The **CM09-R25S** is a specialized high-density electrical connector, typically used in industrial and telecommunications applications. It belongs to the **D-Subminiature** family, specifically the "Mixed Layout" or high-performance sub-series. ### 1. Technical Specifications Below are the primary electrical and mechanical characteristics of the CM09-R25S: | Feature | Specification | | :--- | :--- | | **Connector Type** | D-Sub Connector | | **Gender** | Female (Socket/Receptacle) | | **Number of Positions** | 25 Pins | | **Mounting Type** | Right Angle (Through-Hole) | | **Contact Material** | Copper Alloy | | **Plating** | Gold (on contact area), Tin (on solder tails) | | **Current Rating** | 3A to 5A per contact (typical) | | **Voltage Rating** | 250V AC/DC | --- ### 2. Key Components and Construction The assembly of the CM09-R25S consists of several critical electronic and structural parts: * **Insulator (Dielectric):** Usually made of glass-filled PBT (Polybutylene Terephthalate) or similar thermoplastic with a high UL94V-0 flammability rating to prevent electrical arching. * **Female Sockets:** Precision-machined or stamped contacts designed for high mating cycles. The gold plating ensures low contact resistance and prevents oxidation. * **Metal Shell:** A steel shell (often tin or zinc plated) provides EMI/RFI shielding and structural grounding when connected to the chassis. * **Boardlocks / Harpoons:** These are the mechanical metal tabs that hold the connector onto the PCB during the soldering process. --- ### 3. Pinout and Signal Integrity The "25S" designation indicates a 25-pin configuration arranged in two rows (13 pins on top, 12 on bottom). * **Signal Application:** commonly used for RS-232 serial communication, parallel ports, or proprietary industrial control signals. * **Right Angle Design:** The "R" in the part number usually signifies a 90-degree bend in the pins. This allows the connector to be mounted on the edge of a PCB while the interface faces outward from the device enclosure. --- ### 4. Common Applications * **Industrial Automation:** Connecting PLCs to HMI screens. * **Telecommunications:** Data transmission in networking racks. * **Medical Equipment:** High-reliability signal interfaces for diagnostic machinery. * **Legacy Computing:** Standardized interface for older peripheral devices.