AT34C02C-TH-T Equivalent & Substitute Parts

Part Overview

The AT34C02C-TH-T is a 2Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This device operates at 400 kHz clock frequency with 900 ns access time and supports a supply voltage range of 1.7V to 5.5V across an operating temperature range of -40°C to 85°C. The part is mounted in an 8-TSSOP package and is currently classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support and production continuity.

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	5ms
Voltage Supply 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
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the AT34C02C-TH-T are classified based on strict parameter matching across the following criteria:

Direct Substitutes maintain identical electrical and mechanical specifications: 2Kbit memory size, 256 x 8 organization, I2C interface, 400 kHz clock frequency, 900 ns access time, 5ms write cycle time, 1.7V to 5.5V supply voltage, -40°C to 85°C operating temperature range, and 8-TSSOP package.

Upgrade Substitutes offer enhanced operating temperature ranges (-40°C to 125°C) while maintaining all other core electrical parameters, providing extended thermal capability for demanding applications.

Performance-Enhanced Substitutes operate at 1 MHz clock frequency with 550 ns access time, representing faster I2C operation while preserving 2Kbit capacity and 8-TSSOP packaging. These parts are backward compatible in applications not requiring the original 400 kHz specification.

Manufacturer-Recommended Substitutes are designated by Microchip Technology as preferred alternatives, with varying packaging options and product status classifications.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Operating Temperature	Package	Product Status	Inventory
AT34C02C-TH-T	Microchip Technology	2Kbit	400 kHz	900 ns	-40°C ~ 85°C	8-TSSOP	Obsolete	65200 Pcs
24AA024H-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	-40°C ~ 85°C	8-TSSOP	Active	1108 Pcs
34AA02-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	-40°C ~ 85°C	8-TSSOP	Active	671 Pcs
34AA02-E/ST	Microchip Technology	2Kbit	400 kHz	900 ns	-40°C ~ 125°C	8-TSSOP	Active	658 Pcs
24AA02/ST	Microchip Technology	2Kbit	400 kHz	900 ns	0°C ~ 70°C	8-TSSOP	Active	2200 Pcs
34AA02T-E/ST	Microchip Technology	2Kbit	400 kHz	900 ns	-40°C ~ 125°C	8-TSSOP	Active	2040 Pcs
AT24CS02-XHM-T	Microchip Technology	2Kbit	1 MHz	550 ns	-40°C ~ 85°C	8-TSSOP	Active	15684 Pcs
AT24HC02C-XHM-T	Microchip Technology	2Kbit	1 MHz	550 ns	-40°C ~ 85°C	8-TSSOP	Active	5546 Pcs
AT34C02D-XHM-T	Microchip Technology	2Kbit	1 MHz	900 ns	-40°C ~ 85°C	8-TSSOP	Active	7447 Pcs
24AA024HT-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	-40°C ~ 85°C	8-TSSOP	Active	3204 Pcs
24AA024T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	-40°C ~ 85°C	8-TSSOP	Active	2100 Pcs

Engineering Selection Recommendations

For Direct Replacement: Select 24AA024H-I/ST, 34AA02-I/ST, 24AA024HT-I/ST, or 24AA024T-I/ST. These parts maintain identical electrical specifications and 8-TSSOP packaging. All are active products with ROHS3 compliance and MSL 1 rating. The 24AA024T-I/ST carries verified programmability status.

For Extended Temperature Operation: Select 34AA02-E/ST or 34AA02T-E/ST. Both support -40°C to 125°C operating range while preserving all other core parameters. These are active products with ROHS3 compliance.

For Restricted Temperature Range Applications: The 24AA02/ST operates within 0°C to 70°C and is suitable for controlled environment applications. This part is active with ROHS3 compliance and higher inventory availability.

For Enhanced Performance: Select AT24CS02-XHM-T, AT24HC02C-XHM-T, or AT34C02D-XHM-T for 1 MHz I2C operation. AT24CS02-XHM-T and AT24HC02C-XHM-T offer 550 ns access time. All three are active products with ROHS3 compliance and strong inventory levels.

All substitute parts are ROHS3 compliant, REACH unaffected, and carry EAR99 or equivalent export classification matching the original part.

Frequently Asked Questions (FAQ)

Q: Can I use AT24CS02-XHM-T as a direct replacement for AT34C02C-TH-T?

A: AT24CS02-XHM-T is functionally compatible but operates at 1 MHz clock frequency versus the original 400 kHz specification. The faster clock speed and 550 ns access time represent performance enhancements. Verify your application does not require the specific 400 kHz timing before substitution.

Q: What is the difference between 24AA024H-I/ST and 24AA024HT-I/ST?

A: Both parts maintain identical electrical specifications: 2Kbit capacity, 400 kHz I2C operation, 900 ns access time, and 8-TSSOP packaging. The primary difference is packaging format: 24AA024H-I/ST is supplied in Tube, while 24AA024HT-I/ST is supplied in Tape & Reel format.

Q: Should I select 34AA02-E/ST for applications requiring extended temperature range?

A: Yes. The 34AA02-E/ST supports -40°C to 125°C operating temperature, extending the upper limit by 40°C compared to the original -40°C to 85°C specification. All other electrical parameters remain identical. This part is active with full ROHS3 compliance.

Q: Are all substitute parts available in 8-TSSOP packaging?

A: Yes. All listed substitute parts are packaged in 8-TSSOP (0.173", 4.40mm Width) surface mount configuration, maintaining mechanical compatibility with the original AT34C02C-TH-T.

Q: What is the significance of MSL rating differences?

A: The original AT34C02C-TH-T carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Most substitute parts maintain MSL 1 rating. The AT34C02D-XHM-T carries MSL 3 (168 Hours), requiring controlled storage and handling within 168 hours of package opening.

Q: Which substitute offers the best inventory availability?

A: AT24CS02-XHM-T provides the highest inventory level at 15,684 pieces, followed by AT34C02D-XHM-T at 7,447 pieces. Both are active products with immediate availability.

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