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Microchip Technology 25LC512-E/P
- Part No.:
- 25LC512-E/P
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
25LC512-E/P.pdf
- Description:
- IC EEPROM 512KBIT SPI 20MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,626
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Product details
Overview
25LC512-E/P from Microchip Technology 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 deep power-down mode consuming only 1 µA at 2.5V. It operates across -40°C to +125°C and supports hardware write protection via WP pin and STATUS register control for industrial and automotive systems.
For engineers reviewing the 25LC512-E/P datasheet, 25LC512-E/P pinout, 25LC512-E/P application, or 25LC512-E/P equivalent, this device delivers high-reliability nonvolatile storage with 1 million erase/write cycles, sector-level protection, and SPI-compatible timing for microcontroller-based embedded data logging, configuration storage, and firmware parameter retention.
Technical Context
The 25LC512-E/P implements a true SPI interface (Mode 0,0 and Mode 1,1 compatible) with separate SI/SO lines, CS-controlled selection, and HOLD pin for mid-sequence suspension. Its internal architecture includes an 8-bit instruction register, page latches, HV generator, and EEPROM array segmented into four 16 KB sectors.
It supports five distinct erase modes - byte write (no erase), page erase (5 ms), sector erase (10 ms), chip erase (10 ms), and deep power-down entry/exit - all self-timed and initiated by CS high transition after valid command sequences. Write enable latch (WEL) and block protection bits (BP0/BP1) enforce configurable hardware/software write security.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (65,536 × 8-bit bytes), organized as 4 sectors of 16 KB each |
| Page Size | 128 bytes - defines maximum contiguous write length without crossing physical boundary |
| Max Clock Frequency | 20 MHz at VCC ≥ 4.5V; 10 MHz at VCC ≥ 2.5V - sets SPI bus throughput limit |
| Write Cycle Time | 5 ms max for byte/page write - determines minimum time between successive write commands |
| Endurance | 1 million erase/write cycles per page - specifies usable lifetime under repeated updates |
| Data Retention | >200 years at 25°C - guarantees long-term data integrity without refresh |
| Deep Power-Down Current | 1 µA at 2.5V, 85°C - enables ultra-low-power battery-backed operation |
Pinout & Package
25LC512-E/P is supplied in 8-Lead PDIP (Plastic Dual In-line Package), with lead finish Matte Tin and RoHS-compliant construction. Pin 1 is marked with a notch or dot; package meets JEDEC MS-001 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable: selects device for SPI communication; high state forces SO to high-Z and enters Standby mode |
| SO (Pin 2) | Serial Data Output | Tri-state CMOS output: delivers read data or STATUS register contents on falling SCK edge |
| WP (Pin 3) | Write-Protect Input | Hardware lock: disables STATUS register writes when WPEN=1 and WP=low; no effect if WPEN=0 |
| VSS (Pin 4) | Ground Reference | Primary return path for all I/O and core logic; must be low-impedance connection |
| SI (Pin 5) | Serial Data Input | CMOS input: receives instructions, addresses, and write data on rising SCK edge |
| SCK (Pin 6) | Serial Clock Input | Synchronous timing reference: controls sampling (SI) and updating (SO) edges per SPI protocol |
| HOLD (Pin 7) | Hold Input | Pauses active SPI sequence: asserts high-Z on SO and ignores SI/SCK transitions until released |
| VCC (Pin 8) | Supply Voltage | 2.5–5.5V operating range: powers EEPROM core, logic, and charge pump; supports wide-input industrial rails |
Key Features
| Feature | Design Value |
|---|---|
| Page Erase / Sector Erase / Chip Erase | Enables selective memory management without full bulk erase - reduces wear and improves update efficiency |
| Hardware Write Protection (WP + WPEN) | Prevents accidental or malicious STATUS register modification while allowing runtime array access control |
| Deep Power-Down Mode | Reduces current to 1 µA at 2.5V - extends battery life in always-on monitoring and telemetry nodes |
| Electronic Signature (RDID) | Provides factory-programmed 8-bit ID for automated BOM verification and counterfeit detection during programming |
| AEC-Q100 Qualified | Validated for automotive temperature range (-40°C to +125°C) and stress testing - suitable for engine control and ADAS modules |
Applications
| Industrial Sensor Calibration Storage | Automotive ECU Configuration Memory |
|---|---|
|
Use Scenario: Storing calibrated offset/gain coefficients for temperature, pressure, and current sensors in factory-set industrial transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed at power-up and during field recalibration via SPI from host MCU. Use Value: Enables traceable, tamper-resistant calibration data retention over >200 years with 1M-cycle endurance for periodic revalidation. |
Use Scenario: Holding vehicle-specific tuning parameters, VIN-linked settings, and diagnostic fault history in engine control units. IC Role / Device Role / Timing Role: AEC-Q100-qualified EEPROM interfacing directly with PIC® or ARM-based ECUs via SPI bus. Use Value: Supports secure, sector-protected writes during dealership flash updates while preserving critical calibration data across power cycles. |
| Medical Device Parameter Backup | Smart Meter Firmware Settings |
|
Use Scenario: Retaining user-configured therapy profiles, alarm thresholds, and usage logs in portable infusion pumps and glucose monitors. IC Role / Device Role / Timing Role: Low-power SPI EEPROM providing guaranteed data persistence during battery swaps and brownout events. Use Value: Deep power-down current of 1 µA at 2.5V ensures multi-year backup operation on coin-cell batteries. |
Use Scenario: Storing tariff tables, metering constants, and communication credentials in ANSI C12.19-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, write-protected memory holding regulatory-critical data with hardware (WP) and software (BP0/BP1) locking. Use Value: Four-sector protection allows independent locking of billing vs. operational parameters - preventing unauthorized credential changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF512C-SSH-T | 512 Kbit SPI Flash (not EEPROM); requires explicit sector erase before write; no built-in WPEN/WP coordination | Lacks hardware write-protection granularity and deep power-down mode; higher endurance not guaranteed per byte | Choose only if system already uses Flash abstraction layer and can tolerate erase-before-write latency |
| 25AA512-I/P | Same pinout, 512 Kbit, but rated for Industrial (-40°C to +85°C) only; lacks AEC-Q100 qualification and extended temp support | Not qualified for under-hood automotive use; identical electrical behavior otherwise | Select 25LC512-E/P when deployment requires operation up to +125°C or automotive compliance documentation |
Compared with AT25DF512C-SSH-T and 25AA512-I/P, the 25LC512-E/P uniquely combines AEC-Q100 qualification, deep power-down, and integrated WPEN/WP hardware lock - making it the only option supporting secure, low-power, high-temp EEPROM functionality in one monolithic device.
Availability
25LC512-E/P is available at Aetrix Electronics and suitable for industrial sensor calibration storage, automotive ECU configuration memory, and medical device parameter backup requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 25LC512-E/P 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 microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25LC512-E/P belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power, SPI-based nonvolatile storage in automotive, industrial, and medical applications demanding high reliability and extended temperature operation.
FAQ
What is the operating voltage range for the 25LC512-E/P?
The 25LC512-E/P operates from 2.5V to 5.5V across its full temperature range (-40°C to +125°C). At 2.5V, maximum clock frequency is 10 MHz; at 4.5–5.5V, it supports up to 20 MHz. This wide VCC range allows direct integration with both 3.3V and 5V microcontroller systems without level-shifting.
Does the 25LC512-E/P require external erase before writing data?
No, the 25LC512-E/P does not require external erase before byte or page writes. Its EEPROM architecture performs automatic, self-timed erase during the internal write cycle. Only explicit erase commands (PE, SE, CE) are needed when overwriting protected or previously erased pages - unlike Flash devices that mandate erase-before-write.
How does hardware write protection work on the 25LC512-E/P?
Hardware write protection on the 25LC512-E/P is controlled jointly by the WP pin (Pin 3) and the WPEN bit in the STATUS register. When WPEN = 1 and WP = low, writes to nonvolatile STATUS bits (BP0, BP1, WPEN) are blocked. All other operations - including array reads, writes, and erases - remain fully functional unless sector protection bits are also set.
What is the purpose of the HOLD pin on the 25LC512-E/P?
The HOLD pin (Pin 7) on the 25LC512-E/P suspends ongoing SPI communication without resetting the sequence. When pulled low while SCK is low, it places SO in high-impedance state and ignores further SI/SCK transitions, allowing the host MCU to service higher-priority interrupts. Communication resumes immediately upon HOLD returning high.
Is the 25LC512-E/P compatible with standard SPI protocols?
Yes, the 25LC512-E/P is fully compatible with standard SPI protocols, supporting both Mode 0,0 (CPOL = 0, CPHA = 0) and Mode 1,1 (CPOL = 1, CPHA = 1). Data is sampled on the rising edge of SCK (SI) and output on the falling edge (SO), with CS acting as frame synchronization signal - matching common MCU SPI peripheral configurations.
25LC512-E/P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
25LC512-E/P FAQ
1.How can I place an order for 25LC512-E/P through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC512-E/P 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 25LC512-E/P reliable?
The price and inventory of 25LC512-E/P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25LC512-E/P is usually 5 days.
3.What payment methods are accepted for 25LC512-E/P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC512-E/P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC512-E/P?
25LC512-E/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC512-E/P 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 25LC512-E/P?
For technical support, including 25LC512-E/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC512-E/P requirements.
6.How does Aetrix verify that 25LC512-E/P is sourced from the original manufacturer or authorized distributors?
All 25LC512-E/P 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 25LC512-E/P meets industry standards.
7.What is the process for return or replacement of 25LC512-E/P?
All 25LC512-E/P units undergo pre-shipment inspection (PSI). If there is an issue with 25LC512-E/P, 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 25LC512-E/P part is unused and in its original packaging.
Return procedure for 25LC512-E/P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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