Equivalent & Substitute Parts for 24LC21/SN

Part Overview

The 24LC21/SN is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 400 kHz with 900 ns access time. Packaged in 8-SOIC surface mount configuration, this non-volatile memory device operates across 2.5V to 5.5V supply voltage range and 0°C to 70°C temperature range. The part is active in production status and ROHS3 compliant. Equivalent and substitute parts are identified when they maintain functional compatibility across memory capacity, interface protocol, package type, and electrical operating parameters while accommodating application-specific requirements for temperature range, access speed, or supply voltage flexibility.

Key Parameters

Parameter	24LC21/SN
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	10 ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment across the following critical parameters: memory capacity (1Kbit), memory organization (128 x 8), interface protocol (I2C), package configuration (8-SOIC), and mounting type (surface mount). All substitute parts listed maintain these core functional requirements.

Secondary parameters that define substitution categories include clock frequency (400 kHz baseline), access time (900 ns or slower), write cycle time (5 ms or faster), supply voltage range (must encompass or exceed 2.5V ~ 5.5V), and operating temperature range (must encompass or exceed 0°C ~ 70°C). Parts are grouped by their ability to operate within the original part's electrical and thermal specifications, with extended-range variants identified separately.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Product Status
24LC21/SN	Microchip Technology	1Kbit	400 kHz	900 ns	10 ms	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active
24AA01-I/SN	Microchip Technology	1Kbit	400 kHz	3500 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA01/SN	Microchip Technology	1Kbit	400 kHz	3500 ns	5 ms	1.7V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active
24AA014-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA014H-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24LC014-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	5 ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24LC014H-I/SN	Microchip Technology	1Kbit	1 MHz	400 ns	5 ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24LC01B-E/SN	Microchip Technology	1Kbit	400 kHz	4.6 µs	5 ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active
24LC01B-I/SN	Microchip Technology	1Kbit	400 kHz	4.6 µs	5 ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24LC01B/SN	Microchip Technology	1Kbit	400 kHz	4.6 µs	5 ms	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active
24LC01BH-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	5 ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active

Engineering Selection Recommendations

Direct Substitutes (Matching Temperature Range 0°C ~ 70°C):

24LC01B/SN operates within the original 0°C to 70°C temperature specification with identical 2.5V to 5.5V supply voltage range and 8-SOIC package. This part is verified programmable and carries ROHS3 compliance. The 4.6 µs access time and 5 ms write cycle time are compatible with applications designed for the 24LC21/SN.

24AA01/SN provides identical temperature range coverage (0°C ~ 70°C) with extended supply voltage range (1.7V ~ 5.5V). This part is verified programmable and ROHS3 compliant, offering flexibility for lower-voltage applications while maintaining the original thermal envelope.

Extended Temperature Range Substitutes (-40°C ~ 85°C):

24AA014-I/SN, 24AA014H-I/SN, 24LC014-I/SN, and 24LC01B-I/SN all extend the operating temperature range to -40°C ~ 85°C. These parts maintain 1Kbit capacity, I2C interface, and 8-SOIC packaging. All are active production status and ROHS3 compliant. 24AA014-I/SN and 24AA014H-I/SN offer extended supply voltage (1.7V ~ 5.5V), while 24LC014-I/SN and 24LC01B-I/SN maintain 2.5V ~ 5.5V specification.

Enhanced Performance Substitute:

24LC014H-I/SN operates at 1 MHz clock frequency with 400 ns access time, providing faster I2C communication than the 24LC21/SN baseline. This part maintains -40°C ~ 85°C temperature range, 2.5V ~ 5.5V supply voltage, and 8-SOIC package. It is active production status and ROHS3 compliant.

Extended Temperature Capability:

24LC01B-E/SN extends the upper operating temperature to 125°C while maintaining 2.5V ~ 5.5V supply voltage and 8-SOIC package. This part is verified programmable and ROHS3 compliant, suitable for high-temperature applications.

All substitute parts are manufactured by Microchip Technology, carry ROHS3 compliance, and maintain the 8-SOIC surface mount package configuration. Selection should be based on specific application requirements for temperature range, supply voltage flexibility, and access time performance.

Frequently Asked Questions (FAQ)

Q: Can 24AA01-I/SN replace 24LC21/SN in all applications?

A: 24AA01-I/SN is functionally compatible for applications operating within 0°C to 70°C. The part maintains 1Kbit capacity, I2C interface, 400 kHz clock frequency, and 8-SOIC package. The extended supply voltage range (1.7V ~ 5.5V) provides additional flexibility. However, the 3500 ns access time is slower than the 24LC21/SN baseline of 900 ns. Verify that application timing requirements accommodate this difference.

Q: What is the difference between 24LC and 24AA series parts?

A: The 24LC series operates at 2.5V minimum supply voltage, while the 24AA series operates at 1.7V minimum. Both series maintain identical memory capacity, organization, and I2C interface. The 24AA series provides extended supply voltage flexibility for low-power applications. Temperature range and access time specifications vary by individual part number within each series.

Q: Is 24LC014H-I/SN a direct substitute for 24LC21/SN?

A: 24LC014H-I/SN maintains core functional compatibility: 1Kbit capacity, I2C interface, 8-SOIC package, and 2.5V ~ 5.5V supply voltage. However, it operates at 1 MHz clock frequency versus the 24LC21/SN baseline of 400 kHz, and provides 400 ns access time versus 900 ns. This part is suitable for applications requiring faster I2C communication. The extended temperature range (-40°C ~ 85°C) exceeds the original specification.

Q: Can I use a part with extended temperature range (-40°C ~ 85°C) in place of 24LC21/SN (0°C ~ 70°C)?

A: Yes. Parts with -40°C ~ 85°C operating range are backward compatible with applications designed for 0°C ~ 70°C operation. The extended range provides additional margin for thermal stress and environmental variation. All listed extended-range substitutes maintain identical memory capacity, interface protocol, and package configuration.

Q: What does MSL (Moisture Sensitivity Level) indicate for these parts?

A: MSL 1 indicates unlimited shelf life under controlled storage conditions. MSL 3 indicates 168 hours of shelf life. All listed substitute parts carry either MSL 1 or MSL 3 ratings. MSL classification affects storage and handling procedures but does not impact functional performance or electrical characteristics.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the original 24LC21/SN specification. This ensures compatibility with environmental and regulatory requirements across global markets.

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