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Microchip Technology 25AA020AT-I/MC
- Part No.:
- 25AA020AT-I/MC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
25AA020AT-I/MC.pdf
- Description:
- IC EEPROM 2KBIT SPI 10MHZ 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,259
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Product details
Overview
25AA020AT-I/MC from Microchip Technology Inc. is a 2 Kbit SPI Serial EEPROM with 256 × 8-bit organization, 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It supports up to 10 MHz clock frequency, 16-byte page write, and hardware write protection via WP pin - used for firmware storage, calibration data retention, and configuration memory in embedded control systems.
For engineers reviewing the 25AA020AT-I/MC datasheet, 25AA020AT-I/MC pinout, 25AA020AT-I/MC application, or 25AA020AT-I/MC equivalent, key selection criteria include SPI interface compatibility, low-voltage operation down to 1.8 V, 1 μA standby current, block-level write protection (BP0/BP1), and DFN-8 (2×3 mm) package suitability for space-constrained PCB layouts.
Technical Context
The 25AA020AT-I/MC implements a standard SPI Mode 0,0 or Mode 1,1 interface with separate SI (data in) and SO (data out) lines, controlled by CS, SCK, and HOLD. Its internal architecture includes an 8-bit instruction register, page latches, and high-voltage generator for EEPROM programming.
Write operations require explicit WREN instruction followed by CS high to latch enable state; writes are self-timed (≤5 ms), and STATUS register (WIP/WEL/BP0/BP1) enables real-time monitoring and configurable array protection (none/¼/½/all).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit) - sufficient for bootloader parameters, device ID, sensor calibration tables |
| Interface | SPI-compatible serial bus (Mode 0,0 / Mode 1,1) - interoperable with PIC, ARM Cortex-M, and ESP32 SPI peripherals |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5 V - enables fast read/write cycles without external timing logic |
| Page Size | 16 bytes - constrains burst writes to aligned boundaries; crossing page boundary wraps data within same page |
| Write Endurance | 1,000,000 erase/write cycles - supports frequent field-updatable configuration in industrial logging systems |
| Data Retention | >200 years at +25°C - ensures long-term reliability for unattended equipment without battery backup |
| Supply Voltage | 1.8–5.5 V - compatible with 1.8 V logic domains and legacy 5 V microcontrollers |
Pinout & Package
25AA020AT-I/MC is housed in an 8-lead 2×3 mm DFN package (exposed pad optional to VSS or floating), optimized for high-density PCBs. Pin mapping follows standard SPI+control layout with dedicated HOLD and WP pins for robust system-level control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable; must go high after final data bit to initiate internal write cycle |
| SO (Pin 2) | Serial Data Output | Tri-state output; data valid after falling edge of SCK; high-impedance when CS high or HOLD low |
| WP (Pin 3) | Write-Protect Input | Hardware lock: low = all writes disabled (array + STATUS); overrides WEL state |
| VSS (Pin 4) | Ground | Reference for all I/O and internal circuitry; exposed pad may be connected to VSS for thermal/EMI improvement |
| SI (Pin 5) | Serial Data Input | Latches instruction/address/data on rising edge of SCK; MSb-first protocol |
| SCK (Pin 6) | Serial Clock Input | Synchronizes all transfers; supports 10 MHz max with defined rise/fall time ≤100 ns |
| HOLD (Pin 7) | Hold Input | Pauses ongoing SPI sequence (e.g., during MCU interrupt servicing); requires SCK low to assert/deassert |
| VCC (Pin 8) | Supply Voltage | 1.8–5.5 V power rail; internal regulation enables stable EEPROM operation across wide input range |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Configurable via BP0/BP1 bits to protect none, upper 1/4 (C0h–FFh), upper 1/2 (80h–FFh), or full array - prevents accidental firmware corruption |
| Low-Power Standby | 1 μA typical at 2.5 V / +85°C - extends battery life in portable instrumentation and wireless sensors |
| Hardware Write Enable Latch | WREN/WRDI instructions required before each write; automatically reset after power-up or successful write - eliminates spurious writes during brown-out |
| Hold Function | Interrupt-safe SPI pausing without reinitialization - enables deterministic response to high-priority MCU interrupts during EEPROM access |
| Pb-Free & RoHS Compliant | Meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) - supports lead-free reflow assembly without special handling |
Applications
| Industrial Sensor Calibration Storage | Embedded Firmware Parameter Backup |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed at boot via SPI; retains values across power cycles and temperature extremes. Use Value: Eliminates need for external trimming components and enables field recalibration without hardware modification. | Use Scenario: Holding user-modifiable settings (e.g., display brightness, communication baud rate) in medical diagnostic devices. IC Role / Device Role / Timing Role: SPI-connected parameter store updated infrequently but requiring guaranteed retention over 10+ years. Use Value: Provides >200-year data retention and 1M endurance - exceeds product lifecycle requirements without wear-leveling firmware. |
| Smart Meter Configuration Memory | Automotive Body Control Module NVM |
Use Scenario: Recording tariff schedules, meter IDs, and tamper-event logs in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, low-power EEPROM interfaced to metrology SoC; WP pin tied to system security controller. Use Value: Hardware write protection prevents unauthorized configuration changes; 1.8 V operation supports energy-harvesting auxiliary power rails. | Use Scenario: Storing seat position presets and mirror adjustment profiles in automotive body control units. IC Role / Device Role / Timing Role: SPI EEPROM integrated into CAN/LIN gateway subsystem; operates across –40°C to +85°C ambient. Use Value: Industrial temp grade and 10 MHz interface ensure responsive UI updates without CPU polling overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA020A-I/SN | Same die, SOIC-8 package (3.9 × 4.9 mm); no exposed pad; higher thermal resistance | Better suited for through-hole prototyping or legacy board designs with SOIC footprints | Select when board layout lacks space constraints or requires hand-soldering compatibility |
| AT25020B-MAHL-T | 2 Kbit SPI EEPROM from Microchip (acquired Atmel); 1.8–5.5 V, 20 MHz max, 8-lead TSSOP; different instruction set timing | Higher speed and alternate package; not drop-in due to differing AC timing margins and status register bit definitions | Choose only after verifying timing compliance in target MCU SPI peripheral configuration |
Compared with 25AA020AT-I/MC, the 25AA020A-I/SN offers identical functionality in a larger SOIC package ideal for development, while AT25020B-MAHL-T provides faster clock support but requires firmware validation due to non-identical status register behavior and timing tolerances.
Availability
25AA020AT-I/MC is available at Aetrix Electronics and suitable for industrial automation, smart metering, and automotive body electronics requiring stable component supply, long-term obsolescence management, and RoHS-compliant packaging.
Supply support for 25AA020AT-I/MC 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 Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona.
The 25AA020A family delivers cost-optimized, low-power serial EEPROMs targeting embedded systems needing reliable, SPI-accessible nonvolatile storage with hardware write protection and extended temperature operation.
FAQ
What is the operating voltage range for the 25AA020AT-I/MC?
The 25AA020AT-I/MC operates from 1.8 V to 5.5 V, supporting both low-voltage microcontrollers (e.g., 1.8 V I/O domains) and legacy 5 V systems. This wide range eliminates level-shifting requirements in mixed-voltage designs and ensures stable EEPROM functionality across varying power supply conditions encountered in industrial environments.
Does the 25AA020AT-I/MC support page write operations?
Yes, the 25AA020AT-I/MC supports page write mode with a 16-byte page size. Up to 16 sequential bytes can be written in a single command, provided they reside within the same physical page (addresses ending in 0000–1111). Crossing a page boundary causes wraparound - critical for firmware update routines to validate address alignment before initiating write sequences.
How does the HOLD pin function on the 25AA020AT-I/MC?
The HOLD pin on the 25AA020AT-I/MC suspends ongoing SPI communication without resetting the transaction. When pulled low (with SCK low), SI/SO/SCK enter high-impedance states, allowing the host MCU to service higher-priority interrupts. Resuming requires bringing HOLD high while SCK remains low - enabling deterministic, low-latency interruption of EEPROM access in real-time systems using the 25AA020AT-I/MC.
What write protection mechanisms does the 25AA020AT-I/MC provide?
The 25AA020AT-I/MC provides dual-layer write protection: hardware-based via the WP pin (low = full array + STATUS register locked), and software-configurable via BP0/BP1 bits in the STATUS register (selecting none/¼/½/all array protection). The WP pin takes precedence - if low, no writes occur regardless of WEL or BP settings - ensuring fail-safe prevention of unintended firmware corruption.
Is the 25AA020AT-I/MC pin-compatible with other 25XX020A variants?
Yes, the 25AA020AT-I/MC shares identical pinout and electrical behavior with all 25XX020A family members in the same package type (e.g., DFN-8). It is functionally and physically interchangeable with 25LC020AT-I/MC in the same footprint, though the 25LC020A requires minimum 2.5 V supply - confirming VCC compatibility is essential before substitution in existing 25AA020AT-I/MC designs.
25AA020AT-I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 10 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-DFN (2x3)
25AA020AT-I/MC FAQ
1.How can I place an order for 25AA020AT-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA020AT-I/MC 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 25AA020AT-I/MC reliable?
The price and inventory of 25AA020AT-I/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25AA020AT-I/MC is usually 5 days.
3.What payment methods are accepted for 25AA020AT-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA020AT-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA020AT-I/MC?
25AA020AT-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA020AT-I/MC 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 25AA020AT-I/MC?
For technical support, including 25AA020AT-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA020AT-I/MC requirements.
6.How does Aetrix verify that 25AA020AT-I/MC is sourced from the original manufacturer or authorized distributors?
All 25AA020AT-I/MC 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 25AA020AT-I/MC meets industry standards.
7.What is the process for return or replacement of 25AA020AT-I/MC?
All 25AA020AT-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with 25AA020AT-I/MC, 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 25AA020AT-I/MC part is unused and in its original packaging.
Return procedure for 25AA020AT-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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