AT24C08B-TH-B Equivalent & Substitute Parts

Part Overview

The AT24C08B-TH-B is an 8Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This device operates at 1 MHz clock frequency with 550 ns access time and supports a supply voltage range of 1.8V to 5.5V. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring 8Kbit EEPROM functionality in 8-TSSOP packaging.

Key Parameters

Parameter	Value
Memory Size	8Kbit
Memory Format	EEPROM
Memory Organization	1K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the AT24C08B-TH-B is determined by the following critical parameters:

Primary Substitution Criteria:

Memory size: 8Kbit
Package type: 8-TSSOP (0.173", 4.40mm Width)
Memory format: EEPROM
RoHS3 compliance
Moisture Sensitivity Level: 1 (Unlimited)

Interface-Based Grouping:

The substitute parts are organized into two functional categories based on memory interface type:

I2C Interface Substitutes - Direct functional equivalents with identical I2C protocol compatibility
Microwire Interface Substitutes - Alternative interface protocol requiring circuit redesign; not pin-compatible

The AT24C08C-XHM-T and 24AA08-I/ST maintain I2C interface compatibility with the original part. The 93C76 and 93LC76 series parts use Microwire protocol and represent functional alternatives only for applications where interface protocol can be accommodated through design modification.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Interface	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Product Status	Package
AT24C08B-TH-B	Microchip Technology	8Kbit	I2C	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	Obsolete	8-TSSOP
AT24C08C-XHM-T	Microchip Technology	8Kbit	I2C	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	Active	8-TSSOP
24AA08-I/ST	Microchip Technology	8Kbit	I2C	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	Active	8-TSSOP
93C76A-E/ST	Microchip Technology	8Kbit	Microwire	3 MHz	N/A	4.5V ~ 5.5V	-40°C ~ 125°C	Active	8-TSSOP
93C76A-I/ST	Microchip Technology	8Kbit	Microwire	3 MHz	N/A	4.5V ~ 5.5V	-40°C ~ 85°C	Active	8-TSSOP
93C76AT-E/ST	Microchip Technology	8Kbit	Microwire	3 MHz	N/A	4.5V ~ 5.5V	-40°C ~ 125°C	Active	8-TSSOP
93C76AT-I/ST	Microchip Technology	8Kbit	Microwire	3 MHz	N/A	4.5V ~ 5.5V	-40°C ~ 85°C	Active	8-TSSOP
93LC76A-E/ST	Microchip Technology	8Kbit	Microwire	3 MHz	N/A	2.5V ~ 5.5V	-40°C ~ 125°C	Active	8-TSSOP
93LC76A-I/ST	Microchip Technology	8Kbit	Microwire	3 MHz	N/A	2.5V ~ 5.5V	-40°C ~ 85°C	Active	8-TSSOP
93LC76AT-E/ST	Microchip Technology	8Kbit	Microwire	3 MHz	N/A	2.5V ~ 5.5V	-40°C ~ 125°C	Active	8-TSSOP
93LC76AT-I/ST	Microchip Technology	8Kbit	Microwire	3 MHz	N/A	2.5V ~ 5.5V	-40°C ~ 85°C	Active	8-TSSOP

Engineering Selection Recommendations

For Direct I2C Replacement:

AT24C08C-XHM-T is the primary substitute for AT24C08B-TH-B. Both parts maintain identical I2C interface protocol, 1 MHz clock frequency, 550 ns access time, and 8-TSSOP packaging. The AT24C08C-XHM-T is in active production status with expanded inventory availability (15,400 pcs) compared to the obsolete original part. Supply voltage range is marginally lower (1.7V minimum vs. 1.8V), which is acceptable for most applications operating above 1.7V.

For Lower Clock Frequency Applications:

24AA08-I/ST operates at 400 kHz with 900 ns access time, suitable for applications where reduced clock frequency is acceptable. This part maintains I2C interface compatibility and 8-TSSOP packaging. Operating temperature range matches the original part (-40°C to 85°C).

For Microwire Protocol Applications:

The 93C76 and 93LC76 series parts provide 8Kbit EEPROM functionality in 8-TSSOP packaging with Microwire interface. These parts are not pin-compatible with the original AT24C08B-TH-B and require circuit redesign. Selection between 93C76 and 93LC76 series depends on supply voltage requirements: 93C76 operates at 4.5V to 5.5V, while 93LC76 supports lower voltage operation at 2.5V to 5.5V. Temperature-rated variants (-E/ST for -40°C to 125°C, -I/ST for -40°C to 85°C) are available within each series.

All substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) rating consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can AT24C08C-XHM-T be used as a direct replacement for AT24C08B-TH-B?

A: Yes. Both parts share identical I2C interface, 1 MHz clock frequency, 550 ns access time, 8Kbit capacity, and 8-TSSOP packaging. The AT24C08C-XHM-T is in active production and is the recommended substitute.

Q: What is the difference between AT24C08C-XHM-T and 24AA08-I/ST?

A: Both are I2C EEPROM parts in 8-TSSOP packaging with 8Kbit capacity. The AT24C08C-XHM-T operates at 1 MHz with 550 ns access time. The 24AA08-I/ST operates at 400 kHz with 900 ns access time. Select AT24C08C-XHM-T for applications requiring 1 MHz operation; select 24AA08-I/ST for applications compatible with 400 kHz operation.

Q: Are Microwire parts (93C76, 93LC76) compatible with I2C circuits?

A: No. Microwire and I2C are different serial communication protocols. The 93C76 and 93LC76 series parts require circuit redesign and are not pin-compatible with the AT24C08B-TH-B.

Q: What is the difference between 93C76 and 93LC76 series?

A: The 93C76 series operates at 4.5V to 5.5V supply voltage. The 93LC76 series supports lower voltage operation at 2.5V to 5.5V. Both series provide 8Kbit Microwire EEPROM in 8-TSSOP packaging with 3 MHz clock frequency.

Q: What do the temperature suffixes (-E/ST and -I/ST) indicate?

A: The -E/ST suffix indicates operating temperature range of -40°C to 125°C. The -I/ST suffix indicates operating temperature range of -40°C to 85°C. Select based on application temperature requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) rating consistent with the original AT24C08B-TH-B.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message