The **M8S44FCJ-R** is a specific technical component, typically identified as a specialized **Micro-SD (TF) Card Connector**. These components are critical in electronic hardware design for providing a physical and electrical interface between a PCB (Printed Circuit Board) and external flash storage. Below is a detailed breakdown of its electronic characteristics and specifications. --- ## 1. Core Specifications The "FCJ" series usually refers to a specific form factor and mounting style. Here is a summary of the typical technical attributes for this part: | Attribute | Specification | | :--- | :--- | | **Component Type** | Micro-SD (TF) Card Slot | | **Mounting Style** | Surface Mount (SMT / SMD) | | **Card Detection** | Normally Open (with detection switch) | | **Number of Pins** | 8 Data/Power pins + 2/4 Shielding/GND pins | | **Insertion Mechanism** | Push-Push (Press to insert, Press to eject) | | **Orientation** | Top Mount / Right Angle | --- ## 2. Electrical Characteristics To ensure signal integrity and power stability, the following electrical parameters are standard for this class of connector: * **Current Rating:** Typically 0.5A per pin. * **Voltage Rating:** Maximum 10V - 100V AC/DC (Logic levels are usually 3.3V). * **Contact Resistance:** $\leq$ 100 mΩ (to minimize signal loss). * **Insulation Resistance:** $\geq$ 1000 MΩ at 500V DC. * **Dielectric Withstanding Voltage:** 500V AC for 1 minute. --- ## 3. Physical & Mechanical Features ### A. Push-Push Mechanism The "R" suffix often indicates specific reel packaging or a refined mechanical variant. The **Push-Push** mechanism includes an internal spring and hook system. This is preferred in consumer electronics (like cameras or handheld devices) where the card needs to be flush with the enclosure. ### B. Materials and Plating * **Housing:** High-temperature thermoplastic (LCP - Liquid Crystal Polymer), rated for reflow soldering temperatures ($\approx$ 260°C). * **Contacts:** Copper alloy with selective **Gold Plating** on the contact area to prevent oxidation and ensure reliable data transmission. * **Shell:** Stainless steel or Nickel-plated steel for EMI shielding and structural rigidity. --- ## 4. Typical Pinout Configuration While you should always consult the specific datasheet for the M8S44FCJ-R, standard Micro-SD pinouts are as follows: | 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 (GND) | | 7 | DAT0 | Data Line 0 | | 8 | DAT1 | Data Line 1 | | (GND) | Shield | External Shell Grounding | --- ## 5. Design Considerations * **Card Detection:** The internal switch allows the MCU (Microcontroller) to know if a card is present before attempting to initialize the SPI or SDIO bus. * **EMI Shielding:** The metal shell must be soldered to the PCB ground plane to reduce electromagnetic interference. * **Footprint:** Ensure the "Keep-out" area on the PCB accounts for the card's ejection path.