The **UB225SKW035D-3JB** is a specific high-quality illuminated push-button switch manufactured by **NKK Switches**. It belongs to the UB2 series, which is known for its low-profile design and reliable tactile feedback. --- ### 1. Part Number Breakdown Understanding the alphanumeric code reveals the specific electronic and mechanical characteristics of the component: | Code | Feature | Description | | :--- | :--- | :--- | | **UB2** | Series | Low Profile Pushbutton Series | | **25** | Circuit | DPDT (Double Pole Double Throw) | | **SK** | Actuator Type | Square Body / Snap-in Mount | | **W** | Contact Material | Silver Contacts (Power Rated) | | **03** | Termination | Straight PC Terminals | | **5D** | LED Color | Amber LED (Single Color) | | **3JB** | Cap Type/Color | Square Cap with Clear Lens and White Filter/Diffuser | --- ### 2. Technical Specifications These are the critical electrical and physical parameters for circuit integration: #### Electrical Characteristics * **Current/Voltage Rating:** 5A @ 125/250V AC or 5A @ 30V DC (Silver contacts). * **Contact Resistance:** 50 milliohms maximum. * **Insulation Resistance:** 200 Megohms minimum @ 500V DC. * **Dielectric Strength:** 1,000V AC minimum between contacts; 1,500V AC minimum between contacts and case. #### Mechanical & Environmental * **Switch Function:** On-(On) — This is a **momentary** action (it only stays "on" while pressed). * **Mechanical Life:** 1,000,000 operations minimum. * **Operating Force:** 1.90 Newtons. * **Operating Temperature:** -25°C to +50°C (-13°F to +122°F) for illuminated models. --- ### 3. Key Internal Components #### A. DPDT Configuration The "25" in the part number indicates a **Double Pole Double Throw** circuit. This means the switch can control two separate electrical circuits simultaneously, switching each between two different outputs. #### B. LED Illumination (5D) The unit features a built-in **Amber LED**. * **Forward Voltage ($V_f$):** Typically 2.0V. * **Forward Current ($I_f$):** Typically 20mA. * *Note: An external resistor is required to prevent burning out the LED if your power supply exceeds the forward voltage.* #### C. Silver Contacts (W) Silver contacts are chosen for power applications. They provide excellent conductivity and are capable of handling higher currents (up to 5A) compared to gold-plated contacts, which are usually reserved for low-level logic signals. --- ### 4. Typical Applications * **Control Panels:** Industrial machinery and automation interfaces. * **Broadcast Equipment:** Audio/Video switching consoles. * **Medical Instrumentation:** Diagnostic equipment requiring high-reliability tactile feedback. * **Test & Measurement:** Laboratory grade power or signal toggling.