The **JQ5-R** is a specific model of a **Miniature Intermediate Power Relay**. It is widely used in industrial automation, PCB design, and home appliances for switching high-current loads with a low-power control signal. --- ## 1. Core Technical Specifications The "JQ5-R" typically refers to a standard 5-pin or 4-pin PCB-mounted relay. Below are the general electrical characteristics: | Parameter | Typical Value | | :--- | :--- | | **Contact Configuration** | 1 Form A (SPST-NO) or 1 Form C (SPDT) | | **Coil Voltage (Nominal)** | 5V, 12V, or 24V DC (varies by sub-model) | | **Switching Capacity** | 5A to 10A @ 250VAC / 30VDC | | **Coil Power Consumption** | ~200mW to 450mW | | **Contact Resistance** | ≤ 100mΩ | | **Insulation Resistance** | 1,000MΩ (at 500VDC) | | **Operating Temperature** | -40°C to +85°C | --- ## 2. Key Internal Components The JQ5-R operates through electromagnetic induction. Its internal structure consists of: ### A. The Coil An insulated copper wire wound around a core. When current flows through it, it creates a magnetic field. In the "R" variant, this coil is often optimized for high sensitivity (low trigger current). ### B. The Armature and Spring A movable iron part that is attracted by the coil's magnetic field. The spring ensures the armature returns to its original position (Rest state) when power is removed. ### C. The Contacts Usually made of **Silver Alloy (AgNi or AgSnO2)**. * **Stationary Contact:** Fixed to the relay frame. * **Movable Contact:** Attached to the armature. --- ## 3. Pinout Diagram Description A standard JQ5-R (SPDT version) usually has 5 pins: 1. **Coil Pin 1:** Input for control voltage. 2. **Coil Pin 2:** Ground/Return for control voltage. 3. **Common (COM):** The terminal that moves between the other two contacts. 4. **Normally Open (NO):** Connected to COM only when the relay is energized. 5. **Normally Closed (NC):** Connected to COM when the relay is off. --- ## 4. Application Circuit Example To use a JQ5-R with a microcontroller (like an Arduino), a driving circuit is required because the MCU pins cannot provide enough current for the coil. ```cpp // Logic Diagram [MCU Pin] -> [Resistor] -> [Base of NPN Transistor] | [JQ5-R Coil] + [Flyback Diode] | [VCC] ``` --- ## 5. Summary of Features * **Subminiature Size:** Saves space on high-density PCBs. * **High Dielectric Strength:** High isolation between the low-voltage control side and the high-voltage load side. * **Wash Tight/Flux Proof:** Usually sealed to protect against soldering flux or environmental moisture.