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Microchip Technology 25LC512-I/SN
- Part No.:
- 25LC512-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25LC512-I/SN.pdf
- Description:
- IC EEPROM 512KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:919
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Product details
Overview
25LC512-I/SN 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 industrial temperature range (–40°C to +85°C). It operates from 2.5V to 5.5V, supports hardware write protection via WP pin, and delivers 1 million erase/write cycles with >200-year data retention - used in firmware storage, calibration data logging, and configuration memory for embedded controllers.
For engineers reviewing the 25LC512-I/SN datasheet, 25LC512-I/SN pinout, 25LC512-I/SN application, or 25LC512-I/SN equivalent, key selection criteria include SPI timing compliance at 20 MHz, deep power-down current (≤2 µA), sector-level write protection granularity (16 KB per sector), and SOIC-8 (SN) package compatibility with legacy board layouts.
Technical Context
The 25LC512-I/SN implements a true SPI Mode 0,0 interface with separate SI (data-in) and SO (data-out) lines, requiring CS assertion and SCK synchronization for all operations. Its internal architecture includes a 128-byte page latch, status register with WIP/WEL/BP bits, and HV generator for EEPROM programming - enabling self-timed write/erase without external high-voltage supply.
It supports four erase modes - byte/page write (no pre-erase), page erase (5 ms typical), sector erase (10 ms typical), and chip erase (10 ms typical) - all controlled via dedicated opcodes (PE/SE/CE). Write protection is configurable via BP0/BP1 bits and enforced by both software (WRSR) and hardware (WP pin + WPEN bit).
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 lines and CS/SCK/HOLD/WP control |
| Max Clock Frequency | 20 MHz at VCC ≥ 4.5V; enables ≤50 ns minimum clock period for high-speed host MCU interfacing |
| Page Size & Write Time | 128-byte page; internal write cycle completes in ≤5 ms - allows burst writes without host polling overhead |
| Write Endurance | 1 million erase/write cycles per page - validated at 25°C, 5.5V; critical for frequent calibration updates |
| Data Retention | >200 years at 25°C - ensures long-term reliability in unpowered storage applications |
| Deep Power-Down Current | ≤2 µA at 2.5V, 125°C - enables ultra-low-power battery-backed systems |
Pinout & Package
25LC512-I/SN is packaged in 8-lead SOIC (SN), with 1.27 mm pitch, body size 3.9 mm × 4.9 mm, and RoHS-compliant matte tin lead finish. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable; forces SO into high-impedance when deasserted - enables multi-device SPI bus sharing |
| SO | Serial Data Output | Tri-state output; data valid after SCK falling edge - synchronized read timing avoids setup/hold violations |
| WP | Write-Protect Input | Hardware lock for STATUS register when WPEN=1; prevents accidental firmware corruption during power transitions |
| VSS | Ground Reference | Primary return path for all I/O and core logic - must be low-inductance connection to minimize noise coupling |
| SI | Serial Data Input | Latches data on SCK rising edge - compatible with standard SPI master timing without additional delay insertion |
| SCK | Serial Clock Input | Master-generated clock; defines all timing windows (Tsu, THD, TCSS, etc.) per AC specs Table 1-2 |
| HOLD | Hold Input | Pauses ongoing SPI transaction without reset; SO tri-states immediately - allows host MCU to service higher-priority interrupts |
| VCC | Supply Voltage | 2.5V–5.5V operation; supports mixed-voltage systems and brown-out tolerant designs |
Key Features
| Feature | Design Value |
|---|---|
| Page, Sector, and Chip Erase | Enables selective memory management: 5 ms page erase, 10 ms sector (16 KB), 10 ms full chip - avoids full-array rewrites during field updates |
| Hardware + Software Write Protection | WP pin + WPEN bit + BP0/BP1 bits allow layered protection: hardware lock for STATUS register, software-configurable sector locking |
| Deep Power-Down Mode | Reduces ICCSPD to ≤2 µA at 2.5V - extends battery life in always-on IoT sensors and metering devices |
| Electronic Signature (RDID) | 8-bit manufacturer ID (0x30) readable even from Deep Power-Down - enables automated BOM verification and counterfeit detection |
| AEC-Q100 Qualified | Qualified for automotive Grade 2 (–40°C to +105°C ambient) - validated for engine control modules and ADAS sensor nodes |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and firmware update flags in programmable logic controllers with no external backup power. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via SPI during boot and runtime; HOLD pin suspends reads during interrupt-driven analog sampling. Use Value: 1M endurance ensures >10 years of daily parameter updates; deep power-down mode (<2 µA) preserves settings during main power loss. |
Use Scenario: Recording factory-calibrated sensor offsets and patient-specific therapy settings in portable infusion pumps and ECG monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant data vault; WP pin grounded during production to prevent post-calibration writes until final validation. Use Value: Sector protection (BP0/BP1) isolates calibration sectors from user-modifiable therapy logs; >200-year retention meets FDA 510(k) archival requirements. |
| Automotive Body Control Module | Smart Energy Meter Firmware |
Use Scenario: Storing seat/mirror position presets, lighting profiles, and diagnostic trouble codes in 12V automotive BCMs operating across –40°C to +85°C. IC Role / Device Role / Timing Role: AEC-Q100 qualified EEPROM interfaced to PIC MCU via SPI; CE/SE commands enable over-the-air firmware patching without full reflash. Use Value: 20 MHz clock support enables fast code loading during ignition-on; 5.5V VCC tolerance handles load-dump transients up to 6.5V absolute max. |
Use Scenario: Holding metrology firmware, tariff tables, and cryptographic keys in ANSI C12.22-compliant smart meters with 10+ year field life. IC Role / Device Role / Timing Role: Trusted nonvolatile storage for secure boot and key provisioning; RDID command validates authenticity before key injection. Use Value: ESD rating >4 kV protects against handling damage during assembly; 128-byte page writes optimize OTA update packet size for narrowband PLC links. |
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; 3.3V only; no WP/HOLD pins | Higher density but slower write due to erase-before-write; lacks hardware write protection and deep power-down | Choose only if migrating to flash-based firmware storage with erase-aware firmware stack |
| 25AA512-I/SN | Pin-compatible 512 Kbit SPI EEPROM; identical SOIC-8 footprint and timing; same 2.5–5.5V range but lower max clock (10 MHz) | Same use cases but reduced throughput; suitable where host MCU SPI clock <10 MHz or cost sensitivity outweighs speed need | Select when 20 MHz timing margin is unnecessary and qualification reuse with 25AA512 simplifies design transfer |
Compared with AT25DF512C-SSH-T and 25AA512-I/SN, the 25LC512-I/SN uniquely combines 20 MHz SPI speed, hardware write protection, deep power-down, and EEPROM's byte-write convenience - making it optimal for real-time embedded systems requiring robust, low-power, and interrupt-tolerant nonvolatile storage.
Availability
25LC512-I/SN is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive electronics requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 25LC512-I/SN 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 25LC512-I/SN belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, SPI-based nonvolatile storage in resource-constrained embedded systems where byte-level writes and hardware security are essential.
FAQ
What is the maximum clock frequency supported by the 25LC512-I/SN?
The 25LC512-I/SN supports up to 20 MHz clock frequency when VCC is 4.5V–5.5V, and up to 10 MHz at 2.5V–4.5V. This is specified in Table 1-2 of the DS20002065D datasheet under FCLK parameter. The 20 MHz capability enables high-throughput communication with modern microcontrollers while maintaining strict setup/hold timing margins.
Does the 25LC512-I/SN require external erase before writing new data?
No, the 25LC512-I/SN does not require external erase before byte or page writes - it performs automatic self-timed erase during the internal write cycle. Erase operations (page/sector/chip) are optional and only needed for bulk reinitialization. This eliminates erase latency in typical configuration-update use cases and simplifies firmware design.
How does hardware write protection work on the 25LC512-I/SN?
Hardware write protection on the 25LC512-I/SN is enabled when 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 register bits (BP0/BP1/WPEN), preventing accidental configuration changes. The 25LC512-I/SN retains this protection across power cycles and supports independent software control via WRSR.
What is the purpose of the HOLD pin on the 25LC512-I/SN?
The HOLD pin on the 25LC512-I/SN pauses an ongoing SPI transaction without resetting the sequence - allowing the host MCU to service time-critical interrupts and resume communication from the exact point of suspension. Upon HOLD assertion, SO immediately enters high-impedance state, and communication resumes on HOLD deassertion while SCK is low, as defined in Section 2.6 of the datasheet.
Is the 25LC512-I/SN qualified for automotive applications?
Yes, the 25LC512-I/SN is AEC-Q100 qualified for automotive applications (Grade 2: –40°C to +105°C ambient). It meets stress testing requirements for temperature cycling, humidity bias, and ESD (>4 kV HBM), making it suitable for body control modules, infotainment systems, and ADAS sensor nodes where reliability under harsh conditions is mandatory.
25LC512-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25LC512-I/SN FAQ
1.How can I place an order for 25LC512-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC512-I/SN 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-I/SN reliable?
The price and inventory of 25LC512-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25LC512-I/SN is usually 5 days.
3.What payment methods are accepted for 25LC512-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC512-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC512-I/SN?
25LC512-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC512-I/SN 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-I/SN?
For technical support, including 25LC512-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC512-I/SN requirements.
6.How does Aetrix verify that 25LC512-I/SN is sourced from the original manufacturer or authorized distributors?
All 25LC512-I/SN 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-I/SN meets industry standards.
7.What is the process for return or replacement of 25LC512-I/SN?
All 25LC512-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 25LC512-I/SN, 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-I/SN part is unused and in its original packaging.
Return procedure for 25LC512-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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