Equivalent & Substitute Parts for 34LC02T-E/ST

Part Overview

The 34LC02T-E/ST is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 1 MHz clock frequency and 8-TSSOP surface mount packaging. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified to provide design flexibility, inventory alternatives, and extended sourcing options while maintaining functional and electrical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value
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 ~ 125°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Memory capacity (2Kbit), memory organization (256 x 8), I2C interface protocol, and 8-TSSOP package form factor are mandatory matching criteria. Clock frequency tolerance, access time, voltage supply range, and operating temperature range define functional compatibility bands. Parts operating at 400 kHz clock frequency are compatible with 1 MHz designs due to backward compatibility of I2C protocol. Access time variations (400 ns to 900 ns) are acceptable within I2C timing specifications. Voltage supply ranges must encompass or overlap the main part specification. Operating temperature ranges of -40°C ~ 85°C are compatible with -40°C ~ 125°C applications within the -40°C ~ 85°C overlap window. RoHS3 compliance and MSL ratings are regulatory and handling requirements that must be maintained.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	MSL Rating	Inventory
34LC02T-E/ST	Microchip Technology	2Kbit	1 MHz	400 ns	2.2V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	3	895 Pcs
34AA02T-E/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	1	2040 Pcs
BR24G02FVT-3GE2	Rohm Semiconductor	2Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	1	3225 Pcs
BR24L02FVT-WE2	Rohm Semiconductor	2Kbit	400 kHz	Not specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	1	8215 Pcs
BR34E02FVT-3E2	Rohm Semiconductor	2Kbit	400 kHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	1	976 Pcs
M24C02-DRDW3TP/K	STMicroelectronics	2Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	1	2628 Pcs
M24C02-FDW6TP	STMicroelectronics	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	17178 Pcs
M34E02-FDW6TP	STMicroelectronics	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	41228 Pcs
R1EX24002ATAS0I#U0	Renesas Electronics Corporation	2Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	3700 Pcs

Engineering Selection Recommendations

All substitute parts maintain ROHS3 compliance and Active product status. Selection between substitute options depends on specific application requirements:

For applications requiring full temperature range operation (-40°C ~ 125°C), 34AA02T-E/ST and M24C02-DRDW3TP/K are compatible. M24C02-DRDW3TP/K includes AEC-Q100 automotive qualification and is suitable for automotive-grade applications.

For general industrial applications with -40°C ~ 85°C temperature range, M34E02-FDW6TP offers the highest inventory availability (41228 Pcs) and verified programmability status. M24C02-FDW6TP provides equivalent specifications with substantial inventory (17178 Pcs).

For applications with lower voltage supply requirements (1.6V minimum), BR24G02FVT-3GE2 is suitable. For standard 1.7V ~ 5.5V or 1.8V ~ 5.5V ranges, Rohm Semiconductor options (BR24L02FVT-WE2, BR34E02FVT-3E2) and Renesas R1EX24002ATAS0I#U0 provide alternatives.

MSL rating differences (MSL 3 for main part versus MSL 1 for substitutes) indicate improved moisture handling for substitute parts, reducing reflow process constraints.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 400 kHz I2C EEPROM for the 1 MHz 34LC02T-E/ST?

A: Yes. I2C protocol supports backward compatibility where slower clock frequency devices operate correctly in systems designed for higher frequencies. The 34LC02T-E/ST operates at 1 MHz; substitute parts at 400 kHz will function in this application with no functional impact.

Q: What is the significance of access time differences (400 ns vs. 900 ns)?

A: Access time defines the delay from address input to data output availability. Both values fall within I2C timing specifications. The 34LC02T-E/ST at 400 ns provides faster response; 900 ns substitutes introduce minimal latency impact in typical I2C bus applications.

Q: Are 8-TSSOP and 8-TSSOP-B packages interchangeable?

A: Both packages are 8-pin TSSOP with identical 0.173" width and 4.40mm dimensions. The "-B" designation indicates Rohm Semiconductor's variant. Pin configuration and footprint compatibility must be verified against specific PCB design requirements.

Q: Why do substitute parts have MSL 1 rating while the main part is MSL 3?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control; MSL 3 requires controlled storage (168 hours maximum at specified humidity). Substitute parts with MSL 1 provide superior handling flexibility and reduced reflow process constraints.

Q: Which substitute part is recommended for automotive applications?

A: M24C02-DRDW3TP/K includes AEC-Q100 automotive qualification and operates across the full -40°C ~ 125°C temperature range, making it suitable for automotive-grade designs.

Q: What is the inventory advantage of selecting M34E02-FDW6TP?

A: M34E02-FDW6TP maintains the highest inventory availability at 41228 Pcs with verified programmability status, providing supply chain reliability and reduced lead time risk.

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