The **M95128-RBN3TP** is a specific variant of an EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. It is widely used in automotive, industrial, and consumer electronics for non-volatile data storage. --- ## 1. Core Technical Specifications The model number encodes specific characteristics of the chip. Below is the breakdown of its primary technical parameters: | Parameter | Specification | | :--- | :--- | | **Memory Size** | 128 Kbit (16,384 bytes) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 20 MHz (depending on voltage) | | **Operating Voltage** | 1.8V to 5.5V | | **Package Type** | TDFN8 (also known as UFDFPN8) | | **Temperature Range** | -40°C to +125°C (Automotive Grade 1) | | **Write Endurance** | 4 million write cycles | | **Data Retention** | 200 years | --- ## 2. Pin Configuration and Functions The M95128 usually comes in an 8-pin package. Here is the standard mapping for the TDFN8/UFDFPN8 package: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **S#** | Chip Select (Active Low) | | 2 | **Q** | Serial Data Output | | 3 | **W#** | Write Protect | | 4 | **Vss** | Ground | | 5 | **D** | Serial Data Input | | 6 | **C** | Serial Clock | | 7 | **HOLD#** | Hold (Suspends communication) | | 8 | **Vcc** | Supply Voltage | --- ## 3. Key Electronic Features ### SPI Communication Modes The device supports SPI modes **0** (0,0) and **3** (1,1). Data is latched on the rising edge of the clock (C) and shifted out on the falling edge. ### Write Protection Mechanisms * **Hardware Protection:** The **W#** pin can be used to freeze the status register, preventing accidental writes. * **Software Protection:** Internally, the device uses a "Write Enable Latch" (WEL) bit. You must send a specific command (`WREN`) before any write operation can occur. * **Block Protection:** Users can configure specific quarters or halves of the memory array to be read-only. ### Byte and Page Writing * **Byte Write:** Can write a single 8-bit byte to a specific address. * **Page Write:** Can write up to **64 bytes** in a single instruction cycle, which is significantly faster for large data transfers. --- ## 4. Part Number Decoder (M95128-RBN3TP) | Code | Meaning | | :--- | :--- | | **M95** | SPI Family EEPROM | | **128** | Density (128 Kbit) | | **-R** | Voltage range: 1.8V to 5.5V | | **BN** | Package: UFDFPN8 (Ultra-thin Dual Flat No-lead) | | **3** | Temperature: -40 to +125 °C | | **TP** | Packing: Tape & Reel |