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Microchip Technology 24CS256T-E/SN
- Part No.:
- 24CS256T-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24CS256T-E/SN.pdf
- Description:
- IC EEPROM 256KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,876
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Product details
Overview
24CS256T-E/SN from Microchip Technology is a 256-Kbit I²C serial EEPROM organized as 32,768 × 8-bit, supporting byte/page writes (up to 64 bytes), self-timed write cycles (≤5 ms), and high-speed I²C up to 3.4 MHz. It features a factory-programmed 128-bit unique serial number, user-lockable 64-byte ID page, built-in ECC for single-bit error correction, and hardware/software write protection - deployed in automotive instrument clusters for calibration storage.
For engineers reviewing the 24CS256T-E/SN datasheet, 24CS256T-E/SN pinout, 24CS256T-E/SN application, or 24CS256T-E/SN equivalent, key selection criteria include extended temperature support (–40°C to +125°C), AEC-Q100 qualification, dual write-protection modes (WP pin + configurable zone lock), ECC-enabled reliability (>1M write cycles, >200-year data retention), and compatibility with legacy 24AA256/24LC256 devices.
Technical Context
The 24CS256T-E/SN 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 comprises a 256-Kbit main array (0000h–7FFFh) and a separate 1-Kbit security register containing read-only serial number (0800h–080Fh) and user-programmable ID page (0840h–087Fh).
Device operation is governed by three dedicated registers: Configuration register (enables enhanced software write protection per 32-Kbit zone), Security register (supports permanent lock of ID page via software sequence), and Manufacturer ID register (24-bit I²C-compliant identifier). Write protection can be applied globally via WP pin or selectively via Configuration register bits - both modes coexist but require explicit mode selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8-bit), organized in 512 pages of 64 bytes each - enables efficient firmware parameter storage with page-aligned updates. |
| I²C Speed Support | Up to 3.4 MHz (High-Speed mode), plus 1 MHz / 400 kHz / 100 kHz - allows high-throughput configuration loading in real-time systems. |
| Write Cycle Time | ≤5 ms max (self-timed), supports byte or 64-byte page writes - reduces host MCU wait time and simplifies timing-critical boot sequences. |
| Operating Voltage | 1.7V to 5.5V - interoperable with 1.8V logic, 3.3V microcontrollers, and 5V legacy systems without level shifters. |
| Temperature Range | –40°C to +125°C (Extended grade, E-temp) - qualified for under-hood automotive and industrial edge controllers. |
| Data Retention | >200 years at 55°C - ensures long-term calibration stability in safety-critical applications like ADAS sensor modules. |
| Write Endurance | 1,000,000 erase/write cycles - supports frequent runtime logging in telematics gateways and battery management systems. |
Pinout & Package
24CS256T-E/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with gull-wing leads, RoHS-compliant, moisture sensitivity level (MSL) 1, and operating junction temperature range –40°C to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware Address Input | LSB of 3-bit device address; hardwired to VSS or VCC to select one of eight possible I²C addresses on shared bus. |
| A1 | Hardware Address Input | Middle bit of 3-bit device address; determines unique client address when multiple 24CS256T-E/SN devices share same I²C bus. |
| A2 | Hardware Address Input | MSB of 3-bit device address; enables up to eight identical EEPROMs on single I²C segment without address conflict. |
| VSS | Ground Reference | Primary return path for all internal circuits; must be low-impedance connection to system ground plane. |
| SDA | Serial Data Line | Open-drain bidirectional I²C data line requiring external pull-up resistor (330Ω for 3.4 MHz); transmits addresses, commands, and data. |
| SCL | Serial Clock Input | Input-only I²C clock line; synchronizes all data transfers; slope control minimizes ground bounce during fast transitions. |
| WP | Write-Protect Control | Active-high pin: tied to VCC disables all writes to main array and security register; tied to VSS enables full read/write access. |
| VCC | Power Supply | Single supply input (1.7V–5.5V); powers internal logic, EEPROM cell programming, and I/O buffers; requires local 0.1 µF decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed 128-Bit Serial Number | Globally unique identifier preloaded in read-only security register (0800h–080Fh), eliminating manufacturing-line serialization overhead. |
| User-Programmable & Lockable ID Page | 64-byte EEPROM section (0840h–087Fh) that can be permanently write-locked via software command - ideal for storing immutable device certificates. |
| Built-In Error Correction Code (ECC) | Corrects single-bit errors within any four-byte read window; Error Correction State (ECS) latch in Configuration register flags correction events for diagnostics. |
| Dual Write Protection Architecture | Hardware-level (WP pin) and software-configurable (per-zone via Configuration register) protection - enables flexible security policies across product lifecycle stages. |
| I²C Manufacturer Identification Function | Returns unique 24-bit ID on request, enabling automatic device identification and firmware version validation in multi-vendor BOMs. |
Applications
| Automotive Instrument Cluster | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing calibrated speedometer offsets, odometer values, and warning thresholds across vehicle lifetime. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with AEC-Q100 qualification and >200-year data retention; accessed during boot and runtime via I²C. Use Value: Eliminates recalibration after battery disconnect; ECC prevents corruption from EMI in noisy dashboard environments. |
Use Scenario: Holding I/O mapping tables, PID tuning parameters, and firmware update metadata in modular control cabinets. IC Role / Device Role / Timing Role: Field-updatable configuration memory interfaced to ARM Cortex-M7 PLC CPU via 1 MHz I²C. Use Value: Enables zero-downtime parameter changes; software zone protection prevents accidental overwrite of critical safety settings. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Securing drug delivery rate profiles, pump calibration coefficients, and audit logs in Class II medical devices. IC Role / Device Role / Timing Role: Tamper-resistant storage with lockable ID page for regulatory traceability; accessed during startup and dose verification. Use Value: Meets IEC 62304 requirements for data integrity; 128-bit serial number binds calibration records to specific hardware units. |
Use Scenario: Storing tariff schedules, metering constants, and cryptographic keys in ANSI C12.22-compliant utility meters. IC Role / Device Role / Timing Role: Secure nonvolatile memory with ECC and dual write protection - accessed during firmware upgrade and power-loss recovery. Use Value: Prevents unauthorized parameter modification; >1M endurance supports daily firmware patching over 10+ year field life. |
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 security register; max I²C speed 1 MHz; no AEC-Q100 qualification. | Lacks serial number, ID page, and ECC - suitable only for cost-sensitive consumer applications without safety or traceability needs. | Select only if automotive qualification, ECC, or secure ID storage are not required. |
| 24AA256-I/SN | Same pinout and basic functionality, but no High-Speed mode (max 400 kHz), no security register, no ECC, and only Industrial temp (–40°C to +85°C). | Cannot replace 24CS256T-E/SN in extended-temp or high-bandwidth applications; lacks serialization and error resilience. | Acceptable only for legacy designs where 24CS256T-E/SN features are unused and ambient temperature stays below 85°C. |
Compared with AT24C256C-SSHL-T and 24AA256-I/SN, the 24CS256T-E/SN delivers differentiated value through AEC-Q100 qualification, ECC-based reliability, factory-serialized identity, and 3.4 MHz throughput - making it the sole choice for automotive, medical, and industrial applications demanding traceability and data integrity.
Availability
24CS256T-E/SN is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 24CS256T-E/SN 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 microcontrollers, analog components, and memory solutions, serving automotive, industrial, and communications markets with high-reliability silicon and design tools.
The 24CS256T-E/SN belongs to Microchip's CS-series serial EEPROM family, engineered specifically for automotive-grade nonvolatile storage with integrated security, ECC, and extended-temperature operation - addressing traceability, functional safety, and long-term data integrity requirements.
FAQ
What is the maximum I²C clock frequency supported by the 24CS256T-E/SN?
The 24CS256T-E/SN supports I²C High-Speed mode up to 3.4 MHz when VCC is ≥2.5V and operating in Industrial temperature range. At lower voltages (1.7V–2.5V) or Extended temperature range, maximum clock frequency is 1 MHz. This enables faster configuration loading in time-critical applications such as automotive boot sequences.
Does the 24CS256T-E/SN include error correction capability?
Yes, the 24CS256T-E/SN integrates built-in Error Correction Code (ECC) logic that corrects single-bit errors within any four-byte read window. The Configuration register includes a read-only Error Correction State (ECS) latch that asserts when ECC correction occurs - providing diagnostic visibility into memory integrity events.
How is write protection implemented on the 24CS256T-E/SN?
The 24CS256T-E/SN offers dual write protection: hardware-based via the WP pin (global disable), and software-configurable via the Configuration register (per-zone protection of eight independent 32-Kbit blocks). Once locked, the Configuration register prevents further changes - enabling layered security for calibration data and firmware parameters.
Is the 24CS256T-E/SN qualified for automotive applications?
Yes, the 24CS256T-E/SN is AEC-Q100 qualified for Grade 1 (–40°C to +125°C) and rated for Extended temperature operation. It meets automotive reliability standards including >1 million write cycles, >200-year data retention, and >4 kV ESD protection - making it suitable for engine control, ADAS, and body electronics.
What unique identification features does the 24CS256T-E/SN provide?
The 24CS256T-E/SN includes a factory-programmed, globally unique 128-bit serial number in its security register (0800h–080Fh), plus a user-programmable and permanently lockable 64-byte ID page (0840h–087Fh). These features enable hardware binding, anti-counterfeiting, and regulatory traceability without external serialization infrastructure.
24CS256T-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- 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:
- 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-SOIC
24CS256T-E/SN FAQ
1.How can I place an order for 24CS256T-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24CS256T-E/SN 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/SN reliable?
The price and inventory of 24CS256T-E/SN 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/SN is usually 5 days.
3.What payment methods are accepted for 24CS256T-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24CS256T-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24CS256T-E/SN?
24CS256T-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24CS256T-E/SN 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/SN?
For technical support, including 24CS256T-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24CS256T-E/SN requirements.
6.How does Aetrix verify that 24CS256T-E/SN is sourced from the original manufacturer or authorized distributors?
All 24CS256T-E/SN 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/SN meets industry standards.
7.What is the process for return or replacement of 24CS256T-E/SN?
All 24CS256T-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24CS256T-E/SN, 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/SN part is unused and in its original packaging.
Return procedure for 24CS256T-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24CS256T-E/SN Tags
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