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Microchip Technology AT25020AY1-10YI-1.8
- Part No.:
- AT25020AY1-10YI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT25020AY1-10YI-1.8.pdf
- Description:
- IC EEPROM 2KBIT SPI 20MHZ 8MAP
- Quantity:
- Payment:
- Shipping:
Inventory:2,909
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Product details
Overview
AT25020AY1-10YI-1.8 from Microchip Technology (formerly Atmel) is a 2-kbit SPI serial EEPROM organized as 256 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 automotive-grade industrial temperature range (−40°C to +85°C). It serves as nonvolatile configuration storage in microcontroller-based systems requiring low-voltage operation and robust data retention.
For engineers reviewing the AT25020AY1-10YI-1.8 datasheet, AT25020AY1-10YI-1.8 pinout, AT25020AY1-10YI-1.8 application, or AT25020AY1-10YI-1.8 equivalent, key selection criteria include 1.8 V minimum supply, 8-lead MAP (8Y1) package compatibility, SPI Mode 0/3 support, block write protection granularity, and 1 million write cycle endurance.
Technical Context
The AT25020AY1-10YI-1.8 implements a synchronous SPI slave interface with dedicated SI/SO pins, CS-controlled selection, and HOLD/WP hardware control lines. Its internal architecture includes an 8-bit instruction register, status register with BP1/BP0 block protection bits, and automatic address incrementing during sequential reads.
It supports self-timed internal write cycles (≤5 ms), requires WREN before WRITE, and allows suspension of serial communication via HOLD while preserving sequence state. The device operates exclusively as a slave and uses MSB-first data framing with op-code–driven command execution (e.g., 0x03 for READ, 0x02 for WRITE).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2048 bits (256 × 8-bit words) - fixed capacity for compact configuration or calibration data storage. |
| Supply Voltage Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 2.7 V, 3.3 V, and 5 V logic domains without level shifting. |
| Max Clock Frequency | 20 MHz at VCC = 5.0 V - supports high-speed read/write in power-optimized systems with adequate timing margins. |
| Page Write Size | 8 bytes - limits burst programming depth; exceeding overwrites lower addresses, requiring careful buffer management. |
| Write Endurance | 1 million cycles - ensures long-term reliability in firmware update or logging applications with frequent writes. |
| Data Retention | 100 years - guarantees persistent storage integrity across product lifetime without refresh. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood environments. |
| Package | 8-lead MAP (8Y1), 4.90 mm × 3.00 mm body - surface-mount, lead-free/halogen-free, dual-footprint compatible with SOIC/TSSOP layouts. |
Pinout & Package
AT25020AY1-10YI-1.8 is housed in an 8-lead Miniature Array Package (MAP, code 8Y1), measuring 4.90 mm × 3.00 mm with 0.65 mm pitch, non-leaded construction, and bottom-side pin 1 index marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be low to accept SI data and drive SO; high-Z SO when high. |
| SCK | Serial Clock | Input-only master-generated clock; defines timing for SI sampling and SO output edges (Mode 0/3 compatible). |
| SI | Serial Data Input | Master-to-slave command/address/data input; MSB-first, sampled on SCK rising edge (Mode 0). |
| SO | Serial Data Output | Slave-to-master data output; MSB-first, driven on SCK falling edge (Mode 0); high-Z when CS high or HOLD active. |
| GND | Ground | Reference return path for all I/O and power; must be low-impedance connection to system ground plane. |
| VCC | Power Supply | Primary supply rail (1.8–5.5 V); decoupling capacitor (0.1 µF) required within 10 mm of pin. |
| WP | Write Protect | Hardware lock: low disables all write operations (WREN, WRITE, WRSR); no effect on READ or RDSR. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting sequence; requires SCK low during assertion/deassertion. |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 and 3 compatibility | Interoperates with diverse MCU SPI peripherals without protocol translation or software adaptation. |
| Block write protection (BP1/BP0) | Configurable 0%, 25%, 50%, or 100% array protection via nonvolatile status register bits - prevents accidental overwrite of critical firmware or calibration data. |
| Hardware WP + software WREN/WRDI | Dual-layer write security: physical pin override plus instruction-level enable/disable - eliminates unintended writes during power transitions or noise events. |
| Self-timed 5 ms max write cycle | No external delay or polling required beyond RDSR busy-check; simplifies firmware and reduces CPU overhead during programming. |
| HOLD pin suspend function | Preserves SPI state during interrupt servicing or bus arbitration - avoids reinitialization and maintains transaction atomicity. |
| Automotive-grade qualification | Validated for −40°C to +85°C operation with lead-free/halogen-free packaging - meets AEC-Q100 stress test requirements for industrial reliability. |
Applications
| Industrial PLC Configuration Storage | Automotive ECU Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, scaling coefficients, and fault log history in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via SPI during boot and runtime parameter updates. Use Value: 1.8 V operation enables direct integration with low-power ARM Cortex-M3/M4 MCUs; 1 million endurance supports daily recalibration cycles over 10+ years. |
Use Scenario: Holding sensor offset corrections, fuel trim tables, and diagnostic trouble code (DTC) history in engine control units exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: SPI-connected EEPROM providing deterministic, fail-safe storage independent of main microcontroller power domain. Use Value: −40°C to +85°C rating and 100-year data retention ensure calibration integrity across vehicle lifetime without battery backup. |
| Medical Device Parameter Backup | Smart Meter Firmware Patch Storage |
Use Scenario: Retaining user-adjusted therapy settings, alarm thresholds, and usage logs in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, low-voltage serial memory supporting HIPAA-compliant audit trails and regulatory traceability. Use Value: Hardware WP pin prevents tampering during field service; 8-byte page writes minimize energy per update in battery-powered devices. |
Use Scenario: Storing signed firmware patches and cryptographic keys for over-the-air (OTA) updates in utility smart meters with 15+ year field life. IC Role / Device Role / Timing Role: Trusted configuration store enabling secure boot validation and rollback protection. Use Value: Block protection (BP1/BP0) isolates key storage region from application code updates; 1.8 V compatibility reduces power supply complexity in meter SoC designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DRMN6TP/K | 256 Kbit (32K × 8), 20 MHz, 1.8–5.5 V, same 8Y1 MAP package, but supports additional SPI modes (1,2) and has faster 4 ms write cycle. | Higher density suits larger configuration sets; extra mode flexibility eases migration from legacy SPI masters. | Select when >2 kbit capacity or broader SPI mode coverage is required; verify HOLD/WP pin behavior matches AT25020AY1-10YI-1.8 timing. |
| BR25G256FJ-WE2 | 256 Kbit, 20 MHz, 1.6–5.5 V, 8-lead TSSOP (8A2), built-in error correction (ECC), 3 million write cycles, 40-year retention. | ECC support improves reliability in high-radiation or long-life deployments; wider voltage range accommodates brownout conditions. | Prefer for mission-critical infrastructure where bit errors must be corrected; note TSSOP footprint differs from MAP - PCB redesign required. |
Compared with M95256-DRMN6TP/K and BR25G256FJ-WE2, the AT25020AY1-10YI-1.8 offers optimal cost and footprint efficiency for sub-4 kbit use cases, retains full 1.8 V compatibility and automotive qualification, and delivers proven interoperability with legacy Atmel/Microchip ecosystem designs without ECC overhead.
Availability
AT25020AY1-10YI-1.8 is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive ECU calibration data, medical device parameter backup, and smart meter firmware patch storage requiring stable component supply and long-term lifecycle assurance.
Supply support for AT25020AY1-10YI-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 a focus on embedded control and connectivity.
The AT25020AY1-10YI-1.8 belongs to Microchip's AT25xxx family of SPI serial EEPROMs, designed specifically for low-voltage, high-reliability nonvolatile storage in space-constrained industrial and automotive applications.
FAQ
What is the maximum clock frequency supported by AT25020AY1-10YI-1.8?
The AT25020AY1-10YI-1.8 supports up to 20 MHz SCK frequency at VCC = 5.0 V. At 1.8 V, the maximum rated frequency is 5 MHz per AC characteristics table. Exceeding these limits may cause timing violations or data corruption during READ/WRITE operations. Always consult Table 4 in the official AT25020A datasheet for voltage-specific timing constraints when designing with AT25020AY1-10YI-1.8.
Does AT25020AY1-10YI-1.8 require external pull-up resistors on its SPI lines?
No external pull-ups are required on SI, SO, or SCK for normal operation - all are actively driven. However, CS, WP, and HOLD should be pulled high via 10 kΩ resistors to VCC to ensure defined states during power-up or MCU reset. Floating WP could inadvertently disable writes; floating CS may cause spurious commands. This guidance applies directly to AT25020AY1-10YI-1.8 in its 8Y1 MAP package.
How does block write protection work on AT25020AY1-10YI-1.8?
Block write protection on AT25020AY1-10YI-1.8 is controlled by BP1/BP0 bits in the status register (Table 8). Setting BP1/BP0 to 01 protects the upper quarter (0xC0–0xFF), 10 protects upper half (0x80–0xFF), and 11 locks the entire 256-byte array. Protection is nonvolatile and persists through power cycles. AT25020AY1-10YI-1.8 enforces this at the hardware level - WRITE instructions to protected regions are ignored even if WREN is asserted.
Can AT25020AY1-10YI-1.8 be used with SPI Mode 1 or Mode 2 controllers?
No - AT25020AY1-10YI-1.8 explicitly supports only SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as stated in its Features section. Attempting Mode 1 (CPOL = 0, CPHA = 1) or Mode 2 (CPOL = 1, CPHA = 0) will result in incorrect data sampling or clock phase misalignment. System design must configure the host MCU's SPI peripheral to match one of the two supported modes for reliable AT25020AY1-10YI-1.8 communication.
What is the purpose of the HOLD pin on AT25020AY1-10YI-1.8?
The HOLD pin on AT25020AY1-10YI-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, allowing the host MCU to service interrupts or manage bus contention. Resuming requires bringing HOLD high while SCK remains low. This preserves transaction integrity across AT25020AY1-10YI-1.8 read/write sequences.
AT25020AY1-10YI-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:
- 2Kbit
- Memory Organization:
- 256 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)
AT25020AY1-10YI-1.8 FAQ
1.How can I place an order for AT25020AY1-10YI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25020AY1-10YI-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 AT25020AY1-10YI-1.8 reliable?
The price and inventory of AT25020AY1-10YI-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 AT25020AY1-10YI-1.8 is usually 5 days.
3.What payment methods are accepted for AT25020AY1-10YI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25020AY1-10YI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25020AY1-10YI-1.8?
AT25020AY1-10YI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25020AY1-10YI-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 AT25020AY1-10YI-1.8?
For technical support, including AT25020AY1-10YI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25020AY1-10YI-1.8 requirements.
6.How does Aetrix verify that AT25020AY1-10YI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25020AY1-10YI-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 AT25020AY1-10YI-1.8 meets industry standards.
7.What is the process for return or replacement of AT25020AY1-10YI-1.8?
All AT25020AY1-10YI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25020AY1-10YI-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 AT25020AY1-10YI-1.8 part is unused and in its original packaging.
Return procedure for AT25020AY1-10YI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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