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25AA640AT-I/MNY
Microchip Technology
IC EEPROM 64KBIT SPI 10MHZ 8TDFN
18793 Pcs New Original In Stock
EEPROM Memory IC 64Kbit SPI 10 MHz 8-TDFN (2x3)
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*Quantity
Minimum 1
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5.0 / 5.0
- (200 Ratings)
25AA640AT-I/MNY
Product Overview
1400055
DiGi Electronics Part Number
25AA640AT-I/MNY-DGManufacturer
Microchip Technology
25AA640AT-I/MNY
Description
IC EEPROM 64KBIT SPI 10MHZ 8TDFNInventory
18793 Pcs New Original In Stock
EEPROM Memory IC 64Kbit SPI 10 MHz 8-TDFN (2x3)
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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25AA640AT-I/MNY Technical Specifications
Category
Memory, Memory
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
DiGi-Electronics 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
Voltage - Supply
1.8V ~ 5.5V
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Package / Case
8-WFDFN Exposed Pad
Supplier Device Package
8-TDFN (2x3)
Base Product Number
25AA640
Datasheet & Documents
HTML Datasheet
25AA640AT-I/MNY-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.32.0051
Additional Information
Other Names
25AA640AT-I/MNYCT
25AA640AT-I/MNYDKR
25AA640AT-I/MNYTR
25AA640ATIMNY
Standard Package
3,300
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
매번 배송이 신속하고, 제품의 품질이 고급스럽고 안정적이어서 안심하고 구매합니다.
Dec 02, 2025
Je recommande vivement DiGi Electronics pour la qualité et le prix exceptionnels.
Dec 02, 2025
Their ability to ship quickly means I always have my tech needs addressed promptly, and their durable products last for years.
Dec 02, 2025
Their meticulous approach to packaging guarantees safe arrival.
Dec 02, 2025
Their large stock and attentive customer support make equipment upgrading hassle-free.
Dec 02, 2025
Fast and safe shipping has made DiGi Electronics my preferred supplier for electronic components.
Dec 02, 2025
Their logistics tracking platform is reliable and very convenient, making the whole process stress-free.
Dec 02, 2025
Their honest and transparent approach builds long-term trust.
Dec 02, 2025
DiGi Electronics' support team is knowledgeable and eager to assist.
Dec 02, 2025
Fast shipment coupled with excellent packaging means I can rely on them for urgent needs.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when integrating the 25AA640AT-I/MNY into a low-voltage embedded system powered at 1.8V, and how can they be mitigated?
When designing the 25AA640AT-I/MNY into a 1.8V system, a critical risk is the SPI master's output voltage levels marginally meeting the 25AA640AT-I/MNY's logic high input threshold (VIH = 0.7 × VCC = 1.26V at 1.8V). This narrow noise margin can cause clock or data corruption in electrically noisy environments. To mitigate, ensure clean power delivery with local 0.1µF bypass capacitors at the 25AA640AT-I/MNY's supply pin, use series resistors (e.g., 22–47Ω) on SPI lines to damp ringing, and verify signal integrity with an oscilloscope under real operating conditions. Additionally, confirm your microcontroller's VOH specification at 1.8V exceeds 1.26V with sufficient margin (ideally >1.4V).
How does the 25AA640AT-I/MNY compare to the ST M95640-WMN6TP in terms of write-cycle reliability and supply voltage flexibility?
The 25AA640AT-I/MNY and ST M95640-WMN6TP both offer 64Kbit SPI EEPROM functionality, but differ in write reliability and voltage range. The 25AA640AT-I/MNY supports a wider supply range (1.8V–5.5V) versus the M95640's 2.5V–5.5V, making the 25AA640AT-I/MNY suitable for battery-powered or 1.8V logic systems. Both specify 1 million write cycles, but Microchip's endurance characterization typically includes more extensive data retention validation across temperature extremes. However, the M95640 integrates a Status Register Lock feature absent in the 25AA640AT-I/MNY, which may be critical in write-protection-sensitive applications. For designs needing ultra-low voltage operation or drop-in replacement in 1.8V systems, the 25AA640AT-I/MNY is preferable, but assess specific write-protection needs before replacement.
Can the 25AA640AT-I/MNY reliably retain data when exposed to repeated thermal cycling between -40°C and 85°C in automotive-grade applications?
Yes, the 25AA640AT-I/MNY is specified for operation from -40°C to 85°C (TA) and retains data for up to 200 years at 85°C as per standard EEPROM wear-out models. However, repeated thermal cycling can accelerate intermetallic diffusion and lead to early failure if PCB layout induces mechanical stress. To ensure reliability in automotive environments, mount the 25AA640AT-I/MNY away from high-thermal-mass components, use a footprint with symmetric thermal pads to minimize warpage, and avoid rigid fixturing that constrains package expansion. Additionally, validate data integrity via periodic read-back during environmental testing, especially if the device is in a safety-critical logging function.
What are the implications of replacing a 24LC64-I/P with the 25AA640AT-I/MNY in an existing I2C-to-SPI migration, and how should the firmware be adjusted?
Replacing the I2C-based 24LC64-I/P with the SPI-only 25AA640AT-I/MNY requires both hardware and firmware changes. The 25AA640AT-I/MNY uses SPI Mode 0 (CPOL=0, CPHA=0) at up to 10MHz, versus the 24LC64's 400kHz I2C interface—this offers faster throughput but needs four MCU pins (SCK, SI, SO, CS) instead of two. Update firmware to use SPI driver routines with proper chip select management and insert 5ms delays after each page write (max 16 bytes). Confirm that your MCU supports GPIO-controlled CS to avoid spurious clocks corrupting the 25AA640AT-I/MNY. Also, note the 25AA640AT-I/MNY lacks internal address increment across pages, so handle boundary checks in software. Test write timing and bus contention in mixed-voltage systems where level shifters may be needed.
What layout and PCB design guidelines should be followed to ensure signal integrity when operating the 25AA640AT-I/MNY at 10MHz SPI in a compact 8-TDFN (2x3) package?
Operating the 25AA640AT-I/MNY at 10MHz SPI demands careful PCB layout due to the small 8-TDFN (2x3) footprint. Keep SPI traces as short and direct as possible—ideally under 1 inch—and avoid vias on SCK, SI, and SO lines to prevent impedance discontinuities. Route signals on a consistent layer with a solid ground plane beneath. Place a 0.1µF X7R capacitor within 2mm of the VCC pin, connected directly to the exposed pad (ground tie), which should be soldered and tied to ground for thermal and EMI control. Use controlled impedance routing if traces exceed 3 inches or run near RF sources. Simulate signal rise times: at 10MHz, fast edges (>5ns) may cause ringing, so consider 0Ω series resistors near the driver if overshoot exceeds 20% of VCC. Always validate with loopback or real-time write/read tests on prototype boards.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
25AA640AT-I/MNY CAD Models
Microchip Technology 25AA640AT-I/MNY PCB symbols & footprints
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