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AT25256AW-10SU-1.8
Microchip Technology
IC EEPROM 256KBIT SPI 8SOIC
1196 Pcs New Original In Stock
EEPROM Memory IC 256Kbit SPI 20 MHz 8-SOIC
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5.0 / 5.0
- (63 Ratings)
AT25256AW-10SU-1.8
Product Overview
1262530
DiGi Electronics Part Number
AT25256AW-10SU-1.8-DGManufacturer
Microchip Technology
AT25256AW-10SU-1.8
Description
IC EEPROM 256KBIT SPI 8SOICInventory
1196 Pcs New Original In Stock
EEPROM Memory IC 256Kbit SPI 20 MHz 8-SOIC
Quantity
Minimum 1
Minimum 1
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AT25256AW-10SU-1.8 Technical Specifications
Category
Memory, Memory
Packaging
-
Series
-
Product Status
Obsolete
DiGi-Electronics 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
20 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-SOIC (0.209", 5.30mm Width)
Supplier Device Package
8-SOIC
Base Product Number
AT25256
Datasheet & Documents
HTML Datasheet
AT25256AW-10SU-1.8-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
AT25256AW-10SU1.8
Standard Package
94
Alternative Parts
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MANUFACTURER
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Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
配送までの時間が非常に短く、驚きました。丁寧な梱包と迅速な対応に感謝しています。
de desembre 02, 2025
トラブルへの対応が早く、信頼できる会社です。価格も魅力的で、今後も利用したいです。
de desembre 02, 2025
They use advanced logistics technology, which helps ensure fast and predictable delivery times.
de desembre 02, 2025
They provide reliable support that I can count on at all times.
de desembre 02, 2025
Including no delays, the delivery was prompt and the prices are budget-friendly. Perfect for my needs.
de desembre 02, 2025
I've been impressed by the durability and high standards of their products, surpassing expectations.
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Frequently Asked Questions (FAQ)
Can I safely replace the obsolete AT25256AW-10SU-1.8 with a modern equivalent in an existing 1.8V to 3.3V mixed-voltage design without firmware changes?
Yes, but only if you carefully match interface timing and voltage thresholds. The AT25256AW-10SU-1.8 operates from 1.8V to 5.5V and uses standard SPI mode 0,0 or 3,3. A drop-in replacement like the M95256-WMN6P (STMicroelectronics) supports 2.5V to 5.5V and maintains compatible SPI timing, but it is not guaranteed to operate reliably at 1.8V. For true 1.8V compatibility, consider the 25AA256-E/SM (Microchip), which is rated down to 1.8V and pin-compatible in 8-SOIC. However, verify that your host controller’s SPI clock edge alignment matches the new device’s setup/hold requirements—especially at 20 MHz—to avoid data corruption during high-speed reads or writes.
What are the risks of using the AT25256AW-10SU-1.8 in a high-vibration industrial environment, and how can I mitigate potential reliability issues?
The AT25256AW-10SU-1.8, packaged in 8-SOIC, is surface-mount only and susceptible to solder joint fatigue under prolonged vibration or thermal cycling. Since it's already obsolete, long-term supply risk compounds mechanical reliability concerns. To mitigate: use conformal coating to reduce stress on joints, implement underfill if the PCB is in a high-G environment, and ensure proper pad design with thermal relief. Additionally, add software-level wear-leveling and periodic data validation (e.g., CRC checks) to detect early memory degradation. Consider migrating to a more robust package like SOIJ or TSSOP if redesign is feasible, or switch to a newer, actively supported EEPROM with better mechanical ratings.
How does the write endurance of the AT25256AW-10SU-1.8 compare to modern alternatives, and what design practices should I follow to avoid premature failure in frequent-write applications?
The AT25256AW-10SU-1.8 guarantees 1 million write cycles per byte, which is standard for EEPROMs, but real-world endurance can degrade faster under marginal voltage or temperature conditions. In contrast, newer parts like the M95256-RMN6TP offer similar endurance but with improved write algorithms and better error handling. To maximize lifespan: implement wear-leveling across the 32K x 8 array, avoid writing the same address repeatedly, and ensure VCC remains within ±10% of nominal during writes. Also, respect the 5ms page write cycle time—do not issue new commands prematurely, as this can corrupt data or stress the charge pump internally.
Is it safe to operate the AT25256AW-10SU-1.8 at its maximum clock frequency of 20 MHz when powered at 1.8V, or should I derate the speed for signal integrity?
While the datasheet specifies 20 MHz operation across the full voltage range (1.8V to 5.5V), real-world signal integrity at 1.8V can limit reliable performance due to reduced noise margins and slower rise/fall times. At 1.8V, we recommend derating the SPI clock to ≤10 MHz, especially if trace lengths exceed 5 cm or if there are impedance discontinuities. Use series termination resistors (e.g., 22–33 Ω) near the host MCU to dampen reflections, and keep SPI lines away from high-speed digital traces. If your application requires full 20 MHz throughput, validate timing margins with an oscilloscope under worst-case temperature and voltage conditions—particularly at -40°C, where propagation delays increase.
What critical differences should I evaluate before substituting the AT25256AW-10SU-1.8 with the 25AA256T-E/SN in a legacy automotive-grade design?
The 25AA256T-E/SN is a strong candidate as a replacement for the AT25256AW-10SU-1.8 due to its identical 8-SOIC package, 1.8V operation, and SPI compatibility. However, key differences include: the 25AA256T-E/SN has a slightly faster write cycle (3ms vs. 5ms), which may require firmware timeout adjustments, and it lacks the same automotive qualification (AEC-Q100) unless explicitly specified. Verify that the substitute meets your required temperature range (-40°C to +125°C for Grade 1 automotive); the standard 25AA256T-E/SN is only rated to +85°C. Also, confirm that the HOLD pin behavior and deep power-down current match your system’s power management scheme to avoid unexpected quiescent current draw in sleep modes.
Quality Assurance (QC)
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AT25256AW-10SU-1.8 CAD Models
Microchip Technology AT25256AW-10SU-1.8 PCB symbols & footprints
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