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Microchip Technology AT25256-10PI-2.7
- Part No.:
- AT25256-10PI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25256-10PI-2.7.pdf
- Description:
- IC EEPROM 256KBIT SPI 3MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,803
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Product details
Overview
AT25256-10PI-2.7 from Microchip Technology (formerly Atmel) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8 bits, operating from 2.7V to 5.5V, supporting SPI Modes 0 and 3, with 3 MHz max clock rate and 64-byte page write capability. It delivers high-reliability nonvolatile storage for industrial control panels requiring low-voltage operation and robust data retention.
For engineers reviewing the AT25256-10PI-2.7 datasheet, AT25256-10PI-2.7 pinout, AT25256-10PI-2.7 application, or AT25256-10PI-2.7 equivalent, key selection considerations include its 8-lead SOIC package, hardware/software write protection via WP/HOLD pins, 100,000 write cycles endurance, >200-year data retention, and automotive-grade temperature range (–40°C to +85°C).
Technical Context
The AT25256-10PI-2.7 functions as an SPI slave device with separate SI (input) and SO (output) lines, using MSB-first transmission and requiring WREN before WRITE. Its status register controls block write protection (BP1/BP0) and WPEN-enabled hardware lockout.
It implements self-timed internal write cycles (5 ms typical), supports HOLD pin suspension without sequence reset, and enforces write disable on power-up-requiring explicit WREN instruction prior to any memory or status register programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8), enabling firmware parameter storage in space-constrained embedded controllers |
| Supply Voltage Range | 2.7V to 5.5V - compatible with both 3.3V and 5V logic systems without level-shifting |
| Max Clock Frequency | 3 MHz - supports fast configuration loading in real-time industrial I/O modules |
| Write Endurance | 100,000 cycles - sufficient for daily calibration logging over 27 years of field operation |
| Data Retention | >200 years at 25°C - ensures long-term integrity of device identity and calibration constants |
| Page Write Size | 64 bytes - minimizes transaction overhead when updating multi-byte configuration structures |
| Operating Temperature | –40°C to +85°C - qualified for use in industrial PLCs and outdoor metering equipment |
Pinout & Package
AT25256-10PI-2.7 uses an 8-lead EIAJ SOIC (8S2) package: 0.209" body width, 1.27 mm pitch, gull-wing leads. Pin 1 is marked by notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low during full SPI transaction including op-code, address, and data |
| SCK | Serial Clock Input | Master-generated clock; timing-critical for setup/hold compliance per Table 4 AC specs |
| SI | Serial Data Input | Receives op-codes (e.g., WREN, WRITE), addresses, and data; MSB first |
| SO | Serial Data Output | Drives read data and status register bits; high-impedance when CS high or HOLD active |
| GND | Ground Reference | Return path for VCC and all I/O; requires low-inductance connection to minimize noise coupling |
| VCC | Power Supply | 2.7V–5.5V input; decoupling capacitor (0.1 µF ceramic) required within 10 mm of pin |
| WP | Write Protect | Hardware lock: disables status register writes when WPEN=1 and WP=low |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer (e.g., during interrupt servicing) without resetting address counter |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Interoperates with diverse microcontrollers (e.g., STM32, PIC, MSP430) without protocol translation |
| Block Write Protection | Configurable 1/4, 1/2, or full array lock via nonvolatile BP0/BP1 bits - prevents accidental firmware corruption |
| Hardware + Software Write Protection | WP pin + WRSR instruction provide dual-layer security for critical calibration or security keys |
| Self-timed Write Cycle | No external erase step needed; internal timing eliminates need for host-side delay loops or polling overhead |
| Low Standby Current | 0.2 µA typical at 2.7V - extends battery life in portable diagnostic tools and wireless sensors |
Applications
| Industrial PLC Configuration Storage | Automotive ECU Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via SPI during boot and runtime reconfiguration. Use Value: Enables field-upgradable logic behavior without firmware reflashing; 100K endurance supports daily parameter updates over 27+ years. |
Use Scenario: Holding engine calibration maps, sensor offset corrections, and fault history logs in automotive body control modules. IC Role / Device Role / Timing Role: SPI-connected EEPROM providing deterministic read/write latency for safety-critical calibration data. Use Value: >200-year data retention ensures calibration validity across vehicle lifetime; –40°C to +85°C rating matches under-hood thermal requirements. |
| Medical Device Settings Backup | Smart Meter Firmware Parameters |
Use Scenario: Preserving user-adjustable therapy settings (e.g., infusion rate, alarm limits) in portable infusion pumps and dialysis monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory with hardware write protection preventing unauthorized setting changes. Use Value: WP pin + WPEN bit allow permanent lock of clinical defaults while permitting authorized updates via secure bootloader interface. |
Use Scenario: Storing tariff schedules, communication credentials, and metrology calibration coefficients in ANSI C12.19-compliant smart electricity meters. IC Role / Device Role / Timing Role: High-reliability serial memory interfaced to metrology SoC via isolated SPI bus. Use Value: 64-byte page writes reduce SPI transaction count during firmware update; 2.7V–5.5V range accommodates wide-input DC-DC output variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-WDW6TP | STMicroelectronics 256 Kbit SPI EEPROM; identical 8-lead SOIC package, 2.5–5.5V supply, but rated for 5 MHz clock (vs. 3 MHz) | Higher-speed read/write enables faster firmware patching in test equipment; same endurance (100K cycles) and retention (>200 years) | Select when system clock exceeds 3 MHz or requires extended voltage margin down to 2.5V |
| BR25L256FJ-WE2 | Rohm 256 Kbit SPI EEPROM; 8-lead SOP package, 1.7–5.5V supply, 20 MHz max clock, but only 10K write cycles endurance | Superior speed supports high-throughput data loggers; lower endurance restricts use to infrequent configuration updates | Select for high-speed logging where write frequency is low (<100x/day) and 1.7V operation is required |
Compared with M95256-WDW6TP and BR25L256FJ-WE2, the AT25256-10PI-2.7 offers balanced performance: guaranteed 3 MHz operation across full voltage range, industry-standard 100K-cycle endurance, and proven automotive qualification - making it optimal for cost-sensitive industrial control designs requiring long-term reliability without over-spec'ing speed or voltage range.
Availability
AT25256-10PI-2.7 is available at Aetrix Electronics and suitable for industrial control systems, automotive ECUs, medical instrumentation, and smart metering applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for AT25256-10PI-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 acquired Atmel in 2016 and maintains full support for legacy Atmel memory products, offering broad distribution, technical documentation, and long-term product availability commitments.
The AT25256-10PI-2.7 belongs to Microchip's legacy serial EEPROM family designed for reliable, low-power nonvolatile storage in industrial, automotive, and medical systems where SPI interface simplicity and data integrity are critical.
FAQ
What is the maximum clock frequency supported by the AT25256-10PI-2.7?
The AT25256-10PI-2.7 supports a maximum SCK clock frequency of 3 MHz across its full 2.7V–5.5V supply range and –40°C to +85°C temperature range, as specified in Table 4 AC Characteristics. This value is validated for reliable read/write operations without timing violations under worst-case conditions.
Does the AT25256-10PI-2.7 require an external erase command before writing?
No, the AT25256-10PI-2.7 does not require a separate erase command. All write operations are self-timed and internally managed; the device automatically erases the target byte or page before programming. Only a WREN instruction followed by WRITE is needed to initiate data storage.
How does the HOLD pin function during SPI communication with the AT25256-10PI-2.7?
The HOLD pin on the AT25256-10PI-2.7 suspends ongoing SPI transactions without resetting the internal address counter or serial sequence. When asserted low (with SCK low), it places SO in high-impedance state and ignores SI inputs, allowing the master to service interrupts and resume exactly where it left off.
What package type is used for the AT25256-10PI-2.7?
The AT25256-10PI-2.7 uses an 8-lead EIAJ SOIC package (designated 8S2), measuring 0.209" body width with 1.27 mm lead pitch. This package is distinct from JEDEC SOIC (8S1) and is confirmed in the Ordering Information table on page 14 of the datasheet.
Can the AT25256-10PI-2.7 be used in automotive applications?
Yes, the AT25256-10PI-2.7 is explicitly qualified for automotive-grade operation with an industrial temperature range of –40°C to +85°C and is listed as "Automotive Grade" in the Features section. It meets reliability requirements for body electronics, dashboard modules, and non-safety-critical ECUs.
AT25256-10PI-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:
- SPI
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25256-10PI-2.7 FAQ
1.How can I place an order for AT25256-10PI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256-10PI-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 AT25256-10PI-2.7 reliable?
The price and inventory of AT25256-10PI-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 AT25256-10PI-2.7 is usually 5 days.
3.What payment methods are accepted for AT25256-10PI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256-10PI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256-10PI-2.7?
AT25256-10PI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256-10PI-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 AT25256-10PI-2.7?
For technical support, including AT25256-10PI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256-10PI-2.7 requirements.
6.How does Aetrix verify that AT25256-10PI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25256-10PI-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 AT25256-10PI-2.7 meets industry standards.
7.What is the process for return or replacement of AT25256-10PI-2.7?
All AT25256-10PI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25256-10PI-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 AT25256-10PI-2.7 part is unused and in its original packaging.
Return procedure for AT25256-10PI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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