STMicroelectronics M93C46-WDW6TP 1KB Serial EEPROM, SO8W Package with SPI Interface

STMicroelectronics M93C46-WDW6TP Serial EEPROM Overview

The STMicroelectronics M93C46-WDW6TP is a high-performance 1KB serial electrically erasable programmable read-only memory (EEPROM) engineered for reliable non-volatile data retention in industrial, automotive, and IoT systems. It features a Serial Peripheral Interface (SPI)-a widely adopted synchronous serial communication standard-enabling fast, secure data exchange with microcontrollers and digital components. This makes it a trusted solution for B2B engineers prioritizing speed, durability, and manufacturing efficiency.

As a product from STMicroelectronics, a global leader in semiconductor innovation with decades of expertise in memory and automotive-grade components, the device meets strict quality benchmarks (including AEC-Q100 compliance for automotive applications). For more trusted industrial and automotive ICs, visit IC Manufacturer.

Technical Parameters of M93C46-WDW6TP

Key Technical Features of M93C46-WDW6TP

• SPI write protection (sector and full-chip options), preventing accidental erasure or modification of critical data (e.g., automotive calibration values, device serial numbers).
• Dual memory organization (8-bit/4-bit selectable), offering flexibility to match system data width requirements and optimize storage efficiency.
• Self-timed write cycles (up to 5ms), eliminating the need for external timing circuits and simplifying software integration for engineers.
• Low standby current (typical 1??A at 3V) and low active current (typical 5mA at 5V, 5MHz), optimizing power efficiency for battery-powered and automotive systems.
• High-temperature tolerance (-40??C to +125??C) and AEC-Q100 compliance, ensuring reliability in harsh automotive and industrial environments.

Advantages of M93C46-WDW6TP Over Alternative Solutions

Compared to parallel EEPROMs, low-speed serial memory, or non-automotive-grade alternatives, the M93C46-WDW6TP delivers three critical benefits for B2B designs:

First, its SPI interface balances speed and simplicity. Parallel EEPROMs require 8+ data/address pins and are limited by board space, while low-speed I2C EEPROMs (typically 1MHz max) struggle with high-speed systems. The M93C46-WDW6TP??s 5MHz SPI interface enables fast data transfers (ideal for industrial control or automotive ECUs) while using just 3?C4 pins-saving PCB space without sacrificing performance.

Second, its automotive-grade durability outperforms consumer-grade alternatives. Most consumer EEPROMs only operate up to +85??C and lack AEC-Q100 qualification, making them unreliable in engine bays or industrial machinery. The M93C46-WDW6TP??s -40??C to +125??C range and AEC-Q100 compliance ensure it survives temperature spikes, vibration, and electrical noise-critical for automotive and heavy-industry applications.

Third, its SO8W package improves manufacturing efficiency. Narrow-body SO8 packages (0.95mm pitch) are prone to soldering shorts in high-volume assembly, but the SO8W??s 1.27mm wide pin spacing reduces defects. This lowers rework costs for manufacturers scaling production of automotive ECUs, industrial sensors, or IoT gateways.

Typical Applications of M93C46-WDW6TP

The M93C46-WDW6TP is engineered to solve non-volatile storage challenges in harsh and high-speed environments. Its key use cases include:

• Automotive Electronics: Storing ECU calibration data (e.g., fuel injection settings, emission control parameters) and vehicle serial numbers-ensuring performance consistency across temperature shifts and complying with automotive safety standards.
• Industrial Automation: Retaining PLC operational parameters (e.g., motor speed setpoints, alarm thresholds) and sensor calibration logs in factory machinery-withstanding harsh factory temperatures and electrical noise.
• Security and Surveillance: Saving device IDs, encryption keys, and camera configuration settings in high-speed security cameras-enabling fast boot times and secure data access for real-time monitoring.
• Internet of Things (IoT): Storing network credentials, sensor calibration data, and device metadata in industrial IoT gateways-balancing low power use with fast data transfers for remote asset tracking.
• Medical Devices: Preserving device serial numbers and calibration values in portable medical tools (e.g., infusion pumps) that operate in temperature-variable environments-complying with healthcare reliability standards.

Frequently Asked Questions (FAQ)

Why is the M93C46-WDW6TP suitable for automotive applications?

It meets AEC-Q100 Grade 2 qualification, a strict automotive standard for reliability, and operates across -40??C to +125??C-surviving engine bay heat and cold weather. Its 1 million write cycles and 40-year retention also ensure long-term reliability for vehicle lifespans (typically 10?C15 years).

How does the SPI interface??s 5MHz clock frequency benefit industrial systems?

Industrial control systems (e.g., PLCs, motor drives) require fast data updates to maintain precision. The 5MHz clock frequency enables the M93C46-WDW6TP to transfer data up to 5x faster than 1MHz I2C EEPROMs, reducing latency for time-sensitive tasks like adjusting motor setpoints or logging fault data.

What is the advantage of the dual 8-bit/4-bit memory organization?

Dual organization lets engineers match the EEPROM??s data width to the system??s microcontroller. For example, 8-bit mode works with standard 8-bit MCUs for storing configs, while 4-bit mode optimizes storage for 4-bit MCUs (e.g., in simple sensors). This flexibility eliminates the need for separate EEPROMs for different MCU architectures.

When should I use the sector or full-chip write protection feature?

Use sector protection to secure critical subsets of data (e.g., automotive calibration values) while allowing updates to less sensitive data (e.g., temporary logs). Use full-chip protection for data that never needs modification (e.g., device serial numbers or factory-set encryption keys) to prevent accidental erasure.

Can the M93C46-WDW6TP operate in low-power IoT devices?

Yes. Its low standby current (1??A typical) minimizes power draw when idle, and its 2.5V?C5.5V range works with common IoT batteries (e.g., 3V coin cells, 5V USB power). For industrial IoT gateways, it also balances low power use with fast 5MHz transfers-ideal for devices that need occasional high-speed updates.