Specifications
| Attribute | Value |
| Supplier | STMicroelectronics |
| Package / Case | Tape & Reel (TR),Cut Tape (CT) |
| Part Status | Active |
| Memory Type | Non-Volatile |
| Memory Format | EEPROM |
| Technology | EEPROM |
| Memory Size | 256Kb (32K x 8) |
| Memory Interface | I²C |
| Clock Frequency | 1 MHz |
| Write Cycle Time - Word Page | 5ms |
| Access Time | 450 ns |
| Voltage - Supply | 1.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
Overview
Description
M24256-DFMN6TP is a 256-kilobit serial EEPROM memory IC used for non-volatile data storage in embedded systems. It provides byte-addressable read/write with support for page writes and is typically accessed over an I2C-compatible serial bus. The device is organized as about 32K × 8 (32K bytes) of memory, enabling storage of configuration data, calibration constants, small logs, and similar data. It comes in an 8-pin package suitable for cost-sensitive, low-pin-count designs. Address pins on the package allow multiple devices on the same I2C bus. Temperature and voltage ranges, timing parameters, and the exact package variant depend on the manufacturer revision; consult the official datasheet for precise specifications, pinout, and operating conditions.
Equivalent
Equivalent products (256-Kbit I2C serial EEPROM) from other vendors:
- ST: M24C256-W (and M24C256 family)
- Microchip: 24LC256 / 24C256
- NXP: CAT24C256
- Fujitsu: FM24C256
These are direct 2-wire I2C memory replacements with similar capacity and timing.
- ST: M24C256-W (and M24C256 family)
- Microchip: 24LC256 / 24C256
- NXP: CAT24C256
- Fujitsu: FM24C256
These are direct 2-wire I2C memory replacements with similar capacity and timing.
Pinout
- Pin count: 6 pins
- Function: 256-kbit I2C (two-wire) serial EEPROM (M24256). Provides non-volatile storage accessible via I2C with SCL and SDA; includes VCC, GND, and Write Protect (WP). The remaining DFN-6 pin is typically No Connect (NC) on this variant.
- Function: 256-kbit I2C (two-wire) serial EEPROM (M24256). Provides non-volatile storage accessible via I2C with SCL and SDA; includes VCC, GND, and Write Protect (WP). The remaining DFN-6 pin is typically No Connect (NC) on this variant.
Manufacturer
Manufacturer: Fudan Microelectronics Group Co., Ltd. (Fudan Microelectronics).
What kind of company: A Chinese semiconductor company that designs and manufactures memory ICs (non-volatile memory, EEPROM/Flash/FRAM, RAM and related ICs) for wide commercial and industrial use.
What kind of company: A Chinese semiconductor company that designs and manufactures memory ICs (non-volatile memory, EEPROM/Flash/FRAM, RAM and related ICs) for wide commercial and industrial use.
Application
Typical applications for the M24256-DFMN6TP are as a compact serial non-volatile memory for MCU-based systems. It stores firmware code or boot loaders, calibration data and device configurations, and data logging buffers. It supports look‑up tables and parameter storage that must survive power cycles. Its small DFN6 package suits space‑constrained designs and enables use in consumer electronics, IoT sensors, wearables, automotive and industrial controllers, medical devices, routers, and other embedded systems requiring reliable nonvolatile memory with a low pin count.
Package
DFN-6 package (6-pin dual-flat-no-lead).
