The **RSS-3.309/P-R** is a high-performance, sub-miniature DC/DC converter manufactured by **RECOM Power**. It belongs to the Econoline series and is specifically designed for space-constrained applications requiring isolated power. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Input Voltage** | 3.3V DC (Nominal) | | **Output Voltage** | 9V DC | | **Output Current** | 111 mA | | **Power Rating** | 1 Watt | | **Isolation Voltage** | 1kV DC (Standard) | | **Efficiency** | 70% - 75% (Typical) | | **Package Type** | SMD (Surface Mount Device) | | **Operating Temp** | -40°C to +85°C (without derating) | --- ### 2. Part Number Breakdown Understanding the suffix codes helps in identifying specific features: * **RSS**: Single Output SMD DC/DC Converter. * **3.3**: Input Voltage (3.3V). * **09**: Output Voltage (9V). * **P**: Short Circuit Protection (Continuous). * **R**: Tape and Reel Packaging (for automated assembly). --- ### 3. Electronic Features & Internal Components The RSS-3.309/P-R functions as an isolated unregulated converter. Its internal architecture generally consists of: * **Oscillator Circuit:** Converts the DC input into a high-frequency AC signal. * **Isolation Transformer:** Small ferrite core transformer that provides galvanic isolation between input and output, preventing ground loops. * **Rectifier & Filter:** Converts the AC signal back to DC and smooths the ripple. * **Protection Circuitry:** The "P" version includes enhanced protection against output short circuits, automatically recovering once the fault is removed. --- ### 4. Typical Applications These parts are commonly used in industrial and communication electronics: * **Ground Loop Elimination:** Breaking noise paths in sensitive analog circuits. * **Voltage Level Shifting:** Boosting a 3.3V logic rail to 9V for operational amplifiers or sensors. * **Isolated Data Interfaces:** Providing power to isolated RS-485 or CAN bus transceivers. --- ### 5. Footprint and Mounting As an **SMD** component, it is designed for reflow soldering. The compact footprint allows it to be placed on the backside of PCBs or in high-density modules where vertical space is limited compared to through-hole (SIP) versions.