Microchip Technology 24AA00/ST EEPROM Equivalent & Substitute Parts

Part Overview

The Microchip Technology 24AA00/ST is a 128-bit EEPROM memory IC with I2C interface operating at 400 kHz. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The 24AA00/ST maintains full functional compatibility with its active production variants, differing primarily in packaging configuration and operating temperature range specifications.

Key Parameters

Parameter	Specification
Memory Type	Non-Volatile EEPROM
Memory Size	128 bit
Memory Organization	16 x 8
Interface	I2C
Clock Frequency	400 kHz
Access Time	3500 ns
Write Cycle Time	4 ms
Supply Voltage	1.8V ~ 5.5V
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 of the 24AA00/ST is determined by strict equivalence across core electrical and mechanical parameters. The substitute parts 24AA00-I/ST and 24AA00T-I/ST maintain identical specifications for memory capacity, interface protocol, clock frequency, access timing, voltage range, and physical package dimensions. The primary differentiators are product status (active versus obsolete), packaging format (tube versus tape & reel), and operating temperature range. Both substitute parts are manufactured by Microchip Technology under the same base product number 24AA00, ensuring functional interchangeability at the component level.

Key parameters determining substitution eligibility:

Memory size: 128 bit (fixed)
Memory organization: 16 x 8 (fixed)
I2C interface at 400 kHz (fixed)
8-TSSOP package footprint (fixed)
Supply voltage range: 1.8V ~ 5.5V (fixed)
Access time: 3500 ns (fixed)
Write cycle time: 4 ms (fixed)

Parameter Comparison

Parameter	24AA00/ST (Main)	24AA00-I/ST (Substitute)	24AA00T-I/ST (Substitute)
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Memory Size	128 bit	128 bit	128 bit
Memory Organization	16 x 8	16 x 8	16 x 8
Interface	I2C 400 kHz	I2C 400 kHz	I2C 400 kHz
Access Time	3500 ns	3500 ns	3500 ns
Write Cycle Time	4 ms	4 ms	4 ms
Supply Voltage	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)	8-TSSOP (0.173", 4.40mm Width)	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
Packaging Format	Standard	Tube	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both 24AA00-I/ST and 24AA00T-I/ST are direct functional equivalents to the obsolete 24AA00/ST. Selection between these active alternatives depends on procurement and assembly requirements rather than electrical performance.

The 24AA00-I/ST in tube packaging is suitable for lower-volume applications and manual assembly workflows. The 24AA00T-I/ST in tape & reel format is optimized for high-volume automated pick-and-place assembly operations.

Both substitute parts extend the operating temperature range to -40°C ~ 85°C compared to the original 0°C ~ 70°C specification, providing enhanced thermal performance for demanding environments. All three variants maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Are the 24AA00-I/ST and 24AA00T-I/ST electrically identical to the 24AA00/ST?

A: Yes. All three parts share identical memory capacity (128 bit), interface protocol (I2C 400 kHz), access timing (3500 ns), write cycle time (4 ms), supply voltage range (1.8V ~ 5.5V), and physical package dimensions (8-TSSOP). Electrical performance is equivalent across all variants.

Q: What is the difference between the substitute parts?

A: The 24AA00-I/ST is supplied in tube packaging, while the 24AA00T-I/ST is supplied in tape & reel format. Tube packaging is standard for manual handling and lower-volume orders. Tape & reel packaging is required for automated assembly equipment and high-volume production runs.

Q: Can I use the substitute parts in designs originally specified for the 24AA00/ST?

A: Yes. The substitute parts are direct replacements. The PCB footprint, pin configuration, and electrical interface are identical. No design modifications are required.

Q: Does the extended operating temperature range of the substitutes affect compatibility?

A: No. The extended range (-40°C ~ 85°C versus 0°C ~ 70°C) represents improved capability. Designs operating within the original 0°C ~ 70°C specification will function identically with either substitute part.

Q: Are all three parts RoHS compliant?

A: Yes. The 24AA00/ST, 24AA00-I/ST, and 24AA00T-I/ST are all ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating.

Q: Which substitute should I select for new designs?

A: For new designs, select based on your assembly process. Use 24AA00-I/ST for manual or low-volume assembly. Use 24AA00T-I/ST for automated high-volume production. Both are active products with equivalent electrical specifications.

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