My Inquiry
My Account
STMicroelectronics M24256E-FMH6TG
- Part No.:
- M24256E-FMH6TG
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 5-UFDFN
- Datasheet:
-
M24256E-FMH6TG.pdf
- Description:
- IC EEPROM 256KBIT I2C 5UFDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,305
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
M24256E-FMH6TG from STMicroelectronics is a 256-Kbit (32-Kbyte) I²C-compatible serial EEPROM organized as 32 K × 8 bits, featuring configurable and preprogrammed device address support, 64-byte identification page, hardware write protection via WC pin, and operation across 1.6 V–5.5 V supply at -40 °C to +85 °C. It serves as nonvolatile configuration storage in industrial controllers, automotive body modules, and smart metering systems requiring field-updatable calibration data.
For engineers reviewing the M24256E-FMH6TG datasheet, M24256E-FMH6TG pinout, M24256E-FMH6TG application, or M24256E-FMH6TG equivalent, key selection criteria include I²C Fast-mode Plus (1 MHz) compatibility, 5 ms typical byte/page write time, 4 million write cycles, 200-year data retention, and dual protection modes (WC pin + DAL bit lock).
Technical Context
The device implements a standard I²C target protocol with start/stop detection, ACK/NACK handshaking, and 7-bit slave addressing extended by three configurable C2–C0 bits. Its internal architecture includes a high-voltage generator for EEPROM programming, ECC-enabled sense amplifiers, and separate latches for memory array, ID page, and CDA register access.
Write control is enforced at two levels: hardware-level inhibition when WC = HIGH, and software-level permanent lock via DAL bit = 1 in the CDA register. The 64-byte identification page supports independent read/write and one-time permanent lock to prevent tampering of calibration or security parameters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32 K × 8), enabling storage of firmware patches or multi-sensor calibration tables in compact embedded nodes. |
| I²C speed modes | Supports Standard-mode (100 kHz), Fast-mode (400 kHz), and Fast-mode Plus (1 MHz), allowing integration into high-throughput sensor hubs without bus bottlenecks. |
| Page size | 64-byte page write capability reduces transaction overhead versus byte-write-only EEPROMs, cutting firmware update time by up to 95% for block writes. |
| Write endurance | 4 million write cycles ensures reliable logging in data-logger applications operating continuously for >10 years at 100 writes/day. |
| Data retention | 200-year retention at +25 °C enables long-life deployment in infrastructure equipment where field replacement is impractical. |
| Supply voltage range | 1.6 V to 5.5 V operation supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level-shifting circuitry. |
| Standby current | 310 nA typical enables always-on battery-backed storage in energy-harvesting IoT endpoints with multi-year shelf life. |
Pinout & Package
Package: UFDFPN8 (2 mm × 3 mm, ECOPACK2-compliant, 0.5 mm pitch). This ultra-compact 8-pin DFN package supports automated optical inspection and high-density PCB layouts in space-constrained modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDA) | Serial Data I/O | Open-drain bidirectional line for I²C data transfer; requires external pull-up resistor; supports wired-AND with other I²C targets. |
| 2 (VSS) | Ground Reference | Primary return path for VCC; must be low-impedance and decoupled locally with 10–100 nF capacitor to suppress switching noise. |
| 3 (SCL) | Serial Clock Input | Asynchronous clock input from master; timing-critical path-requires controlled trace length and impedance matching for >400 kHz operation. |
| 4 (WC) | Hardware Write Control | Active-HIGH inhibit signal: disables all write operations (memory, ID page, CDA register) when asserted; floats or LOW to enable writes. |
| 5 (VCC) | Supply Voltage | Power input for core logic and EEPROM array; valid range 1.6–5.5 V; internal POR ensures safe reset during power ramp. |
| 6–8 (NC) | No Connect | Unbonded pins in UFDFPN8 package; must remain unconnected and unpopulated on PCB to avoid parasitic coupling or ESD paths. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable Device Address (CDA) Register | 8-bit register with C2/C1/C0 bits enabling up to eight unique I²C addresses on same bus; DAL bit allows irreversible lock to prevent accidental reconfiguration. |
| 64-byte Identification Page | Dedicated, separately addressable memory page for storing sensitive parameters (e.g., calibration coefficients, cryptographic keys); supports one-time permanent read-only lock. |
| Hardware + Software Write Protection | WC pin provides board-level physical write disable; DAL bit enforces firmware-level permanent lock-dual-layer protection against unintended or malicious overwrites. |
| Fast Wake-up Time | <5 μs wake-up from standby enables immediate response to I²C START condition, eliminating latency in real-time configuration reads. |
| Enhanced Reliability | ESD rating ≥4 kV HBM and latch-up immunity per JESD78 ensure robustness in industrial environments with frequent hot-plug or electrostatic events. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Storing channel-specific calibration offsets and fault history logs across 16+ analog input channels in modular PLC backplanes. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed write integrity during brown-out events and hot-swap insertion. Use Value: Enables field recalibration without firmware reflashing; WC pin prevents corruption during live maintenance; 200-year retention eliminates scheduled EEPROM replacement. |
Use Scenario: Holding seat position memory, mirror angle presets, and door lock configuration in BCMs across vehicle production lifecycles. IC Role / Device Role / Timing Role: Secure parameter storage with DAL-locked CDA register ensuring consistent I²C address assignment across model years. Use Value: Preprogrammed address (M24256E-Fxx6T4) avoids bus conflicts in multi-EEPROM BCM designs; 1.6 V operation supports stop-start battery voltage dips. |
| Smart Electricity Meters | Medical Infusion Pumps |
|
Use Scenario: Recording tariff schedules, meter firmware version, and tamper-event timestamps in ANSI C12.22-compliant meters deployed for 20+ years. IC Role / Device Role / Timing Role: Long-term data logger with write endurance sufficient for daily billing cycle writes over full service life. Use Value: 4 million write cycles exceed ANSI requirement of 100,000; 310 nA standby current extends battery backup to >10 years in metrology IC sleep mode. |
Use Scenario: Storing drug library profiles, dose limits, and user audit trails in FDA Class II infusion pumps requiring traceable parameter history. IC Role / Device Role / Timing Role: Secure configuration vault with locked ID page preventing unauthorized modification of safety-critical dosing parameters. Use Value: One-time ID page lock ensures immutable record of initial calibration; ECC-enabled reads guarantee data integrity for audit compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256B-SSHL-T (Microchip) | 256 Kbit I²C EEPROM; no CDA register or ID page; max 1 MHz only at 2.5–5.5 V; no WC pin-relies on software write protect. | Lacks hardware write inhibit and configurable addressing-unsuitable for multi-device I²C buses or safety-critical write-lock requirements. | Select when cost sensitivity outweighs need for dual-layer protection and flexible addressing; verify 1.6 V operation not required. |
| BR24G256FJ-3GE2 (ROHM) | 256 Kbit I²C EEPROM; includes WC pin and 1.7–5.5 V range; no CDA register or ID page; 1 MHz support only above 2.2 V. | Missing configurable address and dedicated ID page limits use in complex multi-node systems requiring secure parameter partitioning. | Choose for basic write-protected storage where board-level WC control suffices and address collision risk is managed externally. |
Compared with AT24C256B and BR24G256FJ, the M24256E-FMH6TG uniquely combines hardware write control, software-lockable CDA register, and isolated ID page-enabling secure, scalable, and long-life configuration management unattainable with alternatives.
Availability
M24256E-FMH6TG is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device manufacturing requiring stable component supply, long-term lifecycle assurance, and ECOPACK2 environmental compliance.
Supply support for M24256E-FMH6TG 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 automotive, industrial, and power management solutions with strong IP in nonvolatile memory and embedded control.
This device belongs to ST's M24 serial EEPROM product line, engineered for high-reliability, low-power, and secure configuration storage in mission-critical embedded systems where data integrity and long-term availability are mandatory.
FAQ
What is the function of the WC pin on M24256E-FMH6TG?
The WC (Write Control) pin is an active-HIGH hardware inhibit signal that globally disables all write operations-including memory array, identification page, and configurable device address register writes-when driven HIGH. When left floating or pulled LOW, writes are enabled subject to software-level protections like DAL bit status. This provides board-level safeguard against accidental overwrites during power transients or firmware errors.
Can the identification page be permanently locked after programming?
Yes-the 64-byte identification page supports one-time permanent lock to read-only mode via a dedicated I²C command. Once locked, subsequent write attempts to this page generate NO ACK and leave contents unchanged. This ensures immutability of critical parameters such as calibration data or security keys, meeting functional safety requirements in medical and industrial applications.
How does the configurable device address (CDA) register work?
The CDA register is an 8-bit on-chip register where bits b3–b1 (C2/C1/C0) define three LSBs of the I²C slave address, enabling up to eight unique addresses on the same bus. Bit b0 (DAL) acts as a permanent lock: when set to 1, the entire register becomes read-only. Factory-default value is 00000000; preprogrammed variants ship with DAL = 1 and C2/C1/C0 set per Table 4.
What package variants are offered for M24256E-FMH6TG?
M24256E-FMH6TG is specifically packaged in UFDFPN8 (2 mm × 3 mm, 0.5 mm pitch, ECOPACK2-compliant). Other variants of the M24256E-F family include SO8N, TSSOP8, and UFDFPN5-but the MH6TG suffix denotes the UFDFPN8 variant with tape-and-reel packaging and industrial temperature grade (-40 °C to +85 °C).
M24256E-FMH6TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 5-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-UFDFPN (1.7x1.4)
M24256E-FMH6TG FAQ
1.How can I place an order for M24256E-FMH6TG through Aetrix?
Please submit a Request for Quotation (RFQ) for M24256E-FMH6TG 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-FMH6TG reliable?
The price and inventory of M24256E-FMH6TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M24256E-FMH6TG is usually 5 days.
3.What payment methods are accepted for M24256E-FMH6TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M24256E-FMH6TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M24256E-FMH6TG?
M24256E-FMH6TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M24256E-FMH6TG 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-FMH6TG?
For technical support, including M24256E-FMH6TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M24256E-FMH6TG requirements.
6.How does Aetrix verify that M24256E-FMH6TG is sourced from the original manufacturer or authorized distributors?
All M24256E-FMH6TG 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-FMH6TG meets industry standards.
7.What is the process for return or replacement of M24256E-FMH6TG?
All M24256E-FMH6TG units undergo pre-shipment inspection (PSI). If there is an issue with M24256E-FMH6TG, 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-FMH6TG part is unused and in its original packaging.
Return procedure for M24256E-FMH6TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M24256E-FMH6TG 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…
