Microchip Technology 24LC22A-I/P EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The Microchip Technology 24LC22A-I/P is a 2Kbit EEPROM memory integrated circuit with I2C interface operating at 400 kHz. This non-volatile memory device is configured as 256 x 8 bits and packaged in an 8-DIP through-hole form factor. The part is currently in active production status and ROHS3 compliant. Substitute parts are necessary when the primary part is unavailable, when extended temperature ranges are required, or when higher clock frequency operation is needed for system performance optimization.

Key Parameters

Parameter	Value
Memory Size	2Kbit
Memory Organization	256 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	-40°C ~ 85°C
Package Type	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria applied strictly to the provided parameters:

Primary Substitution Criteria:

Memory size: 2Kbit (fixed requirement)
Memory organization: 256 x 8 (fixed requirement)
Memory interface: I2C (fixed requirement)
Package type: 8-DIP through-hole (fixed requirement)

Secondary Compatibility Parameters:

Clock frequency: 400 kHz minimum (higher frequencies are compatible)
Access time: 900 ns maximum (faster access times are compatible)
Write cycle time: 10 ms maximum (faster write cycles are compatible)
Voltage supply range: Must encompass or match the operating range
Operating temperature: Must support the required temperature range

Substitute parts are grouped into three categories based on their relationship to the main part specifications:

MFR Recommended Substitutes: Parts that meet all primary criteria with equal or improved secondary parameters.

Parametric Equivalents: Parts that meet all primary criteria with specifications that match or exceed the main part requirements.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Product Status
24LC22A-I/P	Microchip Technology	2Kbit	400 kHz	900 ns	10 ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-DIP	Active
24AA02-I/P	Microchip Technology	2Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-DIP	Active
24AA024-I/P	Microchip Technology	2Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-DIP	Active
24AA024H-I/P	Microchip Technology	2Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-DIP	Active
24LC02B-E/P	Microchip Technology	2Kbit	400 kHz	900 ns	5 ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-DIP	Active
34AA02-I/P	Microchip Technology	2Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-DIP	Active
34LC02-I/P	Microchip Technology	2Kbit	1 MHz	400 ns	5 ms	2.2V ~ 5.5V	-40°C ~ 85°C	8-DIP	Active
AT24HC02C-PUM	Microchip Technology	2Kbit	1 MHz	550 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-DIP	Active
24LC024-I/P	Microchip Technology	2Kbit	400 kHz	900 ns	5 ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-DIP	Active
24LC02B-I/P	Microchip Technology	2Kbit	400 kHz	900 ns	5 ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-DIP	Active
24LCS22A-I/P	Microchip Technology	2Kbit	400 kHz	900 ns	10 ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-DIP	Active

Engineering Selection Recommendations

For Direct Replacement with Enhanced Performance: The 24AA02-I/P and 24LC02B-I/P are suitable direct replacements. Both maintain the 400 kHz I2C clock frequency and 8-DIP package while offering faster write cycle times (5 ms versus 10 ms). The 24AA02-I/P extends the voltage supply range to 1.7V, providing greater flexibility in low-power applications. Both parts maintain active product status and ROHS3 compliance.

For Extended Temperature Operation: The 24LC02B-E/P supports an extended operating temperature range of -40°C to 125°C, compared to the standard -40°C to 85°C range of the 24LC22A-I/P. This part is suitable when thermal performance beyond standard industrial specifications is required. Product status is active with verified programmability.

For Higher Clock Frequency Requirements: The 34LC02-I/P and AT24HC02C-PUM operate at 1 MHz I2C clock frequency, providing 2.5x faster communication compared to the 400 kHz main part. Both maintain the 8-DIP package and 2Kbit memory organization. The 34LC02-I/P operates at 2.2V minimum supply voltage, while the AT24HC02C-PUM extends to 1.7V minimum. Both are active products with ROHS3 compliance.

For Low-Voltage Applications: Parts with 1.7V minimum supply voltage (24AA02-I/P, 24AA024-I/P, 24AA024H-I/P, 34AA02-I/P, AT24HC02C-PUM) are suitable when operation below 2.5V is required. All maintain the 2Kbit capacity and 8-DIP package configuration.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher clock frequency than the 24LC22A-I/P?

A: Yes. The 34LC02-I/P and AT24HC02C-PUM operate at 1 MHz I2C frequency. Higher clock frequencies are backward compatible with systems designed for 400 kHz operation. The I2C protocol allows devices to operate at lower speeds than their maximum rated frequency.

Q: What is the difference between 24AA02-I/P and 24LC02B-I/P?

A: Both are 2Kbit I2C EEPROM devices in 8-DIP packages with 400 kHz operation. The 24AA02-I/P supports 1.7V minimum supply voltage and has a 5 ms write cycle time. The 24LC02B-I/P requires 2.5V minimum supply voltage and also has a 5 ms write cycle time. Select 24AA02-I/P for low-voltage applications.

Q: Is the 24LCS22A-I/P a direct replacement for 24LC22A-I/P?

A: The 24LCS22A-I/P is a parametric equivalent. Both parts share identical clock frequency (400 kHz), access time (900 ns), voltage range (2.5V ~ 5.5V), temperature range (-40°C ~ 85°C), and 8-DIP package. Both have 10 ms write cycle times. This part is suitable as a direct replacement.

Q: Why do some substitute parts have faster write cycle times?

A: Write cycle time is the duration required to complete a single write operation. Faster write cycle times (5 ms versus 10 ms) indicate improved performance characteristics. These parts complete write operations in half the time, which may benefit applications requiring rapid sequential writes. Faster write cycles are compatible with systems designed for the original 10 ms specification.

Q: Can I use 34AA02-I/P in a 5V system?

A: Yes. The 34AA02-I/P supports a voltage supply range of 1.7V to 5.5V, which encompasses standard 5V operation. The part is suitable for 5V systems and also supports lower voltage operation down to 1.7V.

Q: What is the significance of the temperature range difference in 24LC02B-E/P?

A: The 24LC02B-E/P operates from -40°C to 125°C, extending 40°C beyond the standard -40°C to 85°C range. This extended upper temperature limit is necessary for applications in high-temperature environments such as automotive under-hood or industrial process control systems.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, consistent with the main part 24LC22A-I/P. All parts are also REACH unaffected and classified as EAR99 for export control purposes.

Q: Can I use a 1 MHz part in a system designed for 400 kHz?

A: Yes. The 34LC02-I/P and AT24HC02C-PUM operate at 1 MHz maximum I2C frequency. I2C is a synchronous protocol where the master device controls clock frequency. These parts operate correctly at any frequency up to their maximum rating, including 400 kHz systems. No firmware or hardware modifications are required.

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