The **SDTM-630-RTR** is a high-performance, shielded, right-angle micro SD card connector (Memory Card Socket) designed for surface mount technology (SMT). It is commonly used in portable electronics, embedded systems, and industrial devices requiring compact storage solutions. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Connector Type** | Micro SD (TF Card) Socket | | **Mounting Type** | Surface Mount (SMT), Right Angle | | **Insertion Style** | Push-Push (Click in, Click out) | | **Number of Contacts** | 8 Signal Pins + Shell/Grounding | | **Pitch** | 1.10 mm | | **Voltage Rating** | 100V AC/DC | | **Current Rating** | 0.5A per contact | | **Durability** | 5,000 to 10,000 Mating Cycles | --- ### 2. Electronic Component Breakdown #### A. Contact Pins The connector features gold-plated copper alloy contacts. Gold plating is critical for: * **Corrosion Resistance:** Prevents oxidation in humid environments. * **Signal Integrity:** Maintains low contact resistance (typically <100mΩ) for high-speed data transfer. #### B. Housing and Shielding * **Material:** High-temperature thermoplastic (LCP - Liquid Crystal Polymer) capable of withstanding reflow soldering temperatures (up to 260°C). * **Shielding:** A stainless steel shell provides EMI (Electromagnetic Interference) protection and mechanical strength, ensuring the card remains securely seated. #### C. The "Push-Push" Mechanism Unlike "Push-Pull" sockets, the SDTM-630-RTR utilizes an internal spring-loaded cam and follower mechanism. This allows the user to eject the card by pressing it inward, reducing the risk of damaging the internal pins during manual extraction. #### D. Card Detection Switch Most variants of this series include a **Card Detect (CD)** pin. This is a physical switch that shorts to ground or opens when a card is inserted, allowing the microcontroller to "wake up" or initialize the SPI/SDIO communication bus only when a card is present. --- ### 3. Application Circuit Considerations When integrating this part into a PCB design, consider the following electronic requirements: ```cpp // Typical Pinout Mapping Pin 1: DAT2 Pin 2: CD/DAT3 (Chip Select in SPI) Pin 3: CMD (MOSI in SPI) Pin 4: VDD (Power: 2.7V - 3.6V) Pin 5: CLK (Clock) Pin 6: VSS (Ground) Pin 7: DAT0 (MISO in SPI) Pin 8: DAT1 Pin 9: Card Detect Switch ``` * **Decoupling:** A 0.1µF and 10µF capacitor should be placed near the VDD pin to stabilize power during high-speed data bursts. * **Pull-up Resistors:** 10kΩ to 50kΩ pull-ups are usually required on the DAT and CMD lines to prevent floating signals. ---