## Electronic Specifications: DSP2A-DC12V-R The **DSP2A-DC12V-R** is a high-sensitivity, miniature power relay manufactured by **Panasonic (formerly Matsushita)**. It is widely used in automation and control circuits due to its compact size and high switching capacity. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the specific features of this variant: | Segment | Meaning | Detail | | :--- | :--- | :--- | | **DSP** | Series Name | High sensitivity, polarized power relay | | **2A** | Contact Form | 2 Form A (DPST-NO: Double Pole Single Throw, Normally Open) | | **DC12V** | Nominal Voltage | 12V Direct Current coil | | **R** | Special Feature | Reverse polarity type (usually refers to pin orientation/layout) | --- ### 2. Technical Specifications Below are the primary electrical and mechanical characteristics: #### **Coil Data (Input)** * **Nominal Operating Voltage:** 12V DC * **Pick-up Voltage:** Max 80% of nominal (approx. 9.6V) * **Drop-out Voltage:** Min 10% of nominal (approx. 1.2V) * **Nominal Operating Power:** ~300 mW * **Coil Resistance:** ~480 $\Omega$ (subject to tolerance) #### **Contact Data (Output)** * **Contact Arrangement:** 2 Form A (2 NO) * **Contact Material:** Gold-clad silver alloy * **Max. Switching Voltage:** 250V AC / 30V DC * **Max. Switching Current:** 5A (AC/DC) * **Max. Switching Power:** 1,250 VA / 150 W --- ### 3. Key Features * **High Sensitivity:** Requires low power to actuate the coil, making it suitable for direct drive by some ICs or small transistors. * **High Breakdown Voltage:** Provides 3,000V RMS between contacts and coil, ensuring safety and isolation. * **Compact Design:** Ideal for high-density PCB mounting. * **Polarized:** Uses a permanent magnet to achieve high sensitivity (note: coil polarity must be observed). --- ### 4. Circuit Example (Driving the Relay) Since this is a polarized DC relay, a flyback diode is essential to protect the driving circuit from inductive spikes. ```cpp // Schematic Logic [Control Signal] --> [Transistor Base] | (VCC 12V) ----+---- [Relay Coil (+)] | | [Flyback Diode] | | | (GND) --------+---- [Relay Coil (-)] ``` ---