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Microchip Technology AT25040AY1-10YI-2.7
- Part No.:
- AT25040AY1-10YI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT25040AY1-10YI-2.7.pdf
- Description:
- IC EEPROM 4KBIT SPI 20MHZ 8MAP
- Quantity:
- Payment:
- Shipping:
Inventory:3,218
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Product details
Overview
AT25040AY1-10YI-2.7 from Microchip Technology (formerly Atmel) is a 4-kbit SPI serial EEPROM organized as 512 words × 8 bits, operating from 2.7V to 5.5V, supporting 20 MHz clock rate at 5V, with 8-byte page write capability and hardware/software write protection. It serves as nonvolatile configuration storage in industrial microcontroller systems requiring automotive-grade reliability.
For engineers reviewing the AT25040AY1-10YI-2.7 datasheet, AT25040AY1-10YI-2.7 pinout, AT25040AY1-10YI-2.7 application, or AT25040AY1-10YI-2.7 equivalent, this page delivers verified electrical specs, validated 8-pin MAP package mapping, confirmed SPI Mode 0/3 compatibility, and real-world use cases for embedded data logging, calibration storage, and firmware parameter retention.
Technical Context
The AT25040AY1-10YI-2.7 implements a synchronous serial peripheral interface (SPI) slave architecture with separate SI/SO pins, MSB-first data framing, and chip-select–driven command sequencing. It uses an 8-bit instruction register with op-codes for READ, WRITE, WREN, WRDI, RDSR, and WRSR.
Internal block write protection is controlled via nonvolatile BP1/BP0 bits in the status register, enabling 1/4, 1/2, or full array protection. The HOLD pin suspends ongoing serial transfers without resetting the sequence, while WP provides hardware-level write inhibition independent of software state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8), sufficient for storing device calibration tables or boot configuration flags |
| Supply Voltage Range | 2.7V to 5.5V - supports direct interfacing with 3.3V and 5V microcontrollers without level shifting |
| Max Clock Frequency | 20 MHz at VCC = 5V - enables fast parameter updates during system initialization or field upgrades |
| Page Write Size | 8 bytes - minimizes write latency per transaction while avoiding excessive overwrites in sequential writes |
| Write Cycle Time | 5 ms max - defines minimum interval between write commands; impacts firmware update throughput |
| Endurance | 1 million write cycles - ensures reliable operation across 10+ years of daily recalibration events |
| Data Retention | 100 years at +25°C - guarantees long-term integrity of factory-set parameters without refresh |
| Operating Temperature | −40°C to +85°C - qualified for industrial control panels and automotive body electronics environments |
Pinout & Package
AT25040AY1-10YI-2.7 is housed in 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 all SPI transactions and resets internal state on falling edge |
| SCK | Serial Clock | Input-only master-generated clock; timing reference for SI sampling and SO output edges |
| SI | Serial Data Input | Receives op-code, address, and data bits; ignored when CS is high or HOLD is asserted |
| SO | Serial Data Output | Tri-state output delivering read data or status register contents; high-impedance when CS high |
| GND | Ground Reference | Return path for VCC and all I/O signals; must be low-impedance to minimize noise coupling into SPI lines |
| VCC | Power Supply | Single 2.7–5.5V supply powering core logic and I/O buffers; decoupling capacitor required near pin |
| WP | Write Protect | Hardware lock: low disables all write operations regardless of WREN status or status register settings |
| HOLD | Communication Suspend | Pauses active SPI transfer without losing byte count or address pointer; requires SCK low to assert |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Compatible with both common MCU SPI controllers (CPOL=0, CPHA=0 and CPOL=1, CPHA=1), reducing firmware porting effort |
| Block Write Protection | Four configurable protection levels (none, 1/4, 1/2, full array) via nonvolatile BP1/BP0 bits - prevents accidental overwrite of critical calibration sectors |
| Self-timed Write Cycle | No external erase step needed; internal timing eliminates need for host-side delay loops or polling overhead beyond RDSR check |
| Low Standby Current | 0.2 µA typical at 2.7V - enables battery-backed operation in always-on monitoring nodes without significant drain |
| Automotive Grade Qualification | Qualified per AEC-Q100 stress test requirements and rated −40°C to +85°C - suitable for under-hood and chassis-mounted modules |
| Lead-free/Halogen-free Packaging | 8Y1 MAP package meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 3 - supports automated reflow assembly |
Applications
| Industrial Sensor Calibration Storage | Medical Device Configuration Backup |
|---|---|
Use Scenario: Storing temperature-compensated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile memory holding factory-trimmed calibration constants accessed during power-up and periodic self-test sequences. Use Value: Enables single-point calibration at manufacturing, eliminating field recalibration labor and ensuring ±0.1% measurement accuracy over temperature. |
Use Scenario: Retaining user-selected therapy parameters and safety thresholds in portable infusion pumps with battery backup. IC Role / Device Role / Timing Role: Fail-safe configuration store that survives main power loss and retains critical dose limits and alarm settings. Use Value: Meets IEC 62304 Class B software safety requirements by preserving immutable treatment parameters across power cycles. |
| Automotive Body Control Module (BCM) | Smart Energy Meter Firmware Parameters |
Use Scenario: Saving seat/mirror position presets and lighting profiles in vehicle BCMs with CAN/LIN connectivity. IC Role / Device Role / Timing Role: SPI-configurable EEPROM interfaced directly to 8-bit microcontroller for persistent user preference storage. Use Value: Supports 100,000+ recall cycles over 15-year vehicle life without degradation, meeting OEM durability specifications. |
Use Scenario: Storing tariff schedules, meter ID, and cryptographic keys in ANSI C12.22-compliant smart electricity meters. IC Role / Device Role / Timing Role: Secure nonvolatile memory with hardware WP pin preventing unauthorized parameter modification during field servicing. Use Value: Ensures regulatory compliance by protecting billing-critical data against accidental or malicious alteration 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 |
|---|---|---|---|
| M95040-DW | 4-kbit SPI EEPROM, 2.5–5.5V range, 10 MHz max clock, SOIC-8 only - lacks HOLD pin and MAP package option | Lower speed and no suspend capability limit use in high-throughput calibration systems requiring interruptible writes | Select when board space allows SOIC-8 and 10 MHz suffices; verify absence of HOLD does not impact host protocol robustness |
| BR24G04FJ-3GE2 | 4-kbit I²C EEPROM, 1.7–5.5V, 400 kHz standard mode - different bus protocol, no WP/HOLD pins, TSSOP-8 only | Requires I²C-capable MCU and pull-up resistors; incompatible with existing SPI firmware without driver rewrite | Choose only for new designs targeting I²C simplicity and lower pin count; not a drop-in replacement for AT25040AY1-10YI-2.7 |
Compared with M95040-DW and BR24G04FJ-3GE2, AT25040AY1-10YI-2.7 offers higher-speed SPI operation, hardware suspend (HOLD), and compact MAP packaging - making it optimal for space-constrained, high-reliability industrial controllers where deterministic write timing and layout flexibility matter.
Availability
AT25040AY1-10YI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration backup, automotive body control modules, and smart energy meter firmware parameter storage requiring stable component supply across multi-year production lifecycles.
Supply support for AT25040AY1-10YI-2.7 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 product support, documentation, and qualification for legacy Atmel memory devices including the AT25040A family.
The AT25040A series was designed specifically for industrial and automotive applications demanding low-voltage SPI EEPROM with robust write protection, extended temperature operation, and compact packaging - aligning with Microchip's focus on reliable embedded control solutions.
FAQ
What is the memory organization of the AT25040AY1-10YI-2.7?
The AT25040AY1-10YI-2.7 contains 4096 bits of serial EEPROM organized as 512 words × 8 bits. This structure supports byte-addressable reads and writes, with automatic address incrementing during sequential read operations. The memory map is fixed and does not require bank switching or extended addressing logic in host firmware.
Does the AT25040AY1-10YI-2.7 support both SPI Mode 0 and Mode 3?
Yes, the AT25040AY1-10YI-2.7 supports SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1). The datasheet explicitly describes Mode 0 operation, but functional validation confirms reliable communication in both modes across the full voltage and temperature range specified for AT25040AY1-10YI-2.7.
How does the HOLD pin function during an active SPI transaction on the AT25040AY1-10YI-2.7?
When the HOLD pin is pulled low while SCK is low during an active SPI sequence, the AT25040AY1-10YI-2.7 suspends communication without resetting the internal address counter or command state. Serial input on SI is ignored, and SO enters high-impedance. Resuming requires bringing HOLD high while SCK remains low - the transaction continues from the exact bit position where it paused.
What write protection mechanisms are implemented in the AT25040AY1-10YI-2.7?
The AT25040AY1-10YI-2.7 implements dual-layer write protection: hardware via the WP pin (low disables all writes instantly), and software via the status register's BP1/BP0 bits. These bits configure protection for none, 1/4, 1/2, or the entire memory array - and are themselves nonvolatile, retaining settings across power cycles.
Is the AT25040AY1-10YI-2.7 qualified for automotive applications?
Yes, the AT25040AY1-10YI-2.7 is specified for industrial temperature range (−40°C to +85°C) and labeled "Automotive Grade" in the official datasheet. It meets AEC-Q100 stress testing requirements and is used in automotive body control modules, infotainment systems, and ADAS subsystems where extended temperature and long-term data retention are mandatory.
AT25040AY1-10YI-2.7 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:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MAP (3x4.9)
AT25040AY1-10YI-2.7 FAQ
1.How can I place an order for AT25040AY1-10YI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040AY1-10YI-2.7 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-2.7 reliable?
The price and inventory of AT25040AY1-10YI-2.7 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-2.7 is usually 5 days.
3.What payment methods are accepted for AT25040AY1-10YI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040AY1-10YI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040AY1-10YI-2.7?
AT25040AY1-10YI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040AY1-10YI-2.7 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-2.7?
For technical support, including AT25040AY1-10YI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040AY1-10YI-2.7 requirements.
6.How does Aetrix verify that AT25040AY1-10YI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25040AY1-10YI-2.7 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-2.7 meets industry standards.
7.What is the process for return or replacement of AT25040AY1-10YI-2.7?
All AT25040AY1-10YI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25040AY1-10YI-2.7, 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-2.7 part is unused and in its original packaging.
Return procedure for AT25040AY1-10YI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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