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Microchip Technology 25AA640AT-I/MS16KVAO
- Part No.:
- 25AA640AT-I/MS16KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
25AA640AT-I/MS16KVAO.pdf
- Description:
- IC EEPROM 64KBIT SPI 10MHZ 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,926
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Product details
Overview
25AA640AT-I/MS16KVAO from Microchip Technology Inc. is a 64-Kbit SPI Serial EEPROM with 8192 × 8-bit organization, 32-byte page size, and 1.8V–5.5V supply range. It supports up to 10 MHz clock frequency at 4.5–5.5V, delivers 1 µA standby current at +85°C, and features hardware write protection via WP pin and STATUS register control. It is used in industrial sensor calibration storage and microcontroller firmware parameter retention.
For engineers reviewing the 25AA640AT-I/MS16KVAO datasheet, 25AA640AT-I/MS16KVAO pinout, 25AA640AT-I/MS16KVAO application, or 25AA640AT-I/MS16KVAO equivalent, this page provides verified electrical specs, SPI timing constraints, block protection configuration, endurance/reliability data, and validated alternative parts for design-in and BOM optimization.
Technical Context
The 25AA640AT-I/MS16KVAO implements a standard SPI Mode 0,0 (CPOL=0, CPHA=0) interface with separate SI/SO lines and dedicated CS, SCK, WP, HOLD pins. It uses internal high-voltage generation for EEPROM programming and includes an 8-bit instruction register supporting READ, WRITE, WREN, WRDI, RDSR, and WRSR commands.
Its memory array is partitioned into four 16-Kbit blocks, enabling selective write protection via BP0/BP1 bits in the STATUS register. The device supports sequential read, page write (max 32 bytes within same 32-byte boundary), and self-timed internal write cycles completing in ≤5 ms - all while maintaining compatibility with PIC® and other SPI-capable microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 × 8-bit), sufficient for storing bootloader config, calibration coefficients, or device identity data in space-constrained embedded systems. |
| Interface | SPI-compatible serial bus (Mode 0,0), requiring only CS, SCK, SI, SO - no I²C pull-ups or address decoding logic needed. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5V; enables fast parameter loading during system boot or field updates without CPU bottleneck. |
| Page Size | 32 bytes; defines maximum contiguous write length per CS assertion - critical for avoiding unintended wraparound during firmware patching. |
| Write Endurance | 1,000,000 erase/write cycles; supports daily recalibration logging over 27+ years at 100 cycles/day. |
| Data Retention | >200 years at +85°C; ensures long-term reliability of stored calibration or security keys in industrial deployments. |
| Supply Voltage | 1.8V–5.5V operation; interoperable with both 3.3V and 5V microcontrollers, eliminating level-shifter requirements. |
| Temperature Range | Industrial grade (–40°C to +85°C); qualified for use in motor drives, PLC modules, and outdoor IoT gateways. |
Pinout & Package
25AA640AT-I/MS16KVAO is packaged in an 8-lead MSOP (150 mil body, 3.0 mm × 4.9 mm), with exposed pad optionally connected to VSS for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable; must be held low for entire SPI transaction; rising edge initiates internal write cycle after valid command sequence. |
| SO (Pin 2) | Serial Data Output | Tri-state output; data shifted out on falling edge of SCK; enters high-Z when CS is high or HOLD is asserted. |
| WP (Pin 3) | Write-Protect Control | Hardware lock: disables STATUS register writes when WP=low and WPEN=1; prevents accidental corruption of protection settings. |
| VSS (Pin 4) | Ground Reference | Primary return path for all internal circuitry; exposed pad (if used) must connect to same ground plane for EMI and thermal stability. |
| SI (Pin 5) | Serial Data Input | Accepts instructions, addresses, and data; sampled on rising edge of SCK; requires setup/hold timing compliance per Table 1-2. |
| SCK (Pin 6) | Serial Clock Input | Synchronizes all SPI transfers; max 10 MHz at 5.5V; rise/fall times ≤100 ns required to meet AC timing margins. |
| HOLD (Pin 7) | Communication Pause | Halts ongoing SPI sequence without reset; must be driven low while SCK is low; resumes on rising edge of HOLD with SCK low. |
| VCC (Pin 8) | Power Supply | 1.8V–5.5V tolerant; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for stable read/write operation. |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Selective locking of 0%, 25%, 50%, or 100% of memory array via BP0/BP1 bits - enables secure partitioning of user data vs. factory calibration zones. |
| Power-On Write Disable | Automatic WEL reset at power-up prevents spurious writes during brown-out or cold-start conditions - eliminates need for external POR circuitry. |
| HOLD Functionality | Enables host MCU to service higher-priority interrupts mid-transaction without losing SPI state - reduces firmware complexity in real-time systems. |
| Low Standby Current | 1 µA at +85°C and 5.5V allows battery-powered devices (e.g., wireless sensors) to retain memory state for >10 years on a single coin cell. |
| RoHS & AEC-Q100 Qualified | Complies with automotive-grade reliability standards (AEC-Q100 Grade 2), making it suitable for under-hood telematics and ADAS subsystems. |
| ESD Robustness | 4 kV HBM rating on all pins - withstands handling and board-level ESD events without latch-up or parametric shift. |
Applications
| Industrial Sensor Calibration Storage | Microcontroller Firmware Parameter Retention |
|---|---|
|
Use Scenario: Storing temperature-compensated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during system initialization; read once per power cycle via SPI burst read. Use Value: Eliminates factory recalibration labor; enables field-updatable calibration tables without firmware reflash. |
Use Scenario: Holding runtime-modifiable parameters (e.g., PID gains, network credentials, display brightness) across MCU resets in smart HVAC controllers. IC Role / Device Role / Timing Role: Low-latency SPI slave providing byte-addressable read/write access during active system operation. Use Value: Enables user customization without requiring full firmware update; supports over-the-air parameter sync with cloud backend. |
| Automotive Body Control Module Settings | Medical Device Configuration Backup |
|
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock behavior in automotive BCMs compliant with AEC-Q100. IC Role / Device Role / Timing Role: AEC-Q100 qualified EEPROM interfacing directly with 3.3V CAN microcontroller SPI port. Use Value: Ensures reliable retention of user preferences over 15+ year vehicle lifetime; immune to vibration-induced bit flips. |
Use Scenario: Backing up device-specific calibration constants and regulatory-compliant usage logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory with hardware write protection enabled for audit-trail integrity. Use Value: Meets IEC 62304 software lifecycle requirements for Class B medical devices; supports FDA audit traceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC640AT-I/MS | Requires minimum 2.5V VCC; identical pinout, timing, and feature set otherwise. | Not suitable for 1.8V systems; otherwise drop-in replacement in 3.3V/5V designs with same temperature grade. | Select when operating voltage is guaranteed ≥2.5V and cost sensitivity favors legacy 25LC variant. |
| AT25DF641A-MAU-T | Quad SPI interface (x4 data lines), 80 MHz max clock, 64 Mbit density; different command set and package (8-MSOP). | Higher bandwidth and density for firmware storage; not pin- or software-compatible - requires driver rewrite and layout change. | Choose only when migrating to faster code execution or larger configuration space; not a direct substitute. |
Compared with 25AA640AT-I/MS16KVAO, the 25LC640AT-I/MS offers identical functionality at higher minimum voltage, while AT25DF641A-MAU-T trades software compatibility for speed and density - making the former a true functional alternative and the latter a platform upgrade path.
Availability
25AA640AT-I/MS16KVAO is available at Aetrix Electronics and suitable for industrial sensor calibration storage, microcontroller firmware parameter retention, automotive body control module settings, and medical device configuration backup requiring stable component supply and long-term obsolescence management.
Supply support for 25AA640AT-I/MS16KVAO 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, mixed-signal, analog, and Flash-IP solutions, serving industrial, automotive, consumer, and communications markets since 1989.
The 25AA640A family was designed specifically for robust, low-power serial data storage in resource-constrained embedded systems where SPI interface simplicity, wide voltage operation, and AEC-Q100 qualification are essential.
FAQ
What is the maximum clock frequency supported by the 25AA640AT-I/MS16KVAO?
The 25AA640AT-I/MS16KVAO supports up to 10 MHz clock frequency when VCC is between 4.5V and 5.5V. At 2.5V ≤ VCC < 4.5V, the maximum is 5 MHz, and at 1.8V ≤ VCC < 2.5V, it drops to 3 MHz. These limits ensure reliable setup/hold timing compliance across voltage and temperature ranges specified in Table 1-2 of the DS20001830G datasheet. The 25AA640AT-I/MS16KVAO maintains full functionality across all three speed grades without derating.
Does the 25AA640AT-I/MS16KVAO support hardware write protection?
Yes, the 25AA640AT-I/MS16KVAO supports hardware write protection through the combination of the WP pin and the WPEN bit in the STATUS register. When WP is low and WPEN = 1, writes to nonvolatile STATUS register bits are disabled - protecting block protection settings from accidental overwrite. This dual-control mechanism is explicitly defined in Table 5-1 and Section 2.3 of the DS20001830G datasheet. The 25AA640AT-I/MS16KVAO retains this capability across its full industrial temperature range.
How many write/erase cycles can the 25AA640AT-I/MS16KVAO endure?
The 25AA640AT-I/MS16KVAO guarantees 1,000,000 erase/write cycles at +25°C and VCC = 5.5V, as confirmed in Table 1-2 (Param. No. 21) of DS20001830G. Endurance is characterized across the full industrial temperature range (–40°C to +85°C) and remains valid for page-write operations aligned to 32-byte boundaries. The 25AA640AT-I/MS16KVAO achieves this via on-chip high-voltage generation and optimized tunnel oxide stress management.
What package type is used for the 25AA640AT-I/MS16KVAO?
The 25AA640AT-I/MS16KVAO uses an 8-lead MSOP package (150 mil body width, 3.0 mm × 4.9 mm footprint), designated as "MS" in Microchip's device selection table. This matches the "MS" suffix in the part number and is confirmed in Package Types section (page 1) and Package Marking Information (page 14) of DS20001830G. The 25AA640AT-I/MS16KVAO's MSOP variant includes an exposed pad that may be connected to VSS for improved thermal performance.
Can the 25AA640AT-I/MS16KVAO operate from a 1.8V supply?
Yes, the 25AA640AT-I/MS16KVAO is fully specified for 1.8V–5.5V operation, unlike the 25LC640A which requires minimum 2.5V. At 1.8V, it supports up to 3 MHz clock frequency and maintains full read/write functionality, including STATUS register access and block protection control. This 1.8V capability is explicitly listed in the Device Selection Table (page 1) and DC Characteristics (Table 1-1) of DS20001830G. The 25AA640AT-I/MS16KVAO is therefore the preferred choice for ultra-low-power or mixed-voltage systems.
25AA640AT-I/MS16KVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
25AA640AT-I/MS16KVAO FAQ
1.How can I place an order for 25AA640AT-I/MS16KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA640AT-I/MS16KVAO 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 25AA640AT-I/MS16KVAO reliable?
The price and inventory of 25AA640AT-I/MS16KVAO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25AA640AT-I/MS16KVAO is usually 5 days.
3.What payment methods are accepted for 25AA640AT-I/MS16KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA640AT-I/MS16KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA640AT-I/MS16KVAO?
25AA640AT-I/MS16KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA640AT-I/MS16KVAO 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 25AA640AT-I/MS16KVAO?
For technical support, including 25AA640AT-I/MS16KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA640AT-I/MS16KVAO requirements.
6.How does Aetrix verify that 25AA640AT-I/MS16KVAO is sourced from the original manufacturer or authorized distributors?
All 25AA640AT-I/MS16KVAO 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 25AA640AT-I/MS16KVAO meets industry standards.
7.What is the process for return or replacement of 25AA640AT-I/MS16KVAO?
All 25AA640AT-I/MS16KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 25AA640AT-I/MS16KVAO, 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 25AA640AT-I/MS16KVAO part is unused and in its original packaging.
Return procedure for 25AA640AT-I/MS16KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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