The **JDL-A4F-R** is a specific electronic component, commonly identified as a **Micro-Switch** or **Tactile Switch**, often used in industrial controls, automotive interfaces, and consumer electronics. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. General Specifications The JDL-A4F-R is characterized by its compact form factor and momentary action. | Parameter | Specification (Typical) | | :--- | :--- | | **Switch Type** | Momentary Tactile Switch | | **Contact Form** | SPST (Single Pole Single Throw) | | **Operating Force** | 160gf to 250gf (Gram-force) | | **Current Rating** | 50mA | | **Voltage Rating** | 12V DC | | **Contact Resistance** | ≤ 100mΩ | | **Insulation Resistance** | ≥ 100MΩ (100V DC) | | **Dielectric Strength** | 250V AC for 1 minute | --- ### 2. Key Electronic Features * **Snap-Action Mechanism:** The switch utilizes a metal dome contact. When the actuator is pressed, the dome collapses to provide tactile feedback (a "click") and completes the electrical circuit. * **Low Power Design:** Rated for 50mA at 12V, this switch is designed for signal-level switching rather than direct power control. It is typically connected to a microcontroller (MCU) GPIO pin. * **Bounce Time:** Like most mechanical switches, it exhibits "contact bounce." In electronic circuits, this requires a software or hardware **debouncing** circuit (typically 5ms to 10ms). * **Through-Hole Mounting (R-Suffix):** The "R" often denotes a specific packaging (like Reel) or a Right-Angle orientation, allowing the switch to be mounted perpendicular to the PCB. --- ### 3. Connection Diagram (Internal) The switch typically has four pins, but internally they are connected in pairs to provide structural stability on the PCB. ```text Pin 1 ---[ Switch ]--- Pin 3 | Pin 2 ------+---------- Pin 4 Note: Pins 1 & 2 are usually tied together internally, as are Pins 3 & 4. ``` --- ### 4. Common Applications * **User Interfaces:** Reset buttons, mode selectors, or power buttons on small appliances. * **Automotive:** Dashboard controls or key fob buttons. * **Industrial:** PCB-mounted input triggers for PLC modules.