The **R1S** and **R1D** series are types of **DC-DC Converters** manufactured by Recom Power. These are typically surface-mount (SMD) or through-hole components used to provide isolated power in electronic circuits. Below is a breakdown of their technical characteristics and differences. --- ## 1. Overview of the R1S and R1D Series Both series are **1-Watt** unregulated DC-DC converters designed for industrial applications where galvanic isolation is required. | Feature | R1S Series | R1D Series | | :--- | :--- | :--- | | **Output Type** | Single Output | Dual Output | | **Power Rating** | 1 Watt | 1 Watt | | **Isolation Voltage** | 1kV DC (standard) to 3kV DC | 1kV DC (standard) to 3kV DC | | **Efficiency** | Up to 80% | Up to 80% | | **Mounting** | SMD (Surface Mount) | SMD (Surface Mount) | --- ## 2. Key Electronic Components Inside While these are "black box" modules, their internal architecture consists of: * **Switching Controller:** A high-frequency oscillator that converts DC input to AC. * **Micro-Transformer:** Provides the magnetic isolation between input and output. * **Rectifier Diodes:** Converts the AC back into a DC output. * **Filter Capacitors:** Smooths the output ripple. --- ## 3. Detailed Specifications ### Input and Output * **Input Voltages:** Common options include 3.3V, 5V, 12V, 15V, and 24V DC. * **Output Voltages (R1S):** 3.3V, 5V, 9V, 12V, 15V, 24V. * **Output Voltages (R1D):** ±3.3V, ±5V, ±9V, ±12V, ±15V, ±24V. ### Typical Use Case (Isolation) These parts are used to break **Ground Loops**. For example, if you have a sensitive analog sensor and a noisy digital microprocessor, you use an R1S to power the sensor so the electrical noise from the processor does not interfere with the signal. --- ## 4. Part Numbering Example If you see a part labeled **R1S-0505/P**: 1. **R1S**: Single output series. 2. **05**: 5V Input. 3. **05**: 5V Output. 4. **/P**: Short circuit protection included. --- ## 5. Comparison Summary | Part | Best For... | Example Pinout | | :--- | :--- | :--- | | **R1S** | Simple logic level shifting or powering a single IC. | +Vin, -Vin, +Vout, -Vout | | **R1D** | Powering Op-Amps or components requiring positive and negative rails. | +Vin, -Vin, +Vout, Com, -Vout |