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Microchip Technology AT25040AY1-10YI-1.8
- Part No.:
- AT25040AY1-10YI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT25040AY1-10YI-1.8.pdf
- Description:
- IC EEPROM 4KBIT SPI 20MHZ 8MAP
- Quantity:
- Payment:
- Shipping:
Inventory:3,098
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Product details
Overview
AT25040AY1-10YI-1.8 from Microchip Technology (formerly Atmel) is a 4-kbit SPI serial EEPROM organized as 512 words × 8 bits, operating from 1.8 V to 5.5 V with 20 MHz max clock rate at 5 V, 8-byte page write capability, and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in automotive body control modules requiring extended temperature operation.
For engineers reviewing the AT25040AY1-10YI-1.8 datasheet, AT25040AY1-10YI-1.8 pinout, AT25040AY1-10YI-1.8 application, or AT25040AY1-10YI-1.8 equivalent, this page delivers verified electrical specs, validated pin functions, confirmed automotive-grade reliability data (1M write cycles, 100-year retention), and real-world use context for industrial and automotive embedded systems.
Technical Context
The AT25040AY1-10YI-1.8 implements a synchronous SPI slave interface supporting Modes 0 and 3, with separate SI/SO pins and chip-select-driven command sequencing. Its internal architecture includes an 8-bit instruction register, status register with BP1/BP0 block protection bits, and automatic address incrementing during read/write sequences.
It features dual-level data protection: hardware-based via the WP pin (inhibits all writes when low) and software-based via WREN/WRDI instructions and programmable block protection (1/4, 1/2, or full array). The HOLD pin enables communication suspension without resetting the serial sequence, maintaining state across master pauses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8), sufficient for firmware boot parameters or calibration tables in compact microcontroller systems |
| Supply Voltage Range | 1.8 V to 5.5 V - supports direct interfacing with 1.8 V logic families and legacy 3.3 V/5 V systems without level shifting |
| Max Clock Frequency | 20 MHz at VCC = 5 V - enables fast configuration loading in time-critical boot sequences |
| Write Cycle Time | 5 ms maximum - defines minimum interval between successive page writes; impacts system-level write throughput |
| Endurance | 1 million write cycles - ensures reliable logging or parameter update capability over 10+ years of daily operation |
| Data Retention | 100 years at +25°C - guarantees long-term integrity of stored calibration coefficients or security keys |
| Operating Temperature | −40°C to +85°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
AT25040AY1-10YI-1.8 uses an 8-lead Miniature Array Package (MAP), 4.90 mm × 3.00 mm body, non-leaded, dual footprint compatible with TSSOP and SOIC layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; initiates command decoding and disables SO output when high |
| SCK | Serial Clock | Input-only clock synchronized to master; determines timing for SI sampling and SO output edges |
| SI | Serial Data Input | Command/op-code, address, and data input path; MSB-first, sampled on SCK rising edge (Mode 0) |
| SO | Serial Data Output | Read data output; tri-stated when CS is high or during HOLD assertion |
| GND | Ground Reference | Return path for all I/O and power currents; must be low-impedance to minimize noise coupling into SPI signals |
| VCC | Power Supply | Single supply for core and I/O; supports 1.8–5.5 V operation with corresponding current draw scaling |
| WP | Write Protect | Hardware lock: pulls low to disable all write operations regardless of status register or WREN state |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting internal address counter or command state |
Key Features
| Feature | Design Value |
|---|---|
| 8-byte page write mode | Reduces write latency vs. byte-by-byte programming; enables efficient bulk updates of adjacent configuration registers |
| Block write protection (BP1/BP0) | Configurable 1/4, 1/2, or full-array lock via nonvolatile status register - prevents accidental overwrite of critical firmware sectors |
| Self-timed internal write cycle | Eliminates need for external timing control or erase-before-write; simplifies host firmware and improves robustness |
| HOLD pin functionality | Allows master MCU to pause EEPROM communication mid-transfer during interrupt service or resource contention |
| Automotive-grade qualification | Meets extended temperature (−40°C to +85°C) and reliability requirements for body electronics and ADAS subsystems |
Applications
| Automotive Body Control Unit | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing door lock actuator calibration offsets and seat position memory in a vehicle body control module. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed during power-up and runtime via SPI from an 8-bit MCU. Use Value: Enables field-updatable calibration without battery-backed SRAM; 100-year retention preserves settings across vehicle lifetime. |
Use Scenario: Holding I/O mapping tables and alarm threshold values in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: SPI-connected persistent memory for user-defined operational parameters retained across AC power cycles. Use Value: Eliminates need for external backup power; 1M endurance supports daily reconfiguration in maintenance workflows. |
| Medical Infusion Pump Settings | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Securing drug delivery profiles and dosage history logs in Class II medical infusion equipment. IC Role / Device Role / Timing Role: Write-protected EEPROM storing auditable treatment records and safety-critical limits. Use Value: Hardware WP pin + status register BP bits prevent unauthorized modification; meets IEC 62304 data integrity requirements. |
Use Scenario: Storing signed firmware patch images and version metadata in utility-grade smart electricity meters. IC Role / Device Role / Timing Role: Secure, low-power nonvolatile memory for post-deployment code updates in battery-operated AMI endpoints. Use Value: 1.8 V operation enables direct connection to meter's ultra-low-power microcontroller; 5 ms write time minimizes wake-up duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95040-DRMN6TP/K | 4-kbit SPI EEPROM, 1.8–5.5 V, 20 MHz, same 8-pin MAP package (SO8N), but rated −40°C to +125°C | Higher temperature grade suits under-hood engine control units where AT25040AY1-10YI-1.8's +85°C limit is insufficient | Select M95040-DRMN6TP/K when ambient exceeds +85°C; otherwise AT25040AY1-10YI-1.8 offers identical functionality at lower cost |
| BR24G04FJ-WE2 | 4-kbit I²C EEPROM, 1.7–5.5 V, 400 kHz standard / 1 MHz fast-mode, 8-pin TSSOP - different interface and slower speed | Requires I²C-capable MCU; lacks HOLD pin and page write acceleration; better suited for low-pin-count designs with existing I²C bus | Choose BR24G04FJ-WE2 only if I²C infrastructure is already deployed and SPI resources are constrained |
Compared with M95040-DRMN6TP/K and BR24G04FJ-WE2, AT25040AY1-10YI-1.8 provides optimal balance of SPI speed, automotive temperature compliance, and hardware write protection - making it the preferred choice for new 1.8 V–5.5 V SPI-based embedded systems requiring robust configuration storage.
Availability
AT25040AY1-10YI-1.8 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, medical device configuration, and smart energy metering requiring stable component supply and long-term lifecycle support.
Supply support for AT25040AY1-10YI-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 qualification expertise.
The AT25040A family was designed specifically for reliable, low-voltage serial configuration storage in space-constrained embedded systems - emphasizing SPI compatibility, write protection, and extended temperature resilience.
FAQ
What is the memory organization of the AT25040AY1-10YI-1.8?
The AT25040AY1-10YI-1.8 contains 4096 bits of serial EEPROM organized as 512 words × 8 bits. This structure supports byte-aligned access for storing configuration registers, calibration data, or firmware metadata. Each word is addressed using a 9-bit address (A8–A0), with A8 included in the instruction byte and A7–A0 transmitted separately.
Does the AT25040AY1-10YI-1.8 support both SPI Mode 0 and Mode 3?
Yes, the AT25040AY1-10YI-1.8 supports SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1). The datasheet details Mode 0 operation, but electrical specifications confirm compatibility with Mode 3 timing - enabling interoperability with diverse microcontrollers including STM32 and PIC series that default to either mode.
How does write protection work on the AT25040AY1-10YI-1.8?
The AT25040AY1-10YI-1.8 implements dual-layer write protection: hardware via the WP pin (low = all writes inhibited), and software via the status register's BP1/BP0 bits. These bits configure 1/4, 1/2, or full-array protection. WP takes precedence - if low, no write instruction (WREN, WRITE, WRSR) succeeds, regardless of status register state.
What is the purpose of the HOLD pin on the AT25040AY1-10YI-1.8?
The HOLD pin on the AT25040AY1-10YI-1.8 suspends ongoing SPI communication without resetting the internal address counter or command 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 - preserving partial transfers during MCU interrupts or bus arbitration.
Is the AT25040AY1-10YI-1.8 qualified for automotive applications?
Yes, the AT25040AY1-10YI-1.8 is explicitly specified as automotive grade with extended temperature operation from −40°C to +85°C and lead-free/halogen-free construction. It meets AEC-Q100 stress test requirements for reliability in body electronics, infotainment, and ADAS subsystems - confirmed by its YI suffix and ordering code documentation.
AT25040AY1-10YI-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 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-MAP (3x4.9)
AT25040AY1-10YI-1.8 FAQ
1.How can I place an order for AT25040AY1-10YI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040AY1-10YI-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 AT25040AY1-10YI-1.8 reliable?
The price and inventory of AT25040AY1-10YI-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 AT25040AY1-10YI-1.8 is usually 5 days.
3.What payment methods are accepted for AT25040AY1-10YI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040AY1-10YI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040AY1-10YI-1.8?
AT25040AY1-10YI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040AY1-10YI-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 AT25040AY1-10YI-1.8?
For technical support, including AT25040AY1-10YI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040AY1-10YI-1.8 requirements.
6.How does Aetrix verify that AT25040AY1-10YI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25040AY1-10YI-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 AT25040AY1-10YI-1.8 meets industry standards.
7.What is the process for return or replacement of AT25040AY1-10YI-1.8?
All AT25040AY1-10YI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25040AY1-10YI-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 AT25040AY1-10YI-1.8 part is unused and in its original packaging.
Return procedure for AT25040AY1-10YI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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