AT34C02C-TH-B EEPROM Equivalent & Substitute Parts

Part Overview

The AT34C02C-TH-B is a 2Kbit I2C EEPROM memory IC manufactured by Microchip Technology, packaged in 8-TSSOP surface mount configuration. This part operates at 400 kHz clock frequency with 900 ns access time and supports supply voltages from 1.7V to 5.5V across the -40°C to 85°C temperature range. The AT34C02C-TH-B is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Direct replacements and parametric equivalents are available from Microchip's active product portfolio.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	2Kbit
Memory Organization	256 x 8
Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5 ms
Supply Voltage Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the AT34C02C-TH-B is determined by strict equivalence across the following critical parameters: memory size (2Kbit), memory organization (256 x 8), I2C interface, package type (8-TSSOP), and supply voltage range (1.7V ~ 5.5V). Parts are grouped into three categories based on substitution relationship:

Direct Manufacturer Substitutes maintain identical electrical specifications including 400 kHz clock frequency and 900 ns access time. These parts are pin-compatible and functionally interchangeable with the obsolete AT34C02C-TH-B.

Upgrade Substitutes offer enhanced performance characteristics, including higher clock frequency (1 MHz) or extended operating temperature ranges (-40°C ~ 125°C), while maintaining full backward compatibility with the original part's pinout and core functionality.

Parametric Equivalents match all critical electrical and mechanical parameters but may differ in packaging format (tube, tape & reel, or bulk). These parts are functionally equivalent and suitable for direct replacement in circuit designs.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Supply Voltage	Operating Temperature	Package	Product Status	MSL Rating
AT34C02C-TH-B	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete	1
24AA024H-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	1
34AA02T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	1
34AA02T-E/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active	1
34AA02-E/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active	1
AT24CS02-XHM-T	Microchip Technology	2Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	1
AT24HC02C-XHM-B	Microchip Technology	2Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	1
AT34C02D-XHM-B	Microchip Technology	2Kbit	1 MHz	Not Specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	3
24AA02-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	1
24AA024-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	1
24AA025-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	1

Engineering Selection Recommendations

For direct replacement of the obsolete AT34C02C-TH-B in existing designs, select from the active product status parts that maintain identical electrical specifications: 24AA024H-I/ST, 34AA02T-I/ST, 24AA02-I/ST, 24AA024-I/ST, or 24AA025-I/ST. All these parts are ROHS3 compliant with MSL rating 1 and support the full -40°C to 85°C operating temperature range.

For applications requiring extended temperature operation to 125°C, specify 34AA02T-E/ST or 34AA02-E/ST. Both maintain the 400 kHz clock frequency and 900 ns access time of the original part while offering enhanced thermal performance.

For applications where higher clock frequency (1 MHz) and faster access time (550 ns) provide system benefits, AT24CS02-XHM-T or AT24HC02C-XHM-B are suitable upgrades. These parts maintain full backward compatibility with the AT34C02C-TH-B pinout and are ROHS3 compliant.

All recommended substitutes are manufactured by Microchip Technology, ROHS3 compliant, and REACH unaffected. Packaging format selection (tube, tape & reel, or bulk) should be determined by procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can 24AA024H-I/ST directly replace AT34C02C-TH-B in production?

A: Yes. The 24AA024H-I/ST is a direct substitute with identical memory size (2Kbit), I2C interface, clock frequency (400 kHz), access time (900 ns), supply voltage range (1.7V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and 8-TSSOP package. Both parts are ROHS3 compliant with MSL rating 1.

Q: What is the difference between 34AA02T-I/ST and 34AA02T-E/ST?

A: Both parts share identical electrical specifications (2Kbit, 400 kHz, 900 ns, 1.7V ~ 5.5V). The primary difference is operating temperature range: 34AA02T-I/ST operates -40°C to 85°C, while 34AA02T-E/ST extends to -40°C to 125°C. Select 34AA02T-E/ST for applications requiring higher temperature performance.

Q: Are AT24CS02-XHM-T and AT24HC02C-XHM-B backward compatible with AT34C02C-TH-B?

A: Yes. Both parts maintain the 8-TSSOP pinout and I2C interface. They offer enhanced performance with 1 MHz clock frequency and 550 ns access time compared to the original 400 kHz and 900 ns specifications. These upgrades are suitable for designs where faster memory access is beneficial.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in multiple packaging formats: Tube (24AA024H-I/ST, 34AA02-E/ST, 24AA02-I/ST, 24AA024-I/ST, 24AA025-I/ST), Tape & Reel (34AA02T-I/ST), Cut Tape & Digi-Reel (34AA02T-E/ST, AT24CS02-XHM-T), and Bulk (AT24HC02C-XHM-B). Select based on assembly and procurement requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the AT34C02C-TH-B.

Q: What is the MSL rating difference between AT34C02D-XHM-B and other substitutes?

A: AT34C02D-XHM-B has MSL rating 3 (168 hours), while all other substitutes maintain MSL rating 1 (unlimited). MSL rating 3 requires moisture control during storage and handling. For applications with standard moisture sensitivity requirements, select parts with MSL rating 1.

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