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24LCS21A/SN
Microchip Technology
IC EEPROM 1KBIT I2C 400KHZ 8SOIC
3270 Pcs New Original In Stock
EEPROM Memory IC 1Kbit I2C 400 kHz 900 ns 8-SOIC
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5.0 / 5.0
- (377 Ratings)
24LCS21A/SN
Product Overview
1406048
DiGi Electronics Part Number
24LCS21A/SN-DGManufacturer
Microchip Technology
24LCS21A/SN
Description
IC EEPROM 1KBIT I2C 400KHZ 8SOICInventory
3270 Pcs New Original In Stock
EEPROM Memory IC 1Kbit I2C 400 kHz 900 ns 8-SOIC
Quantity
Minimum 1
Minimum 1
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24LCS21A/SN Technical Specifications
Category
Memory, Memory
Packaging
Tube
Series
-
Product Status
Active
DiGi-Electronics Programmable
Verified
Memory Type
Non-Volatile
Memory Format
EEPROM
Technology
EEPROM
Memory Size
1Kbit
Memory Organization
128 x 8
Memory Interface
I2C
Clock Frequency
400 kHz
Write Cycle Time - Word, Page
10ms
Access Time
900 ns
Voltage - Supply
2.5V ~ 5.5V
Operating Temperature
0°C ~ 70°C (TA)
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Supplier Device Package
8-SOIC
Base Product Number
24LCS21A
Datasheet & Documents
HTML Datasheet
24LCS21A/SN-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
24LCS21A/SN-NDR
Standard Package
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)
Dec 02, 2025
我很喜歡他們的售後服務，無論是產品諮詢還是維修意見，他們都能耐心聆聽並提供專業建議。
Dec 02, 2025
The quality of support after purchase is outstanding—very professional and attentive.
Dec 02, 2025
DiGi Electronics staff members are genuinely friendly, making me feel welcomed every time.
Dec 02, 2025
Best place for budget-friendly products that are packaged sustainably.
Dec 02, 2025
The reliability of their products combined with responsive after-sales support is commendable.
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Frequently Asked Questions (FAQ)
What are the key reliability risks when using the 24LCS21A/SN EEPROM in industrial environments with temperature cycling beyond 70°C, and how can I mitigate them?
The 24LCS21A/SN is rated for an operating temperature range of 0°C to 70°C (TA), and exceeding this—especially in industrial applications with frequent thermal cycling—can accelerate data retention degradation and increase bit error rates due to oxide stress in the EEPROM cells. To mitigate risk, avoid direct placement near heat sources, implement thermal management (e.g., spacing, airflow), and consider derating the write frequency under elevated ambient conditions. For applications requiring extended temperature ranges, evaluate alternatives like the Microchip 24AA128-I/SN (industrial grade, –40°C to +85°C) instead of pushing the 24LCS21A/SN beyond its specified limits.
Can I replace a legacy 24LC01B/SN with the 24LCS21A/SN in an existing I2C design without firmware changes, and what hidden compatibility issues should I watch for?
While both the 24LC01B/SN and 24LCS21A/SN are 1Kbit I2C EEPROMs in 8-SOIC packages, direct replacement isn't always seamless. The 24LCS21A/SN supports only 400 kHz I2C clock speed (vs. 100 kHz on older 24LC01B variants), so ensure your master controller can operate at 400 kHz. More critically, the 24LCS21A/SN uses a fixed I2C address (1010xxx), whereas some 24LC01B versions allow address pin configuration—verify address conflicts on your bus. Additionally, the 24LCS21A/SN has a 10 ms write cycle time per page; if your firmware assumes faster writes, add proper delay or poll the ACK status to prevent data corruption.
How does the 24LCS21A/SN handle bus contention and power-up sequencing in multi-master I2C systems, and what design practices reduce communication failure risk?
The 24LCS21A/SN lacks built-in bus arbitration logic and is vulnerable to glitches during power-up if VCC ramps slowly or if other I2C devices drive the SDA/SCL lines before the EEPROM is fully powered. This can cause false start conditions or lockups. To reduce risk, implement a power-on reset (POR) circuit or ensure your microcontroller holds the I2C lines idle until VCC of the 24LCS21A/SN stabilizes above 2.5V. Use pull-up resistors sized for your bus capacitance (typically 2.2–10 kΩ) and avoid long trace lengths. In multi-master setups, add timeout handling in firmware and consider using a dedicated I2C buffer like the PCA9515A if bus integrity is critical.
Is the 24LCS21A/SN suitable for high-write-cycle applications like logging sensor data every few seconds, and what endurance limitations should I account for in my design?
The 24LCS21A/SN guarantees 1 million write/erase cycles per byte, which may seem sufficient, but frequent writes to the same memory location (e.g., a status flag or counter) can wear out that cell prematurely. For logging applications, implement wear leveling by rotating write addresses across the 128-byte array or use a circular buffer strategy. Avoid writing on every sensor read—buffer data in RAM and batch writes. If your application exceeds ~100 writes per minute long-term, consider migrating to FRAM (e.g., Fujitsu MB85RC16) or a larger EEPROM with better endurance characteristics, as the 24LCS21A/SN is optimized for configuration storage, not high-frequency data logging.
What are the layout and PCB design best practices for ensuring signal integrity with the 24LCS21A/SN in a noisy automotive or motor control environment?
In electrically noisy environments, the 24LCS21A/SN’s I2C interface is susceptible to EMI-induced communication errors due to its open-drain signaling. Keep SDA and SCL traces as short as possible, route them away from high-current paths or switching nodes (e.g., motor drivers), and use ground planes beneath the signal lines. Place a 0.1 µF ceramic decoupling capacitor within 5 mm of the VCC pin to suppress transient noise. Avoid daisy-chaining multiple I2C devices over long distances; instead, use star topology with local buffering. If noise persists, consider adding small series resistors (100–470 Ω) near the 24LCS21A/SN’s SDA/SCL pins to dampen ringing, but verify timing margins remain within I2C 400 kHz specs.
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24LCS21A/SN CAD Models
Microchip Technology 24LCS21A/SN PCB symbols & footprints
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