24AA00T/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24AA00T/ST is a 128-bit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for I2C serial communication applications operating at 400 kHz. This device provides non-volatile memory storage in a compact 8-TSSOP surface mount package with a supply voltage range of 1.8V to 5.5V and an operating temperature range of 0°C to 70°C.

The 24AA00T/ST is classified as an obsolete product. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for systems utilizing this memory IC.

Key Parameters

Parameter	Value
Memory Size	128 bit
Memory Format	EEPROM
Memory Organization	16 x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	3500 ns
Write Cycle Time	4 ms
Voltage Supply Range	1.8V ~ 5.5V
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 24AA00T/ST is determined by strict equivalence across the following critical parameters:

Memory capacity, organization, and interface protocol must remain identical. The 128-bit capacity with 16 x 8 organization and I2C interface at 400 kHz are non-negotiable specifications for functional compatibility.

Electrical characteristics including supply voltage range (1.8V ~ 5.5V), access time (3500 ns), and write cycle time (4 ms) must match or exceed the original specification.

Package and mounting specifications must be identical: 8-TSSOP surface mount package with 0.173" width (4.40 mm).

Compliance certifications including RoHS3 and REACH status must be maintained.

The substitute part 24AA00T-I/ST meets all these criteria while offering extended operating temperature range and active product status.

Parameter Comparison

Parameter	24AA00T/ST (Main Part)	24AA00T-I/ST (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	128 bit	128 bit
Memory Format	EEPROM	EEPROM
Memory Organization	16 x 8	16 x 8
Memory Interface	I2C	I2C
Clock Frequency	400 kHz	400 kHz
Access Time	3500 ns	3500 ns
Write Cycle Time	4 ms	4 ms
Voltage Supply Range	1.8V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package Type	8-TSSOP	8-TSSOP
Mounting Type	Surface Mount	Surface Mount
Packaging Format	Tube	Tape & Reel (TR)
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The 24AA00T-I/ST is the direct equivalent substitute for the obsolete 24AA00T/ST. Both parts are manufactured by Microchip Technology and maintain identical electrical and functional specifications across all critical parameters.

The substitute part offers two significant advantages: active product status ensures long-term availability and supply chain continuity, and extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C) provides broader environmental compatibility for applications requiring wider temperature operation.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for electronic component use.

The packaging format difference (Tape & Reel for the substitute versus Tube for the main part) reflects standard industry practice for active products and does not affect functional compatibility or circuit performance.

Frequently Asked Questions (FAQ)

Q: Can the 24AA00T-I/ST be used as a direct replacement for the 24AA00T/ST?

A: Yes. The 24AA00T-I/ST is functionally equivalent across all electrical specifications, memory capacity, interface protocol, and package dimensions. No circuit modifications are required.

Q: What is the difference between the two part numbers?

A: The primary differences are product status (obsolete versus active) and operating temperature range. The 24AA00T-I/ST supports -40°C to 85°C operation compared to 0°C to 70°C for the original part. All other specifications are identical.

Q: Does the packaging format change affect compatibility?

A: No. The Tape & Reel packaging format of the substitute part is a supply chain consideration only. The physical component, pinout, and electrical characteristics remain unchanged. PCB assembly processes accommodate both packaging formats.

Q: Are there any compliance or certification differences?

A: Both parts maintain identical RoHS3 compliance and REACH unaffected status. No additional compliance considerations apply to the substitution.

Q: What is the I2C interface frequency specification?

A: Both parts operate at 400 kHz I2C clock frequency with 3500 ns access time and 4 ms write cycle time.

Q: Is the 8-TSSOP package identical between both parts?

A: Yes. Both parts use the 8-TSSOP package with 0.173" width (4.40 mm). Pinout and footprint are identical.

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