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Microchip Technology 25LC640AT-E/SN16KVAO
- Part No.:
- 25LC640AT-E/SN16KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25LC640AT-E/SN16KVAO.pdf
- Description:
- IC EEPROM 64KBIT SPI 10MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,947
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Product details
Overview
25LC640AT-E/SN16KVAO from Microchip Technology Inc. is a 64-Kbit SPI Serial EEPROM with 8192 × 8-bit organization, 32-byte page size, and 10 MHz max clock (at VCC ≥ 4.5V). It supports industrial temperature range (–40°C to +85°C), features hardware write protection via WP pin and STATUS register, and is used for nonvolatile parameter storage in microcontroller-based embedded systems.
For engineers reviewing the 25LC640AT-E/SN16KVAO datasheet, 25LC640AT-E/SN16KVAO pinout, 25LC640AT-E/SN16KVAO application, or 25LC640AT-E/SN16KVAO equivalent, key selection criteria include SPI timing compliance at 1.8–5.5V supply, block-level write protection granularity (none/¼/½/all), endurance (1M cycles), data retention (>200 years), and SOIC-8 packaging with lead-free RoHS compliance.
Technical Context
The 25LC640AT-E/SN16KVAO implements a standard SPI Mode 0,0/Multi-Master interface with separate SI (data-in) and SO (data-out) lines, CS-controlled selection, and HOLD pin for transaction suspension without reset. Its internal architecture includes an 8-bit instruction register, page latches, and high-voltage generator for EEPROM programming.
It uses self-timed internal write cycles (≤5 ms), supports sequential read with automatic address increment, and provides dual-layer write protection: volatile WEL latch control and nonvolatile BP0/BP1 bits in the STATUS register, configurable via WRSR instruction and enabled only when WPEN=1 and WP=low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 × 8-bit array), sufficient for firmware configuration tables or calibration data in resource-constrained MCUs. |
| Interface | SPI-compatible serial bus (Mode 0,0), requiring only CS, SCK, SI, SO - minimal GPIO usage on host controller. |
| Page Size | 32 bytes; write operations must not cross physical page boundaries (0x0000–0x001F, etc.) to avoid data wraparound. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5V; scales down to 5 MHz (2.5–4.5V) and 3 MHz (1.8–2.5V) - enables flexible power/performance tradeoffs. |
| Endurance & Retention | 1,000,000 erase/write cycles and >200 years data retention at +25°C - suitable for long-life industrial deployments. |
| Supply Voltage | 2.5V to 5.5V; compatible with both 3.3V and 5V logic systems without level-shifting. |
| Operating Temp | –40°C to +85°C (Industrial grade); validated across full range per AEC-Q100 stress testing protocols. |
Pinout & Package
25LC640AT-E/SN16KVAO is packaged in an 8-lead narrow SOIC (SN) package per Microchip drawing C04-057-SN Rev F, with 150-mil body width, gull-wing leads, and RoHS-compliant matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable; deselecting forces SO into high-impedance state for multi-device SPI bus sharing. |
| SO (Pin 2) | Serial Data Output | Outputs memory data on falling edge of SCK; tri-stated when CS high or HOLD low. |
| WP (Pin 3) | Write-Protect Pin | Hardware lock for STATUS register writes when WPEN=1; no effect on array writes unless configured in STATUS. |
| VSS (Pin 4) | Ground Reference | Primary return path for all internal circuitry and I/O drivers; must be low-impedance connection. |
| SI (Pin 5) | Serial Data Input | Latches instructions, addresses, and write data on rising edge of SCK; sampled after CS goes low. |
| SCK (Pin 6) | Serial Clock Input | Synchronizes all SPI transactions; rising edge clocks input data, falling edge updates output data. |
| HOLD (Pin 7) | Transaction Pause Control | Pulled low (with SCK low) suspends ongoing SPI sequence; resumes from same point when released. |
| VCC (Pin 8) | Power Supply | 2.5–5.5V supply; internal regulation ensures stable EEPROM programming voltage regardless of rail variation. |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Configurable via BP0/BP1 bits to protect none, upper 1/4 (0x1800–0x1FFF), upper 1/2 (0x1000–0x1FFF), or entire array - enables secure boot loader partitioning. |
| Power-On Data Protection | Write enable latch resets at power-up, and WP pin + WPEN bit prevent accidental writes during brown-out or reset sequences. |
| Hold Function | Allows host MCU to service higher-priority interrupts mid-transaction without losing SPI state - eliminates re-synchronization overhead. |
| Low Standby Current | 1 µA typical at 5.5V and +85°C - critical for battery-powered devices requiring years of shelf life. |
| ESD Robustness | 4 kV HBM rating on all pins - reduces need for external TVS diodes in noisy industrial environments. |
Applications
| Industrial Sensor Calibration Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and linearization tables in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed via SPI during system initialization and runtime correction routines. Use Value: Enables field-replaceable sensors without recalibration; leverages 1M-cycle endurance for periodic recalibration updates over 10+ years. | Use Scenario: Holding user-configurable therapy parameters (e.g., dosage limits, alarm thresholds) in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration storage with hardware write protection preventing unauthorized changes. Use Value: Meets IEC 62304 safety requirements via BP bits locking critical settings and WP pin disabling writes during operation. |
| Automotive Body Control Module NVM | Smart Energy Meter Firmware Settings |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock behavior in automotive BCMs. IC Role / Device Role / Timing Role: AEC-Q100 qualified EEPROM interfacing directly with PIC® MCU SPI peripheral for infrequent but reliable writes. Use Value: –40°C to +85°C operation ensures reliability under hood conditions; 5 ms write time allows quick save-on-exit without MCU timeout issues. | Use Scenario: Storing tariff schedules, meter ID, and communication credentials in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Long-term data retention element supporting 20+ year utility deployment lifecycles with periodic firmware updates. Use Value: >200-year data retention and 1 µA standby current minimize battery drain in AMI endpoint backup power systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA640AT-I/SN | Wider VCC range (1.8–5.5V); identical pinout, timing, and memory map. | Supports 1.8V logic systems (e.g., ultra-low-power IoT nodes) where 25LC640AT-E/SN16KVAO cannot operate. | Select when interfacing with sub-2.5V MCUs; otherwise, 25LC640AT-E/SN16KVAO offers better noise margin at 3.3V/5V rails. |
| AT25DF641A-SHN-T | 64 Mbit density, quad SPI interface, 8-pin SOIC package; no HOLD or WP pins; different command set. | Targeted at firmware code storage (XIP-capable), not parameter storage; requires driver rewrite and layout review. | Choose only if migrating to larger memory with faster read throughput; not a drop-in replacement due to interface and protection differences. |
Compared with 25AA640AT-I/SN, the 25LC640AT-E/SN16KVAO trades 1.8V compatibility for tighter VCC noise immunity above 2.5V; versus AT25DF641A-SHN-T, it provides deterministic 5 ms writes and hardware write protection essential for configuration integrity - not raw speed or density.
Availability
25LC640AT-E/SN16KVAO is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 25LC640AT-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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25LC640A family delivers cost-optimized, SPI-compatible EEPROMs targeting embedded systems needing reliable, low-power nonvolatile storage for configuration, calibration, and event logging - designed for seamless integration with PIC® and other SPI-capable MCUs.
FAQ
What is the maximum clock frequency supported by the 25LC640AT-E/SN16KVAO across its full voltage range?
The 25LC640AT-E/SN16KVAO supports up to 10 MHz at VCC ≥ 4.5V, 5 MHz at 2.5V ≤ VCC < 4.5V, and 3 MHz at 1.8V ≤ VCC < 2.5V. These values are specified in Table 1-2 of the DS20001830G datasheet and reflect guaranteed AC timing performance across temperature. The 25LC640AT-E/SN16KVAO does not operate below 2.5V, so the 1.8V–2.5V range applies only to the 25AA640A variant.
How does the write protection mechanism work on the 25LC640AT-E/SN16KVAO?
The 25LC640AT-E/SN16KVAO implements two-tier write protection: a volatile Write Enable Latch (WEL) set via WREN instruction, and nonvolatile Block Protection (BP0/BP1) bits in the STATUS register. Hardware protection activates only when WPEN=1 and WP pin is low - blocking STATUS register writes. Array protection is controlled solely by BP bits. The 25LC640AT-E/SN16KVAO requires explicit WREN before any write, and the latch resets after each successful WRITE or WRSR command.
Can the 25LC640AT-E/SN16KVAO be used in automotive applications?
Yes - the 25LC640AT-E/SN16KVAO is AEC-Q100 qualified for automotive use and rated for Industrial temperature range (–40°C to +85°C). Its robust ESD rating (4 kV HBM), low standby current (1 µA), and hardware write protection make it suitable for body control modules, infotainment configuration storage, and ADAS sensor calibration memory. Note that extended temperature (–40°C to +125°C) variants exist but require different part numbers.
What is the page size and write cycle time for the 25LC640AT-E/SN16KVAO?
The 25LC640AT-E/SN16KVAO has a fixed 32-byte page size and guarantees a maximum internal write cycle time of 5 ms (TWC), independent of voltage or temperature. Page writes must remain within a single 32-byte boundary (e.g., 0x0000–0x001F); crossing boundaries causes data to wrap within the page. This 5 ms timing is critical for MCU firmware to implement proper polling or interrupt-driven completion detection - a key design consideration for the 25LC640AT-E/SN16KVAO.
Is the 25LC640AT-E/SN16KVAO pin-compatible with other Microchip 64-Kbit SPI EEPROMs?
Yes - the 25LC640AT-E/SN16KVAO shares identical pinout, package (SOIC-8 SN), and electrical characteristics with all members of the 25XX640A family, including 25AA640A and 25LC640A in SOIC-8. This allows direct substitution within the same temperature and voltage grade. However, 25AA640A supports 1.8V operation while 25LC640AT-E/SN16KVAO does not; mixing variants without verifying VCC compatibility may cause functional failure.
25LC640AT-E/SN16KVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K 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
25LC640AT-E/SN16KVAO FAQ
1.How can I place an order for 25LC640AT-E/SN16KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC640AT-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 25LC640AT-E/SN16KVAO reliable?
The price and inventory of 25LC640AT-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 25LC640AT-E/SN16KVAO is usually 5 days.
3.What payment methods are accepted for 25LC640AT-E/SN16KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC640AT-E/SN16KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC640AT-E/SN16KVAO?
25LC640AT-E/SN16KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC640AT-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 25LC640AT-E/SN16KVAO?
For technical support, including 25LC640AT-E/SN16KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC640AT-E/SN16KVAO requirements.
6.How does Aetrix verify that 25LC640AT-E/SN16KVAO is sourced from the original manufacturer or authorized distributors?
All 25LC640AT-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 25LC640AT-E/SN16KVAO meets industry standards.
7.What is the process for return or replacement of 25LC640AT-E/SN16KVAO?
All 25LC640AT-E/SN16KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 25LC640AT-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 25LC640AT-E/SN16KVAO part is unused and in its original packaging.
Return procedure for 25LC640AT-E/SN16KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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