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Microchip Technology AT25HP256W-10SI-1.8
- Part No.:
- AT25HP256W-10SI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25HP256W-10SI-1.8.pdf
- Description:
- IC EEPROM 256KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,791
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Product details
Overview
AT25HP256W-10SI-1.8 from Microchip Technology (formerly Atmel) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8-bit memory, supporting 1.8V to 5.5V operation, 2 MHz clock rate at 1.8V, 128-byte page write mode, and hardware/software write protection via WP pin and status register. It serves as nonvolatile storage for configuration data in low-power industrial controllers.
For engineers reviewing the AT25HP256W-10SI-1.8 datasheet, AT25HP256W-10SI-1.8 pinout, AT25HP256W-10SI-1.8 application, or AT25HP256W-10SI-1.8 equivalent, key selection considerations include 1.8V supply compatibility, SPI Mode 0/3 support, block write protection granularity (1/4, 1/2, full array), endurance of 100K write cycles, and 8-lead EIAJ SOIC (8S2) package dimensions.
Technical Context
The AT25HP256W-10SI-1.8 operates as an SPI slave with separate SI (input) and SO (output) pins, MSB-first data transfer, and no erase cycle required before write. Its internal 8-bit instruction register supports WREN, WRDI, RDSR, WRSR, READ, and WRITE op-codes.
Block write protection is implemented via nonvolatile BP0/BP1 bits in the status register, enabling protection of top 1/4 (6000–7FFFh), top 1/2 (4000–7FFFh), or entire array (0000–7FFFh); WPEN bit controls hardware write protection activation through the WP pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8-bit words) |
| Supply Voltage Range | 1.8V to 5.5V - enables direct interface with 1.8V logic systems without level shifting |
| Max Clock Frequency | 2 MHz at 1.8V - defines maximum SPI transaction speed under low-voltage operation |
| Write Endurance | 100,000 cycles - specifies guaranteed reprogrammability for firmware/configuration updates |
| Data Retention | >40 years - ensures long-term reliability of stored calibration or setup parameters |
| Page Write Size | 128 bytes - mandates aligned multi-byte writes; byte-write is not supported |
| Operating Temperature | −40°C to +85°C - qualifies for industrial ambient environments |
Pinout & Package
AT25HP256W-10SI-1.8 is packaged in an 8-lead EIAJ SOIC (8S2), 0.209" body width, with 1.27 mm lead pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; device ignores SI/SCK when high and drives SO high-impedance |
| SCK | Serial Clock Input | Synchronizes all data transfers; supports SPI Modes 0 (0,0) and 3 (1,1) |
| SI | Serial Data Input | Receives op-codes, addresses, and write data; MSB first, sampled on SCK rising edge (Mode 0) |
| SO | Serial Data Output | Drives read data and status bits; high-impedance when CS high or during HOLD |
| GND | Ground Reference | Return path for VCC and all I/O signals; must be low-impedance for noise immunity |
| VCC | Power Supply | 1.8V–5.5V input; powers internal logic and charge pump for write operations |
| WP | Write Protect | Hardware lock for status register and protected memory blocks when WPEN=1 and WP=low |
| HOLD | Communication Suspend | Pauses ongoing SPI sequence without resetting address counter; requires SCK low to assert |
Key Features
| Feature | Design Value |
|---|---|
| 128-byte Page Write Mode | Enables efficient bulk programming while preventing partial-page corruption; eliminates need for external buffering |
| Triple-Voltage Operation (1.8V/2.7V/5V) | Supports seamless integration across mixed-voltage systems - e.g., 1.8V MCU core with 3.3V peripherals |
| Nonvolatile Block Protection Bits | BP0/BP1 retain protection settings across power cycles, eliminating boot-time reconfiguration overhead |
| Separate WP Pin + Software Control | Provides redundant protection layers: hardware lock (WP) and software-configurable granularity (WRSR) |
| HOLD Pin Functionality | Allows master MCU to temporarily halt EEPROM communication during interrupt service without losing context |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during startup and runtime parameter updates via SPI. Use Value: Ensures deterministic boot behavior and field-upgradable settings without battery backup or external FRAM. |
Use Scenario: Retaining sensor offset/gain coefficients and patient-specific therapy parameters in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, low-power data retention element interfaced to ARM Cortex-M0+ microcontroller over SPI. Use Value: Meets IEC 62304 Class C requirements via >40-year data retention and 100K write endurance for recalibration events. |
| Smart Energy Meter Firmware Patching | Automotive Body Control Module Settings |
Use Scenario: Holding encrypted firmware patch metadata and version stamps in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: SPI-connected secure storage for verified update payloads and rollback counters. Use Value: Enables field-deployable security patches using hardware write protection to prevent tampering with critical flags. |
Use Scenario: Saving user preferences (window position, mirror angle) and diagnostic fault logs in 12V automotive BCMs. IC Role / Device Role / Timing Role: Low-quiescent-current (0.1 µA standby at 1.8V) nonvolatile memory powered from always-on rail. Use Value: Maintains settings across ignition cycles with minimal parasitic drain, meeting ISO 16750-2 cold-cranking requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-WMN6TP | 256 Kbit, 1.8V–5.5V, 20 MHz max (5V), 8-lead SOIC, but uses standard JEDEC SOIC footprint (not EIAJ) | Higher clock rate at 5V; lacks HOLD pin - unsuitable for interrupt-driven suspend use cases | Select if system operates at 5V and requires faster reads; verify PCB pad layout compatibility with JEDEC vs. EIAJ SOIC |
| BR25H256FJ-WE2 | 256 Kbit, 1.7V–5.5V, 10 MHz max (3.3V), 8-lead TSSOP, includes built-in error correction (ECC) and write-cycle suspension | ECC enables single-bit error detection/correction; write suspension improves real-time responsiveness | Prefer for safety-critical applications requiring data integrity assurance beyond basic EEPROM reliability |
Compared with M95256-WMN6TP and BR25H256FJ-WE2, the AT25HP256W-10SI-1.8 offers unique HOLD functionality and EIAJ SOIC packaging optimized for legacy industrial designs, while maintaining identical 1.8V operation and 128-byte page write architecture.
Availability
AT25HP256W-10SI-1.8 is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT25HP256W-10SI-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 acquired Atmel in 2016 and maintains full support for the legacy AT25HP family of SPI EEPROMs, providing long-term product availability and technical documentation.
The AT25HP series was designed specifically for high-reliability, low-voltage serial data storage in space-constrained industrial and medical systems, emphasizing robust write protection and extended data retention.
FAQ
What is the maximum clock frequency supported by AT25HP256W-10SI-1.8 at 1.8V?
The AT25HP256W-10SI-1.8 supports up to 2 MHz SCK frequency when operating at 1.8V, as specified in the AC Characteristics table. This limit ensures reliable timing margins for setup/hold and output valid times under minimum supply conditions. Exceeding this frequency may cause read/write failures or status register misreads. The AT25HP256W-10SI-1.8 datasheet explicitly defines 2 MHz as the maximum for the 1.8V–5.5V voltage range.
Does AT25HP256W-10SI-1.8 support byte-level writes, or is page write mandatory?
The AT25HP256W-10SI-1.8 supports only 128-byte page write operations - byte-level writes are not functional. Attempting to write fewer than 128 bytes within a page results in undefined data in that page. The AT25HP256W-10SI-1.8 must receive exactly 128 data bytes after the address to guarantee correct programming; partial writes will overwrite earlier bytes due to automatic address incrementing and rollover.
How does the HOLD pin function during an active SPI transaction on AT25HP256W-10SI-1.8?
During an active SPI sequence, asserting HOLD low (while SCK is low) suspends communication without resetting the internal address counter or command state. The SO pin enters high-impedance, and SI inputs are ignored. To resume, bring HOLD high while SCK remains low - the AT25HP256W-10SI-1.8 continues from the exact bit position where it paused. This behavior is confirmed in the HOLD Timing diagram and Functional Description section of the AT25HP256W-10SI-1.8 datasheet.
Can AT25HP256W-10SI-1.8 be used with SPI Mode 1 or Mode 2, or only Modes 0 and 3?
The AT25HP256W-10SI-1.8 explicitly supports only SPI Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), as stated in the Features section. It does not support Mode 1 (CPOL=0, CPHA=1) or Mode 2 (CPOL=1, CPHA=0). Using unsupported modes will result in incorrect sampling of SI or unstable SO output due to mismatched clock polarity and phase expectations in the AT25HP256W-10SI-1.8's internal logic.
What package type is used for AT25HP256W-10SI-1.8, and how does it differ from standard SOIC?
AT25HP256W-10SI-1.8 uses an 8-lead EIAJ SOIC package (drawing code 8S2), which has a 0.209" body width and conforms to EIAJ ED-7320 standards. Unlike JEDEC SOIC (e.g., 16S2), the EIAJ variant features narrower body width and different lead form - requiring specific PCB footprints. The AT25HP256W-10SI-1.8's 8S2 package is distinct from both PDIP (8P3) and Leadless Array (8CN3) variants in the same family.
AT25HP256W-10SI-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm 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:
- SPI
- Clock Frequency:
- 10 MHz
- Write Cycle Time - Word, Page:
- 10ms
- 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-SOIC
AT25HP256W-10SI-1.8 FAQ
1.How can I place an order for AT25HP256W-10SI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25HP256W-10SI-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 AT25HP256W-10SI-1.8 reliable?
The price and inventory of AT25HP256W-10SI-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 AT25HP256W-10SI-1.8 is usually 5 days.
3.What payment methods are accepted for AT25HP256W-10SI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25HP256W-10SI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25HP256W-10SI-1.8?
AT25HP256W-10SI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25HP256W-10SI-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 AT25HP256W-10SI-1.8?
For technical support, including AT25HP256W-10SI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25HP256W-10SI-1.8 requirements.
6.How does Aetrix verify that AT25HP256W-10SI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25HP256W-10SI-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 AT25HP256W-10SI-1.8 meets industry standards.
7.What is the process for return or replacement of AT25HP256W-10SI-1.8?
All AT25HP256W-10SI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25HP256W-10SI-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 AT25HP256W-10SI-1.8 part is unused and in its original packaging.
Return procedure for AT25HP256W-10SI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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