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Microchip Technology 25AA020AT-I/ST
- Part No.:
- 25AA020AT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
25AA020AT-I/ST.pdf
- Description:
- IC EEPROM 2KBIT SPI 10MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:449
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Product details
Overview
25AA020AT-I/ST from Microchip Technology Inc. is a 2 Kbit (256 × 8) SPI-compatible serial EEPROM with 1.8–5.5 V supply range, 10 MHz max clock frequency, and industrial temperature rating (−40°C to +85°C). It features write page mode (16-byte pages), hardware write protection via WP pin, and HOLD functionality for interrupt-safe bus suspension - used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.
For engineers reviewing the 25AA020AT-I/ST datasheet, 25AA020AT-I/ST pinout, 25AA020AT-I/ST application, or 25AA020AT-I/ST equivalent, key selection criteria include SPI timing compliance at 1.8 V, page-write boundary handling, WP/HOLD pin behavior under voltage transitions, and endurance validation for high-cycle logging use cases.
Technical Context
The 25AA020AT-I/ST implements a standard SPI Mode 0,0/Master-Slave interface with separate SI/SO lines and CS-controlled device selection. Its internal architecture includes an 8-bit instruction register, page latches, and HV generator for EEPROM programming - all synchronized to SCK rising/falling edges per JEDEC-compliant timing.
It supports four block protection levels (none, 1/4, 1/2, or full array) via nonvolatile BP0/BP1 bits in the STATUS register, and integrates power-on write-disable logic, WREN/WRDI command sequencing, and automatic WEL reset after each successful write - ensuring robust data integrity during brown-out or reset events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8) - provides sufficient space for boot configuration, calibration coefficients, or small firmware patches without requiring external memory expansion. |
| Interface | SPI (Mode 0,0) - compatible with PIC® and most ARM Cortex-M microcontrollers' hardware SPI peripherals without bit-banging overhead. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5 V - enables fast read/write throughput (up to ~1.25 MB/s theoretical burst read) while maintaining signal integrity on compact PCB layouts. |
| Write Cycle Time | ≤ 5 ms per byte or page - deterministic erase-and-write latency allows predictable timeout handling in real-time firmware. |
| Endurance & Retention | 1,000,000 erase/write cycles; >200 years data retention - validated for long-life applications like utility meters, industrial controllers, and automotive ECUs. |
| Supply Voltage Range | 1.8 V to 5.5 V - supports direct interfacing with both 1.8 V logic domains and legacy 5 V systems without level-shifting circuitry. |
| Temperature Range | Industrial: −40°C to +85°C - qualified for deployment in factory automation, HVAC controls, and outdoor IoT edge nodes. |
Pinout & Package
25AA020AT-I/ST is packaged in an 8-lead SOIC (ST suffix), with lead pitch 1.27 mm and body dimensions 3.9 mm × 4.9 mm. Pin 1 is marked by laser indentation; package is Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable: drives device into active state only when low; high-Z SO output when high - enables multi-device SPI bus sharing. |
| SO (Pin 2) | Serial Data Output | Tri-state output updated on SCK falling edge - requires no external pull-up; supports daisy-chaining in multi-slave configurations. |
| WP (Pin 3) | Write-Protect Pin | Hardware lock: low = blocks all writes to memory and STATUS register regardless of WEL state - critical for fail-safe field updates. |
| VSS (Pin 4) | Ground Reference | Primary return path for all I/O and core logic - must be low-impedance connection to avoid noise coupling into SPI timing margins. |
| SI (Pin 5) | Serial Data Input | Data, address, and instruction input sampled on SCK rising edge - supports MSb-first protocol alignment with standard SPI master implementations. |
| SCK (Pin 6) | Serial Clock Input | Master-generated clock synchronizing all transfers - rise/fall times ≤ 100 ns required for 10 MHz operation at 5.5 V. |
| HOLD (Pin 7) | Hold Input | Pauses ongoing SPI transaction without resetting state - allows host MCU to service higher-priority interrupts and resume seamlessly. |
| VCC (Pin 8) | Supply Voltage | Core power rail: powers EEPROM array, logic, and I/O buffers - bypass capacitor (0.1 µF) required within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Mode (16 bytes) | Reduces write time per byte by up to 15× vs. individual byte writes - essential for efficient firmware patching or bulk sensor calibration storage. |
| Hardware Write Protection (WP pin) | Prevents accidental overwrites during power transients or software faults - operates independently of STATUS register settings and WEL latch state. |
| HOLD Functionality | Enables deterministic SPI bus arbitration without retransmission - eliminates race conditions when servicing time-critical interrupts in real-time OS environments. |
| Four-Level Block Protection | Allows selective locking of upper 1/4 (C0h–FFh), upper 1/2 (80h–FFh), or full array (00h–FFh) - supports secure bootloader partitioning and user-configurable parameter zones. |
| Low-Power Operation | Standby current ≤ 5 µA at 5.5 V enables always-on configuration storage in battery-powered devices with multi-year shelf life. |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Storing calibrated offset/gain values for temperature, pressure, and humidity sensors across operating temperature range. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up initialization and periodic self-calibration routines. Use Value: Eliminates need for factory recalibration after solder reflow; retains accuracy over 200+ years per JEDEC JESD22-A117. |
Use Scenario: Holding seat position memory, mirror angle presets, and lighting configuration profiles in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: SPI slave storing user preferences with WP pin tied to ignition-switched 12 V via resistor divider for hardware lock during engine cranking. Use Value: Survives cold-cranking voltage dips to 6 V due to 1.8 V min operating voltage; withstands >4 kV ESD per HBM. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Recording dose history, alarm logs, and maintenance counters with tamper-resistant write protection. IC Role / Device Role / Timing Role: Secure audit trail storage using BP1/BP0 bits to lock last 64 bytes as read-only event log. Use Value: Meets IEC 62304 Class B software requirements for persistent data integrity; 1M cycle endurance supports >10 years of daily logging. |
Use Scenario: Storing tariff schedules, meter firmware version, and cryptographic keys in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Dual-role storage: volatile runtime parameters in unprotected pages, nonvolatile keys in BP=11 protected region. Use Value: Hardware WP pin prevents remote firmware corruption during OTA updates; 5.5 V max rating accommodates 5 V LDO ripple tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC020AT-I/ST | Requires 2.5–5.5 V supply; lacks 1.8 V operation - not suitable for ultra-low-voltage systems. | Valid only in 2.5 V+ designs; incompatible with 1.8 V I/O domains without level shifters. | Select only if system VCC never drops below 2.5 V and cost sensitivity outweighs voltage flexibility. |
| AT25020B-SSHL-T | Same 2 Kbit size, SPI interface, and SOIC-8 package; rated for −40°C to +85°C but specifies 20 MHz max clock (vs. 10 MHz). | Higher speed enables faster boot loading; however, AT25020B uses different STATUS register layout and lacks HOLD pin. | Choose when maximum throughput is critical and HOLD functionality is unused; verify BP bit mapping and WRSR compatibility before migration. |
Compared with 25AA020AT-I/ST, the 25LC020AT-I/ST sacrifices 1.8 V support for identical feature set at lower cost, while the AT25020B-SSHL-T trades HOLD and status register compatibility for higher clock rate - making 25AA020AT-I/ST optimal for mixed-voltage, interrupt-resilient, and legacy-design-consistent deployments.
Availability
25AA020AT-I/ST is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended product lifecycles.
Supply support for 25AA020AT-I/ST 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, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25AA020A family was designed specifically for reliable, low-power, SPI-based nonvolatile storage in resource-constrained embedded systems - emphasizing voltage flexibility, hardware safety features, and long-term data integrity.
FAQ
What is the minimum supply voltage required for reliable operation of the 25AA020AT-I/ST?
The 25AA020AT-I/ST operates reliably down to 1.8 V across its full industrial temperature range (−40°C to +85°C), enabling direct integration with 1.8 V logic families and low-power microcontrollers without level-shifting circuitry. Below 1.8 V, read/write functions are not guaranteed per DS21833G specification.
Does the 25AA020AT-I/ST support SPI Mode 1,1 or only Mode 0,0?
The 25AA020AT-I/ST supports only SPI Mode 0,0 (CPOL = 0, CPHA = 0): clock idles low, data sampled on rising edge, and output changes on falling edge. Attempting Mode 1,1 communication will result in misaligned data reads and failed writes due to incompatible timing.
How does the HOLD pin behave during an active write cycle in the 25AA020AT-I/ST?
The HOLD pin has no effect during an internal write cycle (TWC) in the 25AA020AT-I/ST - once CS rises after a valid write sequence, the device executes the 5 ms erase-and-program operation autonomously, ignoring HOLD state changes until completion. HOLD only pauses serial communication, not internal EEPROM programming.
Can the 25AA020AT-I/ST be used in automotive applications requiring AEC-Q200 qualification?
No - the 25AA020AT-I/ST carries the "I" (Industrial) temperature grade (−40°C to +85°C) and is not AEC-Q200 qualified. For automotive use, Microchip's 25LC020A-E/ST (E-grade, −40°C to +125°C) is specified, though it also lacks formal AEC-Q200 certification; dedicated automotive EEPROMs like the 25AA020AT-E/ST would be required.
What happens if a page write crosses a 16-byte boundary in the 25AA020AT-I/ST?
If a page write command attempts to cross a 16-byte boundary (e.g., writing 16 bytes starting at address 0x0F), the 25AA020AT-I/ST wraps the data to the start of the same page (0x00), overwriting previously written bytes instead of advancing to the next page - software must enforce page-aligned writes or split multi-page transfers manually.
25AA020AT-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- 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-TSSOP
25AA020AT-I/ST FAQ
1.How can I place an order for 25AA020AT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA020AT-I/ST 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/ST reliable?
The price and inventory of 25AA020AT-I/ST 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/ST is usually 5 days.
3.What payment methods are accepted for 25AA020AT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA020AT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA020AT-I/ST?
25AA020AT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA020AT-I/ST 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/ST?
For technical support, including 25AA020AT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA020AT-I/ST requirements.
6.How does Aetrix verify that 25AA020AT-I/ST is sourced from the original manufacturer or authorized distributors?
All 25AA020AT-I/ST 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/ST meets industry standards.
7.What is the process for return or replacement of 25AA020AT-I/ST?
All 25AA020AT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 25AA020AT-I/ST, 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/ST part is unused and in its original packaging.
Return procedure for 25AA020AT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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