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24LCS21A/P
Microchip Technology
IC EEPROM 1KBIT I2C 400KHZ 8DIP
3041 Pcs New Original In Stock
EEPROM Memory IC 1Kbit I2C 400 kHz 900 ns 8-PDIP
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5.0 / 5.0
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24LCS21A/P
Product Overview
1412464
DiGi Electronics Part Number
24LCS21A/P-DGManufacturer
Microchip Technology
24LCS21A/P
Description
IC EEPROM 1KBIT I2C 400KHZ 8DIPInventory
3041 Pcs New Original In Stock
EEPROM Memory IC 1Kbit I2C 400 kHz 900 ns 8-PDIP
Quantity
Minimum 1
Minimum 1
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24LCS21A/P 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
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Supplier Device Package
8-PDIP
Base Product Number
24LCS21A
Datasheet & Documents
HTML Datasheet
24LCS21A/P-DG
PCN Design/Specification
PdCu Bond Wire Update 21/Sep/2015
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/P-NDR
Standard Package
60
Alternative Parts
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MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
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Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Die günstigen Preise bei DiGi Electronics machen das Einkaufen für mich jedes Mal zu einem positiven Erlebnis.
Dec 02, 2025
The customer care from DiGi Electronics is genuinely caring and professional.
Dec 02, 2025
The layout adapts well to different devices, enhancing usability.
Dec 02, 2025
I was impressed with how quickly my order arrived. The affordability made it even better.
Dec 02, 2025
We always receive our shipments on time, thanks to DiGi Electronics’ efficient processes.
Dec 02, 2025
I trust DiGi Electronics to deliver high-quality components that meet the highest standards.
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Frequently Asked Questions (FAQ)
Can the 24LCS21A/P be used as a direct replacement for the 24LC21/P in an existing I2C EEPROM design, and are there any voltage or timing compatibility risks?
Yes, the 24LCS21A/P is a functionally compatible upgrade to the 24LC21/P with identical memory organization (128 x 8), I2C interface, and pinout. Key improvements include guaranteed 400 kHz clock support and tighter AC specifications, making it more reliable in noise-sensitive or higher-speed applications. However, verify that your system operates within the 2.5V to 5.5V supply range of the 24LCS21A/P. If your design runs below 2.5V (e.g., 1.8V), this device will not function—consider the 24AA series instead. No firmware changes are needed, but ensure I2C pull-up resistors are sized appropriately for 400 kHz operation (typically 1.8kΩ to 4.7kΩ depending on bus capacitance) to avoid signal integrity issues.
How does the 24LCS21A/P handle bus contention or I2C protocol errors during write cycles, and what design practices minimize data corruption risks?
The 24LCS21A/P follows standard I2C protocol handling—bus contention can occur if multiple masters attempt communication simultaneously, potentially corrupting write commands. During a write cycle (up to 10ms), the device acknowledges its address but won’t respond to new commands; if the host proceeds incorrectly, it may hang the bus. To mitigate risks: (1) implement proper I2C arbitration in multi-master systems, (2) poll the device after a write using ACK-only cycles to confirm completion before issuing new commands, and (3) use external watchdog timers or software timeouts to recover bus locks. Additionally, ensure stable VCC with local decoupling (0.1 µF ceramic cap) to prevent glitches during writes that could corrupt internal charge pumps.
What are the practical temperature and endurance limitations when using the 24LCS21A/P in industrial control systems with frequent parameter logging?
The 24LCS21A/P is rated for 0°C to 70°C ambient (TA), limiting its use in environments with sustained temperatures above 70°C—such as enclosed motor drives or outdoor enclosures—unless derated with forced cooling. For high-frequency logging, consider its 1M write cycle endurance per byte. At 100 writes per day per location, the EEPROM lasts ~27 years; however, if logging spans only a few bytes cyclically, those locations will wear out prematurely. Implement wear leveling in firmware (e.g., rotate storage locations) to extend life. Avoid continuous polling during its 10ms internal write cycle to prevent bus stalls. For harsher conditions, consider the extended-temp 24LC21A-IP version or use FRAM alternatives like the FM24V05 for higher endurance.
Is the 24LCS21A/P suitable for battery-backed applications running at 3V, and how does its write current affect low-power system design?
Yes, the 24LCS21A/P operates reliably at 3V, making it well-suited for battery-powered systems. However, its active write current (typically 3 mA at 5V, higher at 3V due to internal charge pump inefficiency) can impact power budget during writes. In sleep-mode systems, ensure the host microcontroller can tolerate momentary current spikes. To minimize impact: (1) batch write operations to reduce write cycle count, (2) disable other peripherals during EEPROM writes, and (3) use the device’s low standby current (<1 µA) advantage by returning to idle mode quickly. Avoid writing in ultra-low-power states where VCC droop might breach the minimum operating voltage during write cycles.
What are the PCB layout and signal integrity best practices when integrating the 24LCS21A/P in a noisy industrial environment with long I2C traces?
When laying out the 24LCS21A/P in electrically noisy environments, limit SDA and SCL trace lengths to under 30 cm and use twisted-pair wiring with ground shielding if running cables. Use pull-up resistors as close to the 24LCS21A/P as possible, sized between 2.2kΩ and 4.7kΩ depending on total bus capacitance (keep under 400 pF for 400 kHz). Add 100nF ceramic decoupling at the VDD pin and consider series resistors (100Ω) near the driver to dampen ringing. For long buses or high noise, use I2C buffers (e.g., PCA9515B) or isolators (Si8602). Avoid routing I2C lines adjacent to switching power or motor traces. The 900 ns access time of the 24LCS21A/P provides sufficient margin, but ringing or slow edges may cause false clocking—always validate with oscilloscope probing under real operating loads.
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.
24LCS21A/P CAD Models
Microchip Technology 24LCS21A/P PCB symbols & footprints
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