The **RSS-3.33.3-R** is a specific model of a DC/DC converter belonging to the **RSS series** manufactured by **RECOM Power**. It is a sub-miniature, isolated, unregulated component typically used for board-level power distribution. ### 1. Technical Specifications The part number defines its core electrical characteristics. Here is the breakdown: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Input Voltage** | 3.3V DC | Nominal input range (typically ±10%) | | **Output Voltage** | 3.3V DC | Fixed output | | **Power Rating** | 1 Watt | Maximum power output | | **Isolation** | 1kV DC | Input-to-output isolation voltage | | **Package Type** | SMD | Surface Mount Device (R-Suffix) | | **Efficiency** | ~70% - 75% | Typical efficiency at full load | --- ### 2. Key Features and Component Design The "RSS" series is designed for applications where space is at a premium and isolation is required to prevent noise or ground loops. * **Unregulated Output:** This means the output voltage is not strictly controlled; it will vary slightly based on the load and the input voltage fluctuations. * **Galvanic Isolation:** It uses an internal transformer to physically and electrically separate the input circuit from the output circuit. * **Short Circuit Protection:** It usually features a limited duration of short-circuit protection (typically 1 second). * **Wide Temperature Range:** Operates from **-40°C to +85°C** without derating. --- ### 3. Pinout and Internal Structure The "R" in the suffix indicates it is provided in **Reel** packaging or a specific **SMD** layout. The internal architecture consists of: 1. **Oscillator:** Converts DC input to high-frequency AC. 2. **Transformer:** Provides the 1kV isolation and steps the voltage. 3. **Rectifier & Filter:** Converts AC back to the 3.3V DC output. ### 4. Typical Applications * **Digital Logic:** Providing isolated power to microcontrollers or sensors. * **Industrial Interfaces:** Powering RS-485 or CAN bus transceivers to prevent ground loops. * **Noise Reduction:** Separating sensitive analog circuits from noisy digital power rails. --- ### 5. Part Number Decoding ```text RSS - 3.3 3.3 - R | | | | | | | +-- Packaging (Reel/SMD) | | +------- Output Voltage (3.3V) | +----------- Input Voltage (3.3V) +----------------- Series Name (Isolated 1W Converter) ```