My Inquiry
My Account
STMicroelectronics M24256E-FMN6TP
- Part No.:
- M24256E-FMN6TP
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M24256E-FMN6TP.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,703
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
M24256E-FMN6TP from STMicroelectronics is a 256-Kbit (32-Kbyte) I²C-compatible EEPROM organized as 32 K × 8 bits, featuring configurable and preprogrammed device addressing, hardware write protection via WC pin, and operation across 1.6 V–5.5 V supply. It supports Fast-mode Plus (1 MHz), Fast-mode (400 kHz), and Standard-mode (100 kHz) I²C bus speeds, with 64-byte page writes completing in ≤5 ms (typ. 3.2 ms), and is deployed in industrial control modules for parameter storage and calibration data retention.
For engineers reviewing the M24256E-FMN6TP datasheet, M24256E-FMN6TP pinout, M24256E-FMN6TP application, or M24256E-FMN6TP equivalent, key selection considerations include its dual write-protection mechanisms (WC pin + DAL bit), 64-byte identification page with permanent lock capability, 4M+ write endurance, and ECOPACK2-compliant SO8N/TSSOP8/UFDFPN8/UFDFPN5 packaging options.
Technical Context
The device implements a dedicated I²C target interface with open-drain SDA and input SCL, requiring external pull-up resistors. Its internal architecture includes a high-voltage generator, ECC-enabled sense amplifiers, and a sequencer supporting byte/page read/write, CDA register access, and identification page operations-all governed by start/stop condition detection and ACK/NACK protocol compliance.
Write control is enforced at two levels: hardware via the WC pin (high = full array + CDA register write disable) and software via the DAL bit (DAL=1 = irreversible CDA freeze). The configurable device address (C2:C0) enables up to eight unique I²C addresses on a shared bus, while the 64-byte ID page supports secure storage of calibration constants or firmware metadata that can be permanently locked to read-only mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32 K × 8 bits) - supports firmware configuration storage without external memory expansion. |
| I²C speed modes | 1 MHz (Fast-mode Plus), 400 kHz (Fast-mode), 100 kHz (Standard-mode) - enables interoperability with legacy and high-speed controllers. |
| Page size | 64 bytes - allows efficient bulk parameter updates (e.g., sensor calibration tables) in ≤5 ms per page. |
| Supply voltage | 1.6 V to 5.5 V - compatible with 1.8 V, 3.3 V, and 5 V logic domains without level-shifting. |
| Data retention | >200 years - ensures long-term reliability for infrequently updated system parameters in unpowered storage. |
| Write endurance | >4 million cycles - supports frequent recalibration or logging in industrial monitoring applications. |
| Standby current | 310 nA (typ.) - minimizes power draw in battery-backed systems during idle periods. |
Pinout & Package
Package: SO8N (150 mil width), TSSOP8 (169 mil width), UFDFPN8 (2 × 3 mm), or UFDFPN5 (1.7 × 1.4 mm); all ECOPACK2-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA | Serial data I/O | Open-drain bidirectional bus line; requires external pull-up; supports wired-AND with other I²C devices. |
| SCL | Serial clock input | Master-generated clock synchronizing all data transfers; sampled on rising edge for input timing. |
| WC | Write control input | Hardware-level write protection: high = disables all writes to memory array and CDA register. |
| VCC | Supply voltage | 1.6–5.5 V operating range; decoupling capacitor (10–100 nF) required near pins for stable operation. |
| VSS | Ground reference | Return path for VCC; must be low-impedance to ensure noise immunity and POR circuit integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable device address (CDA) register | 8-bit register enabling software-defined I²C address (C2:C0) with irreversible lock (DAL bit) - eliminates address conflicts in multi-device systems. |
| 64-byte identification page | Dedicated nonvolatile space for calibration data or serial numbers, permanently lockable to read-only - prevents tampering of critical system metadata. |
| Hardware write protection (WC pin) | Active-high signal disabling all write operations regardless of CDA/DAL state - provides fail-safe protection during power transitions or firmware errors. |
| Fast wake-up time | <5 μs - enables rapid response after standby, critical for real-time parameter reads in interrupt-driven embedded systems. |
| Enhanced ESD/latch-up protection | Exceeds 4 kV HBM ESD and latch-up immunity per JESD78 - ensures robustness in industrial environments with electrical noise and transient surges. |
Applications
| Industrial PLC Configuration Storage | Smart Sensor Calibration Data Retention |
|---|---|
|
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers where firmware updates occur infrequently but field reconfiguration is routine. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed via I²C during boot or maintenance mode; no timing-critical operation required. Use Value: Enables field technicians to update operational parameters without firmware reflashing, leveraging 64-byte page writes for atomic calibration table updates. |
Use Scenario: Holding factory-calibrated offset/gain coefficients and temperature compensation curves in MEMS accelerometers and pressure sensors. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for sensor-specific constants; accessed once per power cycle during initialization. Use Value: The permanently lockable 64-byte identification page ensures calibration integrity across product lifetime, preventing accidental or malicious overwrite. |
| Medical Device Serial Number & Audit Log | Automotive Body Control Module Settings |
|
Use Scenario: Recording unique device identifiers, manufacturing dates, and firmware revision history in Class IIa medical instruments subject to regulatory traceability requirements. IC Role / Device Role / Timing Role: Read-once/write-rarely persistent storage; accessed during self-test and diagnostic reporting sequences. Use Value: 200+ year data retention and 4M+ write cycles support full product lifecycle traceability without replacement risk. |
Use Scenario: Storing user-configurable lighting profiles, window position memories, and seat adjustment presets in automotive BCMs. IC Role / Device Role / Timing Role: Low-power, high-reliability parameter store interfaced to microcontroller over 100 kHz I²C during vehicle startup or button-press events. Use Value: 310 nA standby current extends battery life in always-on modules; WC pin prevents corruption during ignition transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256B-PU | 256 Kbit I²C EEPROM; no WC pin; no CDA register; max 400 kHz clock; 1.8–5.5 V supply. | Lacks hardware write protection and configurable addressing - requires software-only safeguards and bus arbitration. | Select when board space permits larger DIP-8 package and system-level write control suffices. |
| BR24G256FJ-3GE2 | 256 Kbit I²C EEPROM; supports 1 MHz; includes WP pin (functionally similar to WC); no CDA register; 1.7–5.5 V. | Provides hardware write protection but no software-configurable I²C address - limits multi-device bus scalability. | Choose for high-speed 1 MHz operation with basic write protection where address flexibility is not required. |
Compared with AT24C256B-PU and BR24G256FJ-3GE2, the M24256E-FMN6TP uniquely combines 1 MHz I²C, dual-layer write protection (WC + DAL), and field-programmable addressing - making it optimal for dense, safety-critical, or upgradeable embedded systems where bus conflict avoidance and data integrity are design priorities.
Availability
M24256E-FMN6TP is available at Aetrix Electronics and suitable for industrial PLCs, smart sensors, medical instrumentation, and automotive body control modules requiring stable component supply, long-term data retention, and robust I²C interface compatibility.
Supply support for M24256E-FMN6TP 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, analog ICs, power management, and memory solutions for industrial, automotive, and consumer markets.
The M24256E-F series belongs to ST's serial EEPROM product line, engineered specifically for reliable, low-power, multi-voltage I²C-based parameter storage in harsh environments with stringent data integrity requirements.
FAQ
What is the function of the WC pin on the M24256E-FMN6TP?
The WC (Write Control) pin is an active-high hardware protection input that disables all write operations to both the main memory array and the configurable device address (CDA) register when driven high. This prevents accidental or transient-induced writes during power-up/down or system faults. When WC is low or floating, writes are enabled subject to software-level protections like the DAL bit. Its behavior is electrically defined and independent of I²C communication state.
Can the configurable device address be changed after factory programming?
Yes - if the device is delivered without preprogramming (i.e., default CDA register with DAL = 0), the C2/C1/C0 bits can be rewritten via the I²C interface using the "write configurable device address" instruction. However, setting DAL = 1 permanently locks the register, making further changes impossible. Devices ordered with preprogrammed addresses (e.g., M24256E-Fxx6T4) ship with DAL = 1 and read-only CDA registers.
How does the identification page differ from standard memory pages?
The 64-byte identification page is a dedicated, separately addressable memory region accessible only via specific I²C commands (device type identifier 1011). Unlike main memory, it supports permanent locking to read-only mode - once locked, write attempts return NO ACK and leave contents unchanged. It is intended for storing immutable data such as calibration coefficients, serial numbers, or security keys, and resides outside the 32-Kbyte main array address space.
What package variants does M24256E-FMN6TP correspond to?
The suffix "MN6TP" denotes the SO8N (150 mil width) package with ECOPACK2 environmental compliance. Other valid variants include "MW6TP" (TSSOP8), "MB6TP" (UFDFPN8), and "MC6TP" (UFDFPN5). All share identical electrical specifications and pinout mapping; only physical dimensions and thermal characteristics differ. Pin 1 location and marking conventions follow JEDEC standards for each respective package type.
M24256E-FMN6TP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 450 ns
- Voltage - Supply:
- 1.6V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
M24256E-FMN6TP FAQ
1.How can I place an order for M24256E-FMN6TP through Aetrix?
Please submit a Request for Quotation (RFQ) for M24256E-FMN6TP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for M24256E-FMN6TP reliable?
The price and inventory of M24256E-FMN6TP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M24256E-FMN6TP is usually 5 days.
3.What payment methods are accepted for M24256E-FMN6TP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M24256E-FMN6TP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M24256E-FMN6TP?
M24256E-FMN6TP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M24256E-FMN6TP order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for M24256E-FMN6TP?
For technical support, including M24256E-FMN6TP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M24256E-FMN6TP requirements.
6.How does Aetrix verify that M24256E-FMN6TP is sourced from the original manufacturer or authorized distributors?
All M24256E-FMN6TP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M24256E-FMN6TP meets industry standards.
7.What is the process for return or replacement of M24256E-FMN6TP?
All M24256E-FMN6TP units undergo pre-shipment inspection (PSI). If there is an issue with M24256E-FMN6TP, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The M24256E-FMN6TP part is unused and in its original packaging.
Return procedure for M24256E-FMN6TP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M24256E-FMN6TP Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
