The **RSS-243.3/HP-R** is a high-performance, regulated DC/DC converter manufactured by **Recom Power**. It belongs to the RSS series, specifically designed for industrial applications requiring isolation and high power density in a compact SMD (Surface Mount Device) package. --- ### 1. Key Specifications Below are the primary electrical characteristics of the component: | Parameter | Value | | :--- | :--- | | **Input Voltage Range** | 18V – 36V DC (24V Nominal) | | **Output Voltage** | 3.3V DC | | **Output Current** | 303mA | | **Power Rating** | 1 Watt | | **Isolation Voltage** | 2kV DC / 1 Second (High Isolation) | | **Efficiency** | ~75% - 80% | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Breakdown of the Model Name Understanding the nomenclature helps identify the specific features of this electronic part: * **RSS**: Series designation (Single Output, Regulated, SMD). * **24**: Nominal Input Voltage (24V). * **3.3**: Output Voltage (3.3V). * **H**: High Isolation (2kV DC). * **P**: Short Circuit Protection (Continuous). * **R**: Packaging Type (Tape & Reel). --- ### 3. Core Electronic Features #### A. Voltage Regulation Unlike "unregulated" converters where the output voltage fluctuates based on the load, this model is **fully regulated**. It ensures a stable 3.3V output regardless of minor fluctuations in the input voltage or changes in the load current. #### B. Isolation Barrier The device provides a **2kV DC galvanic isolation**. This is a critical electronic safety feature that: 1. Prevents noise from the input side from reaching the sensitive 3.3V logic side. 2. Protects low-voltage components from high-voltage surges on the primary rail. #### C. Short Circuit Protection (SCP) The "P" suffix indicates that the internal circuitry includes **Continuous Short Circuit Protection**. If the output pins are accidentally bridged, the converter will shut down or limit current to prevent thermal runaway and permanent damage. --- ### 4. Physical and Pin Configuration The part is housed in an **SMD-8** package, making it suitable for automated "pick-and-place" assembly. ```text Typical Pinout (Consult Datasheet for exact mapping): Pin 1: -Vin (Ground) Pin 2: +Vin (Positive Input) Pin 5: +Vout (Positive Output) Pin 8: -Vout (Common/Output Ground) ``` --- ### 5. Common Applications * **Industrial Controls:** Powering 3.3V microcontrollers from a 24V PLC rail. * **Data Communication:** Providing isolated power for RS-485 or CAN bus transceivers. * **Sensor Power:** Delivering clean, regulated power to digital sensors in noisy environments.