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Microchip Technology 25AA1024-I/SM
- Part No.:
- 25AA1024-I/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
25AA1024-I/SM.pdf
- Description:
- IC EEPROM 1MBIT SPI 20MHZ 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:707
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Product details
Overview
25AA1024-I/SM from Microchip Technology Inc. is a 1-Mbit (131,072-byte) SPI serial EEPROM with byte- and page-write capability, 256-byte page size, 20 MHz max clock (at 4.5–5.5V), industrial temperature range (–40°C to +85°C), and deep power-down current of 1 µA at 2.5V/85°C. It serves as nonvolatile configuration storage in microcontroller-based embedded systems requiring field-updatable parameters.
For engineers reviewing the 25AA1024-I/SM datasheet, 25AA1024-I/SM pinout, 25AA1024-I/SM application, or 25AA1024-I/SM equivalent, key selection criteria include SPI interface timing compliance (TCSH, TCSS, THD), write-protection granularity (32 KB sectors), endurance (1M cycles), data retention (>200 years), and RoHS/AEC-Q100 qualification for automotive and industrial use.
Technical Context
The 25AA1024-I/SM implements a full SPI Mode 0,0/Master-Slave interface with separate SI/SO lines, CS-controlled selection, and HOLD suspend functionality. Its internal architecture includes an 8-bit instruction register, page latches, HV generator for EEPROM programming, and status register with WIP, WEL, BP0/BP1, and WPEN bits.
It supports four erase modes-byte/page write (no pre-erase), page erase (6 ms), sector erase (10 ms), and chip erase (10 ms)-all self-timed and interruptible via HOLD. Write protection is configurable per 32 KB sector using nonvolatile BP0/BP1 bits and hardware WP pin gated by WPEN bit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (131,072 bytes), organized as 512 pages × 256 bytes - enables efficient firmware parameter logging without external address decoding. |
| Interface | SPI-compatible, Mode 0,0 (CPOL=0, CPHA=0) with dedicated SI/SO - ensures plug-and-play compatibility with PIC® and most ARM Cortex-M microcontrollers. |
| Max Clock Frequency | 20 MHz at VCC ≥ 4.5V - supports high-speed read/write in bandwidth-constrained systems like motor controllers and sensor hubs. |
| Write Cycle Time | 6 ms maximum for byte or page write - defines minimum latency between successive writes; no external delay required. |
| Endurance & Retention | 1 million erase/write cycles; >200 years data retention - qualifies for long-life industrial equipment and automotive ECUs with infrequent but critical updates. |
| VCC Range | 1.8 V to 5.5 V - allows direct interfacing with 1.8 V logic, 3.3 V MCU I/O, and legacy 5 V systems without level shifters. |
| Deep Power-down Current | 1 µA at 2.5 V, 85°C - enables ultra-low-power battery-backed storage in always-on IoT edge nodes. |
Pinout & Package
25AA1024-I/SM uses an 8-lead SOIJ (Small Outline Integrated Circuit, J-bend) package with 1.27 mm pitch, compliant with JEDEC MS-012. Pin 1 is marked with a notch or dot; exposed pad is absent (unlike DFN variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable: drives device into standby when high; must be low for all SPI transactions; rising edge triggers internal write cycle completion. |
| SO | Serial Data Output | Tri-state open-drain output: data valid after SCK falling edge; enters high-Z when CS high or HOLD low - enables multi-device SPI bus sharing. |
| WP | Write-Protect Pin | Hardware lock: disables STATUS register writes when WP = low and WPEN = 1 - provides tamper-resistant configuration lockdown independent of firmware. |
| VSS | Ground | Reference return path for all digital and analog circuitry; must be low-impedance connection to avoid noise-induced write errors. |
| SI | Serial Data Input | Data latched on SCK rising edge: receives instructions (READ/WREN/PE), addresses (24-bit), and payload - requires clean setup/hold timing per AC specs. |
| SCK | Serial Clock Input | Master-generated clock: controls all data transfers; frequency limited to 20/10/2 MHz depending on VCC - dictates maximum throughput (up to 2.5 MB/s theoretical read rate). |
| HOLD | Hold Input | Bus pause control: suspends ongoing SPI sequence when pulled low during SCK low - allows host MCU to service higher-priority interrupts without reinitializing communication. |
| VCC | Supply Voltage | Power input: supports 1.8–5.5 V operation; internal regulation enables stable EEPROM programming across wide input range - eliminates need for external LDO in mixed-voltage designs. |
Key Features
| Feature | Design Value |
|---|---|
| Page Erase (6 ms) | Enables targeted reprogramming of 256-byte blocks without disturbing adjacent data - reduces wear leveling overhead in firmware update buffers. |
| Sector Write Protection (32 KB) | Four independent protection levels (none/¼/½/all) controlled by nonvolatile BP0/BP1 bits - secures bootloader regions while allowing runtime parameter updates in unprotected zones. |
| Deep Power-down Mode (1 µA) | Software-activated ultra-low-power state with automatic wake-on-RDID - extends battery life in energy-harvesting sensors and portable medical devices. |
| Electronic Signature (RDID) | Factory-programmed 16-bit ID read via RDID command - enables automated BOM verification and counterfeit detection during production programming. |
| AEC-Q100 Qualified | Stress-tested for automotive environments (Grade 3: –40°C to +85°C) - validates reliability for body control modules, ADAS sensors, and infotainment subsystems. |
Applications
| Industrial PLC Configuration Storage | Automotive ECU Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning coefficients, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile parameter archive accessed via SPI during boot and runtime; supports field updates via HMI or remote diagnostics. Use Value: Eliminates need for battery-backed SRAM; 1M endurance ensures >10 years of daily recalibration cycles in 24/7 operation. |
Use Scenario: Holding engine calibration maps, sensor offset corrections, and diagnostic trouble code (DTC) history in Tier-1 automotive ECUs. IC Role / Device Role / Timing Role: AEC-Q100-qualified persistent memory for safety-critical configuration data; accessed during power-up and closed-loop control loops. Use Value: >200-year data retention guarantees map integrity over vehicle lifetime; WP pin + BP bits prevent accidental corruption during firmware reflashing. |
| Medical Device Settings Backup | Smart Meter Firmware Parameters |
Use Scenario: Preserving user-adjustable therapy settings (e.g., infusion rate, alarm limits) in portable insulin pumps and ventilators. IC Role / Device Role / Timing Role: Low-power SPI EEPROM retaining critical operational parameters across power cycles; accessed only during setup or fault recovery. Use Value: 1 µA deep power-down current extends single-cell Li-ion battery life to >3 months in standby; RoHS compliance meets IEC 60601-1 requirements. |
Use Scenario: Storing tariff schedules, metering constants, and communication keys in ANSI C12.19-compliant smart electricity meters. IC Role / Device Role / Timing Role: Tamper-resistant configuration store with hardware write protection; updated quarterly via secure OTA channels. Use Value: Sector-level protection isolates cryptographic keys from tariff data - prevents unauthorized key extraction even if meter firmware is compromised. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSH-T | 4 Mbit density, quad SPI interface, 85 MHz max clock; no HOLD pin; requires different command set. | Better suited for high-throughput firmware storage; lacks HOLD for interrupt-safe partial writes. | Select when >1 Mbit capacity or faster read speed is required; verify SPI mode and command compatibility in firmware. |
| BR24G128FJ-WE2 | 128 Kbit (16 KB), I²C interface, 1 MHz max clock; 1.7–5.5 V supply; no sector erase or WP pin. | Lower density, simpler two-wire interface; no hardware write protection or deep power-down mode. | Choose for cost-sensitive, low-pin-count designs where SPI is unavailable and 128 KB suffices for basic settings storage. |
Compared with AT25DF041A-SSH-T and BR24G128FJ-WE2, the 25AA1024-I/SM uniquely balances 1 Mbit density, SPI Mode 0,0 compatibility, HOLD support for deterministic interrupt handling, and AEC-Q100 qualification - making it optimal for automotive and industrial control applications demanding robustness, moderate speed, and precise power management.
Availability
25AA1024-I/SM is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical infusion devices, smart meters, and IoT edge gateways requiring stable component supply across extended product lifecycles.
Supply support for 25AA1024-I/SM 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.
The 25AA1024 belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, SPI-based nonvolatile storage in automotive, industrial, and medical applications where data integrity and long-term retention are critical.
FAQ
What is the maximum SPI clock frequency supported by the 25AA1024-I/SM?
The 25AA1024-I/SM supports up to 20 MHz SPI clock frequency when VCC is 4.5–5.5 V, 10 MHz at 2.5–4.5 V, and 2 MHz at 2.0–2.5 V. These limits are defined in Table 1-2 of the DS20001836K datasheet and ensure reliable timing margin for setup/hold and output validity across voltage and temperature ranges. The 25AA1024-I/SM does not operate above 20 MHz under any condition.
Does the 25AA1024-I/SM require external pull-up resistors on its SPI lines?
No, the 25AA1024-I/SM does not require external pull-ups on SI, SO, or SCK. Its SO pin is internally tri-stated and driven actively; SI and SCK are CMOS inputs with no pull-up requirement. However, CS, WP, and HOLD should be pulled high externally (typically 10 kΩ to VCC) to ensure defined logic states during power-up and idle conditions - this is explicitly recommended in Microchip Application Note AN2297 for robust SPI EEPROM design. The 25AA1024-I/SM itself contains no internal pull-ups on these control pins.
How does write protection work on the 25AA1024-I/SM?
Write protection on the 25AA1024-I/SM operates through two independent mechanisms: software-configurable sector protection (BP0/BP1 bits in STATUS register) and hardware pin control (WP pin gated by WPEN bit). When WP = low and WPEN = 1, writes to the STATUS register are blocked - preventing accidental modification of protection settings. Sector protection divides the 1 Mbit array into four 32 KB blocks, allowing selective locking of bootloader, calibration, or user data regions. The 25AA1024-I/SM enforces both layers simultaneously; violating either causes the write to abort silently.
Can the 25AA1024-I/SM be used in a 1.8 V system?
Yes, the 25AA1024-I/SM is fully specified for 1.8 V operation across the industrial temperature range (–40°C to +85°C), with guaranteed AC timing (e.g., 2 MHz max clock) and DC characteristics (e.g., VIH1 = 0.7×VCC). It supports seamless integration into 1.8 V FPGA I/O banks, ultra-low-power MCUs like Silicon Labs EFM32, and battery-powered sensors. The 25AA1024-I/SM maintains full functionality - including deep power-down (1 µA), page write, and RDID signature read - at 1.8 V, as validated in Tables 1-1 and 1-2 of the official datasheet.
What happens to the 25AA1024-I/SM during a power loss mid-write?
The 25AA1024-I/SM incorporates built-in power-on/off data protection circuitry that monitors VCC and automatically inhibits write operations when supply voltage drops below the write-enable threshold (~1.5 V). If power fails during an internal write cycle, the device completes the ongoing page/sector erase or program operation using charge stored in on-chip capacitors - ensuring atomicity. No external capacitors or brown-out detectors are needed. This behavior is guaranteed across all 25AA1024-I/SM units and documented in the "Built-in Write Protection" feature list of DS20001836K.
25AA1024-I/SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 6ms
- 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-SOIJ
25AA1024-I/SM FAQ
1.How can I place an order for 25AA1024-I/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA1024-I/SM 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 25AA1024-I/SM reliable?
The price and inventory of 25AA1024-I/SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25AA1024-I/SM is usually 5 days.
3.What payment methods are accepted for 25AA1024-I/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA1024-I/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA1024-I/SM?
25AA1024-I/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA1024-I/SM 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 25AA1024-I/SM?
For technical support, including 25AA1024-I/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA1024-I/SM requirements.
6.How does Aetrix verify that 25AA1024-I/SM is sourced from the original manufacturer or authorized distributors?
All 25AA1024-I/SM 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 25AA1024-I/SM meets industry standards.
7.What is the process for return or replacement of 25AA1024-I/SM?
All 25AA1024-I/SM units undergo pre-shipment inspection (PSI). If there is an issue with 25AA1024-I/SM, 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 25AA1024-I/SM part is unused and in its original packaging.
Return procedure for 25AA1024-I/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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