The **SDTM-650-RTR** is a specialized electronic component, specifically a **Micro SD Memory Card Connector**. This part is designed for surface-mount technology (SMT) and is commonly used in consumer electronics to provide a removable storage interface. --- ### Technical Specifications The following table summarizes the key electrical and mechanical characteristics of the SDTM-650-RTR: | Feature | Specification | | :--- | :--- | | **Component Type** | Micro SD (TransFlash) Connector | | **Mounting Type** | Surface Mount (SMT / SMD) | | **Card Detection** | Typically includes a Card Detection Switch | | **Ejection Mechanism** | Push-Push (Push to insert, Push to eject) | | **Number of Contacts** | 8 Pins + Shield/Ground | | **Pitch** | 1.10 mm | | **Packaging** | Tape & Reel (indicated by "RTR") | --- ### Key Electronic Components & Design #### 1. Contact Material and Plating The pins are usually made of a copper alloy. To ensure high conductivity and prevent oxidation over many insertion cycles, the contact areas are typically plated with **Gold (Au)** over a **Nickel (Ni)** underplate. #### 2. The "Push-Push" Mechanism Unlike "Push-Pull" slots, the RTR series often features a spring-loaded mechanism. This involves: * **Heart-shaped Cam Track:** A mechanical path that locks the card in place. * **Coil Spring:** Provides the tension required to eject the card when pressed a second time. #### 3. Integrated Switch (Card Detection) The "SDTM" series generally includes an internal leaf switch. When a card is fully inserted, it closes (or opens) a circuit, signaling the microcontroller (MCU) that a storage device is present and ready for initialization. #### 4. Shielding and Grounding The outer shell is made of stainless steel or a similar metal alloy. This serves two purposes: * **EMI Shielding:** Protects the high-speed data signals from electromagnetic interference. * **Structural Integrity:** Provides solder tabs (Solder Nails) to securely anchor the connector to the PCB, preventing it from being ripped off during manual use. --- ### Pinout Configuration While specific layouts vary by manufacturer, a standard Micro SD interface (like that in the SDTM-650) follows this general pin logic: | Pin # | Name | Description | | :--- | :--- | :--- | | 1 | DAT2 | Data Line 2 | | 2 | CD/DAT3 | Card Detect / Data Line 3 | | 3 | CMD | Command / Response | | 4 | VDD | Supply Voltage (2.7V - 3.6V) | | 5 | CLK | Clock Signal | | 6 | VSS | Ground | | 7 | DAT0 | Data Line 0 | | 8 | DAT1 | Data Line 1 | ---