Equivalent & Substitute Parts for 24LC024-I/STG

Part Overview

The 24LC024-I/STG is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 400 kHz clock frequency and 900 ns access time in an 8-TSSOP surface mount package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. Substitute parts must maintain functional compatibility across memory capacity, interface protocol, electrical specifications, and physical packaging.

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	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution logic is based on the following critical parameters that must remain constant or compatible:

Mandatory Equivalence Parameters:

Memory Size: 2Kbit (256 x 8 organization)
Memory Interface: I2C protocol
Package / Case: 8-TSSOP form factor
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Clock Frequency: 400 kHz (minimum) to 1 MHz (higher speeds backward compatible)
Access Time: 900 ns (maximum) to 400 ns (faster access acceptable)
Voltage Supply Range: Minimum 1.7V to 2.5V (lower minimum acceptable); Maximum 5.5V (fixed)
Operating Temperature: -40°C to 85°C (minimum); extended to 125°C acceptable
Product Status: Active preferred over obsolete

Substitute parts are grouped into two categories:

Category 1 - Direct Microchip Equivalents (Same Base Product Family): Parts sharing the 24LC024 or 24AA02/24AA024/24AA025/24AA52 base product numbers with identical memory specifications and I2C interface.

Category 2 - Extended Microchip Variants: Parts with enhanced specifications (higher clock frequency, faster access time, extended temperature range) that maintain full backward compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
24LC024-I/STG	Microchip	2Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
24LC024-I/ST	Microchip	2Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA02-I/ST	Microchip	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA024-I/ST	Microchip	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA024H-I/ST	Microchip	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA025-I/ST	Microchip	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA02H-I/ST	Microchip	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA52-I/ST	Microchip	2Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24LC024-E/ST	Microchip	2Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24LC024H-E/ST	Microchip	2Kbit	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24LC024H-I/ST	Microchip	2Kbit	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Primary Recommendation: 24LC024-I/ST

The 24LC024-I/ST is the direct active equivalent of the obsolete 24LC024-I/STG. It maintains identical electrical specifications, memory organization, interface protocol, and package configuration. The only difference is product status (Active vs. Obsolete) and packaging format (Tube vs. unspecified). This part is verified as DiGi-Electronics Programmable and carries ROHS3 compliance with unlimited moisture sensitivity level.

Secondary Recommendations for Extended Operating Temperature:

The 24LC024-E/ST extends the operating temperature range to -40°C ~ 125°C while maintaining all other specifications of the original part. This variant is suitable for applications requiring enhanced thermal performance and is verified as DiGi-Electronics Programmable.

Secondary Recommendations for Enhanced Speed Performance:

The 24LC024H-I/ST and 24LC024H-E/ST variants provide 1 MHz clock frequency and 400 ns access time, offering improved performance while maintaining backward compatibility with 400 kHz I2C bus operation. The -E variant supports -40°C ~ 125°C operating temperature.

Alternative Microchip Series for Lower Voltage Applications:

The 24AA02-I/ST, 24AA024-I/ST, 24AA024H-I/ST, 24AA025-I/ST, and 24AA02H-I/ST variants support lower minimum supply voltage (1.7V) compared to the original 2.5V specification. These parts are suitable for battery-powered or low-voltage applications while maintaining identical memory capacity and I2C interface.

Alternative for Minimum Supply Voltage of 1.8V:

The 24AA52-I/ST supports 1.8V ~ 5.5V supply range, providing a middle ground between standard 2.5V and extended 1.7V variants.

All recommended substitutes maintain ROHS3 compliance, 8-TSSOP surface mount packaging, and 2Kbit memory organization with I2C interface.

Frequently Asked Questions (FAQ)

Q: Can I use 24AA02-I/ST as a direct replacement for 24LC024-I/STG?

A: Yes. The 24AA02-I/ST is functionally equivalent with identical memory capacity (2Kbit), I2C interface, clock frequency (400 kHz), access time (900 ns), and 8-TSSOP package. The primary difference is the lower minimum supply voltage (1.7V vs. 2.5V), which provides additional design flexibility. Both parts are ROHS3 compliant and surface mount.

Q: What is the difference between 24LC024 and 24AA024 part numbers?

A: The 24LC024 series specifies a minimum supply voltage of 2.5V, while the 24AA024 series supports 1.7V minimum. Both share identical memory specifications (2Kbit, I2C, 400 kHz, 900 ns access time) and 8-TSSOP packaging. Selection depends on the application's power supply requirements.

Q: Can I use 24LC024H-I/ST in place of 24LC024-I/STG?

A: Yes. The 24LC024H-I/ST is a backward-compatible upgrade offering enhanced performance with 1 MHz clock frequency and 400 ns access time. It maintains the same 2Kbit memory, I2C interface, 2.5V ~ 5.5V supply range, and 8-TSSOP package. Faster access time does not create compatibility issues with standard I2C bus operation.

Q: What is the significance of the -E and -I temperature grade designations?

A: The -E designation indicates extended operating temperature range (-40°C ~ 125°C), while -I indicates industrial range (-40°C ~ 85°C). Selection depends on the application's thermal environment. Both variants are otherwise electrically identical.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts listed carry ROHS3 compliance certification, meeting environmental and regulatory requirements equivalent to the original 24LC024-I/STG.

Q: Can I use parts with 1 MHz clock frequency in a 400 kHz I2C bus system?

A: Yes. The 24LC024H variants support 1 MHz operation but are fully backward compatible with 400 kHz I2C bus systems. The device will operate at the bus speed determined by the master controller.

Q: What packaging formats are available for these substitutes?

A: All substitute parts are available in 8-TSSOP surface mount package (0.173", 4.40mm Width). Packaging format (Tube vs. other) may vary by supplier but does not affect electrical or mechanical compatibility.

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