The part number **M5R84THJ-R** refers to a high-performance **Micro-SD (TransFlash) Connector** manufactured by **Yamaichi Electronics**. It is specifically designed for mobile devices, IoT hardware, and compact embedded systems. --- ### 1. Technical Specifications The M5R84THJ-R is a "Push-Push" type connector, meaning the card is inserted by pushing it in and removed by pushing it again to trigger a spring release. | Parameter | Specification | | :--- | :--- | | **Component Type** | Micro-SD Card Connector | | **Mounting Type** | Surface Mount (SMT) | | **Eject Mechanism** | Push-Push | | **Number of Pins** | 8 Pins + 1 Switch (Card Detection) | | **Height** | Low Profile (typically ~1.45mm to 1.85mm) | | **Contact Plating** | Gold (Au) over Nickel | | **Operating Temp** | -25°C to +85°C | --- ### 2. Key Features * **Card Detection Switch:** Includes an internal mechanical switch that signals the microcontroller (MCU) when a card is physically present. * **Brake Mechanism:** High-quality variants of this series often feature a "brake" or controlled ejection to prevent the Micro-SD card from flying out too fast. * **Shielding:** The outer metal shell is grounded to the PCB to provide EMI (Electromagnetic Interference) protection, ensuring data integrity at high speeds. * **Reverse-Mount Support:** The "R" in the suffix often denotes the orientation or specific reel packaging, but in this series, it typically indicates a standard top-mount configuration with specific footprint alignments. --- ### 3. Pin Configuration (Typical for Micro-SD) While the physical housing is proprietary to Yamaichi, the 8 pins follow the SDIO/SPI standard interface: | Pin # | Name | Description (SD Mode) | | :--- | :--- | :--- | | 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 | | 6 | VSS | Ground | | 7 | DAT0 | Data Line 0 | | 8 | DAT1 | Data Line 1 | --- ### 4. Common Applications * **Smartphones & Tablets:** Due to the extremely thin profile. * **Dash Cams:** Reliability under vibration and heat. * **Single Board Computers (SBCs):** Used as the primary boot or storage interface. * **Handheld Medical Devices:** Where secure card retention is critical.