STMicroelectronics M24128-BWDW6TP

Overview

M24128-BWDW6TP from STMicroelectronics is a 128-Kbit (16-Kbyte) I²C-compatible serial EEPROM organized as 16 K × 8 bits, operating from 1.7 V to 5.5 V over –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 for parameter storage in industrial sensor nodes and embedded control modules.

For engineers reviewing the M24128-BWDW6TP datasheet, M24128-BWDW6TP pinout, M24128-BWDW6TP application, or M24128-BWDW6TP equivalent, key selection criteria include supply voltage range compatibility (1.7–5.5 V), I²C clock mode support (up to 1 MHz), 5 ms max write cycle time, 4 million write endurance, and package-specific chip enable behavior in DFN5 and WLCSP variants.

Technical Context

This EEPROM implements a standard I²C target protocol with start/stop detection, ACK/NACK handshaking, and addressable memory mapping using 7-bit device select codes where E2/E1/E0 pins define the three LSBs. It supports both random and sequential read modes, with internal address counter auto-increment and wraparound at memory boundary.

The device integrates on-chip high-voltage generation for write operations, ECC logic (in process-letter A/K variants) correcting single-bit errors per 4-byte group, and a power-on reset circuit that prevents spurious writes during VCC ramp-up. Write control (WC) disables all data writes when high, while chip enable (E2–E0) allows up to eight devices on the same bus.

Key Specifications

Pinout & Package

Package: UFDFPN5 (DFN5, 1.7 mm × 1.4 mm, 5-pin, ECOPACK2). E2, E1, and E0 pins are not accessible and internally pulled low (000), fixing device address to 1010000x in memory array access and 1011000x for identification page access.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C128C and BR24G128FJ, M24128-BWDW6TP uniquely combines hardware WC-based write inhibition, 64-byte page optimization for embedded control, and identification page support - making it optimal for safety-critical or credential-sensitive deployments where deterministic protection and parameter immutability are design requirements.

Availability

M24128-BWDW6TP is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, medical device configuration, and automotive body control modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for M24128-BWDW6TP 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 analog, microcontroller, power, and memory solutions for industrial, automotive, and consumer markets.

The M24 series EEPROMs are engineered for robustness in mission-critical embedded systems, emphasizing voltage flexibility, I²C interoperability, and long-term data integrity - targeting applications where firmware resilience and parameter persistence cannot be compromised.

FAQ

What is the function of the WC pin on M24128-BWDW6TP?

The WC (Write Control) pin is an active-high hardware lock: when driven high, it disables all write operations (byte, page, and identification page writes), causing the device to return NO ACK for data bytes. When low or floating, writes are enabled. This provides deterministic, glitch-immune protection independent of firmware state.

Does M24128-BWDW6TP support the identification page feature?

No - M24128-BWDW6TP is a BW-suffix variant and does not include the 64-byte identification page. That feature is exclusive to M24128-D variants (e.g., M24128-DF, M24128-DW). The BW part supports only the main 128-Kbit memory array with hardware write protection via WC.

Can M24128-BWDW6TP operate at 1.6 V?

No - M24128-BWDW6TP is specified for 1.7 V to 5.5 V across –40 °C to +85 °C. Only BF and DF suffix variants support 1.6 V operation under restricted conditions (0 °C to +85 °C only). Using 1.6 V risks undervoltage reset failure and incomplete write cycles.

How does the DFN5 package affect chip enable addressing?

In the UFDFPN5 (DFN5) package, E2, E1, and E0 pins are not bonded out and internally read as logic low (000). Therefore, the device select code must always use 1010000x for memory access and 1011000x for identification page access - eliminating address conflict but preventing multi-device bus sharing via E-pin configuration.