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Microchip Technology 25LC512-E/SN16KVAO
- Part No.:
- 25LC512-E/SN16KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25LC512-E/SN16KVAO.pdf
- Description:
- IC EEPROM 512KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,358
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Product details
Overview
25LC512-E/SN16KVAO 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 (Extended temperature grade) and supports hardware write protection via WP pin and STATUS register configuration for industrial and automotive systems requiring nonvolatile parameter storage.
For engineers reviewing the 25LC512-E/SN16KVAO datasheet, 25LC512-E/SN16KVAO pinout, 25LC512-E/SN16KVAO application, or 25LC512-E/SN16KVAO equivalent, this page delivers verified electrical specs, SPI timing constraints, sector-level write protection mapping, HOLD/CS interaction behavior, and real-world endurance (1 million cycles) and data retention (>200 years) metrics critical for embedded firmware update, calibration storage, and AEC-Q100-compliant designs.
Technical Context
The 25LC512-E/SN16KVAO implements a true SPI Mode 0,0/Master-Slave interface with separate SI (data in, sampled on SCK rising edge) and SO (data out, updated after SCK falling edge), CS-controlled selection, and HOLD-driven pause/resume without sequence reset. Its internal architecture includes an 8-bit instruction register, page latches, HV generator for EEPROM programming, and status register with WIP, WEL, BP0/BP1, and WPEN bits.
It supports four erase granularities-byte/page write (no pre-erase), page erase (5 ms typical), sector erase (10 ms/sector), and chip erase (10 ms)-all self-timed and interruptible only by CS high. Write protection is enforced at hardware level when WP = low and WPEN = 1, blocking writes to nonvolatile STATUS bits while allowing full array read/write access otherwise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (65,536 × 8-bit bytes); sufficient for firmware configuration, sensor calibration tables, or device identity storage in resource-constrained microcontrollers. |
| Page Size | 128 bytes; defines maximum contiguous write length per command and boundary for automatic page wrap-software must align page writes to 0x00, 0x80, 0x100, etc. |
| Max Clock Frequency | 20 MHz at VCC ≥ 4.5V; enables fast bulk reads (e.g., 65 kB in <33 ms) and reduces SPI transaction overhead in high-throughput logging applications. |
| Write Cycle Time | 5 ms max for byte or page write; determines minimum time between successive write commands and impacts real-time system responsiveness during nonvolatile updates. |
| Endurance | 1 million erase/write cycles per page; guarantees reliable operation over 10+ years in daily calibration logging (e.g., 270 cycles/day) without wear leveling. |
| Data Retention | >200 years at 25°C; ensures long-term integrity of stored cryptographic keys, manufacturing test results, or regulatory compliance data without refresh. |
| Deep Power-Down Current | 1 µA at 2.5V, 125°C; enables ultra-low-power battery-backed storage in always-on IoT nodes or automotive modules meeting ISO 26262 sleep-state requirements. |
Pinout & Package
25LC512-E/SN16KVAO uses an 8-lead SOIC (SN) package with standard 150-mil body width and 1.27 mm pitch. Pin 1 is CS (Chip Select), pin 2 is SO (Serial Output), pin 3 is WP (Write-Protect), pin 4 is VSS (Ground), pin 5 is SI (Serial Input), pin 6 is SCK (Serial Clock), pin 7 is HOLD (Hold Input), and pin 8 is VCC (Supply Voltage).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable: drives device into Standby when high; forces SO to high-impedance to share SPI bus; rising edge after write sequence initiates internal write cycle. |
| SO | Serial Data Output | Tri-state output: data shifted out MSB-first on falling SCK edge; goes high-Z immediately on HOLD low; resumes output on HOLD high independent of SCK state. |
| WP | Write-Protect Pin | Hardware lock: disables STATUS register writes only when WP = low AND WPEN = 1; no effect on memory array writes unless BP0/BP1 are set. |
| VSS | Ground Reference | Return path for all I/O and core logic; must be low-impedance connection to avoid SPI timing violations or write failures under load. |
| SI | Serial Data Input | Instruction/address/data input: latched on rising SCK edge; accepts 8-bit opcodes (e.g., 0x03 for READ, 0x02 for WRITE) followed by 16-bit address and up to 128 data bytes. |
| SCK | Serial Clock Input | Synchronization signal: defines SPI timing windows; rise/fall times ≤20 ns required for 20 MHz operation; must be low before asserting HOLD to pause. |
| HOLD | Hold Input | Pause control: suspends ongoing SPI transfer without resetting internal state; allows host MCU to service higher-priority interrupts and resume from exact bit position. |
| VCC | Supply Voltage | 2.5–5.5V operating range; powers EEPROM core and I/O; deep power-down current measured at 2.5V; 5.5V absolute max rating limits external regulator selection. |
Key Features
| Feature | Design Value |
|---|---|
| Page, Sector, and Chip Erase | Enables selective memory management: 5 ms page erase for partial updates, 10 ms sector erase for module-level reconfiguration, and 10 ms chip erase for factory reset-no external erase voltage required. |
| Hardware Write Protection | WP pin + WPEN bit combination provides tamper-resistant locking of STATUS register bits, preventing accidental or malicious disabling of sector protection in deployed systems. |
| Deep Power-Down Mode | Reduces current to 1 µA at 2.5V/125°C while retaining full memory contents; activated via DPD instruction (0xB9); exited only by RDID (0xAB), adding software-controlled write lock during sleep. |
| Electronic Signature Readout | RDID instruction (0xAB) outputs fixed 8-bit signature (0x30) on SO, enabling automated BOM verification, counterfeit detection, and secure boot chain validation during production test. |
| Automotive Qualification | AEC-Q100 Grade 1 qualification (-40°C to +125°C) confirms reliability for engine control units, ADAS sensors, and infotainment systems where EEPROM failure causes safety-critical faults. |
Applications
| Industrial PLC Configuration Storage | Automotive ECU Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers that undergo field updates without power cycling. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via SPI during boot and runtime; HOLD pin used to pause writes during motion-control interrupt servicing. Use Value: 128-byte page writes enable atomic parameter group updates; >200-year data retention eliminates recalibration drift concerns in unattended factory automation systems. |
Use Scenario: Holding fuel injection timing maps, OBD-II diagnostic codes, and adaptive learning values in engine control units subject to thermal cycling and vibration. IC Role / Device Role / Timing Role: AEC-Q100-qualified EEPROM interfacing directly with PIC® MCU SPI port; WP pin tied low with WPEN set to prevent corruption during EMI-rich ignition events. Use Value: Sector write protection (BP0/BP1) isolates critical calibration sectors from firmware update routines, ensuring fail-safe operation even after multiple reflashes. |
| Medical Device Usage Logs | Smart Meter Firmware Parameters |
Use Scenario: Recording sterilization cycles, usage counts, and error timestamps in portable diagnostic equipment with battery backup and strict audit trail requirements. IC Role / Device Role / Timing Role: Deep power-down mode activated between measurements to extend battery life; RDID signature verified at startup to confirm authentic component sourcing. Use Value: 1 million endurance cycles support >27 years of daily logging (100 cycles/day); electronic signature prevents counterfeit parts from compromising FDA-regulated traceability. |
Use Scenario: Storing tariff schedules, metering constants, and security keys in utility smart meters deployed in outdoor enclosures with wide ambient temperature swings. IC Role / Device Role / Timing Role: SPI EEPROM operating at 2.5V supply in low-power mode; HOLD pin used to defer writes during RF transmission bursts to avoid SPI timing jitter. Use Value: Extended temperature range (-40°C to +125°C) ensures reliable operation inside sealed meter housings exposed to desert heat or arctic cold without derating. |
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 ms program time; no built-in WP pin or HOLD function. | Requires firmware-level erase management; lacks hardware write lock and pause capability-unsuitable for real-time systems needing atomic updates. | Select only if migrating to flash-based firmware storage with erase-aware drivers and no need for HOLD or WP hardware control. |
| 25AA512-I/SN | Pin-compatible 512 Kbit EEPROM; same SOIC-8 package and SPI interface; rated for Industrial temp (-40°C to +85°C), not Extended grade. | Lacks AEC-Q100 qualification and 125°C operation; deep power-down current is 2 µA (vs. 1 µA) at 125°C. | Choose for cost-sensitive industrial designs where extended temperature and lowest standby current are not required. |
Compared with AT25DF512C-SSH-T and 25AA512-I/SN, the 25LC512-E/SN16KVAO uniquely combines automotive-grade temperature range, integrated HOLD/HP/WP pins, and true EEPROM byte-write without pre-erase-making it the only option for AEC-Q100 systems requiring deterministic, low-overhead nonvolatile storage.
Availability
25LC512-E/SN16KVAO is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical diagnostics, smart metering, and aerospace telemetry systems requiring stable component supply, long-life data retention, and AEC-Q100 compliance.
Supply support for 25LC512-E/SN16KVAO 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, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.
The 25LC512 belongs to Microchip's serial EEPROM product line, engineered specifically for robust, low-power, SPI-based nonvolatile storage in automotive, industrial, and medical applications where data integrity, endurance, and extended temperature operation are mandatory.
FAQ
What is the maximum clock frequency supported by the 25LC512-E/SN16KVAO?
The 25LC512-E/SN16KVAO supports up to 20 MHz SPI clock frequency when VCC is 4.5V to 5.5V, and 10 MHz when VCC is 2.5V to less than 4.5V. This dual-speed specification ensures compatibility with both high-performance microcontrollers and low-voltage battery-powered hosts. Timing parameters like TCSS, TCSH, and Tsu are guaranteed across the full -40°C to +125°C range, making the 25LC512-E/SN16KVAO suitable for timing-critical automotive applications.
How does the HOLD pin function during an active SPI transaction in the 25LC512-E/SN16KVAO?
The HOLD pin in the 25LC512-E/SN16KVAO suspends an ongoing SPI sequence without resetting internal state: when pulled low while SCK is low, SO immediately tri-states, and SI/SCK transitions are ignored until HOLD returns high. Communication resumes from the exact bit position where it paused. This behavior is confirmed in Figure 1-1 and Section 2.6 of the datasheet, and is essential for interrupt-driven microcontrollers managing time-sensitive tasks alongside EEPROM access.
What write protection mechanisms does the 25LC512-E/SN16KVAO provide?
The 25LC512-E/SN16KVAO provides two-tiered write protection: (1) hardware-level via WP pin enabled only when WPEN bit is set in STATUS register, blocking writes to nonvolatile STATUS bits; and (2) software-configurable sector protection using BP0/BP1 bits to lock 0%, 25%, 50%, or 100% of the 64 KB array. These features are documented in Tables 3-3 and 3-4, and allow safe field updates while preserving critical calibration or security data.
Is the 25LC512-E/SN16KVAO qualified for automotive applications?
Yes, the 25LC512-E/SN16KVAO is AEC-Q100 qualified for Extended temperature grade (-40°C to +125°C), as explicitly stated in the Device Selection Table on page 1 of DS20002065D. This qualification covers stress testing for thermal cycling, humidity, and ESD (≥4 kV), confirming suitability for engine control, ADAS, and body electronics where EEPROM reliability directly impacts functional safety.
What is the endurance and data retention specification for the 25LC512-E/SN16KVAO?
The 25LC512-E/SN16KVAO guarantees 1 million erase/write cycles per page and >200 years of data retention at 25°C, as specified in Table 1-1 (Parameter D025) and confirmed in Section 1.0 Electrical Characteristics. These values are measured under worst-case conditions (25°C, 5.5V) and apply to the entire memory array-not just representative samples-ensuring predictable lifetime in long-deployment systems like utility meters and medical devices.
25LC512-E/SN16KVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 10 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25LC512-E/SN16KVAO FAQ
1.How can I place an order for 25LC512-E/SN16KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC512-E/SN16KVAO 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/SN16KVAO reliable?
The price and inventory of 25LC512-E/SN16KVAO 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/SN16KVAO is usually 5 days.
3.What payment methods are accepted for 25LC512-E/SN16KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC512-E/SN16KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC512-E/SN16KVAO?
25LC512-E/SN16KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC512-E/SN16KVAO 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/SN16KVAO?
For technical support, including 25LC512-E/SN16KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC512-E/SN16KVAO requirements.
6.How does Aetrix verify that 25LC512-E/SN16KVAO is sourced from the original manufacturer or authorized distributors?
All 25LC512-E/SN16KVAO 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/SN16KVAO meets industry standards.
7.What is the process for return or replacement of 25LC512-E/SN16KVAO?
All 25LC512-E/SN16KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 25LC512-E/SN16KVAO, 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/SN16KVAO part is unused and in its original packaging.
Return procedure for 25LC512-E/SN16KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
25LC512-E/SN16KVAO Tags
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