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Microchip Technology AT25040AY1-10YU-1.8
- Part No.:
- AT25040AY1-10YU-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT25040AY1-10YU-1.8.pdf
- Description:
- IC EEPROM 4KBIT SPI 20MHZ 8MAP
- Quantity:
- Payment:
- Shipping:
Inventory:3,223
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Product details
Overview
AT25040AY1-10YU-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, supporting 20 MHz clock rate at 5 V, featuring 8-byte page write mode and hardware/software write protection via WP pin and status register. It is used in industrial control systems for storing calibration data, configuration settings, and firmware patches.
For engineers reviewing the AT25040AY1-10YU-1.8 datasheet, AT25040AY1-10YU-1.8 pinout, AT25040AY1-10YU-1.8 application, or AT25040AY1-10YU-1.8 equivalent, key selection criteria include low-voltage operation down to 1.8 V, 1 million write cycles endurance, 100-year data retention, TSSOP-compatible 8-lead Ultra Thin mini-MAP (MLP 2×3) package, and SPI Mode 0/3 compatibility with microcontroller host interfaces.
Technical Context
The AT25040AY1-10YU-1.8 implements a synchronous serial peripheral interface (SPI) slave architecture with separate SI/SO lines, CS-controlled selection, and HOLD pin for pausing communication without reset. Its internal block write protection uses nonvolatile BP1/BP0 bits to lock 1/4, 1/2, or full memory array.
It features self-timed write cycles (≤5 ms), a dedicated status register (RDY/WEN/BP bits), and dual write enable/disable instructions (WREN/WRDI). The device supports both hardware (WP pin) and software (WRSR) data protection, and operates across −40°C to +85°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit words) - sufficient for firmware metadata, sensor calibration tables, and device identity storage in space-constrained embedded nodes. |
| Supply Voltage Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V logic families and backward compatibility with 3.3 V/5 V systems without level shifters. |
| Max Clock Frequency | 20 MHz at VCC = 5 V - supports high-throughput configuration loading in real-time control loops and boot-time parameter retrieval. |
| Write Endurance | 1 million write cycles - ensures reliable field updates over 10+ years in applications with daily parameter logging or calibration adjustments. |
| Data Retention | 100 years at 25°C - guarantees long-term integrity of stored calibration coefficients, security keys, and manufacturing traceability data. |
| Page Write Size | 8 bytes - minimizes bus occupancy during partial memory updates while avoiding excessive overhead from single-byte writes. |
| Operating Temperature | −40°C to +85°C - qualified for deployment in industrial automation, automotive body electronics, and outdoor metering equipment. |
Pinout & Package
AT25040AY1-10YU-1.8 uses an 8-lead Ultra Thin mini-MAP (MLP 2×3 mm, 0.5 mm pitch, DFN-style dual no-lead package) per JEDEC MO-229, with wettable flank leads for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be driven low to initiate SPI communication and return high to latch write commands or terminate read sequences. |
| SCK | Serial Clock | Master-generated clock input; timing-critical for setup/hold compliance; supports modes 0 and 3 (CPOL=0/1, CPHA=0/1). |
| SI | Serial Data Input | Input-only line for op-codes, addresses, and write data; MSB-first transmission required per SPI protocol. |
| SO | Serial Data Output | Output-only line for read data and status register contents; tri-stated when CS is high or during HOLD assertion. |
| GND | Ground Reference | Primary return path for VCC and I/O signals; requires low-impedance PCB connection to minimize noise coupling into EEPROM logic. |
| VCC | Power Supply | Single-supply input supporting 1.8–5.5 V; bypass capacitor (0.1 µF ceramic) mandatory near package for stable read/write margins. |
| WP | Write Protect | Hardware lock: pulled low to disable all write operations including WREN, WRITE, and WRSR-prevents accidental corruption during power transitions. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer (read or write) without resetting internal address counter; requires SCK low before assertion for deterministic behavior. |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Enables interoperability with diverse microcontrollers (e.g., STM32, PIC, MSP430) without protocol translation or firmware adaptation. |
| Block Write Protection | Configurable via status register to protect 0%, 25%, 50%, or 100% of memory-critical for safeguarding bootloader sectors or factory-calibrated parameters. |
| Self-timed Write Cycle | Eliminates need for external write timing control or polling delay loops; internal 5 ms max cycle completes autonomously after CS high. |
| Low Standby Current | 0.1 µA at 1.8 V (ISB1) - extends battery life in always-on IoT sensors and portable diagnostic tools where EEPROM remains powered between wake events. |
| Industrial Temp Range | −40°C to +85°C operation confirmed per datasheet Table 3 - validated for use in motor drives, PLC I/O modules, and smart grid endpoints without derating. |
Applications
| Industrial Sensor Calibration | Smart Meter Configuration Storage |
|---|---|
Use Scenario: Storing temperature, pressure, or humidity sensor offset/gain coefficients during factory calibration and field recalibration. IC Role / Device Role / Timing Role: Nonvolatile parameter repository accessed at power-up and during maintenance mode; SPI interface synchronized to host MCU clock. Use Value: Enables one-time calibration per unit with 100-year retention, eliminating need for external backup batteries or supercapacitors. | Use Scenario: Holding tariff schedules, billing registers, communication protocol settings, and tamper-event logs in electricity/water/gas meters. IC Role / Device Role / Timing Role: Secure, write-protected configuration store updated infrequently but requiring guaranteed persistence across 15+ year deployments. Use Value: Block protection prevents overwrite of critical billing data; 1M endurance supports >1000 firmware updates over lifetime. |
| Automotive Body Control Module | Medical Device Settings Backup |
Use Scenario: Saving seat/mirror position memory, lighting profiles, and door lock preferences in BCMs compliant with AEC-Q100 stress testing. IC Role / Device Role / Timing Role: Low-voltage (1.8 V) EEPROM interfaced directly to 1.8 V CAN transceiver logic supply; accessed during ignition-on initialization. Use Value: Qualified for −40°C to +85°C operation and RoHS-compliant packaging meets automotive environmental requirements without derating. | Use Scenario: Retaining user-adjustable therapy parameters, alarm thresholds, and usage history in portable infusion pumps and glucose monitors. IC Role / Device Role / Timing Role: Safety-critical nonvolatile storage isolated from main processor domain; write-disabled by default until authenticated service mode entry. Use Value: Hardware WP pin + software status register locking provides dual-layer protection against unintended writes during ESD events or brown-out conditions. |
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, SOIC-8 package (not MLP 2×3); identical timing and instruction set. | Requires PCB layout change due to SOIC-8 footprint vs. MLP 2×3; no wettable flanks for AOI. | Select if existing SOIC-8 land pattern is fixed and lead-free RoHS compliance is required (same "U" suffix meaning). |
| BR24G04FJ-WE2 | 4-Kbit I²C EEPROM, 1.7–5.5 V, 400 kHz standard / 1 MHz fast-mode; different bus protocol and pinout (SCL/SDA instead of SCK/SI/SO). | Requires firmware rework for I²C driver integration and pull-up resistor placement; no HOLD or WP pins. | Choose only when system already uses I²C infrastructure and SPI bus is unavailable or congested. |
Compared with M95040-DRMN6TP/K and BR24G04FJ-WE2, AT25040AY1-10YU-1.8 offers MLP 2×3 package for ultra-compact designs, native SPI Mode 0/3 support without protocol translation, and dual hardware/software write protection-making it optimal for new space- and reliability-critical industrial layouts despite being marked "not recommended for new designs" due to legacy roadmap status.
Availability
AT25040AY1-10YU-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and automotive body control module designs requiring stable component supply and long-term obsolescence management.
Supply support for AT25040AY1-10YU-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 capabilities.
The AT25040AY1-10YU-1.8 belongs to Microchip's legacy AT25xxx serial EEPROM product line, designed specifically for low-power, low-voltage embedded systems requiring robust nonvolatile storage with minimal pin count and board area.
FAQ
What is the maximum clock frequency supported by AT25040AY1-10YU-1.8 at 1.8 V supply?
At VCC = 1.8 V, the AT25040AY1-10YU-1.8 supports up to 5 MHz SCK frequency per Table 4 AC Characteristics. This ensures reliable SPI communication in ultra-low-power applications such as battery-powered sensors while maintaining timing margin across temperature and voltage variation.
Does AT25040AY1-10YU-1.8 support SPI Mode 1 or Mode 2?
No, AT25040AY1-10YU-1.8 explicitly supports only SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1) as stated in the Features section. Attempting Mode 1 or Mode 2 will result in incorrect data sampling and command misinterpretation.
How is write protection implemented on AT25040AY1-10YU-1.8?
AT25040AY1-10YU-1.8 implements dual-layer write protection: hardware-level via the WP pin (low = all writes disabled), and software-level via BP0/BP1 bits in the status register (configurable 0%, 25%, 50%, or 100% array lock). Both mechanisms operate independently and concurrently.
What package type does AT25040AY1-10YU-1.8 use, and is it RoHS compliant?
AT25040AY1-10YU-1.8 uses an 8-lead Ultra Thin mini-MAP (MLP 2×3 mm, DFN-style) package with NiPdAu lead finish. The "U" suffix confirms it is lead-free and RoHS compliant per JEDEC standards and Microchip's green packaging initiative.
Is AT25040AY1-10YU-1.8 suitable for automotive applications?
While AT25040AY1-10YU-1.8 is rated for −40°C to +85°C industrial temperature range and listed as "automotive devices available" in the datasheet, it is not AEC-Q100 qualified. For automotive use, Microchip recommends the AEC-Q100 qualified AT25040AN-10SU-1.8 (SOIC-8) or AT25040AY6-10YH-1.8 (MLP 2×3 with NiPdAu finish).
AT25040AY1-10YU-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)
AT25040AY1-10YU-1.8 FAQ
1.How can I place an order for AT25040AY1-10YU-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040AY1-10YU-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 AT25040AY1-10YU-1.8 reliable?
The price and inventory of AT25040AY1-10YU-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 AT25040AY1-10YU-1.8 is usually 5 days.
3.What payment methods are accepted for AT25040AY1-10YU-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040AY1-10YU-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040AY1-10YU-1.8?
AT25040AY1-10YU-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040AY1-10YU-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 AT25040AY1-10YU-1.8?
For technical support, including AT25040AY1-10YU-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040AY1-10YU-1.8 requirements.
6.How does Aetrix verify that AT25040AY1-10YU-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25040AY1-10YU-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 AT25040AY1-10YU-1.8 meets industry standards.
7.What is the process for return or replacement of AT25040AY1-10YU-1.8?
All AT25040AY1-10YU-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25040AY1-10YU-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 AT25040AY1-10YU-1.8 part is unused and in its original packaging.
Return procedure for AT25040AY1-10YU-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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