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Microchip Technology AT24C256-10TU-2.7
- Part No.:
- AT24C256-10TU-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24C256-10TU-2.7.pdf
- Description:
- IC EEPROM 256KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,949
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Product details
Overview
AT24C256-10TU-2.7 from Microchip Technology (formerly Atmel) is a 256 Kbit (32,768 × 8) two-wire serial EEPROM optimized for low-voltage industrial applications. It operates from 2.7V to 5.5V, supports up to 1 MHz I²C bus speed at 5V, features hardware write protection via the WP pin, and delivers 1 million write cycles with 40-year data retention. It is used in embedded systems for configuration storage, calibration data logging, and firmware parameter backup.
For engineers reviewing the AT24C256-10TU-2.7 datasheet, AT24C256-10TU-2.7 pinout, AT24C256-10TU-2.7 application, or AT24C256-10TU-2.7 equivalent, key selection criteria include its TSSOP-8 package, 2.7–5.5 V supply range, 64-byte page write capability, extended industrial temperature support (–40°C to +85°C), and RoHS-compliant green packaging.
Technical Context
The AT24C256-10TU-2.7 implements a standard two-wire (I²C-compatible) interface with open-drain SDA and active-high SCL, supporting multi-master bus sharing via device address bits A1/A0. Its internal architecture organizes memory as 512 pages of 64 bytes each, enabling efficient partial-page writes without rollover across page boundaries when limited to ≤64 bytes per transaction.
It integrates Schmitt-trigger inputs and noise-filtered logic for robust operation in electrically noisy environments, and uses an internal proprietary bias circuit to pull floating A1, A0, and WP pins to GND when capacitive coupling to VCC is below 3 pF - eliminating mandatory external pull-downs in many PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 256 Kbit (32,768 × 8 bits), organized as 512 pages × 64 bytes - enables compact firmware parameter storage with page-level erase/write granularity. |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level shifting. |
| I²C Clock Frequency | Up to 1 MHz at 5 V, 400 kHz at 2.7 V - supports high-speed configuration reads in real-time systems. |
| Write Cycle Time | Max 5 ms (for devices marked with process letter "B") - defines minimum interval between successive write commands. |
| Endurance & Retention | 1,000,000 write cycles and 40-year data retention at 25°C - ensures long-term reliability in field-deployed equipment. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation applications. |
| Package | 8-lead TSSOP (8A2), 4.4 mm body width - surface-mount footprint compatible with automated assembly and space-constrained PCBs. |
Pinout & Package
AT24C256-10TU-2.7 is housed in an 8-lead Plastic Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 variation AA compliant, with 0.65 mm lead pitch and 3.00 mm × 4.40 mm body dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired or left floating (internally pulled down); selects LSB of 3-bit device address for multi-device bus addressing (up to 4 devices). |
| A1 | Device Address Input | Hardwired or left floating (internally pulled down); selects MSB of 3-bit device address; enables cascading with other AT24Cxx devices. |
| NC | No Connect | Unbonded die pad; must remain unconnected on PCB to avoid parasitic coupling or ESD path disruption. |
| GND | Ground Reference | Primary return path for VCC and I/O; requires low-impedance connection to system ground plane for noise immunity. |
| VCC | Power Supply | 2.7–5.5 V DC input; bypassing with 100 nF ceramic capacitor near pin is required for stable I²C timing and write-cycle integrity. |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all writes; tied to GND enables full read/write access; floating defaults to GND via internal bias. |
| SCL | Serial Clock Input | Positive-edge clock for I²C transactions; requires external pull-up resistor (typically 2.2–10 kΩ) to VCC. |
| SDA | Serial Data I/O | Bidirectional open-drain bus line; shares pull-up with other I²C devices; supports wire-OR logic for multi-master arbitration. |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte Page Write Mode | Enables burst programming of up to 64 bytes per transaction, reducing I²C overhead and improving firmware update efficiency by >90% vs. byte-write mode. |
| Schmitt Trigger Inputs | Provides hysteresis on SCL/SDA/A0/A1/WP pins, rejecting <100 ns noise spikes and ensuring reliable operation in motor-drive or switching-power-supply adjacent layouts. |
| Hardware + Software Write Protection | WP pin blocks all writes when high; combined with software address-lock mechanisms, it prevents accidental or malicious overwrites during field servicing. |
| Self-timed Internal Write Cycle | Eliminates need for host MCU to poll status or manage timing - after STOP condition, device autonomously completes write within ≤5 ms and resumes I²C responsiveness. |
| Extended Temp & Green Packaging | TSSOP-8 package is lead-free, halogen-free, and qualified for –40°C to +85°C operation - meets IPC/JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Logging |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and user-defined alarm thresholds in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via I²C during boot and runtime reconfiguration; retains values across power cycles and brownouts. Use Value: Enables plug-and-play module replacement without manual setup; eliminates need for battery-backed SRAM and associated maintenance. |
Use Scenario: Recording sensor offset/gain coefficients, patient-specific therapy settings, and audit-trail timestamps in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter vault with hardware write protect; accessed only during calibration mode or firmware updates. Use Value: Ensures regulatory compliance (IEC 62304) by guaranteeing data integrity and traceability over 10+ years of clinical use. |
| Smart Energy Meter Firmware Parameters | Automotive Body Control Module Settings |
Use Scenario: Holding tariff schedules, meter ID, CT ratio configurations, and firmware patch flags in ANSI C12.22-compliant electricity meters operating in outdoor substations. IC Role / Device Role / Timing Role: Field-updatable configuration store interfaced to an 8-bit MCU over I²C; withstands wide ambient temperature swings and conducted EMI. Use Value: Supports remote utility reprogramming without physical meter access; 40-year retention exceeds meter lifetime requirements. |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock behavior preferences in automotive BCMs for premium vehicle trims. IC Role / Device Role / Timing Role: Low-power EEPROM accessed during ignition-on initialization; retains user preferences even after battery disconnect. Use Value: Delivers OEM-grade personalization without adding cost or complexity of FRAM or MRAM alternatives. |
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 | Successor generation with enhanced ESD rating (4 kV HBM), tighter AC timing specs, and updated process node; same pinout and voltage range. | Recommended for new designs requiring extended lifecycle support and improved robustness in high-noise automotive or industrial gateways. | Select AT24C256B-SSHL-T when designing new products - AT24C256-10TU-2.7 is not recommended for new designs per Microchip documentation. |
| STMicroelectronics M24256-BWMN6TP | Identical 256 Kbit capacity, 2.5–5.5 V range, TSSOP-8 package, and I²C interface; differs in write cycle time (max 10 ms) and endurance (400k cycles). | Suitable for cost-sensitive consumer electronics where 400k write cycles suffice and 10 ms write latency is acceptable. | Choose M24256-BWMN6TP only if supply chain diversification is critical and minor endurance/timing trade-offs are acceptable. |
Compared with AT24C256B-SSHL-T, the AT24C256-10TU-2.7 lacks updated ESD hardening and has longer write latency; versus M24256-BWMN6TP, it offers superior endurance and faster writes but narrower voltage headroom below 2.5 V.
Availability
AT24C256-10TU-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, and smart energy meters requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.
Supply support for AT24C256-10TU-2.7 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 is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with a focus on reliability, longevity, and embedded system integration.
The AT24C256-10TU-2.7 belongs to Microchip's legacy AT24Cxx serial EEPROM product line, designed specifically for cost-effective, low-power, I²C-based configuration and calibration data storage in industrial and commercial electronics.
FAQ
What is the maximum I²C clock frequency supported by AT24C256-10TU-2.7?
The AT24C256-10TU-2.7 supports up to 1 MHz I²C clock frequency when operated at 5.0 V, 400 kHz at 2.7 V, and 100 kHz at 1.8 V. These limits are defined in Table 4 and Table 5 of the datasheet and reflect guaranteed timing margins under specified load and voltage conditions. The AT24C256-10TU-2.7 does not support 1 MHz operation below 4.5 V.
Does AT24C256-10TU-2.7 require external pull-up resistors on SDA and SCL lines?
Yes, AT24C256-10TU-2.7 requires external pull-up resistors on both SDA and SCL lines because its I/O structure uses open-drain outputs. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time; Microchip recommends 4.7 kΩ for standard 100–400 kHz operation with ≤400 pF total bus capacitance. The AT24C256-10TU-2.7 itself does not integrate internal pull-ups.
Can AT24C256-10TU-2.7 be used in place of AT24C256B-SSHL-T?
No - while AT24C256-10TU-2.7 and AT24C256B-SSHL-T share identical pinout, memory organization, and basic I²C protocol, Microchip explicitly states that AT24C256-10TU-2.7 is not recommended for new designs and lacks the enhanced ESD performance, tighter AC timing, and extended qualification of the B-series. The AT24C256-10TU-2.7 may function in legacy systems but should not replace AT24C256B-SSHL-T in new designs.
What does the "U" suffix in AT24C256-10TU-2.7 indicate?
The "U" in AT24C256-10TU-2.7 denotes a green, RoHS-compliant, lead-free, and halogen-free package - specifically the TSSOP-8 variant (8A2). This marking aligns with Microchip's packaging nomenclature where "U" signifies environmental compliance and excludes Pb, Cd, Hg, Cr⁶⁺, PBB, and PBDE per EU Directive 2011/65/EU. The AT24C256-10TU-2.7 meets JEDEC J-STD-020 MSL3 handling requirements.
How does the WP pin function on AT24C256-10TU-2.7?
The WP (Write Protect) pin on AT24C256-10TU-2.7 is an active-high hardware lock: when driven to VCC, it inhibits all write operations including byte, page, and write-enable commands; when tied to GND, full read/write access is enabled. If left floating, the AT24C256-10TU-2.7 internally pulls WP down to GND via a proprietary bias circuit - but Microchip recommends explicit GND connection for deterministic behavior in noisy environments.
AT24C256-10TU-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 10ms
- Access Time:
- 550 ns
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT24C256-10TU-2.7 FAQ
1.How can I place an order for AT24C256-10TU-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256-10TU-2.7 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 AT24C256-10TU-2.7 reliable?
The price and inventory of AT24C256-10TU-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C256-10TU-2.7 is usually 5 days.
3.What payment methods are accepted for AT24C256-10TU-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256-10TU-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256-10TU-2.7?
AT24C256-10TU-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256-10TU-2.7 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 AT24C256-10TU-2.7?
For technical support, including AT24C256-10TU-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256-10TU-2.7 requirements.
6.How does Aetrix verify that AT24C256-10TU-2.7 is sourced from the original manufacturer or authorized distributors?
All AT24C256-10TU-2.7 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 AT24C256-10TU-2.7 meets industry standards.
7.What is the process for return or replacement of AT24C256-10TU-2.7?
All AT24C256-10TU-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256-10TU-2.7, 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 AT24C256-10TU-2.7 part is unused and in its original packaging.
Return procedure for AT24C256-10TU-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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