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24LC64T-I/SM
Microchip Technology
IC EEPROM 64KBIT I2C 8SOIJ
2697 Pcs New Original In Stock
EEPROM Memory IC 64Kbit I2C 400 kHz 900 ns 8-SOIJ
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5.0 / 5.0
- (186 Ratings)
24LC64T-I/SM
Product Overview
1236410
DiGi Electronics Part Number
24LC64T-I/SM-DGManufacturer
Microchip Technology
24LC64T-I/SM
Description
IC EEPROM 64KBIT I2C 8SOIJInventory
2697 Pcs New Original In Stock
EEPROM Memory IC 64Kbit I2C 400 kHz 900 ns 8-SOIJ
Quantity
Minimum 1
Minimum 1
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24LC64T-I/SM Technical Specifications
Category
Memory, Memory
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
DiGi-Electronics Programmable
Verified
Memory Type
Non-Volatile
Memory Format
EEPROM
Technology
EEPROM
Memory Size
64Kbit
Memory Organization
8K x 8
Memory Interface
I2C
Clock Frequency
400 kHz
Write Cycle Time - Word, Page
5ms
Access Time
900 ns
Voltage - Supply
2.5V ~ 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-SOIJ
Base Product Number
24LC64
Datasheet & Documents
HTML Datasheet
24LC64T-I/SM-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.32.0051
Additional Information
Other Names
24LC64T-I/SM-NDR
24LC64T-I/SMCT
24LC64T-I/SMDKR
24LC64T-I/SMTR
24LC64T-I/SM-DG
Standard Package
2,100
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
価格が安くて、スタッフの対応も素晴らしいです。
de desembre 02, 2025
The cost-effectiveness of their products is outstanding, especially given their durability.
de desembre 02, 2025
Outstanding after-sales service that prioritizes customer satisfaction above all.
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Frequently Asked Questions (FAQ)
What are the key design risks when replacing a 24LC64T-I/SM in an existing I2C system that uses 100 kHz clock speed, and how can I ensure compatibility without firmware changes?
The 24LC64T-I/SM supports I2C clock frequencies up to 400 kHz and is backward compatible with 100 kHz systems, so direct replacement is electrically feasible. However, a critical risk lies in bus capacitance and pull-up resistor selection—higher capacitance on long traces can cause signal integrity issues at 400 kHz, but may go unnoticed at 100 kHz. If your system was originally designed for a slower EEPROM like the 24C02, verify that pull-up resistors (typically 4.7kΩ) are appropriately sized for the actual bus capacitance. Also, confirm that the 24LC64T-I/SM’s 5ms write cycle time doesn’t violate timing assumptions in your firmware during page writes. Use an oscilloscope to validate SDA/SCL rise times and consider adding a small delay after write operations to avoid bus contention.
Can the 24LC64T-I/SM be used as a drop-in replacement for the STMicroelectronics M24C64-F in a 3.3V automotive application, and what reliability concerns should I evaluate?
Yes, the 24LC64T-I/SM is a functional replacement for the M24C64-F in most 3.3V applications due to overlapping voltage ranges (2.5V–5.5V vs. 1.8V–5.5V) and identical 8K x 8 organization. However, key differences exist: the 24LC64T-I/SM has a higher minimum operating voltage (2.5V vs. 1.8V), which may cause issues in low-power or brownout conditions near 2.5V. Additionally, while both are AEC-Q100 qualified variants available, ensure you're using the industrial-grade 24LC64T-I/SM (not automotive-specific) if your design requires full automotive certification. Evaluate long-term data retention under temperature cycling—Microchip specifies 200 years at 25°C, but derating above 85°C may differ from ST’s characterization. Always validate in-system endurance under worst-case thermal conditions.
How does the 24LC64T-I/SM’s page write behavior impact system reliability in battery-powered devices, and what firmware safeguards are recommended?
The 24LC64T-I/SM allows 64-byte page writes with a 5ms maximum write cycle time, but unlike some FRAM alternatives, it blocks I2C access during this period. In battery-powered systems, a sudden power loss during a page write can corrupt not only the target page but adjacent bytes due to internal charge pump activity. To mitigate this, implement a write-verify-retry routine and avoid writing critical configuration data in a single page. Use a supercapacitor or backup power source to ensure completion of ongoing writes during brownouts. Additionally, consider splitting large data updates across multiple smaller writes with checksums, and never assume atomicity—always design for partial-write recovery scenarios.
What layout and PCB design constraints must be followed when placing the 24LC64T-I/SM in a high-noise industrial environment to prevent data corruption?
In high-noise environments, the 24LC64T-I/SM’s I2C interface is susceptible to glitches that can falsely trigger start/stop conditions or corrupt data. Keep SDA and SCL traces as short as possible, route them away from switching regulators or motor drivers, and use ground guards if necessary. Although the device lacks built-in Schmitt triggers on I2C pins (common in newer EEPROMs), adding external RC filters (e.g., 100Ω + 100pF) can suppress high-frequency noise. Ensure the VCC decoupling capacitor (0.1µF ceramic) is placed within 2mm of the package. Also, avoid daisy-chaining multiple EEPROMs on the same bus without proper address management—the 24LC64T-I/SM uses A0–A2 for addressing, but noise can cause unintended device selection. Validate signal integrity with an eye diagram if operating near 400 kHz.
Is it safe to parallel two 24LC64T-I/SM devices on the same I2C bus for redundancy, and what are the failure mode implications?
Paralleling two 24LC64T-I/SM devices on the same I2C bus is not recommended due to conflicting output drivers on SDA. Unlike SRAM or FRAM devices with tri-state outputs, EEPROMs like the 24LC64T-I/SM actively drive SDA low during ACK cycles, which can cause shoot-through currents if both devices attempt to ACK simultaneously—even with different addresses. This can lead to premature wear or latch-up under voltage mismatch conditions. For redundancy, use separate I2C buses or select a device with hardware write protection and mirror data in firmware. Alternatively, consider using a single larger EEPROM (e.g., 24LC128) with partitioned memory regions and CRC checks. If redundancy is non-negotiable, isolate each 24LC64T-I/SM with I2C multiplexers (e.g., PCA9548A) to prevent bus contention.
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24LC64T-I/SM CAD Models
Microchip Technology 24LC64T-I/SM PCB symbols & footprints
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