The **17TK-66-R** is a specific model of a **Tactile Switch** (push-button) commonly used in electronic circuitry for user interface controls. It is manufactured by various component brands, often adhering to standard industry dimensions for through-hole mounting. --- ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | Tactile Switch | | **Circuitry** | SPST (Single Pole Single Throw), Normally Open (NO) | | **Actuator Height** | 4.3mm - 5.0mm (standard variant) | | **Base Size** | 6mm x 6mm | | **Mounting Style** | Through-hole (DIP) | | **Operating Force** | Typically 160gf (Grams-force) | | **Voltage Rating** | 12V DC | | **Current Rating** | 50mA | --- ### Key Electronic Features 1. **Tactile Feedback:** The "TK" designation often refers to the tactile click feel provided when the internal metal dome makes contact, giving the user physical confirmation of the press. 2. **Contact Resistance:** These switches are designed for low-power signaling, typically maintaining a contact resistance of less than $100m\Omega$. 3. **Durability:** Most variants in this series are rated for approximately 100,000 to 500,000 cycles, depending on the specific manufacturer’s material quality. 4. **Pin Configuration:** It features 4 pins. Internally, pins are connected in pairs; pressing the button bridges the two pairs to complete the circuit. ### Common Applications * **Consumer Electronics:** Reset buttons on routers, power buttons on monitors. * **Prototyping:** Widely used on breadboards and PCB projects (Arduino/Raspberry Pi). * **Industrial:** Control panels and membrane keypad interfaces. --- ### Internal Circuit Diagram Below is a representation of the pin logic for a standard 6x6 tactile switch: ```text (Top View) Pin 1 --- Pin 2 | | [ Switch ] | | Pin 3 --- Pin 4 *Pins 1 & 2 are internally connected. *Pins 3 & 4 are internally connected. *Pressing the button connects (1,2) to (3,4). ```