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Microchip Technology AT25320W-10SI
- Part No.:
- AT25320W-10SI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25320W-10SI.pdf
- Description:
- IC EEPROM 32KBIT SPI 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,693
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Product details
Overview
AT25320W-10SI from Microchip Technology (formerly Atmel) is a 32-Kbit SPI serial EEPROM organized as 4096 words × 8 bits, operating from 2.7V to 5.5V with 3.0 MHz clock rate at 5V, supporting SPI Modes 0 and 3, and featuring 32-byte page write and block write protection for automotive and industrial control systems.
For engineers reviewing the AT25320W-10SI datasheet, AT25320W-10SI pinout, AT25320W-10SI application, or AT25320W-10SI equivalent, key selection criteria include low-voltage operation down to 2.7V, 1 million write cycles endurance, 100-year data retention, hardware/software write protection via WP pin and status register, and compatibility with 68HC11/6805 microcontroller SPI peripherals.
Technical Context
The AT25320W-10SI functions as a slave SPI peripheral with separate SI (input) and SO (output) pins, MSB-first data framing, and no erase cycle required before write. It uses an 8-bit instruction register with op-codes for WREN, WRDI, RDSR, WRSR, READ, and WRITE.
Its timing-critical interface includes programmable block protection (BP1/BP0 bits), WPEN bit enabling hardware write protect, HOLD pin for pausing communication without reset, and READY/BUSY flag (RDY bit) accessible only via RDSR during internal write cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8-bit words) - supports firmware parameter storage in space-constrained embedded nodes |
| Supply Voltage | 2.7V to 5.5V - enables direct interfacing with 3.3V and 5V microcontrollers without level-shifting |
| Max Clock Rate | 3.0 MHz at VCC = 5.0V - allows high-throughput configuration updates in real-time control loops |
| Write Cycle Time | 5 ms typical - defines minimum interval between successive page writes in logging applications |
| Endurance | 1 million write cycles - ensures reliable operation over 10+ years in daily calibration or event-logging use cases |
| Data Retention | 100 years - guarantees nonvolatile storage integrity across product lifecycle without refresh |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
AT25320W-10SI is supplied in an 8-lead JEDEC SOIC package (8S1), 0.150" wide body, with gull-wing leads and standard SOIC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be low for all SPI transactions; high-Z SO when CS high |
| SCK | Serial Clock | Master-generated clock input; timing reference for SI sampling and SO output edges |
| SI | Serial Data Input | Asynchronous data input path for op-codes, addresses, and write data (MSB first) |
| SO | Serial Data Output | Tri-state output for read data; high-impedance when CS high or during HOLD |
| GND | Ground Reference | Return path for VCC and all I/O signals; requires low-impedance PCB plane for noise immunity |
| VCC | Power Supply | Single supply input (2.7–5.5V); powers internal logic and memory array; bypass capacitor required |
| WP | Write Protect | Hardware lock for status register and protected memory blocks when WPEN = 1 and WP = low |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting address counter; requires SCK low to assert |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode Support | Compatible with Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1) - interoperable with diverse MCU SPI controllers |
| Page Write Capability | 32-byte burst writes - reduces transaction overhead by 32× vs. byte-wise programming in configuration storage |
| Block Protection Granularity | Configurable 1/4, 1/2, or full array protection via BP1/BP0 bits - enables secure boot code partitioning |
| Write Protection Flexibility | Independent hardware (WP pin) and software (WRSR) control - allows field-upgradeable security policies |
| Self-timed Programming | No external erase cycle needed; automatic internal timing - simplifies firmware driver implementation |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing calibrated sensor offsets, actuator limits, and user preferences in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter repository accessed during power-up and runtime reconfiguration via SPI. Use Value: 100-year retention and 1M write cycles ensure reliability across decades of factory recalibration cycles. | Use Scenario: Holding door lock logic states, mirror position presets, and lighting profiles in vehicle BCMs. IC Role / Device Role / Timing Role: SPI-connected EEPROM providing secure, tamper-resistant storage for safety-critical settings. Use Value: Hardware WP pin + BP bits prevent unauthorized modification of stored configurations during service diagnostics. |
| Medical Device Calibration Data | Smart Energy Meter Firmware Parameters |
Use Scenario: Recording factory calibration coefficients and usage history in portable diagnostic instruments. IC Role / Device Role / Timing Role: Low-power serial memory retaining critical accuracy data across battery-powered operation. Use Value: 2.7V min supply and 0.1 µA standby current extend battery life while preserving traceability records. | Use Scenario: Storing tariff tables, metering constants, and communication keys in ANSI C12.19-compliant utility meters. IC Role / Device Role / Timing Role: Secure, long-life storage element interfaced to metering SoC via isolated SPI bus. Use Value: Block protection prevents accidental overwrite of revenue-grade parameters during firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95320-WMN6TP | 32 Kbit SPI EEPROM, 2.5–5.5V supply, 20 MHz max clock, 5 ms write cycle, same 8-lead SOIC package | Higher speed (20 MHz vs. 3 MHz) but identical memory organization and protection features | Select for systems requiring faster parameter loading; verify timing margins with host MCU SPI peripheral |
| BR24G32FJ-WE2 | 32 Kbit I²C EEPROM, 1.7–5.5V supply, 400 kHz standard mode, 5 ms write cycle, 8-lead TSSOP package | I²C interface instead of SPI; lacks HOLD pin and block protection granularity (only WP pin) | Choose where I²C bus is already present and simpler two-wire interface suffices; not drop-in SPI replacement |
Compared with M95320-WMN6TP and BR24G32FJ-WE2, the AT25320W-10SI offers deterministic SPI timing at lower clock rates, robust dual-mode write protection, and HOLD functionality for interrupt-safe parameter updates-making it optimal for deterministic real-time embedded systems.
Availability
AT25320W-10SI is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, medical instrumentation, and smart metering applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for AT25320W-10SI 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 qualification programs.
The AT25320W-10SI belongs to Microchip's legacy Atmel SPI EEPROM family, designed specifically for reliable, low-power nonvolatile storage in resource-constrained embedded systems where SPI interface simplicity and data integrity are critical.
FAQ
What voltage range does the AT25320W-10SI support, and how does it affect system design?
The AT25320W-10SI operates from 2.7V to 5.5V, enabling direct connection to both 3.3V and 5V microcontroller SPI buses without level shifters. This dual-voltage capability simplifies power architecture in mixed-signal systems and eliminates interface translation components, reducing BOM cost and board area. The device maintains full AC/DC specifications across this range, including 3.0 MHz clock rate at 5V and 0.1 µA standby current at 2.7V.
How does the HOLD pin function on the AT25320W-10SI, and when should it be used?
The HOLD pin on the AT25320W-10SI suspends ongoing SPI communication without resetting the internal address counter or terminating the transaction. It must be asserted low while SCK is low to pause, and de-asserted high while SCK remains low to resume. This feature is essential in real-time systems where MCU interrupts must preempt EEPROM access-ensuring data integrity and eliminating need for re-initialization or address retransmission after interrupt handling.
What protection mechanisms does the AT25320W-10SI provide against unintended writes?
The AT25320W-10SI implements three-tiered write protection: (1) software-based via WREN/WRDI instructions and status register WEN bit; (2) hardware-based via WP pin when WPEN = 1; and (3) configurable block protection (BP1/BP0) locking 1/4, 1/2, or entire memory. These layers allow independent control of boot code, calibration data, and user settings-preventing corruption during firmware updates, field service, or brown-out conditions.
Can the AT25320W-10SI be used in automotive applications, and what qualifications does it meet?
Yes, the AT25320W-10SI is rated for -40°C to +85°C operation and is part of Microchip's automotive-grade EEPROM portfolio. While the specific suffix "W" denotes industrial temperature grade, the underlying AT25320 die is qualified per AEC-Q100 stress test standards for automotive use. For production automotive applications, confirm compliance with latest AEC-Q100 Rev G requirements and consult Microchip's automotive product change notifications for qualification status of the AT25320W-10SI variant.
What is the maximum supported SPI clock frequency for the AT25320W-10SI, and how does it vary with supply voltage?
The AT25320W-10SI supports up to 3.0 MHz at VCC = 4.5–5.5V, 2.1 MHz at VCC = 2.7–5.5V, and 0.5 MHz at VCC = 1.8–5.5V. Since the AT25320W-10SI is specified for 2.7–5.5V operation, its maximum usable clock is 3.0 MHz. This voltage-dependent scaling ensures timing margin compliance across the full operating range, and designers must configure host MCU SPI peripherals accordingly-especially in multi-rail systems where VCC may vary dynamically.
AT25320W-10SI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25320W-10SI FAQ
1.How can I place an order for AT25320W-10SI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25320W-10SI 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 AT25320W-10SI reliable?
The price and inventory of AT25320W-10SI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25320W-10SI is usually 5 days.
3.What payment methods are accepted for AT25320W-10SI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25320W-10SI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25320W-10SI?
AT25320W-10SI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25320W-10SI 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 AT25320W-10SI?
For technical support, including AT25320W-10SI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25320W-10SI requirements.
6.How does Aetrix verify that AT25320W-10SI is sourced from the original manufacturer or authorized distributors?
All AT25320W-10SI 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 AT25320W-10SI meets industry standards.
7.What is the process for return or replacement of AT25320W-10SI?
All AT25320W-10SI units undergo pre-shipment inspection (PSI). If there is an issue with AT25320W-10SI, 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 AT25320W-10SI part is unused and in its original packaging.
Return procedure for AT25320W-10SI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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