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Microchip Technology 25LC512-E/SM
- Part No.:
- 25LC512-E/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
25LC512-E/SM.pdf
- Description:
- IC EEPROM 512KBIT SPI 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
25LC512-E/SM from Microchip Technology is a 512 Kbit (64 KB) SPI serial EEPROM with byte- and page-write capability, 128-byte page size, 20 MHz max clock speed, and deep power-down current of 1 µA at 2.5 V. It operates across -40°C to +125°C and supports hardware write protection via WP pin and STATUS register configuration for industrial and automotive systems.
For engineers reviewing the 25LC512-E/SM datasheet, 25LC512-E/SM pinout, 25LC512-E/SM application, or 25LC512-E/SM equivalent, this device serves as a drop-in nonvolatile memory solution for firmware storage, calibration data logging, and configuration retention in microcontroller-based embedded systems requiring AEC-Q100 qualification and RoHS compliance.
Technical Context
The 25LC512-E/SM implements a standard SPI Mode 0,0 interface with separate SI (MOSI) and SO (MISO) lines, CS-controlled selection, and HOLD pin for transaction suspension without sequence reset. Its internal architecture includes an 8-bit instruction register, page latches, HV generator, and 65,536-byte EEPROM array segmented into 16 sectors of 4 KB each.
It supports four erase modes-byte/page write (no pre-erase), page erase (5 ms), sector erase (10 ms), and chip erase (10 ms)-all self-timed and initiated by CS high transition after valid command/address/data sequence. 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 bytes), organized as 64 KB addressable space |
| Interface | SPI-compatible serial bus (Mode 0,0), with dedicated SI, SO, SCK, CS, WP, HOLD |
| Page Size | 128 bytes - defines maximum contiguous write length without wraparound |
| Max Clock Frequency | 20 MHz at VCC ≥ 4.5 V; 10 MHz at VCC = 2.5 V - sets maximum data throughput |
| Write Cycle Time | 5 ms typical for byte/page write - determines minimum time between 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 nonvolatile storage integrity |
| Deep Power-Down Current | 1 µA at 2.5 V, 85°C - enables ultra-low-power battery-backed operation |
Pinout & Package
25LC512-E/SM uses an 8-lead SOIJ (Small Outline Integrated Circuit, J-bend) package with lead finish matte tin, compliant with JEDEC MS-012. Pin 1 is marked with a dot or bevel; pin numbering follows standard counter-clockwise orientation when viewed top-side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable: selects device for SPI communication; forces SO to high-Z when high |
| SO | Serial Data Output | MISO line: outputs read data on falling edge of SCK; tri-states during HOLD or CS high |
| WP | Write-Protect Input | Hardware lock: disables STATUS register writes when WPEN=1 and WP=low |
| VSS | Ground | Reference return path for all digital and analog circuitry; must be low-impedance |
| SI | Serial Data Input | MOSI line: accepts instructions, addresses, and data on rising edge of SCK |
| SCK | Serial Clock Input | Synchronizes all SPI transfers; timing critical for setup/hold compliance per AC specs |
| HOLD | Hold Input | Pauses ongoing SPI sequence: SO goes high-Z immediately; resumes from same point |
| VCC | Supply Voltage | 2.5–5.5 V operating range; powers internal logic, charge pump, and memory array |
Key Features
| Feature | Design Value |
|---|---|
| Page-level write (128 B) | Enables efficient partial updates without full-sector erase overhead or latency penalty |
| Deep power-down mode | Reduces current to 1 µA - extends battery life in always-on sensor nodes and telematics units |
| Hardware write protection | Combines WP pin and nonvolatile BP0/BP1 bits to prevent accidental or malicious overwrites |
| AEC-Q100 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment |
| Electronic signature (RDID) | Provides factory-programmed 8-bit ID for automated BOM verification and counterfeit detection |
| Self-timed erase/write | Eliminates external timing control - simplifies firmware design and reduces host CPU load |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing calibration maps, fault codes, and adaptive learning parameters that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to PIC® MCU SPI port for deterministic read/write access. Use Value: AEC-Q100 qualification ensures reliability at 125°C ambient; 1M endurance supports lifetime recalibration cycles. |
Use Scenario: Retaining I/O mapping, ladder logic settings, and user-defined alarm thresholds during power loss. IC Role / Device Role / Timing Role: SPI EEPROM providing secure, low-latency parameter backup independent of main controller RAM. Use Value: Hardware write protection prevents corruption during brown-out events; deep power-down minimizes energy draw in standby. |
| Medical Infusion Pump Calibration | Smart Meter Firmware Patch Storage |
Use Scenario: Holding dose accuracy coefficients, safety limits, and usage history logs required for regulatory traceability. IC Role / Device Role / Timing Role: Tamper-resistant memory storing critical calibration data with electronic signature verification. Use Value: >200-year data retention meets FDA long-term recordkeeping mandates; WP pin enables physical lockout during service. |
Use Scenario: Staging field-upgradable firmware patches prior to atomic flash update, ensuring rollback capability. IC Role / Device Role / Timing Role: Secondary nonvolatile storage holding validated binary images outside primary flash memory. Use Value: Page erase (5 ms) and sector erase (10 ms) allow rapid patch validation and safe fallback without erasing operational code. |
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 NOR Flash; requires sector erase before write; no deep power-down mode | Higher write latency (25 ms sector erase); lacks hardware WP pin; not AEC-Q100 qualified | Choose only if firmware update frequency is low and automotive qualification is unnecessary. |
| 25AA512-I/SN | Same 512 Kbit SPI EEPROM family; Industrial temp (-40°C to +85°C); SOIC-8 package | Lower temperature grade; identical pinout and instruction set; no extended temp support | Select when cost sensitivity outweighs need for 125°C operation or SOIJ form factor. |
Compared with AT25DF512C-SSH-T and 25AA512-I/SN, the 25LC512-E/SM uniquely combines AEC-Q100 qualification, deep power-down current ≤1 µA, and hardware write protection with true byte-write capability - making it optimal for automotive and battery-constrained industrial designs where reliability and low-power persistence are mandatory.
Availability
25LC512-E/SM is available at Aetrix Electronics and suitable for automotive ECU development, industrial PLC configuration storage, medical infusion pump calibration, and smart meter firmware patch storage requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 25LC512-E/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 microcontrollers, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25LC512-E/SM belongs to Microchip's legacy serial EEPROM product line, designed specifically for robust, low-power, SPI-based nonvolatile data storage in automotive, industrial, and medical applications demanding high endurance and long-term data integrity.
FAQ
What is the operating voltage range for the 25LC512-E/SM?
The 25LC512-E/SM operates from 2.5 V to 5.5 V DC. This wide supply range allows direct interfacing with both 3.3 V and 5 V microcontrollers without level-shifting. At 2.5 V, maximum clock frequency is 10 MHz; at 4.5–5.5 V, it supports up to 20 MHz operation. The device maintains full functionality-including deep power-down and write protection-across the entire voltage range.
Does the 25LC512-E/SM support true byte-level writes without pre-erasing?
Yes, the 25LC512-E/SM supports true byte-level writes without requiring any prior erase cycle. Each write operation automatically handles internal erase-and-program sequencing. This eliminates firmware complexity associated with flash memory management and enables single-byte updates-critical for real-time parameter logging and configuration changes in systems like automotive ECUs and industrial controllers.
How does the HOLD pin function during an active SPI transaction?
The HOLD pin on the 25LC512-E/SM suspends an ongoing SPI sequence without resetting the internal state. When pulled low while SCK is low, SO immediately enters high-impedance, and SI/SCK transitions are ignored. Resuming requires pulling HOLD high while SCK remains low. This feature allows host microcontrollers to service higher-priority interrupts mid-transaction and resume precisely where paused-preserving clock count and address pointer position.
What protection mechanisms prevent unintended writes to the 25LC512-E/SM?
The 25LC512-E/SM employs three layered protections: (1) a volatile write-enable latch (WEL) set only by WREN command; (2) nonvolatile block protection bits (BP0/BP1) controlling 1/4, 1/2, or full-array write lock; and (3) hardware write-protection enabled when WP pin is low and WPEN bit is set. All three must align for a write to succeed-ensuring robust defense against noise-induced or software-error writes.
Is the 25LC512-E/SM pin-compatible with other Microchip serial EEPROMs?
Yes, the 25LC512-E/SM shares identical 8-pin SOIJ pinout, SPI instruction set, and timing behavior with Microchip's 25LC256, 25LC1024, and 25LC2048 families. This enables scalable memory upgrades within the same PCB footprint. However, page size (128 B), endurance (1M cycles), and deep power-down current (1 µA) are specific to the 25LC512-E/SM and verified per its DS20002065D datasheet.
25LC512-E/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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIJ
25LC512-E/SM FAQ
1.How can I place an order for 25LC512-E/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC512-E/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 25LC512-E/SM reliable?
The price and inventory of 25LC512-E/SM 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/SM is usually 5 days.
3.What payment methods are accepted for 25LC512-E/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC512-E/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC512-E/SM?
25LC512-E/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC512-E/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 25LC512-E/SM?
For technical support, including 25LC512-E/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC512-E/SM requirements.
6.How does Aetrix verify that 25LC512-E/SM is sourced from the original manufacturer or authorized distributors?
All 25LC512-E/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 25LC512-E/SM meets industry standards.
7.What is the process for return or replacement of 25LC512-E/SM?
All 25LC512-E/SM units undergo pre-shipment inspection (PSI). If there is an issue with 25LC512-E/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 25LC512-E/SM part is unused and in its original packaging.
Return procedure for 25LC512-E/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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