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Microchip Technology AT24C256-10PU-2.7
- Part No.:
- AT24C256-10PU-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT24C256-10PU-2.7.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,054
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Product details
Overview
AT24C256-10PU-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 clock at 5V, features hardware write protection via 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 AT24C256-10PU-2.7 datasheet, AT24C256-10PU-2.7 pinout, AT24C256-10PU-2.7 application, or AT24C256-10PU-2.7 equivalent, key selection considerations include its 8-lead PDIP package, 2.7–5.5 V supply range, 64-byte page write capability, and compatibility with standard I²C bus timing at industrial temperature (–40°C to +85°C).
Technical Context
The AT24C256-10PU-2.7 implements a standard two-wire (I²C-compatible) serial interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. Its address decoding uses A0 and A1 pins to support up to four devices on a shared bus, and it employs internal address auto-increment during sequential reads and writes.
Write operations are self-timed with a maximum 5 ms cycle time (for B-process variants), and the device enters standby mode after STOP condition receipt or power-up. Hardware write protection is enforced when WP is tied to VCC, while floating or grounded WP enables normal write access per Atmel's internal biasing design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 256 Kbit (32,768 words × 8 bits), organized as 512 pages of 64 bytes each - enables efficient block-level updates without full-memory erase. |
| Supply Voltage Range | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level shifting. |
| I²C Clock Frequency | Up to 1 MHz at 5 V, 400 kHz at 2.7 V - ensures high-speed configuration loading in time-critical boot sequences. |
| Write Endurance | 1,000,000 cycles (B-process variant) - suitable for frequent runtime parameter logging in industrial controllers. |
| Data Retention | 40 years at +25°C - guarantees long-term integrity of calibration coefficients and security keys across product lifecycle. |
| Operating Temperature | –40°C to +85°C - qualified for deployment in industrial automation, metering, and automotive body electronics. |
| Page Write Size | 64-byte page write with partial-page support - reduces write latency versus byte-write and avoids unnecessary overwrites. |
Pinout & Package
AT24C256-10PU-2.7 is supplied in an 8-lead JEDEC-standard Plastic Dual Inline Package (PDIP), 0.300" wide (package code 8P3), RoHS-compliant and halogen-free ("U" suffix). Pin 1 is bottom-left corner when notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired low/high or left unconnected to configure one of four possible I²C slave addresses (0x50–0x53) on shared bus. |
| A1 | Device Address Input | Second address bit; used with A0 to enable multi-device topology without external logic or address jumpers. |
| NC | No Connect | Internally unused pin; must remain unconnected - no pull-up/down or routing required. |
| GND | Ground Reference | System return path for VCC and signal references; requires low-impedance connection to PCB ground plane. |
| VCC | Power Supply | Primary supply input (2.7–5.5 V); decoupling capacitor (0.1 µF ceramic) recommended within 10 mm of pin. |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all writes; grounded or floating enables write access per internal pull-down. |
| SCL | Serial Clock Input | Positive-edge sampled clock for I²C communication; Schmitt trigger input rejects noise on shared bus lines. |
| SDA | Serial Data I/O | Open-drain bidirectional data line; requires external pull-up resistor (typically 2.2–10 kΩ to VCC) for bus operation. |
Key Features
| Feature | Design Value |
|---|---|
| Two-wire Serial Interface | Fully compatible with standard I²C protocol (including START/STOP/ACK), enabling seamless integration with ARM Cortex-M, PIC, and legacy 8-bit MCUs. |
| 64-byte Page Write Mode | Reduces average write time by >90% vs. byte-write for multi-byte updates - critical for fast factory programming and field firmware patching. |
| Schmitt Trigger Inputs | Enhanced noise immunity on SCL and SDA pins allows reliable operation in electrically noisy industrial environments (e.g., motor drives, PLCs). |
| Hardware + Software Write Protection | WP pin provides immediate physical lockout; software lock bits (if implemented in host firmware) add layered security for sensitive configuration data. |
| Extended Temperature Support | Validated operation from –40°C to +85°C ensures stable read/write behavior in uncontrolled enclosures and outdoor metering housings. |
Applications
| Industrial Sensor Calibration | POS Terminal Configuration Storage |
|---|---|
Use Scenario: Storing sensor offset/gain coefficients and linearization tables during factory calibration and field recalibration cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter register bank accessed via I²C during system initialization and maintenance mode. Use Value: Enables traceable, field-updatable calibration without requiring MCU reprogramming or external flash management firmware. | Use Scenario: Holding tax rate tables, language packs, and merchant-specific UI settings in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Persistent configuration store updated infrequently but read on every power-on and transaction start. Use Value: Guarantees consistent UI behavior and regulatory compliance across power cycles and firmware updates without NAND wear-leveling overhead. |
| Smart Energy Meter Firmware Parameters | Medical Device Usage Logs |
Use Scenario: Recording tariff schedules, demand-response thresholds, and meter ID binding in ANSI C12.19-compliant smart meters. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter vault accessed only by authenticated firmware during commissioning and utility updates. Use Value: Meets ANSI/IEEE data integrity requirements with 1M-cycle endurance and 40-year retention - eliminating need for battery-backed SRAM. | Use Scenario: Logging operator actions, error events, and calibration timestamps in Class II medical diagnostic equipment. IC Role / Device Role / Timing Role: Audit-trail memory written synchronously after critical state transitions, with WP pin physically secured during normal operation. Use Value: Provides FDA 21 CFR Part 11-compliant electronic records using deterministic write timing and hardware-enforced write lock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256B-SSHM-T | Same capacity and voltage range, but in 8-lead SOIC (8S1) package; B-process variant with guaranteed 1M write cycles and extended temp rating (–40°C to +125°C). | Preferred for new designs requiring higher reliability or surface-mount assembly; not pin-compatible with PDIP due to different footprint. | Select when upgrading from AT24C256-10PU-2.7 for improved manufacturability or extended temperature margin. |
| M24256-BWMN6TP | STMicroelectronics 256 Kbit I²C EEPROM in 8-lead SOIC; supports 1.7–5.5 V, 400 kHz max speed, 3M write cycles, and 200-year retention. | Higher endurance and longer retention, but lacks 1 MHz mode and has different AC timing margins - may require I²C bus timing validation. | Choose for ultra-long-life applications where write frequency exceeds 10⁵ cycles/year and 5V-only timing is not required. |
Compared with AT24C256-10PU-2.7, the AT24C256B-SSHM-T offers superior thermal robustness and modern packaging, while the M24256-BWMN6TP trades raw speed for extreme endurance and retention - both require layout changes and firmware timing review.
Availability
AT24C256-10PU-2.7 is available at Aetrix Electronics and suitable for industrial control, energy metering, and medical device applications requiring stable component supply, long-lifecycle support, and RoHS-compliant through-hole assembly.
Supply support for AT24C256-10PU-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 embedded control and connectivity.
The AT24C256-10PU-2.7 belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed for cost-sensitive, space-constrained systems needing reliable, low-power, I²C-compatible nonvolatile storage in industrial and commercial environments.
FAQ
What is the maximum I²C clock frequency supported by AT24C256-10PU-2.7?
The AT24C256-10PU-2.7 supports up to 1 MHz I²C clock frequency when operating at 5.0 V, 400 kHz at 2.7 V, and 100 kHz at 1.8 V. For this specific part (–2.7 suffix), the 1 MHz mode is valid only at VCC ≥ 4.5 V per datasheet Table 4 and ordering notes. Designers must verify bus timing margins under actual VCC and load conditions.
Does AT24C256-10PU-2.7 support page write operations, and what is the page size?
Yes, AT24C256-10PU-2.7 supports 64-byte page write operations, allowing up to 64 sequential bytes to be written in a single I²C transaction. This reduces total write time versus individual byte writes and is essential for efficient firmware parameter updates. Partial page writes are permitted, and address roll-over occurs within the same page boundary.
What does the "PU" in AT24C256-10PU-2.7 indicate?
The "PU" in AT24C256-10PU-2.7 denotes a lead-free, halogen-free, RoHS-compliant 8-lead PDIP package (JEDEC 8P3) with industrial temperature range (–40°C to +85°C). The "U" confirms green packaging, and "P" specifies plastic DIP - distinguishing it from SOIC (S), TSSOP (T), or dBGA2 (U2) variants in the same family.
Is AT24C256-10PU-2.7 suitable for new designs, and what is the recommended replacement?
No - AT24C256-10PU-2.7 is marked "not recommended for new design" per Microchip's datasheet revision history. The recommended upgrade is AT24C256B-SSHM-T (SOIC-8, B-process), which guarantees 1 million write cycles, extended temperature operation (–40°C to +125°C), and improved AC characteristics. Migration requires PCB layout change due to package difference.
How does the WP pin function on AT24C256-10PU-2.7, and what happens if it is left floating?
On AT24C256-10PU-2.7, the WP pin is active-high: tying it to VCC inhibits all write operations, while grounding enables writes. If left floating, the pin is internally pulled down to GND *only if* capacitive coupling to the PCB VCC plane is <3 pF; otherwise, unpredictable behavior may occur. Microchip recommends hardwiring WP to GND or VCC for deterministic operation.
AT24C256-10PU-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT24C256-10PU-2.7 FAQ
1.How can I place an order for AT24C256-10PU-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256-10PU-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 AT24C256-10PU-2.7 reliable?
The price and inventory of AT24C256-10PU-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 AT24C256-10PU-2.7 is usually 5 days.
3.What payment methods are accepted for AT24C256-10PU-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256-10PU-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256-10PU-2.7?
AT24C256-10PU-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256-10PU-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 AT24C256-10PU-2.7?
For technical support, including AT24C256-10PU-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256-10PU-2.7 requirements.
6.How does Aetrix verify that AT24C256-10PU-2.7 is sourced from the original manufacturer or authorized distributors?
All AT24C256-10PU-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 AT24C256-10PU-2.7 meets industry standards.
7.What is the process for return or replacement of AT24C256-10PU-2.7?
All AT24C256-10PU-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256-10PU-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 AT24C256-10PU-2.7 part is unused and in its original packaging.
Return procedure for AT24C256-10PU-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT24C256-10PU-2.7 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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