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Microchip Technology 24CS256T-E/MS
- Part No.:
- 24CS256T-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
24CS256T-E/MS.pdf
- Description:
- IC EEPROM 256KBIT I2C 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,949
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Product details
Overview
24CS256T-E/MS from Microchip Technology is a 256-Kbit I²C serial EEPROM organized as 32,768 × 8-bit, supporting byte/page writes (up to 64 bytes), 3.4 MHz High-Speed I²C mode, and built-in ECC for single-bit error correction. It operates from 1.7V to 5.5V and is AEC-Q100 qualified for automotive use.
For engineers reviewing the 24CS256T-E/MS datasheet, 24CS256T-E/MS pinout, 24CS256T-E/MS application, or 24CS256T-E/MS equivalent, key selection considerations include its 128-bit factory-unique serial number, dual write-protection modes (hardware WP pin + software-configurable zone protection), extended temperature range (–40°C to +125°C), and wettable flank VDFN-8 package compatibility with automated optical inspection.
Technical Context
The 24CS256T-E/MS implements a two-wire I²C interface with Schmitt-trigger inputs, slope-controlled outputs, and programmable high-speed mode (3.4 MHz at VCC ≥2.5V). Its memory architecture includes a 256-Kbit main array and a separate 1-Kbit Security register containing a read-only 128-bit serial number and a user-programmable, lockable 64-byte ID page.
Device operation is governed by three dedicated registers: Configuration register (enabling enhanced software write protection per 32-Kbit zone), Security register (with hardware-locked and software-lockable sections), and Manufacturer ID register (24-bit I²C-compliant identifier). Built-in ECC corrects up to one bit per four-byte read, with an Error Correction State (ECS) latch indicating correction events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8-bit), internally organized in 512 pages of 64 bytes each |
| I²C Speed Modes | Supports 100 kHz, 400 kHz, 1 MHz, and 3.4 MHz High-Speed mode (VCC ≥2.5V, industrial temp) |
| Write Cycle Time | ≤5 ms maximum self-timed write cycle for byte or page operations |
| Operating Voltage | 1.7V to 5.5V - enables direct interfacing with 1.8V, 2.5V, 3.3V, and 5V microcontrollers without level shifters |
| Temperature Range | Extended (E): –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood automotive applications |
| Endurance & Retention | 1 million erase/write cycles; >200 years data retention at 55°C - validated for long-life embedded storage |
| Security Features | Factory-programmed 128-bit globally unique serial number + user-programmable, permanently lockable 64-byte ID page |
Pinout & Package
24CS256T-E/MS is packaged in an 8-lead wettable flank VDFN (Very Thin Dual Flat No-lead) with exposed pad, optimized for automated optical inspection (AOI) and high-reliability solder joint formation in automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware Device Address Input | LSB of 3-bit client address; hardwired to VSS or VCC to enable up to eight devices on same I²C bus |
| A1 | Hardware Device Address Input | Middle bit of 3-bit client address; determines unique I²C slave address alongside A0 and A2 |
| A2 | Hardware Device Address Input | MSB of 3-bit client address; required to be logic '0' in SOT-23 variant but fully functional in VDFN-8 |
| VSS | Ground Reference | Primary return path for all internal circuitry; exposed pad may be connected to VSS for thermal and EMI performance |
| SDA | Serial Data Bidirectional Line | Open-drain I²C data line requiring external pull-up; supports clock stretching and ACK/NACK signaling |
| SCL | Serial Clock Input | Master-generated clock input with Schmitt-trigger input for noise immunity; slope control minimizes ground bounce |
| WP | Hardware Write-Protect Control | Active-high pin that disables all writes to main array and Security register when driven to VCC |
| VCC | Power Supply Input | Single supply rail (1.7–5.5V); powers internal logic, EEPROM cell programming, and I/O buffers |
Key Features
| Feature | Design Value |
|---|---|
| 128-bit Factory-Unique Serial Number | Read-only, globally unique identifier preprogrammed at wafer level - eliminates manufacturing serialization overhead |
| Enhanced Software Write Protection | Configurable via Configuration register to protect any of eight independent 32-Kbit zones - enables granular firmware/data partitioning |
| Built-in ECC Logic | Corrects single-bit errors per 4-byte readout and latches error occurrence in ECS register - improves system-level data integrity without host intervention |
| I²C Manufacturer ID Support | Returns device-specific 24-bit value on reserved host code command - enables runtime identification in multi-vendor I²C systems |
| Low-Power Operation | 1 µA standby current (I-temp), 3.0 mA max write current at 5.5V - suitable for battery-backed and energy-constrained nodes |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing calibrated sensor offsets, actuator trim values, and vehicle-specific configuration parameters across power cycles in door modules and lighting controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage IC with AEC-Q100 qualification and extended temperature support for under-dash mounting. Use Value: Factory-programmed 128-bit serial number enables secure vehicle identity binding; ECC ensures integrity of safety-critical calibration data. |
Use Scenario: Retaining I/O mapping tables, PID tuning constants, and firmware update metadata in modular automation controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Robust serial EEPROM with 1M endurance and >200-year data retention - deployed where field maintenance intervals exceed 10 years. Use Value: Enhanced software write protection allows locking of critical firmware parameters while permitting runtime updates to operational logs and counters. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Vault |
Use Scenario: Securely storing dose calibration coefficients, usage history, and regulatory audit logs in Class II medical devices requiring traceability and tamper resistance. IC Role / Device Role / Timing Role: Trusted nonvolatile memory with lockable 64-byte ID page for storing cryptographic keys or device certificates. Use Value: User-programmable, permanently lockable Security register section prevents unauthorized modification of calibration-critical data post-certification. |
Use Scenario: Holding metrology firmware signatures, tariff tables, and secure boot keys in ANSI C12.22-compliant smart meters deployed in outdoor utility cabinets. IC Role / Device Role / Timing Role: High-reliability EEPROM with RoHS compliance and 125°C extended temperature rating for uncooled outdoor enclosures. Use Value: Dual write-protection modes (WP pin + software zone locks) ensure firmware integrity against both electrical faults and malicious reprogramming attempts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256C-SSHL-T | No built-in ECC; no 128-bit serial number; only basic hardware WP pin protection; 1 MHz max I²C speed | Lacks security and reliability features needed for automotive or medical use; limited to cost-sensitive consumer applications | Select only if ECC, serialization, and AEC-Q100 qualification are unnecessary and BOM cost is primary constraint |
| 24AA256-I/MS | Same pinout and basic functionality but no Security register, no ECC, no Manufacturer ID support, and only industrial (–40°C to +85°C) temp grade | Not qualified for extended temperature or automotive use; lacks hardware-assisted security features required for regulated markets | Acceptable for industrial control boards where extended temp and cryptographic traceability are not mandated |
Compared with AT24C256C-SSHL-T and 24AA256-I/MS, the 24CS256T-E/MS delivers differentiated value through factory-serialized identity, ECC-enabled data integrity, and AEC-Q100 qualification - making it the only option among the three suitable for safety-critical automotive and medical deployments.
Availability
24CS256T-E/MS is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, medical infusion pumps, and smart energy metering requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for 24CS256T-E/MS 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
Microchip Technology Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, serving automotive, industrial, communications, and consumer markets with vertically integrated silicon and software platforms.
The 24CS256 belongs to Microchip's CS-series serial EEPROM family, designed specifically for applications demanding enhanced security, extended temperature operation, and automotive-grade reliability - including serialized identity, ECC, and AEC-Q100 qualification.
FAQ
What is the package type of the 24CS256T-E/MS?
The 24CS256T-E/MS uses an 8-lead wettable flank VDFN (Very Thin Dual Flat No-lead) package with exposed thermal pad. This package supports automated optical inspection (AOI) and provides superior solder joint reliability for automotive and industrial applications requiring high thermal and mechanical robustness.
Does the 24CS256T-E/MS support High-Speed I²C mode?
Yes, the 24CS256T-E/MS supports High-Speed I²C mode up to 3.4 MHz when VCC is ≥2.5V and operating within the industrial temperature range. This enables faster firmware updates and configuration loading compared to standard 400 kHz or 1 MHz EEPROMs, reducing system boot time in time-sensitive applications.
How does the Security register in the 24CS256T-E/MS work?
The 24CS256T-E/MS Security register contains two sections: a read-only 128-bit factory-programmed serial number (bytes 0x0800–0x080F), and a user-programmable, lockable 64-byte ID page (bytes 0x0840–0x087F). Once locked via software sequence, the ID page becomes permanently read-only - ideal for storing cryptographic keys or calibration certificates.
What write protection options does the 24CS256T-E/MS offer?
The 24CS256T-E/MS offers dual write protection: hardware-based full-array protection via the WP pin, and software-configurable zone protection using the Configuration register. The latter allows locking of any of eight independent 32-Kbit zones - enabling selective firmware/data partitioning without affecting other memory regions.
Is the 24CS256T-E/MS AEC-Q100 qualified?
Yes, the 24CS256T-E/MS is AEC-Q100 qualified for Grade 1 (–40°C to +125°C), making it suitable for automotive applications including body control modules, infotainment systems, and ADAS-related subsystems where extended temperature operation and automotive reliability standards are mandatory.
24CS256T-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 400 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
24CS256T-E/MS FAQ
1.How can I place an order for 24CS256T-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 24CS256T-E/MS 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 24CS256T-E/MS reliable?
The price and inventory of 24CS256T-E/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24CS256T-E/MS is usually 5 days.
3.What payment methods are accepted for 24CS256T-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24CS256T-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24CS256T-E/MS?
24CS256T-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24CS256T-E/MS 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 24CS256T-E/MS?
For technical support, including 24CS256T-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24CS256T-E/MS requirements.
6.How does Aetrix verify that 24CS256T-E/MS is sourced from the original manufacturer or authorized distributors?
All 24CS256T-E/MS 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 24CS256T-E/MS meets industry standards.
7.What is the process for return or replacement of 24CS256T-E/MS?
All 24CS256T-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 24CS256T-E/MS, 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 24CS256T-E/MS part is unused and in its original packaging.
Return procedure for 24CS256T-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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