STMicroelectronics M95320-DFMC6TG

Overview

M95320-DFMC6TG from STMicroelectronics is a 32-Kbit serial SPI bus EEPROM organized as 4096 × 8 bits, operating from 1.7 V to 5.5 V supply and rated for -40°C to +85°C industrial temperature range. It features 20 MHz high-speed clock support, 32-byte page write capability (≤5 ms), and an additional lockable 32-byte Identification Page for secure parameter storage in embedded control systems.

For engineers reviewing the M95320-DFMC6TG datasheet, M95320-DFMC6TG pinout, M95320-DFMC6TG application, or M95320-DFMC6TG equivalent, key selection criteria include its ultra-low 1.7 V minimum V_CC, 4 million write cycles, 200-year data retention, and ECOPACK2®-compliant UFDFPN8 (2 × 3 mm) package with exposed pad for thermal performance.

Technical Context

The M95320-DF implements a standard SPI interface compliant with CPOL=0/CPHA=0 and CPOL=1/CPHA=1 modes, latching input on rising clock edge and outputting data on falling edge. Its internal architecture includes a status register with BP1/BP0 bits enabling quarter/half/whole memory array write protection, plus SRWD bit for permanent write-protect lock.

It integrates a dedicated Identification Page accessible only via READ ID/WRITE ID instructions - a non-volatile 32-byte region that supports Lock ID command to permanently disable further writes, making it suitable for calibration data, device serial numbers, or cryptographic keys in field-deployed systems.

Key Specifications

Pinout & Package

Package: UFDFPN8 (2 × 3 mm, 0.5 mm pitch), ECOPACK2®-compliant, with exposed thermal pad (pin 8 connected to VSS). RoHS-compliant, halogen-free, and designed for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25320B-MAHL-T and BR24T32FJ-WE2, M95320-DFMC6TG uniquely combines 1.7 V operation, 20 MHz speed, and a lockable Identification Page - making it the only choice for secure, low-voltage, high-throughput embedded configuration storage.

Availability

M95320-DFMC6TG is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control units, and medical device configuration management requiring stable component supply, long-term lifecycle assurance, and ECOPACK2® environmental compliance.

Supply support for M95320-DFMC6TG 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, specializing in microcontrollers, power management, and non-volatile memory solutions for industrial, automotive, and consumer markets.

The M95320 series belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, SPI-based configuration and calibration storage in harsh environments with extended temperature and voltage requirements.

FAQ

What is the function of the HOLD pin on M95320-DFMC6TG?

The HOLD pin pauses ongoing SPI communication without deselecting the device or resetting internal state. When asserted low, Q goes high-impedance and D/C are ignored, allowing the host MCU to service interrupts or perform other tasks. Communication resumes automatically upon HOLD deassertion, eliminating the need for re-synchronization or retransmission.

How does the Identification Page differ from standard memory pages?

The Identification Page is a dedicated 32-byte region accessible only via READ ID and WRITE ID instructions. Unlike main array pages, it supports the Lock ID command - a one-time irreversible operation that disables all future writes to this page, ensuring permanent protection of calibration data, serial numbers, or cryptographic keys against accidental or malicious overwrite.

Can M95320-DFMC6TG operate reliably during power supply brown-outs?

Yes. With a minimum operating voltage of 1.7 V and built-in power-on-reset (POR) circuitry, the device remains functional and maintains data integrity down to 1.7 V. The POR prevents spurious writes during power ramp-up, and the status register retains BP1/BP0 and SRWD bit states across power cycles - ensuring consistent protection behavior even after brown-out recovery.

Is external decoupling required for stable operation?

Yes. A 10–100 nF ceramic capacitor must be placed between VCC and VSS pins, as close as possible to the device. This suppresses high-frequency noise and transient voltage drops during SPI transitions and internal write cycles, preventing communication errors or premature write termination - especially critical at 20 MHz clock speeds and under load-switching conditions.