:** These units are typically **washable** (IP67 equivalent), meaning they can withstand board washing processes after soldering without fluid entering the internal mechanism. --- ## 3. Circuit Application In an electronic circuit, the CT-5E-R/Q is used as a variable resistor or a voltage divider. ```cpp // Typical Voltage Divider Configuration // [Pin 1] ---- [Pin 2 (Wiper)] ---- [Pin 3] // Vin Vout GND Vout = Vin * (R2_3 / (R1_2 + R2_3)) ``` --- ## 4. Part Number Breakdown (Suffix Meaning) * **CT-5:** Series name (Sub-miniature single turn). * **E:** Top adjustment style. * **R/Q:** These relate to **Taping Orientation**. * **R:** Specifies the orientation of the leads relative to the feed holes in the tape. * **Q:** Often denotes a specific quantity per reel or a variant in the ammo pack/reel packaging standard. ---