STMicroelectronics M24128-BFCS6TP/A

Overview

M24128-BFCS6TP/A from STMicroelectronics is a 128-Kbit (16-Kbyte) I²C-compatible EEPROM organized as 16 K × 8 bits, operating from 1.7 V to 5.5 V across –40 °C to +85 °C, supporting 1 MHz Fast-mode Plus, 400 kHz Fast-mode, and 100 kHz Standard-mode I²C bus protocols, with 64-byte page write capability and hardware write protection via WC pin - used in industrial sensor calibration storage and embedded system configuration retention.

For engineers reviewing the M24128-BFCS6TP/A datasheet, M24128-BFCS6TP/A pinout, M24128-BFCS6TP/A application, or M24128-BFCS6TP/A equivalent, key selection considerations include supply voltage range compatibility (1.7–5.5 V), I²C clock mode support (up to 1 MHz), 64-byte page size for efficient firmware parameter updates, and WC-controlled hardware write protection for critical configuration data integrity.

Technical Context

This EEPROM implements a standard I²C target protocol with 7-bit device addressing (base 0xA0/0xA1), where E0–E2 pins configure the three LSBs of the device address; in the UFDFPN8 package (CS6TP), all Ei pins are internally tied low, fixing the address to 0xA0/0xA1. The internal architecture includes an HV generator, page latches, ECC logic (for process-A/K variants), and a POR circuit ensuring safe power-up behavior.

It supports byte write, page write (max 64 bytes within same A15–A6 page boundary), random/sequential read, and - in M24128-D variants - a dedicated 64-byte identification page with permanent lock capability. Write cycles complete in ≤5 ms, and the device remains non-responsive on SDA during internal write, requiring ACK polling for synchronization.

Key Specifications

Pinout & Package

Package: UFDFPN8 (2 mm × 3 mm, 0.5 mm pitch, ECOPACK2-compliant). This lead-free, halogen-free, ultra-thin DFN package supports automated optical inspection and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C128C and BR24G128FJ, the M24128-BFCS6TP/A uniquely combines WC-based hardware write protection, 64-byte page efficiency, and ECOPACK2 UFDFPN8 packaging - offering optimal trade-offs for space-constrained industrial controllers requiring guaranteed data integrity without extended temperature operation.

Availability

M24128-BFCS6TP/A is available at Aetrix Electronics and suitable for industrial sensor calibration storage, smart meter configuration retention, and medical device parameter archiving requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for M24128-BFCS6TP/A 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, designing and manufacturing microcontrollers, power ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.

The M24128 series belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, I²C-based non-volatile data storage in space- and reliability-critical embedded systems.

FAQ

What is the function of the WC pin on M24128-BFCS6TP/A?

The WC (Write Control) pin is an active-high hardware protection input. When driven high, it disables all write operations - including byte write, page write, and identification page access - regardless of I²C command sequence. When low or floating, writes are enabled. This prevents accidental overwrites during power transitions or firmware errors, and requires no software intervention.

Does M24128-BFCS6TP/A support the identification page feature?

No. The identification page (64-byte dedicated read-only lockable area) is exclusive to M24128-D variants (e.g., M24128-DF). The M24128-BF designation indicates the base version without identification page circuitry - confirmed by ST's DS6639 Rev 33 datasheet section "Product status" and absence of ID page instructions in its command set.

What package type does the 'CS6TP' suffix indicate?

The 'CS6TP' suffix denotes the UFDFPN8 (Ultra-Fine Pitch Dual Flat No-lead, 8-terminal) package: 2.0 mm × 3.0 mm body, 0.5 mm pitch, 0.55 mm max height, with wettable flanks for automated optical inspection. Pin 1 is marked by a dot; E0, E1, and E2 pins are not bonded and read as logic 0 - fixing the I²C address to 0xA0/0xA1.

How does ACK polling work during write cycles?

During the ≤5 ms internal write cycle, the device ignores I²C traffic and returns NO ACK to any device select code. The host MCU repeatedly sends Start + device address (0xA0) until an ACK is received - signaling write completion. This avoids fixed delays and adapts to process/voltage/temperature variations, enabling deterministic timing in real-time systems without busy-wait loops.