The **GS-R24F0502.0** is a specialized high-efficiency step-down (buck) switching regulator module, historically manufactured by STMicroelectronics. It is part of the GS-R series designed to provide high current output with minimal external components. ### 1. Technical Specifications Below is a breakdown of the primary electrical characteristics: | Parameter | Value | | :--- | :--- | | **Input Voltage Range** | 9V to 40V DC | | **Output Voltage** | 5.0V DC | | **Output Current** | 2.0A | | **Efficiency** | ~80% to 85% (depending on load) | | **Switching Frequency** | ~100 kHz | | **Package Type** | Vertical Mount (Through-hole) | --- ### 2. Internal Electronic Components The GS-R24F0502.0 is a "system-in-package" (SiP) that integrates several discrete parts into a single shielded module: * **Switching Controller:** An internal PWM controller that regulates the duty cycle to maintain a steady 5V output. * **Power MOSFET:** A high-side switch that handles the incoming 24V/40V rail. * **Power Inductor:** A built-in coil that stores energy during the "on" cycle and releases it during the "off" cycle. * **Schottky Diode:** Used for freewheeling to complete the circuit when the MOSFET is off. * **Filter Capacitors:** Internal ceramic or electrolytic capacitors to reduce input/output ripple. --- ### 3. Pinout and Connection The module typically features a simple pin configuration to simplify PCB design: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | **+Vin** | Unregulated DC input (up to 40V) | | **2** | **Input GND** | Return path for input power | | **3** | **Output GND** | Return path for 5V load | | **4** | **+Vout** | Regulated 5V output | | **5** | **Reset / Inhibit** | (Optional) Used for remote ON/OFF or signaling | --- ### 4. Key Features & Applications * **Short Circuit Protection:** The module includes internal current limiting to protect against output faults. * **Thermal Shutdown:** If the internal temperature exceeds safe limits, the device shuts down to prevent permanent damage. * **No Heatsink Required:** Due to high efficiency, it often operates without an external heatsink at nominal room temperatures. * **Common Use Cases:** Industrial automation, telecommunications equipment, and automotive electronics where a stable 5V rail is needed from a 24V bus. --- **Note:** This part is largely considered legacy or obsolete. Modern designs typically replace this module with smaller, higher-frequency DC-DC converters (like the Recom R-78 series or TI's LM series switchers).