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Microchip Technology AT25256A-10PU-1.8
- Part No.:
- AT25256A-10PU-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25256A-10PU-1.8.pdf
- Description:
- IC EEPROM 256KBIT SPI 20MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,838
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Product details
Overview
AT25256A-10PU-1.8 from Microchip Technology (formerly Atmel) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8 bits, operating from 1.8 V to 5.5 V, supporting 20 MHz clock rate at 5 V, with 64-byte page write and 1 million write cycles endurance. It serves as nonvolatile data storage in microcontroller-based systems requiring low-voltage operation and industrial temperature range (−40°C to +85°C).
For engineers reviewing the AT25256A-10PU-1.8 datasheet, AT25256A-10PU-1.8 pinout, AT25256A-10PU-1.8 application, or AT25256A-10PU-1.8 equivalent, key selection considerations include its 1.8 V–5.5 V supply range, hardware/software write protection via WP/HOLD pins, SPI Mode 0/3 compatibility, and 8-lead PDIP package with verified pin mapping.
Technical Context
The AT25256A-10PU-1.8 implements a synchronous serial peripheral interface (SPI) as a slave device with separate SI (input) and SO (output) lines, MSB-first data transfer, and op-code–driven command set including WREN, WRITE, RDSR, and WRSR. It requires CS low to enable communication and supports hold/suspend functionality via the HOLD pin without resetting the sequence.
Its internal architecture includes a nonvolatile status register with BP0/BP1 for block write protection (1/4, 1/2, or full array), WPEN bit enabling hardware write protection, and automatic address increment during page writes. All write cycles are self-timed (≤5 ms), with no erase step required prior to programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits) - provides sufficient nonvolatile storage for firmware parameters, calibration data, or configuration registers in space-constrained embedded designs. |
| Supply Voltage Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without level shifting. |
| Max Clock Frequency | 20 MHz at VCC = 5 V - supports high-speed read/write in time-critical applications such as real-time logging or boot configuration loading. |
| Write Endurance | 1 million write cycles - ensures long-term reliability in applications with frequent parameter updates, e.g., energy metering or sensor calibration. |
| Data Retention | >100 years - guarantees persistent storage integrity across product lifetime without refresh or backup power. |
| Page Write Size | 64 bytes - optimizes write efficiency by reducing transaction overhead versus byte-write mode, lowering total programming time per data block. |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including factory automation, HVAC controls, and industrial IoT edge nodes. |
Pinout & Package
AT25256A-10PU-1.8 is housed in an 8-lead PDIP (Plastic Dual In-line Package), 0.300" wide body, RoHS-compliant and lead-free/halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be low to accept commands and data on SI/SCK; drives SO to high-impedance when high. |
| SCK | Serial Clock | Input clock synchronizing all data transfers; supports SPI Modes 0 and 3; timing critical for setup/hold compliance. |
| SI | Serial Data Input | Command, address, and data input line; MSB-first; ignored during HOLD or when CS is high. |
| SO | Serial Data Output | Read data output; tri-state when CS high or during HOLD; valid after tV delay from SCK edge. |
| GND | Ground Reference | Primary return path for VCC and I/O signals; must be low-impedance to minimize noise coupling into SPI bus. |
| VCC | Power Supply | Single supply input (1.8–5.5 V); powers internal logic and memory array; bypass capacitor recommended near pin. |
| WP | Write Protect | Hardware lock for status register and protected memory blocks when WPEN = 1 and WP = low; prevents accidental writes during power transitions. |
| HOLD | Communication Suspend | Pauses ongoing SPI transaction (e.g., mid-read/write) without resetting state; requires SCK low to assert/deassert. |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Enables interoperability with diverse microcontrollers (e.g., ARM Cortex-M, PIC, STM32) without protocol translation or software adaptation. |
| Block Write Protection | Configurable via status register to protect top 1/4, 1/2, or entire memory array-critical for safeguarding bootloader code or security keys. |
| Self-timed Write Cycle | Eliminates need for external timing control or polling delay; ≤5 ms max duration allows deterministic system-level scheduling of write operations. |
| Low Standby Current | 0.2 µA typical at 1.8 V - extends battery life in portable or energy-harvesting devices where EEPROM remains powered but idle for extended periods. |
| Industrial Temp Range | −40°C to +85°C operation - validated for use in uncontrolled ambient environments such as motor drives, industrial sensors, and outdoor gateways. |
Applications
| Smart Energy Metering | Industrial PLC Configuration |
|---|---|
Use Scenario: Storing tariff schedules, meter calibration constants, and tamper-event logs in utility-grade electricity meters. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed retention over 10+ years and immunity to brownout-induced corruption. Use Value: Enables regulatory compliance with IEC 62056 and ANSI C12.20 via deterministic write timing (≤5 ms) and 1M-cycle endurance for daily log updates. | Use Scenario: Holding user-defined I/O mapping, PID tuning parameters, and firmware update staging data in programmable logic controllers. IC Role / Device Role / Timing Role: Configurable, field-updatable memory accessible via SPI from main MCU without interrupting real-time control loops. Use Value: Supports zero-downtime reconfiguration using hardware write protection (WP pin) to prevent runtime corruption during hot-swap module insertion. |
| Medical Diagnostic Device Calibration | Automotive Body Control Module (BCM) |
Use Scenario: Archiving sensor offset/gain coefficients and diagnostic fault history in portable ultrasound or ECG units. IC Role / Device Role / Timing Role: Low-power, high-reliability storage operating from 1.8 V supply rails common in battery-backed medical SoCs. Use Value: >100-year data retention ensures calibration validity across device lifetime, while 64-byte page writes accelerate multi-parameter updates during service calibration. | Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive BCMs with CAN/LIN interfaces. IC Role / Device Role / Timing Role: Secondary nonvolatile memory co-located with MCU for user preference persistence independent of main flash wear leveling. Use Value: Hardware WP/HOLD support enables safe concurrent access during CAN message handling-preventing bus contention or data loss during power cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DRMN6TP/K | Same 256 Kbit density and SPI interface, but rated for −40°C to +125°C and features enhanced ESD protection (4 kV HBM). | Targeted at automotive under-hood modules requiring extended temperature grade; not qualified for industrial-only use cases. | Select when AEC-Q100 qualification or higher thermal margin is mandatory; otherwise, AT25256A-10PU-1.8 offers lower cost and identical functional behavior in industrial settings. |
| BR25H256FJ-WE2 | 1.7 V–5.5 V supply, 20 MHz max, but uses quad SPI (QSPI) capable pinout and supports dual I/O read modes. | Optimized for high-throughput read-heavy applications (e.g., firmware patch storage); lacks HOLD pin and has different status register layout. | Choose only if QSPI bandwidth advantage is needed and HOLD functionality is unused; AT25256A-10PU-1.8 remains preferred for standard SPI simplicity and full feature parity. |
Compared with M95256-DRMN6TP/K and BR25H256FJ-WE2, the AT25256A-10PU-1.8 delivers optimal balance of industrial temperature compliance, full SPI feature set (including HOLD/WP), and proven interoperability with legacy MCU peripherals-making it the most direct fit for cost-sensitive, non-automotive embedded systems requiring robust, low-voltage EEPROM.
Availability
AT25256A-10PU-1.8 is available at Aetrix Electronics and suitable for smart energy metering, industrial PLC configuration, and medical diagnostic device calibration requiring stable component supply and long-term obsolescence management.
Supply support for AT25256A-10PU-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 components, and nonvolatile memory solutions, with broad industrial and automotive qualification coverage.
The AT25256A-10PU-1.8 belongs to Microchip's legacy Atmel SPI EEPROM family, designed specifically for reliable, low-power, pin-efficient nonvolatile storage in resource-constrained embedded systems interfacing directly with 8-/16-/32-bit MCUs.
FAQ
What is the maximum clock frequency supported by AT25256A-10PU-1.8?
The AT25256A-10PU-1.8 supports up to 20 MHz SCK frequency at VCC = 5.0 V, 10 MHz at VCC = 2.7–5.5 V, and 5 MHz at VCC = 1.8–3.6 V. These values are specified in Table 1-3 of the datasheet and reflect actual AC timing limits-not theoretical maximums-ensuring reliable operation across voltage grades.
Does AT25256A-10PU-1.8 support both SPI Mode 0 and Mode 3?
Yes, AT25256A-10PU-1.8 explicitly supports SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as stated in the Features section. The device operates as a slave with fixed clock polarity and phase behavior per mode, and Mode 0 timing is fully documented in the datasheet timing diagrams.
How does the HOLD pin function in AT25256A-10PU-1.8?
The HOLD pin in AT25256A-10PU-1.8 suspends ongoing SPI communication without resetting the internal state. When asserted low while SCK is low, it places SO in high-impedance and ignores SI inputs. Resuming requires bringing HOLD high while SCK remains low-enabling precise synchronization with host MCU interrupt latency or bus arbitration.
What memory organization does AT25256A-10PU-1.8 use?
AT25256A-10PU-1.8 organizes its 256 Kbit capacity as 32,768 words of 8 bits each (32,768 × 8). Addressing uses A14–A0, with A15 as "don't care" per Table 3-6. This linear layout simplifies pointer arithmetic in firmware and aligns with standard byte-addressable MCU memory maps.
Is AT25256A-10PU-1.8 compatible with 1.8 V logic systems?
Yes, AT25256A-10PU-1.8 is explicitly rated for 1.8 V to 5.5 V operation, with DC and AC characteristics fully characterized down to 1.8 V. Its VIH/VIL thresholds scale with VCC (e.g., VIH ≥ 0.7×VCC), and SO output drive meets VOL/VOH specs at 1.8 V-enabling direct connection to 1.8 V microcontrollers without level shifters.
AT25256A-10PU-1.8 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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25256A-10PU-1.8 FAQ
1.How can I place an order for AT25256A-10PU-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256A-10PU-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-10PU-1.8 reliable?
The price and inventory of AT25256A-10PU-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-10PU-1.8 is usually 5 days.
3.What payment methods are accepted for AT25256A-10PU-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256A-10PU-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256A-10PU-1.8?
AT25256A-10PU-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256A-10PU-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-10PU-1.8?
For technical support, including AT25256A-10PU-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256A-10PU-1.8 requirements.
6.How does Aetrix verify that AT25256A-10PU-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25256A-10PU-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-10PU-1.8 meets industry standards.
7.What is the process for return or replacement of AT25256A-10PU-1.8?
All AT25256A-10PU-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25256A-10PU-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-10PU-1.8 part is unused and in its original packaging.
Return procedure for AT25256A-10PU-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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