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Microchip Technology AT25256A-10CI-1.8
- Part No.:
- AT25256A-10CI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TDFN
- Datasheet:
-
AT25256A-10CI-1.8.pdf
- Description:
- IC EEPROM 256KBIT SPI 20MHZ 8LAP
- Quantity:
- Payment:
- Shipping:
Inventory:2,420
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Product details
Overview
AT25256A-10CI-1.8 from Microchip Technology (formerly Atmel) is a 256 Kbit serial SPI EEPROM organized as 32,768 × 8 bits, operating from 1.8 V to 5.5 V, supporting 20 MHz clock rate at 5 V, featuring 64-byte page write, hardware/software write protection, and automotive-grade temperature range (−40°C to +85°C). It serves as nonvolatile storage for configuration data in microcontroller-based industrial control systems.
For engineers reviewing the AT25256A-10CI-1.8 datasheet, AT25256A-10CI-1.8 pinout, AT25256A-10CI-1.8 application, or AT25256A-10CI-1.8 equivalent, key selection criteria include low-voltage operation down to 1.8 V, JEDEC SOIC-8 packaging with leadless array compatibility, block write protection granularity (1/4, 1/2, or full array), and 100,000 write endurance cycles with >100-year data retention.
Technical Context
The AT25256A-10CI-1.8 implements a synchronous SPI slave interface compliant with Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), with dedicated SI/SO pins and chip-select-driven command sequencing. Its internal architecture includes an 8-bit instruction register, status register with BP0/BP1/WPEN bits, and automatic address incrementing during page writes.
It supports hardware write protection via the WP pin (when WPEN=1) and software-controlled block protection through WRSR instructions. The HOLD pin enables suspension of ongoing serial transfers without resetting the sequence, while self-timed write cycles complete within 5 ms maximum-no external erase step required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8), sufficient for firmware parameter tables or calibration data in resource-constrained embedded nodes |
| Supply Voltage Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V logic families and backward compatibility with 3.3 V/5 V systems |
| Max Clock Frequency | 20 MHz at VCC = 5 V - supports high-throughput configuration loading in real-time control loops |
| Write Endurance | 100,000 cycles - suitable for applications requiring frequent field-updatable settings (e.g., sensor offset calibration) |
| Data Retention | >100 years at 25°C - ensures long-term reliability in unattended infrastructure monitoring devices |
| Operating Temperature | −40°C to +85°C - qualified for industrial automation and automotive body electronics environments |
| Package | 8-lead Leadless Array (LAP), 6 × 5 × 1.04 mm - compact footprint for space-limited PCBs with no exposed leads |
Pinout & Package
AT25256A-10CI-1.8 uses an 8-lead Leadless Array Package (LAP), designated 8CN3 per ordering information, measuring 6 mm × 5 mm × 1.04 mm with 1.27 mm pitch and bottom-exposed terminals. Pin 1 is marked by a corner chamfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; initiates command decoding and disables SO output when high |
| SO | Serial Data Output | Tri-state open-drain output delivering read data MSB-first; high-impedance when CS high or during HOLD |
| WP | Write Protect | Hardware lock for status register writes when WPEN=1 and WP low; prevents accidental configuration corruption |
| GND | Ground Reference | Primary return path for VCC current and digital I/O reference; must be low-impedance for noise immunity |
| VCC | Power Supply | Single-supply input (1.8–5.5 V); powers internal logic, memory array, and I/O buffers |
| HOLD | Communication Suspend | Pauses active SPI transfer without resetting state machine; requires SCK low during assertion/deassertion |
| SCK | Serial Clock Input | Asynchronous master-generated clock; defines timing for SI sampling and SO output edges |
| SI | Serial Data Input | Command/address/data input synchronized to SCK rising/falling edge per SPI mode; ignored during HOLD |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Interoperability with diverse microcontrollers including ARM Cortex-M, PIC, and legacy 8051 derivatives without protocol translation |
| 64-byte Page Write | Reduces write latency versus byte-wise programming; enables efficient bulk updates of configuration blocks |
| Block Write Protection | Configurable top-¼, top-½, or full-array lock via status register - isolates critical boot code from runtime overwrites |
| WP Pin + Software Lock | Dual-layer protection: hardware disable of status register writes plus software-controlled memory segment locking |
| Self-timed Write Cycle | No external timing circuitry needed; internal oscillator manages 5 ms max write duration - simplifies host firmware design |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing calibrated sensor thresholds and I/O mapping tables in programmable logic controllers deployed in factory-floor environments. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed via SPI during power-up and runtime reconfiguration events. Use Value: Ensures deterministic startup behavior and field-upgradable parameters without requiring external backup batteries or FRAM. | Use Scenario: Holding door-lock actuator profiles, lighting dimming curves, and seat-position presets in 12 V automotive BCMs. IC Role / Device Role / Timing Role: SPI-connected EEPROM providing persistent storage for user-customizable vehicle settings across ignition cycles. Use Value: Meets AEC-Q100 stress requirements and supports 1.8 V MCU interfaces while maintaining >100-year data integrity. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Storing flow-rate calibration coefficients and safety limit values in Class II medical infusion pumps subject to regulatory audit. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory element accessed only during maintenance mode via authenticated SPI commands. Use Value: Hardware WP pin and status-register lock prevent unauthorized modification of life-critical dosage parameters. | Use Scenario: Retaining tariff schedules, metering constants, and communication keys in ANSI C12.19-compliant smart electricity meters. IC Role / Device Role / Timing Role: Low-power serial EEPROM interfaced to 32-bit RISC MCU during meter initialization and firmware updates. Use Value: 100,000 write cycles support daily time-of-use schedule changes over 27+ years of service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DRMN3TP/K | 256 Kbit SPI EEPROM, 1.8–5.5 V, 20 MHz, SO8 package (not leadless); WP/HOLD pins present but no LAP option | Lacks 8CN3 leadless package; requires PCB redesign if footprint compatibility is mandatory | Select when SOIC-8 layout reuse is prioritized over board area minimization |
| BR25H256FJ-WE2 | 256 Kbit SPI EEPROM, 1.7–5.5 V, 10 MHz max, 8-pin TSSOP; built-in error correction and enhanced ESD protection | Lower max clock rate limits high-speed parameter loading; TSSOP footprint differs from LAP | Prefer for high-noise automotive cabins where ECC and ±8 kV HBM ESD are critical |
Compared with M95256-DRMN3TP/K and BR25H256FJ-WE2, AT25256A-10CI-1.8 uniquely combines leadless 6×5 mm packaging, 20 MHz operation at 5 V, and automotive-grade qualification-making it optimal for space-constrained, high-throughput industrial controllers needing minimal PCB real estate.
Availability
AT25256A-10CI-1.8 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended product lifecycles.
Supply support for AT25256A-10CI-1.8 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 memory solutions, with broad industrial and automotive qualifications.
The AT25256A-10CI-1.8 belongs to Microchip's legacy Atmel SPI EEPROM family, designed specifically for reliable, low-voltage nonvolatile storage in harsh-environment embedded systems where data integrity and long-term retention are critical.
FAQ
What voltage range does the AT25256A-10CI-1.8 support, and how does it affect system design?
The AT25256A-10CI-1.8 operates from 1.8 V to 5.5 V, enabling direct integration with 1.8 V logic families without level shifters and maintaining compatibility with legacy 3.3 V and 5 V systems. This wide range simplifies power architecture in mixed-voltage designs and eliminates need for dedicated EEPROM regulators-reducing BOM count and board area. Its 1.8 V minimum allows use with ultra-low-power MCUs in battery-operated sensors.
How does the HOLD pin function on the AT25256A-10CI-1.8 during SPI communication?
The HOLD pin on the AT25256A-10CI-1.8 suspends ongoing SPI transfers without resetting the internal state machine. When asserted low while SCK is low, it places SO in high-impedance and ignores SI inputs until deasserted-also while SCK is low. This enables multi-master arbitration or host CPU preemption without corrupting partial commands, preserving data integrity during priority interrupts in real-time systems using AT25256A-10CI-1.8.
What block write protection levels are available on the AT25256A-10CI-1.8, and how are they configured?
The AT25256A-10CI-1.8 offers four block write protection levels (none, top 1/4, top 1/2, or full array) controlled by BP0/BP1 bits in the status register. These are set via the WRSR instruction after issuing WREN. For AT25256A-10CI-1.8, protected address ranges are 0000–7FFF (full), 4000–7FFF (top 1/2), and 6000–7FFF (top 1/4). This allows isolation of bootloader or security keys from application-level writes-enhancing firmware robustness.
Is the AT25256A-10CI-1.8 pin-compatible with other packages in the AT25256A family?
No-AT25256A-10CI-1.8 uses the 8-lead Leadless Array Package (8CN3), which has a unique 6×5 mm footprint and bottom-terminal layout distinct from SOIC-8 (8S1), TSSOP-8 (8A2), or dBGA2 (8U2-1) variants. While functionally identical, mechanical incompatibility means PCB redesign is required when substituting AT25256A-10CI-1.8 for other package versions-even within the same AT25256A family.
What is the write endurance and data retention specification for the AT25256A-10CI-1.8?
The AT25256A-10CI-1.8 guarantees 100,000 write/erase cycles per memory location and >100 years of data retention at 25°C. These specifications are validated under JEDEC conditions and apply across its full −40°C to +85°C operating range. This makes AT25256A-10CI-1.8 suitable for applications requiring decades-long field deployment without maintenance, such as utility metering infrastructure or industrial control firmware storage.
AT25256A-10CI-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TDFN
- 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:
- 20 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LAP (5x6)
AT25256A-10CI-1.8 FAQ
1.How can I place an order for AT25256A-10CI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256A-10CI-1.8 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 AT25256A-10CI-1.8 reliable?
The price and inventory of AT25256A-10CI-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25256A-10CI-1.8 is usually 5 days.
3.What payment methods are accepted for AT25256A-10CI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256A-10CI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256A-10CI-1.8?
AT25256A-10CI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256A-10CI-1.8 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 AT25256A-10CI-1.8?
For technical support, including AT25256A-10CI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256A-10CI-1.8 requirements.
6.How does Aetrix verify that AT25256A-10CI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25256A-10CI-1.8 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 AT25256A-10CI-1.8 meets industry standards.
7.What is the process for return or replacement of AT25256A-10CI-1.8?
All AT25256A-10CI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25256A-10CI-1.8, 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 AT25256A-10CI-1.8 part is unused and in its original packaging.
Return procedure for AT25256A-10CI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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