24LCS21A-I/P EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LCS21A-I/P is a 1Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for I2C serial communication applications operating at 400 kHz. This non-volatile memory device is housed in an 8-DIP through-hole package and operates across a supply voltage range of 2.5V to 5.5V with an operating temperature range of -40°C to 85°C. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity level rating. Equivalent and substitute parts are identified based on matching core electrical specifications, package compatibility, and functional equivalence for direct circuit board replacement applications.

Substiute Parts

24LCS21A-I/P

Microchip TechnologyIn Stock: 105824LCS21A-I/P Datasheet

Current PartRFQ

24AA01-I/P

Microchip TechnologyIn Stock: 251224AA01-I/P Datasheet

MFR RecommendedRFQ

24LC01B-I/P

Microchip TechnologyIn Stock: 1031124LC01B-I/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 24LCS21A-I/P are qualified based on the following mandatory electrical and mechanical parameters:

• Memory capacity: 1Kbit (128 x 8 organization)
• Interface protocol: I2C serial communication
• Clock frequency: 400 kHz operation
• Package format: 8-DIP through-hole configuration
• Physical dimensions: 0.300" (7.62mm) DIP spacing
• Supply voltage compatibility: Overlapping operational ranges
• Operating temperature range: -40°C to 85°C minimum
• Non-volatile EEPROM technology
• RoHS3 compliance status

The identified substitute parts 24AA01-I/P and 24LC01B-I/P meet all core functional and mechanical requirements for direct replacement in circuit applications requiring 1Kbit I2C EEPROM memory with 400 kHz bus speed operation.

Parameter Comparison

Engineering Selection Recommendations

All three parts—24LCS21A-I/P, 24AA01-I/P, and 24LC01B-I/P—are manufactured by Microchip Technology and maintain active production status. Each part carries ROHS3 compliance certification and unlimited moisture sensitivity level rating, meeting current environmental and regulatory requirements for industrial and commercial applications.

The 24LCS21A-I/P and 24LC01B-I/P share identical supply voltage specifications (2.5V ~ 5.5V), while the 24AA01-I/P extends the lower voltage limit to 1.7V, providing broader operational flexibility in low-power applications. All three devices operate within the same temperature range (-40°C to 85°C) and utilize identical 8-DIP through-hole packaging, ensuring mechanical and thermal compatibility in existing circuit board designs.

Selection between these parts depends on specific application requirements regarding access time performance and minimum supply voltage constraints. The 24LCS21A-I/P offers the fastest access time at 900 ns, while both substitute parts provide 5 ms write cycle times compared to the main part's 10 ms specification.

Frequently Asked Questions (FAQ)

Q: Can 24AA01-I/P replace 24LCS21A-I/P in all applications?

A: The 24AA01-I/P is functionally equivalent for I2C EEPROM applications requiring 1Kbit memory capacity. The primary difference is extended lower voltage operation (1.7V minimum versus 2.5V). Access time differs (3500 ns versus 900 ns), which may affect timing-critical applications. Both parts use identical 8-DIP packaging and operate at 400 kHz I2C bus speed.

Q: What is the difference between 24LC01B-I/P and 24AA01-I/P?

A: Both parts provide 1Kbit I2C EEPROM memory in 8-DIP packages with 400 kHz operation. The 24LC01B-I/P maintains the same 2.5V minimum supply voltage as the 24LCS21A-I/P, while 24AA01-I/P operates from 1.7V. Access time specifications are equivalent (4.6 µs). The 24AA01-I/P is verified as DiGi-Electronics programmable, while 24LC01B-I/P verification status is also confirmed.

Q: Are these parts pin-compatible?

A: Yes. All three parts use 8-DIP through-hole packaging with 0.300" (7.62mm) spacing. Pin configuration and I2C interface protocol are identical, enabling direct socket replacement without circuit board modifications.

Q: Do all parts meet current compliance standards?

A: All three parts carry ROHS3 compliance certification and REACH unaffected status. Moisture sensitivity level is rated as 1 (Unlimited) for all devices, meeting current environmental and regulatory requirements for industrial applications.

Q: Which part should be selected for lowest power applications?

A: The 24AA01-I/P supports operation down to 1.7V supply voltage, making it suitable for battery-powered and low-voltage applications. The 24LCS21A-I/P and 24LC01B-I/P require minimum 2.5V supply voltage.