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STMicroelectronics M24256-BWMN6TP/A
- Part No.:
- M24256-BWMN6TP/A
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M24256-BWMN6TP/A.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,821
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Product details
Overview
M24256-BWMN6TP/A from STMicroelectronics is a 256-Kbit I²C-compatible serial EEPROM organized as 32 K × 8 bits, operating from 2.5 V to 5.5 V supply with 1 MHz max clock speed. It features 64-byte page write, hardware write protection via WC pin, and enhanced ESD/latch-up immunity. Used in industrial control modules for parameter storage and calibration data retention.
For engineers reviewing the M24256-BWMN6TP/A datasheet, M24256-BWMN6TP/A pinout, M24256-BWMN6TP/A application, or M24256-BWMN6TP/A equivalent, key selection criteria include I²C bus timing compatibility (100 kHz/400 kHz/1 MHz), TSSOP8 package footprint, full-array write lock capability, and 4 million write cycle endurance at -40 °C to +85 °C.
Technical Context
The device implements a slave-only I²C interface with fixed 7-bit device address prefix (1010xxxR/W) decoded against E2–E0 chip enable inputs. Internal ECC logic operates transparently across groups of four consecutive bytes to correct single-bit read errors without software intervention.
Write control (WC) pin enables hardware-level memory lockdown: when driven high, all write operations-including byte, page, and identification page writes-are inhibited regardless of address or instruction sequence. The internal address counter auto-increments after each read or write, supporting seamless sequential access across 32 Kbyte boundary with roll-over behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32 K × 8 bits) - provides sufficient nonvolatile storage for firmware configuration, sensor calibration tables, and device identity data. |
| I²C clock frequency | Up to 1 MHz - supports high-speed parameter updates in real-time systems without requiring protocol translation or buffering. |
| Supply voltage range | 2.5 V to 5.5 V - compatible with legacy 3.3 V and 5 V microcontroller I/O domains without level-shifting circuitry. |
| Page write time | ≤5 ms - enables rapid bulk parameter updates (e.g., 64-byte calibration set) with deterministic latency for time-critical applications. |
| Data retention | 200 years - ensures long-term reliability of stored settings across product lifecycle without refresh cycles. |
| Endurance | 4 million write cycles - supports frequent field recalibration or logging in industrial monitoring equipment. |
| Operating temperature | -40 °C to +85 °C - qualified for deployment in uncontrolled environments such as factory-floor PLCs and outdoor metering units. |
Pinout & Package
Package: TSSOP8 (DW), 169 mil width, RoHS-compliant ECOPACK2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E2) | Chip enable input | Third LSB of 3-bit device address; tied high/low to configure unique I²C address among multiple EEPROMs on same bus. |
| 2 (E1) | Chip enable input | Second LSB of device address; enables up to eight M24256 devices sharing one I²C bus with distinct select codes. |
| 3 (E0) | Chip enable input | LSB of device address; floating defaults to logic low, allowing minimal external component count for single-device designs. |
| 4 (VSS) | Ground reference | Return path for all internal logic and I/O; requires local 10–100 nF decoupling capacitor adjacent to pin for noise immunity. |
| 5 (SCL) | Serial clock input | Master-generated clock signal synchronizing all data transfers; open-drain compatible with standard I²C pull-up resistor networks. |
| 6 (SDA) | Serial data I/O | Open-drain bidirectional line for address/data transfer; must be pulled up externally; supports wire-OR with other I²C slaves. |
| 7 (WC) | Write control input | Hardware write lock: high = full memory array write-inhibited; low or floating = write enabled; no software dependency. |
| 8 (VCC) | Supply voltage | Power rail for core logic and I/O drivers; stable DC required before any I²C transaction; internal POR prevents spurious writes during power ramp. |
Key Features
| Feature | Design Value |
|---|---|
| ECOPACK2 packaging | RoHS-compliant and halogen-free TSSOP8 footprint enabling drop-in replacement in existing PCB layouts while meeting environmental compliance mandates. |
| Hardware write protection | Dedicated WC pin allows system-level lockout of EEPROM writes independent of firmware state-critical for preventing corruption during brown-out or reset events. |
| ECC error correction | Single-bit error correction per 4-byte group improves long-term read reliability without software overhead or memory overhead penalties. |
| Identification page (M24256-D variant only) | 64-byte dedicated page for secure storage of sensitive parameters (e.g., cryptographic keys, calibration coefficients), permanently lockable to read-only mode. |
| Polling-ready ACK response | Supports efficient write completion detection via repeated device-select polling-eliminates fixed timeout delays and improves system responsiveness. |
Applications
| Industrial Sensor Calibration | Smart Meter Firmware Storage |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter repository accessed via I²C during power-up initialization and runtime reconfiguration. Use Value: Enables field-replaceable sensor modules with self-contained calibration data, eliminating host MCU dependency for coefficient management. |
Use Scenario: Retaining tariff schedules, billing counters, and communication module credentials in utility-grade electricity meters. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage element interfaced to metrology SoC over isolated I²C bus. Use Value: Guarantees 200-year data integrity and 4M-cycle endurance under daily firmware update cycles and power-loss conditions. |
| Medical Device Configuration | Automotive Body Control Module |
|
Use Scenario: Holding user-defined therapy parameters and safety thresholds in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Fail-safe configuration store with hardware write lock (WC pin) activated during clinical operation. Use Value: Prevents accidental overwrite of critical treatment settings during active use-complies with IEC 62304 Class B software requirements. |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock configurations in vehicle body control units. IC Role / Device Role / Timing Role: Low-power EEPROM accessed during ignition-on initialization and infrequent user setting changes. Use Value: Operates reliably across -40 °C to +85 °C ambient range and withstands automotive load-dump transients via integrated ESD protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256-SSHL-T (Microchip) | 256 Kbit I²C EEPROM; 1.7–5.5 V supply; no WC pin; uses software write protect (WP bit in status register). | Lacks hardware-level write lock; requires firmware coordination to prevent inadvertent writes during power transitions. | Select when system already implements robust software-based protection and board space permits larger SOIC-8 footprint. |
| BR24G256FJ-WE2 (ROHM) | 256 Kbit I²C EEPROM; 1.7–5.5 V; includes WC pin; rated for -40 °C to +105 °C; smaller UFDFPN8 package. | Extended temperature rating suits under-hood automotive use; DFN8 footprint reduces PCB area by ~40% vs. TSSOP8. | Select for high-temp environments or space-constrained designs where TSSOP8 mounting is impractical. |
Compared with AT24C256-SSHL-T and BR24G256FJ-WE2, the M24256-BWMN6TP/A offers deterministic hardware write lock without firmware involvement and proven 2.5–5.5 V operation-ideal for industrial systems where power stability cannot be guaranteed.
Availability
M24256-BWMN6TP/A 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 across extended temperature ranges and long production lifecycles.
Supply support for M24256-BWMN6TP/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, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and memory products for industrial, automotive, and consumer markets.
The M24256 belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, I²C-based nonvolatile storage in harsh environments where data integrity and long-term reliability are mission-critical.
FAQ
What is the function of the WC pin on M24256-BWMN6TP/A?
The WC (Write Control) pin is a hardware-level write protection input. When driven high, it disables all write operations-including byte, page, and identification page writes-regardless of I²C command or address. This prevents corruption during power instability or firmware faults. WC is active-low logic: low or floating enables writes; high inhibits them. No software register controls this function.
Does M24256-BWMN6TP/A support 1 MHz I²C operation across its full voltage range?
Yes. The M24256-BWMN6TP/A supports up to 1 MHz I²C clock frequency across its entire specified supply range of 2.5 V to 5.5 V. This is confirmed in Section 1 of DS1766 Rev 35, which states "1 MHz clock from 1.7 V to 5.5 V" for the M24256-BF/DF variants-and explicitly confirms 2.5–5.5 V operation for the M24256-BW series including this part. Timing parameters (tBUF, tHD:STA, etc.) are fully characterized at 1 MHz in the AC characteristics table.
Can M24256-BWMN6TP/A be used in place of M24256-BW without design changes?
Yes. M24256-BWMN6TP/A is the tape-and-reel packaged version of the M24256-BW in TSSOP8 (DW) package with ECOPACK2 compliance. The "MN6TP/A" suffix denotes packaging and environmental compliance-not functional differentiation. Electrical specifications, pinout, timing, and instruction set are identical to base M24256-BW. No schematic or layout changes are required for substitution.
Is the identification page feature available on M24256-BWMN6TP/A?
No. The identification page (64-byte additional page with permanent lock capability) is exclusive to M24256-D order codes (e.g., M24256-DR, M24256-DF). The M24256-BW series-including M24256-BWMN6TP/A-lacks this feature. Only standard 32 Kbyte memory array is present. Device select code for M24256-BW uses 1010xxxR/W prefix; M24256-D uses 1011xxxR/W for ID page access, which this part does not respond to.
M24256-BWMN6TP/A 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
M24256-BWMN6TP/A FAQ
1.How can I place an order for M24256-BWMN6TP/A through Aetrix?
Please submit a Request for Quotation (RFQ) for M24256-BWMN6TP/A 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 M24256-BWMN6TP/A reliable?
The price and inventory of M24256-BWMN6TP/A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M24256-BWMN6TP/A is usually 5 days.
3.What payment methods are accepted for M24256-BWMN6TP/A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M24256-BWMN6TP/A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M24256-BWMN6TP/A?
M24256-BWMN6TP/A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M24256-BWMN6TP/A 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 M24256-BWMN6TP/A?
For technical support, including M24256-BWMN6TP/A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M24256-BWMN6TP/A requirements.
6.How does Aetrix verify that M24256-BWMN6TP/A is sourced from the original manufacturer or authorized distributors?
All M24256-BWMN6TP/A 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 M24256-BWMN6TP/A meets industry standards.
7.What is the process for return or replacement of M24256-BWMN6TP/A?
All M24256-BWMN6TP/A units undergo pre-shipment inspection (PSI). If there is an issue with M24256-BWMN6TP/A, 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 M24256-BWMN6TP/A part is unused and in its original packaging.
Return procedure for M24256-BWMN6TP/A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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