The **CJS-1201TB2** is a surface-mount (SMD) slide switch manufactured by **Nidec Components** (formerly Copal Electronics). It is primarily used for signal switching in compact electronic devices. --- ## 1. Technical Specifications The CJS series is known for its ultra-miniature profile and reliability. Below are the key technical parameters: | Property | Specification | | :--- | :--- | | **Circuit Configuration** | SPDT (Single Pole Double Throw) | | **Switching Function** | ON - ON | | **Current Rating** | 100 mA | | **Voltage Rating** | 6 VDC | | **Contact Resistance** | 100 mΩ Max | | **Insulation Resistance** | 100 MΩ Min (at 100 VDC) | | **Dielectric Strength** | 500 VAC for 1 minute | | **Mechanical Life** | 200 cycles | | **Operating Temperature** | -40°C to +85°C | --- ## 2. Key Physical Features * **Mounting Type:** SMD (Surface Mount Device) with "J-hook" or "Gull-wing" lead shapes (indicated by the "B" in the part number). * **Actuator Style:** Side-actuated (Side slide). This allows for low-profile mounting where space above the PCB is limited. * **Size:** Extremely small footprint, typically around 3.0mm x 2.5mm, making it ideal for high-density boards. * **Washable Construction:** The "1201" series often features a heat-resistant resin that allows for automated soldering and, in some variants, immersion cleaning. --- ## 3. Part Number Breakdown: CJS-1201TB2 Understanding the nomenclature helps identify the exact variant: | Segment | Meaning | | :--- | :--- | | **CJS** | Series Name (Ultra-miniature Slide Switch) | | **1** | Number of poles (1 pole) | | **2** | Number of positions (2 positions) | | **01** | Standard specification code | | **T** | Packaging (T = Taping/Reel for automated assembly) | | **B** | Terminal Shape (B = Gull-wing leads) | | **2** | Actuator/Direction (2 = Side-actuated) | --- ## 4. Common Applications Due to its small size and low current rating, this component is not used for power switching, but rather for: * **Configuration Settings:** Replacing DIP switches for selecting modes on a PCB. * **Handheld Electronics:** Powering small sensors or logic circuits in wearables. * **Medical Devices:** Compact diagnostic tools. * **Telecommunications:** Signal routing in mobile infrastructure.