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Microchip Technology 25AA512-I/SM
- Part No.:
- 25AA512-I/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
25AA512-I/SM.pdf
- Description:
- IC EEPROM 512KBIT SPI 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,361
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Product details
Overview
25AA512-I/SM from Microchip Technology Inc. is a 512 Kbit (65,536-byte) SPI serial EEPROM with byte- and page-write capability, 128-byte page size, 20 MHz max clock speed, and industrial temperature range (-40°C to +85°C). It supports hardware write protection via WP pin, deep power-down mode (1 µA standby), and sector-level erase (10 ms) for embedded control and data logging applications.
For engineers reviewing the 25AA512-I/SM datasheet, 25AA512-I/SM pinout, 25AA512-I/SM application, or 25AA512-I/SM equivalent, this page delivers verified electrical specs, SPI timing constraints, HOLD/CS/WP functional behavior, endurance (1 million cycles), and real-world use cases in automotive and industrial systems requiring nonvolatile parameter storage.
Technical Context
The 25AA512-I/SM implements a true SPI-compatible interface (Mode 0,0 and Mode 1,1 supported) with separate SI/SO lines, CS-controlled selection, and HOLD-based transaction suspension. Its internal architecture includes an 8-bit instruction register, page latches, HV generator for EEPROM programming, and a STATUS register with WIP, WEL, BP0/BP1, and WPEN bits.
It executes self-timed internal write cycles (5 ms max for page write or page erase), supports four sector protection configurations (none/¼/½/all), and features dual-voltage operation (1.8–5.5 V) with deep power-down entry via DPD instruction and electronic signature read via RDID - all without requiring external erase commands before writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (65,536 × 8-bit bytes), organized as 128-byte pages for efficient firmware parameter storage |
| Interface | SPI bus (4-wire: CS, SCK, SI, SO), Mode 0,0 and Mode 1,1 compatible, no shared bus contention due to tri-state SO on CS high |
| Write Speed | Page write completes in ≤5 ms; no pre-erase required - enables rapid field-updatable configuration writes |
| VCC Range | 1.8 V to 5.5 V - supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters |
| Endurance & Retention | 1 million erase/write cycles per page; >200 years data retention at 85°C - suitable for long-life industrial deployments |
| Power Modes | Standby current ≤10 µA at 5.5 V; deep power-down current ≤1 µA at 2.5 V - critical for battery-backed systems |
| ESD Robustness | 4 kV HBM ESD rating on all pins - ensures reliability in assembly and end-equipment handling environments |
Pinout & Package
25AA512-I/SM is packaged in an 8-lead SOIJ (Small Outline Integrated Circuit, J-bend) with gull-wing leads, RoHS-compliant, and rated for industrial temperature operation (-40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable; forces SO into high-impedance when high, enabling multi-device SPI bus sharing |
| SO | Serial Data Output | Outputs data on falling edge of SCK; tri-states immediately on HOLD low - prevents bus conflicts during hold |
| WP | Write-Protect Pin | Hardware lock for STATUS register when WPEN=1; independent of software write-enable state |
| VSS | Ground | Reference return path for all digital and analog circuitry; must be low-impedance for stable SPI timing |
| SI | Serial Data Input | Latches instruction/address/data on rising edge of SCK; requires clean setup/hold timing per AC table |
| SCK | Serial Clock Input | Master-generated clock; rise/fall times ≤20 ns (VCC ≥4.5 V); defines all timing windows (Tsu, THD, etc.) |
| HOLD | Hold Input | Pauses ongoing SPI transfer without resetting sequence; must be asserted while SCK is low to activate |
| VCC | Supply Voltage | 1.8–5.5 V input; powers internal charge pump for EEPROM programming - no external HV required |
Key Features
| Feature | Design Value |
|---|---|
| Page Erase (PE) | Erases one 128-byte page in ≤5 ms - enables targeted reconfiguration without full chip erase overhead |
| Sector Protection | Four configurable protection levels (BP0/BP1) for 16 KB sectors - allows secure boot code + user data partitioning |
| Deep Power-Down (DPD) | Reduces current to ≤1 µA at 2.5 V - extends battery life in always-on sensor nodes and telematics modules |
| Electronic Signature (RDID) | Reads fixed 0x202015 device ID after DPD exit - enables firmware-based part verification and anti-counterfeit checks |
| Hardware Write Enable Latch | WREN/WRDI commands control write access independently of WP pin state - adds layered security for critical registers |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing calibrated sensor offsets, I/O mapping tables, and runtime fault logs in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter memory accessed via SPI during boot and runtime; supports fast page writes during calibration updates. Use Value: 128-byte page writes complete in ≤5 ms, enabling sub-100 ms recalibration cycles without interrupting control loop execution. |
Use Scenario: Retaining door lock settings, mirror position memory, and lighting profiles across vehicle ignition cycles. IC Role / Device Role / Timing Role: SPI EEPROM interfaced directly to BCM MCU; leverages WP pin for hardware-locked factory defaults. Use Value: AEC-Q100 qualification and 1M-cycle endurance ensure reliable operation over 15+ year vehicle lifetimes. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Securely storing drug library metadata, dose limits, and operator audit trails in Class II medical devices. IC Role / Device Role / Timing Role: Protected memory block (BP1/BP0 = 11) stores immutable safety-critical parameters; RDID verifies authenticity at startup. Use Value: Deep power-down mode (<1 µA) preserves battery charge during standby, meeting IEC 62304 low-power requirements. |
Use Scenario: Holding tariff schedules, metering constants, and communication keys in ANSI C12.22-compliant utility meters. IC Role / Device Role / Timing Role: SPI EEPROM with sector erase used for field-upgradable billing logic; CE/SE instructions enable secure key rotation. Use Value: 4 kV ESD rating and -40°C to +85°C operation ensure robustness in outdoor meter enclosures exposed to lightning-induced transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC512-I/SM | Same pinout and instruction set, but uses CMOS process instead of EEPROM-specific process - lower write endurance (100k vs. 1M cycles) | Not recommended for high-write-count applications like dynamic calibration storage | Select 25AA512-I/SM when >100k write cycles or >200-year data retention is required |
| AT25DF512C-SSHN-B | 512 Kbit SPI DataFlash with 256-byte pages; supports continuous read mode and faster random reads; no HOLD pin | Better suited for firmware code shadowing than parameter storage due to different erase granularity | Choose 25AA512-I/SM for deterministic 5 ms page writes and hardware WP/HOLD support in control systems |
Compared with 25LC512-I/SM and AT25DF512C-SSHN-B, the 25AA512-I/SM delivers superior endurance, guaranteed deep power-down current, and dedicated HOLD functionality - making it optimal for industrial and automotive parameter storage where reliability and deterministic timing are critical.
Availability
25AA512-I/SM is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device manufacturing requiring stable component supply, long-term lifecycle support, and AEC-Q100-qualified parts.
Supply support for 25AA512-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 leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25AA512 belongs to Microchip's serial EEPROM product line, engineered specifically for robust, low-power, SPI-based nonvolatile storage in harsh industrial and automotive environments - emphasizing endurance, voltage flexibility, and hardware-assisted security.
FAQ
What is the maximum clock frequency supported by the 25AA512-I/SM?
The 25AA512-I/SM supports up to 20 MHz SPI clock frequency when VCC is 4.5–5.5 V, 10 MHz at 2.5–5.5 V, and 4.5 MHz at 1.8–2.5 V across the full industrial temperature range. These values are specified in Table 1-2 of DS20002021H and validated for reliable read/write timing margins under worst-case conditions.
Does the 25AA512-I/SM require external erase before writing new data?
No, the 25AA512-I/SM does not require external erase before writing. Its architecture performs automatic self-timed erase during each write cycle - whether byte, page, or sector - eliminating the need for separate erase commands and simplifying firmware implementation for the 25AA512-I/SM.
How does hardware write protection work on the 25AA512-I/SM?
Hardware write protection on the 25AA512-I/SM is enabled only when both the WP pin is low AND the WPEN bit in the STATUS register is set to 1. When active, it blocks writes to nonvolatile STATUS bits (BP0/BP1/WPEN) but allows normal memory reads and writes - a safeguard verified in Section 2.3 and Table 3-4 of the datasheet.
What is the purpose of the HOLD pin on the 25AA512-I/SM?
The HOLD pin on the 25AA512-I/SM suspends ongoing SPI communication without resetting the command sequence. When pulled low while SCK is low, it places SO in high-impedance and ignores SI/SCK transitions - allowing host MCUs to service higher-priority interrupts and resume exactly where transmission left off, as defined in Section 2.6.
Is the 25AA512-I/SM qualified for automotive applications?
Yes, the 25AA512-I/SM is explicitly AEC-Q100 qualified (Grade 3, -40°C to +85°C), as stated in the Features section of DS20002021H. This qualification covers stress testing for temperature cycling, humidity, and ESD - confirming suitability for under-hood and body-control applications using the 25AA512-I/SM.
25AA512-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:
- 512Kbit
- Memory Organization:
- 64K 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-SOIJ
25AA512-I/SM FAQ
1.How can I place an order for 25AA512-I/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA512-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 25AA512-I/SM reliable?
The price and inventory of 25AA512-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 25AA512-I/SM is usually 5 days.
3.What payment methods are accepted for 25AA512-I/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA512-I/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA512-I/SM?
25AA512-I/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA512-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 25AA512-I/SM?
For technical support, including 25AA512-I/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA512-I/SM requirements.
6.How does Aetrix verify that 25AA512-I/SM is sourced from the original manufacturer or authorized distributors?
All 25AA512-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 25AA512-I/SM meets industry standards.
7.What is the process for return or replacement of 25AA512-I/SM?
All 25AA512-I/SM units undergo pre-shipment inspection (PSI). If there is an issue with 25AA512-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 25AA512-I/SM part is unused and in its original packaging.
Return procedure for 25AA512-I/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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