The **DA3N-R** is a specific model of a **Miniature Toggle Switch** manufactured by **C&K (now part of Littelfuse)**. It belongs to the DA series, which is known for its subminiature size and reliability in signal-level switching applications. --- ### 1. Key Technical Specifications Below are the primary electronic and physical characteristics of the DA3N-R: | Feature | Specification | | :--- | :--- | | **Contact Configuration** | SPDT (Single Pole Double Throw) | | **Switch Function** | ON-ON (Maintained) | | **Contact Rating** | 0.4 VA max @ 20 V AC or DC (Logic Level) | | **Operating Life** | 50,000 make-and-break cycles | | **Insulation Resistance** | 10^9 $\Omega$ min | | **Contact Resistance** | Below 20 m$\Omega$ typ. initial | | **Termination Style** | Right Angle, PC Thru-hole | --- ### 2. Physical Components and Construction #### A. Actuator (Toggle) The "N" in the part number often refers to a standard height actuator. It is typically made of chrome-plated brass or thermoplastic, designed for manual operation. #### B. Housing and Base * **Case:** Made of glass-filled nylon (UL 94V-0), which is flame retardant. * **Bushing:** Non-threaded, allowing for a compact footprint on the PCB. #### C. Contacts and Terminals * **Gold Over Nickel:** Because this switch is rated for 0.4 VA (low power), the contacts are plated with gold. This prevents oxidation and ensures reliable switching at very low voltages and currents (where an arc wouldn't be strong enough to "clean" silver contacts). * **Right Angle (R):** The "R" suffix indicates that the terminals are bent at a 90-degree angle. This allows the switch to be mounted on a horizontal PCB while the toggle protrudes from a vertical front panel. --- ### 3. Circuit Diagram (SPDT) The DA3N-R operates as a basic change-over switch: ```text (Common) [2] / \ / \ [1] [3] (Pos A) (Pos B) ``` * **Position 1:** Terminal 2 is connected to Terminal 1. * **Position 2:** Terminal 2 is connected to Terminal 3. --- ### 4. Common Applications Due to its low-power rating and right-angle mounting, it is frequently used in: * **Handheld Instruments:** Power or mode selection. * **Telecommunications:** Signal routing. * **Medical Equipment:** User interface controls. * **Computers/Peripherals:** Reset or configuration switches.