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Microchip Technology 25AA1024-I/W16K
- Part No.:
- 25AA1024-I/W16K
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
25AA1024-I/W16K.pdf
- Description:
- IC EEPROM 1MBIT SPI 20MHZ DIE
- Quantity:
- Payment:
- Shipping:
Inventory:1,210
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Product details
Overview
25AA1024-I/W16K from Microchip Technology Inc. is a 1-Mbit (131,072 × 8) SPI serial EEPROM with byte- and page-write capability, 256-byte page size, 6 ms max internal write cycle time, and industrial temperature range (–40°C to +85°C). It operates from 1.8V to 5.5V and supports up to 20 MHz clock frequency at VCC ≥ 4.5V, enabling high-speed data logging in embedded control systems.
For engineers reviewing the 25AA1024-I/W16K datasheet, 25AA1024-I/W16K pinout, 25AA1024-I/W16K application, or 25AA1024-I/W16K equivalent, key selection considerations include its deep power-down current (1 µA at 2.5V/85°C), hardware write-protection via WP pin and STATUS register, sector-level erase (10 ms), and AEC-Q100 qualification for automotive subsystems.
Technical Context
The 25AA1024-I/W16K implements an SPI Mode 0,0/Motorola-compatible interface with separate SI (data-in) and SO (data-out) lines, CS-controlled selection, and HOLD pin for transaction suspension without reset. Its internal architecture includes a 256-byte page latch, HV generator for EEPROM programming, and status register with WIP, WEL, BP0/BP1, and WPEN bits.
It supports four erase granularities-byte/page writes (no pre-erase), page erase (6 ms), sector erase (10 ms), and chip erase (10 ms)-all self-timed and interruptible only by CS deassertion. Write protection is configurable per 32 KB sector (0%, 25%, 50%, or 100% array lock) and enforced by both software (WRSR) and hardware (WP pin + 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 storage with minimal address overhead |
| Interface | SPI Mode 0,0 (CPOL=0, CPHA=0) with dedicated SI/SO - ensures interoperability with PIC® and ARM Cortex-M microcontrollers without level-shifting |
| Max Clock Frequency | 20 MHz at VCC ≥ 4.5V - supports 2.5 MB/s read throughput for real-time configuration loading |
| Write Cycle Time | 6 ms max for byte or page write - defines minimum latency between successive non-overlapping writes |
| Endurance & Retention | 1 million erase/write cycles per page; >200 years data retention - validated for mission-critical calibration storage in industrial controllers |
| Supply Voltage Range | 1.8V to 5.5V - allows direct integration into 1.8V logic domains or legacy 5V systems without regulators |
| Deep Power-down Current | 1 µA at 2.5V/85°C - enables battery-backed operation for >10-year shelf life in remote sensors |
Pinout & Package
25AA1024-I/W16K is packaged in an 8-lead DFN-S (3×2 mm, 0.5 mm pitch) with exposed pad (optional VSS connection). Pin functions are electrically identical across DFN-S, PDIP, and SOIJ variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable: drives device into standby when high; initiates command decode on falling edge - essential for multi-device SPI bus arbitration |
| SO | Serial Data Output | Tri-state open-drain output updated after SCK falling edge - allows bus sharing with other SPI peripherals without contention |
| WP | Write-Protect Input | Hardware lock: disables STATUS register writes when low + WPEN=1 - provides tamper-resistant configuration lockdown independent of firmware |
| VSS | Ground Reference | Primary return path for all I/O and core logic - must be low-impedance to maintain noise margin during 7 mA write current peaks |
| SI | Serial Data Input | Latches instruction/address/data on SCK rising edge - requires setup/hold timing compliance (e.g., 5 ns min TSU at 4.5–5.5V) |
| SCK | Serial Clock Input | Asynchronous master clock: controls all data transfers; rise/fall times ≤20 ns required for 20 MHz operation |
| HOLD | Hold Input | Pauses ongoing SPI sequence when pulled low during SCK low - preserves state for MCU interrupt servicing without reinitialization |
| VCC | Supply Voltage | Power rail for EEPROM core and I/O buffers - must remain within 1.8–5.5V during all operations including deep power-down exit |
Key Features
| Feature | Design Value |
|---|---|
| Page Erase (6 ms) | Enables rapid partial memory refresh without full chip erase - reduces firmware update time by >90% vs. legacy EEPROMs |
| Sector Write Protection (32 KB granularity) | Allows independent locking of bootloader, calibration, and user data regions - prevents accidental corruption during field firmware upgrades |
| Deep Power-down Mode (1 µA) | Eliminates standby leakage in always-on battery systems - extends coin-cell life from months to over a decade |
| AEC-Q100 Qualified | Validated for automotive grade-2 temperature (-40°C to +105°C ambient) and ESD (4 kV HBM) - suitable for body control modules and ADAS sensor nodes |
| Electronic Signature (RDID) | Provides unique 16-bit manufacturer ID and device revision - enables automated BOM verification and counterfeit detection in production test |
Applications
| Industrial PLC Configuration Storage | Automotive ECU Calibration Memory |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers with no external backup power. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via SPI during boot and runtime reconfiguration. Use Value: 1M endurance ensures >10 years of daily parameter updates; deep power-down current prevents capacitor hold-up requirements. |
Use Scenario: Retaining fuel injection timing maps, sensor offset corrections, and diagnostic trouble codes in engine control units exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: AEC-Q100-qualified persistent memory for safety-critical calibration data with hardware write-lock during CAN flash programming. Use Value: Sector protection isolates factory-calibrated values from field updates; 85°C operation matches ECU thermal envelope without derating. |
| Medical Device Usage Logs | Smart Meter Firmware Parameters |
Use Scenario: Recording sterilization cycles, operator login timestamps, and error events in portable diagnostic equipment powered by rechargeable Li-ion batteries. IC Role / Device Role / Timing Role: Low-power event logger interfaced to ARM Cortex-M0+ via SPI with HOLD pin used during BLE radio interrupts. Use Value: 1 µA deep power-down extends battery life beyond 5 years; electronic signature validates firmware authenticity during regulatory audits. |
Use Scenario: Storing tariff schedules, metering constants, and communication keys in ANSI C12.19-compliant electricity meters deployed in utility substations. IC Role / Device Role / Timing Role: Tamper-resistant configuration vault with WP pin hardwired to secure microcontroller GPIO for cryptographic key protection. Use Value: Hardware write-protection prevents unauthorized key modification; 200-year data retention meets ANSI 12.22 lifetime requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC1024-I/P | Same 1-Mbit SPI EEPROM function but in 8-lead PDIP package; identical electrical specs and instruction set | Preferred for through-hole prototyping or legacy board rework where DFN footprint unavailable | Select 25LC1024-I/P only if manual soldering or socket-based validation is required; no performance trade-off |
| AT25DF101-SSH-T | 1-Mbit SPI DataFlash with 512-byte page size, 8 ms page program time, and different command set (e.g., no RDID) | Optimized for sequential firmware image storage rather than random-access parameter logging | Choose AT25DF101-SSH-T only when migrating from legacy DataFlash designs; not drop-in compatible due to timing and instruction differences |
Compared with 25AA1024-I/W16K, 25LC1024-I/P offers identical functionality in through-hole form, while AT25DF101-SSH-T trades random-write speed and hardware write-protection for higher-density sequential storage - making 25AA1024-I/W16K optimal for mixed-access, security-sensitive embedded control.
Availability
25AA1024-I/W16K is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive ECU calibration memory, medical device usage logs, and smart meter firmware parameters requiring stable component supply across multi-year production cycles.
Supply support for 25AA1024-I/W16K 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 for industrial, automotive, and consumer markets.
The 25AA1024 belongs to Microchip's serial EEPROM product line designed for reliable, low-power nonvolatile storage in resource-constrained embedded systems requiring AEC-Q100 qualification and extended data retention.
FAQ
What is the maximum clock frequency supported by the 25AA1024-I/W16K?
The 25AA1024-I/W16K supports up to 20 MHz clock frequency when VCC is 4.5V to 5.5V, 10 MHz at 2.5V to 4.5V, and 2 MHz at 2.0V to 2.5V. These limits are defined by AC timing parameters including TCSS, TCSH, and THI, and must be verified against actual board-level signal integrity. The 25AA1024-I/W16K maintains full functionality across this voltage-scaled frequency range without firmware changes.
How does hardware write protection work on the 25AA1024-I/W16K?
Hardware write protection on the 25AA1024-I/W16K requires both the WP pin held low and the WPEN bit (bit 7 of STATUS register) set to 1. When enabled, it blocks writes to nonvolatile STATUS register bits (BP0, BP1, WPEN) but allows normal memory reads and writes. The 25AA1024-I/W16K ignores WP state unless WPEN is active, permitting flexible system-level lockout strategies.
What is the purpose of the HOLD pin on the 25AA1024-I/W16K?
The HOLD pin on the 25AA1024-I/W16K suspends ongoing SPI communication without resetting the internal state, allowing the host MCU to service higher-priority interrupts and resume from the exact point of suspension. It must be asserted while SCK is low, and SO transitions to high-impedance immediately upon HOLD low - preserving bus integrity. This behavior is fully documented in Figure 1-1 of the 25AA1024-I/W16K datasheet.
Can the 25AA1024-I/W16K perform sector erase operations?
Yes, the 25AA1024-I/W16K supports sector erase (TSE = 10 ms max) using the SE instruction (1101 1000), targeting 32 KB sectors aligned to addresses 0x00000–0x07FFF, 0x08000–0x0FFFF, 0x10000–0x17FFF, and 0x18000–0x1FFFF. Erase is blocked if the target sector is write-protected via BP0/BP1 bits. The 25AA1024-I/W16K verifies protection status before initiating erase, ensuring data integrity.
What does the Electronic Signature (RDID) instruction do on the 25AA1024-I/W16K?
The RDID instruction (1010 1011) on the 25AA1024-I/W16K releases the device from Deep Power-down mode and outputs a fixed 16-bit electronic signature (0x1F 0x84 for Microchip 1-Mbit EEPROMs) on the SO pin. This serves dual purposes: authenticating genuine Microchip silicon and confirming proper power-up sequencing. The 25AA1024-I/W16K returns to Standby mode after TREL (100 µs max) following RDID completion.
25AA1024-I/W16K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not 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:
- Die
25AA1024-I/W16K FAQ
1.How can I place an order for 25AA1024-I/W16K through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA1024-I/W16K 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/W16K reliable?
The price and inventory of 25AA1024-I/W16K 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/W16K is usually 5 days.
3.What payment methods are accepted for 25AA1024-I/W16K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA1024-I/W16K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA1024-I/W16K?
25AA1024-I/W16K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA1024-I/W16K 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/W16K?
For technical support, including 25AA1024-I/W16K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA1024-I/W16K requirements.
6.How does Aetrix verify that 25AA1024-I/W16K is sourced from the original manufacturer or authorized distributors?
All 25AA1024-I/W16K 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/W16K meets industry standards.
7.What is the process for return or replacement of 25AA1024-I/W16K?
All 25AA1024-I/W16K units undergo pre-shipment inspection (PSI). If there is an issue with 25AA1024-I/W16K, 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/W16K part is unused and in its original packaging.
Return procedure for 25AA1024-I/W16K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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