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Microchip Technology 25LC256-E/SM16KVAO
- Part No.:
- 25LC256-E/SM16KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
25LC256-E/SM16KVAO.pdf
- Description:
- IC EEPROM 256KBIT SPI 5MHZ 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,779
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Product details
Overview
25LC256-E/SM16KVAO from Microchip Technology Inc. is a 256 Kbit SPI Serial EEPROM with 32,768 × 8-bit organization, 64-byte page size, and industrial temperature range (–40°C to +85°C). It operates from 2.5V to 5.5V, supports up to 10 MHz clock frequency, and delivers 5 mA max write current at 5.5V - used for nonvolatile configuration storage in embedded control systems.
For engineers reviewing the 25LC256-E/SM16KVAO datasheet, 25LC256-E/SM16KVAO pinout, 25LC256-E/SM16KVAO application, or 25LC256-E/SM16KVAO equivalent, key selection criteria include SPI interface compatibility, hardware write protection via WP pin, block-level array protection (BP0/BP1), and AEC-Q100 qualification for automotive subsystems.
Technical Context
The 25LC256-E/SM16KVAO implements a standard SPI Mode 0,0/Master-Slave interface with separate SI (data in) and SO (data out) lines, requiring CS, SCK, and HOLD for full protocol support. Its internal architecture includes a write-enable latch, STATUS register with WIP/WEL/BP bits, and high-voltage generator for EEPROM cell programming.
It features self-timed internal write cycles (≤5 ms), sequential read capability with automatic address rollover, and hardware-based data protection including power-on reset of WEL, WPEN-controlled pin write-protect, and ESD immunity >4 kV. The device supports four block protection configurations via BP0/BP1 bits and requires explicit WREN before any WRITE or WRSR command.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8-bit) - provides sufficient space for firmware parameters, calibration data, or device identity storage in resource-constrained systems. |
| Interface | SPI-compatible serial bus (Mode 0,0) - enables direct connection to MCU SPI peripherals without level-shifting or protocol translation. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5V - allows high-speed configuration reads during boot or runtime updates without bottlenecking host processor. |
| Page Size | 64 bytes - defines maximum contiguous write length per command; crossing page boundaries wraps data within same physical page. |
| Write Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in applications requiring frequent parameter logging or field-updatable settings. |
| Data Retention | >200 years at 25°C - guarantees persistent storage integrity across product lifetime without refresh mechanisms. |
| Supply Voltage | 2.5V to 5.5V - supports operation across legacy 5V and modern low-voltage 3.3V/2.5V embedded platforms. |
Pinout & Package
25LC256-E/SM16KVAO uses an 8-lead SOIC package (SN designation), measuring 3.90 mm × 4.90 mm × 1.25 mm (body height), with gull-wing leads and JEDEC-standard footprint. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable signal; must go high after final data bit to initiate internal write cycle; deselects device and places SO in high-impedance state. |
| SO | Serial Data Output | Tri-state output delivering memory contents on falling edge of SCK; high-impedance when CS is high or HOLD is asserted. |
| WP | Write-Protect Pin | Hardware lock for STATUS register writes when WPEN = 1; no effect on memory writes unless enabled via STATUS register. |
| VSS | Ground Reference | Primary return path for all internal circuitry and I/O drivers; must be connected to system ground plane for noise immunity. |
| SI | Serial Data Input | Accepts instructions, addresses, and data on rising edge of SCK; latched synchronously to clock for reliable command parsing. |
| SCK | Serial Clock Input | Master-generated clock synchronizing all SPI transactions; timing constraints require ≤100 ns rise/fall times for 10 MHz operation. |
| HOLD | Hold Input | Pauses ongoing SPI sequence without resetting state; must be asserted while SCK is low to avoid metastability; tri-states SO immediately. |
| VCC | Supply Voltage | Power input for core logic and EEPROM array; bypass capacitor (0.1 µF) required near pin to suppress switching noise during write cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Selectable protection of none, upper 1/4, upper 1/2, or entire memory array via BP0/BP1 bits - prevents accidental overwrites of critical calibration or security keys. |
| Hardware Write Protection | WP pin + WPEN bit enables physical lock on STATUS register writes - allows safe deployment in systems where firmware cannot modify protection settings. |
| Self-Timed Write Cycle | Internal 5 ms max write completion - eliminates need for host polling delay; WIP bit in STATUS register indicates busy state for precise timing control. |
| Low-Power Standby | 1 µA max ICCS at 5.5V and 125°C - minimizes quiescent current in battery-powered or always-on monitoring devices. |
| AEC-Q100 Qualification | Qualified for automotive applications (Grade 3: –40°C to +85°C) - validates reliability under thermal cycling, vibration, and voltage transients per automotive standards. |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and fault log history in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration EEPROM interfaced directly to ARM Cortex-M4 MCU via SPI. Use Value: Enables field reconfiguration without firmware update; 1M endurance supports daily parameter adjustments over 10+ years. |
Use Scenario: Retaining seat position presets, mirror angle offsets, and lighting profiles in vehicle body control units. IC Role / Device Role / Timing Role: SPI-connected memory holding user-customized settings across ignition cycles. Use Value: AEC-Q100 qualification ensures operation across automotive temperature extremes; hardware WP prevents corruption during ECU reset sequences. |
| Medical Diagnostic Equipment Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Saving sensor gain/offset coefficients and diagnostic test results in portable ultrasound or ECG devices. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage accessed during power-up initialization and periodic recalibration. Use Value: >200-year data retention guarantees accuracy traceability over equipment lifetime; block protection isolates calibration data from application code updates. |
Use Scenario: Holding tariff schedules, metering constants, and communication credentials in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: SPI EEPROM storing cryptographically signed configuration blocks updated via secure OTA channel. Use Value: 64-byte page writes align with AES-128 encrypted packet sizes; WP pin hardens against malicious overwrite attempts during firmware upgrade. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA256-I/SN | Wider VCC range (1.8V–5.5V); identical pinout, timing, and memory map - but lacks AEC-Q100 qualification. | Preferred for 1.8V/2.5V battery-powered IoT sensors where extended voltage headroom is needed. | Select 25AA256-I/SN only if supply voltage may drop below 2.5V; otherwise 25LC256-E/SM16KVAO offers superior automotive compliance. |
| AT25DF256A-SSH-T | Dual/quad SPI interface; 32 Mbit density; different command set and status register layout - not pin-compatible. | Suitable for high-throughput firmware storage where faster read speeds and larger capacity justify redesign. | Choose AT25DF256A-SSH-T only when migrating to dual/quad SPI architecture; requires PCB and firmware changes. |
Compared with 25AA256-I/SN, the 25LC256-E/SM16KVAO adds AEC-Q100 qualification and tighter VCC min (2.5V), making it safer for automotive use; versus AT25DF256A-SSH-T, it retains simple single-SPI compatibility and lower cost for basic configuration storage without capacity or speed demands.
Availability
25LC256-E/SM16KVAO is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical diagnostics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 25LC256-E/SM16KVAO 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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25LC256-E/SM16KVAO belongs to Microchip's 25XX256 family of SPI Serial EEPROMs, designed specifically for robust, low-power nonvolatile storage in automotive, industrial, and medical systems requiring guaranteed data integrity and long-term reliability.
FAQ
What is the operating voltage range for the 25LC256-E/SM16KVAO?
The 25LC256-E/SM16KVAO operates from 2.5V to 5.5V DC. This range supports compatibility with both legacy 5V logic systems and modern 3.3V embedded platforms. Operation below 2.5V is not guaranteed and may result in unreliable write cycles or STATUS register reads. The 25LC256-E/SM16KVAO datasheet specifies DC characteristics across this full range, including reduced max clock frequency at lower voltages.
Does the 25LC256-E/SM16KVAO support hardware write protection?
Yes, the 25LC256-E/SM16KVAO supports hardware write protection through the combination of the WP pin and the WPEN bit in the STATUS register. When WPEN = 1 and WP is pulled low, writes to the nonvolatile STATUS register bits (BP0, BP1, WPEN) are disabled. Memory array writes remain unaffected unless block protection is separately configured. This feature is confirmed in the 25LC256-E/SM16KVAO datasheet Section 2.6 and Table 2-1.
How many write/erase cycles does the 25LC256-E/SM16KVAO guarantee?
The 25LC256-E/SM16KVAO guarantees 1,000,000 erase/write cycles per memory location, as specified in DS20001822H-page 4, Table 1-3, Parameter 21. This endurance rating is validated at 25°C and VCC = 5.5V. Real-world endurance may vary with temperature and voltage; Microchip provides the Total Endurance™ Model for application-specific estimation.
Is the 25LC256-E/SM16KVAO pin-compatible with other 25XX256 variants?
Yes, the 25LC256-E/SM16KVAO shares identical pinout and package (8-lead SOIC, SN) with all members of the 25XX256 family, including 25AA256 and 25LC256 variants in P, SN, SM, ST, and MF packages. Pin functions (CS, SO, WP, VSS, SI, SCK, HOLD, VCC) and electrical timing are fully compatible per the shared datasheet DS20001822H.
What is the maximum SPI clock frequency supported by the 25LC256-E/SM16KVAO?
The 25LC256-E/SM16KVAO supports up to 10 MHz SPI clock frequency when VCC is 4.5V–5.5V, 5 MHz at 2.5V–4.5V, and 3 MHz at 1.8V–2.5V. These values are explicitly defined in Table 1-2, Parameter 1 (FCLK) of the official datasheet. Exceeding the rated frequency for a given VCC violates AC timing specifications and risks data corruption.
25LC256-E/SM16KVAO 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:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 5 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-SOIJ
25LC256-E/SM16KVAO FAQ
1.How can I place an order for 25LC256-E/SM16KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC256-E/SM16KVAO 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 25LC256-E/SM16KVAO reliable?
The price and inventory of 25LC256-E/SM16KVAO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25LC256-E/SM16KVAO is usually 5 days.
3.What payment methods are accepted for 25LC256-E/SM16KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC256-E/SM16KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC256-E/SM16KVAO?
25LC256-E/SM16KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC256-E/SM16KVAO 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 25LC256-E/SM16KVAO?
For technical support, including 25LC256-E/SM16KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC256-E/SM16KVAO requirements.
6.How does Aetrix verify that 25LC256-E/SM16KVAO is sourced from the original manufacturer or authorized distributors?
All 25LC256-E/SM16KVAO 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 25LC256-E/SM16KVAO meets industry standards.
7.What is the process for return or replacement of 25LC256-E/SM16KVAO?
All 25LC256-E/SM16KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 25LC256-E/SM16KVAO, 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 25LC256-E/SM16KVAO part is unused and in its original packaging.
Return procedure for 25LC256-E/SM16KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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