STMicroelectronics M93C76-RMN3TP/K

Overview

M93C76-RMN3TP/K from STMicroelectronics is an automotive-grade 8-Kbit serial EEPROM with MICROWIRE™ interface, organized as 1024 × 8-bit or 512 × 16-bit, operating from 1.8 V to 5.5 V across −40 °C to +125 °C. It supports byte/word write in ≤4 ms, features READY/BUSY signaling on Q pin, and delivers 4 million write cycles at 25 °C for infotainment configuration storage.

For engineers reviewing the M93C76-RMN3TP/K datasheet, M93C76-RMN3TP/K pinout, M93C76-RMN3TP/K application, or M93C76-RMN3TP/K equivalent, this page provides verified technical context, validated pin functions, automotive-qualified endurance/reliability data, and real-world use cases in body control modules and ADAS sensor calibration.

Technical Context

The M93C76-RMN3TP/K implements a synchronous MICROWIRE™ protocol with start-bit–driven instruction framing, supporting READ, WRITE, WEN/WDS, ERASE, ERAL, and WRAL commands. Its dual x8/x16 organization is selected via the ORG pin (VSS = byte mode, open/VCC = word mode), and internal address auto-increment enables sequential read streams up to full memory size.

Write operations are self-timed with BUSY status signaled on Q while S is high; no external erase cycle is required prior to WRITE. The device includes Power-on Data Protection and POR circuitry to prevent spurious writes during power ramp-up/down, and supports static (0 Hz) to 2 MHz clock rates with guaranteed timing margins per AC characteristics table.

Key Specifications

Pinout & Package

Package: SO8 narrow (MN), 150 mil body width, RoHS-compliant and Halogen-free (ECOPACK2®).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with AT25DF041A-SSH-T and M95M02-RMN6TP, the M93C76-RMN3TP/K uniquely combines MICROWIRE™ compatibility, AEC-Q100 Grade 1 qualification, dual x8/x16 organization, and guaranteed 125 °C operation - making it the only drop-in solution for legacy automotive designs requiring pin- and protocol-level replacement without firmware or layout changes.

Availability

M93C76-RMN3TP/K is available at Aetrix Electronics and suitable for body control modules, ADAS sensor calibration, instrument clusters, and telematics control units requiring stable component supply across automotive production lifecycles.

Supply support for M93C76-RMN3TP/K includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and memory products for automotive, industrial, and consumer markets.

The M93Cx6-A125 product line delivers AEC-Q100 qualified serial EEPROMs optimized for automotive subsystems requiring extended temperature operation, high endurance, and robustness against power supply transients.

FAQ

What is the function of the ORG pin on M93C76-RMN3TP/K?

The ORG pin selects memory organization: connecting ORG to VSS configures the device as 1024 × 8-bit (x8), while leaving it open or tying it to VCC configures it as 512 × 16-bit (x16). This setting determines address bit count (11 vs. 10 bits) and data width per access, and must be stable before power-up to ensure correct initialization and minimal standby current.

How does the READY/BUSY signal work on the Q pin?

When S is high during a write/erase operation, the Q pin outputs LOW (BUSY) until programming completes, then transitions HIGH (READY). This allows polling without interrupts or fixed delays. During READ, Q outputs data bits; BUSY/READY behavior is disabled unless S remains asserted post-instruction, per datasheet Figure 5 timing diagrams.

Is M93C76-RMN3TP/K compatible with standard SPI interfaces?

No - it uses the MICROWIRE™ protocol (a subset of SPI with 3-wire, start-bit–driven framing), not standard SPI. It lacks MOSI/MISO separation and requires specific start-bit + op-code + address sequences per Table 7. Direct SPI master connection will fail without protocol translation or dedicated MICROWIRE™ driver firmware.

What is the purpose of the NC (pin 8) on the SO8 package?

Pin 8 is marked DU (Do Not Use) and reserved for STMicroelectronics factory testing. It has no functional role in normal operation and may be left unconnected, tied to VCC, or tied to VSS without affecting device behavior. PCB layout should avoid routing signals to this pin to prevent unintended coupling or ESD paths.