Equivalent & Substitute Parts for 34LC02-I/ST

Part Overview

The 34LC02-I/ST is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface communication at 1 MHz clock frequency. This non-volatile memory device is packaged in 8-TSSOP surface mount configuration and operates across the industrial temperature range of -40°C to 85°C. The part is currently in active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching core electrical and mechanical specifications: 2Kbit memory capacity, 256 x 8 memory organization, I2C interface protocol, 8-TSSOP package format, and compatible operating temperature range. Substitutes may vary in clock frequency (400 kHz or 1 MHz), access time, and supply voltage range while maintaining functional compatibility in most applications.

Key Parameters

Parameter	34LC02-I/ST
Memory Size	2Kbit
Memory Organization	256 x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	400 ns
Write Cycle Time	5 ms
Voltage Supply Range	2.2V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 34LC02-I/ST are grouped into two primary categories based on clock frequency compatibility:

Category 1: 1 MHz Clock Frequency Substitutes These parts maintain the same 1 MHz I2C clock speed as the main part, ensuring direct functional equivalence in timing-critical applications. Substitutes in this category include AT24CS02-XHM-T, AT24HC02C-XHM-B, BR24G02FVT-3AGE2, and BR34E02FVT-3E2. These parts share identical memory capacity, organization, package format, and operating temperature range. Variations exist in access time (550 ns vs. 400 ns) and supply voltage minimums (1.6V to 1.7V vs. 2.2V).

Category 2: 400 kHz Clock Frequency Substitutes These parts operate at reduced I2C clock frequency (400 kHz), suitable for applications where lower speed operation is acceptable. This category includes 24AA02-I/ST, 24AA024-I/ST, BR24G02FVT-3GE2, BR24L02FVT-WE2, BR24T02FVT-WGE2, CAT34C02YI-GT5A, and BR34E02FVT-3E2. All maintain 2Kbit capacity, 256 x 8 organization, I2C interface, 8-TSSOP package, and -40°C to 85°C operating range. Access time increases to 900 ns, and supply voltage minimums range from 1.6V to 1.7V.

Critical Substitution Parameters:

Memory Size: 2Kbit (mandatory)
Memory Organization: 256 x 8 (mandatory)
Memory Interface: I2C (mandatory)
Package / Case: 8-TSSOP (mandatory)
Operating Temperature: -40°C ~ 85°C (mandatory)
Write Cycle Time: 5 ms (mandatory)

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Package	Inventory
34LC02-I/ST	Microchip Technology	2Kbit	1 MHz	400 ns	2.2V ~ 5.5V	8-TSSOP	884 Pcs
24AA02-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-TSSOP	3200 Pcs
24AA024-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-TSSOP	1342 Pcs
AT24CS02-XHM-T	Microchip Technology	2Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-TSSOP	15684 Pcs
AT24HC02C-XHM-B	Microchip Technology	2Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-TSSOP	2062 Pcs
BR24G02FVT-3AGE2	Rohm Semiconductor	2Kbit	1 MHz	Not Specified	1.6V ~ 5.5V	8-TSSOP-B	2665 Pcs
BR24G02FVT-3GE2	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	8-TSSOP-B	3225 Pcs
BR24L02FVT-WE2	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	1.8V ~ 5.5V	8-TSSOP-B	8215 Pcs
BR24T02FVT-WGE2	ROHM Semiconductor	2Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	8-TSSOP-B	2360 Pcs
BR34E02FVT-3E2	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	1.7V ~ 5.5V	8-TSSOP-B	976 Pcs
CAT34C02YI-GT5A	onsemi	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-TSSOP	21561 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain active product status with full RoHS3 compliance and REACH unaffected certification, matching the regulatory compliance profile of the 34LC02-I/ST. Selection between substitutes depends on application-specific timing and voltage requirements.

For applications requiring 1 MHz I2C clock frequency operation, AT24CS02-XHM-T and AT24HC02C-XHM-B from Microchip Technology provide direct speed equivalence. These parts accept lower minimum supply voltage (1.7V) compared to the main part (2.2V), expanding operational flexibility in low-power designs. BR24G02FVT-3AGE2 from Rohm Semiconductor offers 1 MHz operation with the lowest minimum supply voltage (1.6V).

For applications tolerating 400 kHz I2C clock frequency, multiple options exist across manufacturers. Microchip Technology's 24AA02-I/ST and 24AA024-I/ST provide established compatibility within the same manufacturer ecosystem. Rohm Semiconductor's BR24L02FVT-WE2 offers the highest inventory availability (8215 Pcs) among 400 kHz options. onsemi's CAT34C02YI-GT5A provides 400 kHz operation with 900 ns access time specification and substantial inventory (21561 Pcs).

Supply voltage range compatibility must be verified for designs operating below 1.7V, as the main part supports operation down to 2.2V while most substitutes operate from 1.6V or 1.7V minimum.

Frequently Asked Questions (FAQ)

Q: Can 400 kHz clock frequency substitutes replace the 34LC02-I/ST in all applications?

A: 400 kHz substitutes are compatible only in applications where reduced I2C clock speed does not impact system timing requirements. Applications with strict timing constraints or high-speed I2C bus requirements must use 1 MHz frequency substitutes (AT24CS02-XHM-T, AT24HC02C-XHM-B, or BR24G02FVT-3AGE2).

Q: What is the difference between 8-TSSOP and 8-TSSOP-B packages?

A: Both package designations refer to 8-pin thin shrink small outline packages with identical 0.173" width and 4.40mm dimensions. The "-B" suffix used by Rohm Semiconductor indicates their specific package variant. Physical compatibility is maintained for PCB footprints designed for standard 8-TSSOP.

Q: Are there supply voltage compatibility concerns when substituting parts?

A: The 34LC02-I/ST operates from 2.2V to 5.5V. Most substitute parts operate from 1.6V or 1.7V minimum. In designs operating between 1.6V and 2.2V, substitutes provide expanded voltage range capability. In designs requiring operation above 2.2V, all substitutes remain fully compatible.

Q: Which substitute offers the best inventory availability?

A: CAT34C02YI-GT5A from onsemi provides the highest inventory level at 21561 Pcs, followed by AT24CS02-XHM-T at 15684 Pcs. Both parts are in active product status with full compliance certifications.

Q: How do access time differences affect substitution decisions?

A: The 34LC02-I/ST specifies 400 ns access time. Substitutes with 550 ns or 900 ns access times introduce longer read latency. Applications with strict timing requirements must verify that increased access time does not violate system specifications. Most general-purpose I2C EEPROM applications tolerate these variations without functional impact.

Q: Can parts from different manufacturers be mixed in the same design?

A: Yes. All listed substitutes maintain identical I2C protocol implementation, memory organization, and package format. Cross-manufacturer substitution is supported provided that clock frequency, voltage range, and access time specifications align with application requirements.

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