AT24HC02B-TH-T Equivalent & Substitute Parts

Part Overview

The AT24HC02B-TH-T is a 2Kbit 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 across an operating temperature range of -40°C to 85°C. The part is packaged in 8-TSSOP surface mount configuration and is ROHS3 compliant with unlimited moisture sensitivity level.

The AT24HC02B-TH-T is currently listed as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Memory Size	2Kbit
Memory Organization	256 x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.8V ~ 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

Substitute Part Grouping Explanation

Substitution of the AT24HC02B-TH-T is determined by the following critical parameters:

Mandatory Matching Parameters:

Memory Size: 2Kbit
Memory Organization: 256 x 8
Memory Interface: I2C
Memory Format: EEPROM
Package Type: 8-TSSOP
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variations:

Clock Frequency: The main part operates at 1 MHz. Substitute parts operating at 400 kHz are functionally compatible as they support the same I2C protocol with reduced maximum speed.
Access Time: The main part specifies 550 ns. Substitute parts with 900 ns access time are acceptable as they remain within typical I2C timing requirements.
Voltage Supply Range: Substitute parts with overlapping or extended voltage ranges (1.7V ~ 5.5V or 1.5V ~ 3.6V) are compatible depending on application requirements.
Operating Temperature: Substitute parts with -40°C ~ 85°C range match the main part. Parts with -20°C ~ 85°C or 0°C ~ 70°C ranges represent narrower specifications.
Product Status: Active status parts are preferred over obsolete parts for new designs.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
AT24HC02B-TH-T	Microchip Technology	2Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
24AA024H-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA52-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA02/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	0°C ~ 70°C	8-TSSOP	Active
24AA024HT-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA024T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA025T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA02HT-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA02T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA52T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24VL024/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.5V ~ 3.6V	-20°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

All substitute parts listed are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1), matching the environmental and regulatory compliance profile of the AT24HC02B-TH-T.

Primary Substitutes (Full Temperature Range -40°C ~ 85°C):

24AA024HT-I/ST: Active status, Tape & Reel packaging, 1.7V ~ 5.5V supply range
24AA024T-I/ST: Active status, Tape & Reel packaging, verified programmable, 1.7V ~ 5.5V supply range
24AA025T-I/ST: Active status, Tape & Reel packaging, 1.7V ~ 5.5V supply range
24AA02HT-I/ST: Active status, Tape & Reel packaging, 1.7V ~ 5.5V supply range
24AA02T-I/ST: Active status, Tape & Reel packaging, verified programmable, 1.7V ~ 5.5V supply range
24AA52T-I/ST: Active status, 1.8V ~ 5.5V supply range
24AA024H-I/ST: Active status, Tube packaging, 1.7V ~ 5.5V supply range
24AA52-I/ST: Active status, Tube packaging, 1.8V ~ 5.5V supply range

Secondary Substitute (Reduced Temperature Range 0°C ~ 70°C):

24AA02/ST: Active status, suitable for applications not requiring full -40°C ~ 85°C range

Low-Voltage Substitute (Reduced Supply Range 1.5V ~ 3.6V):

24VL024/ST: Active status, Tube packaging, suitable for low-voltage applications with reduced temperature range (-20°C ~ 85°C)

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz I2C EEPROM to replace the 1 MHz AT24HC02B-TH-T?

A: Yes. The 400 kHz parts are functionally compatible. The I2C protocol supports multiple clock frequencies, and 400 kHz is a standard I2C speed. The main part's 1 MHz capability is not required for standard I2C communication. Substitute parts will operate correctly in systems designed for the AT24HC02B-TH-T.

Q: What is the difference between 550 ns and 900 ns access time?

A: Access time is the delay from address input to data output availability. The 900 ns specification in substitute parts is slower than the 550 ns of the main part but remains within acceptable I2C timing margins. Both values support standard I2C bus operation.

Q: Are Tape & Reel and Tube packaging interchangeable?

A: Tape & Reel and Tube packaging contain identical die and electrical specifications. The difference is in delivery format. Tape & Reel is standard for automated assembly lines, while Tube packaging is used for manual assembly or lower-volume applications. Select based on your manufacturing process requirements.

Q: Which substitute part should I choose for new designs?

A: For new designs requiring the full -40°C ~ 85°C temperature range with standard I2C operation, select from the primary substitutes with active product status: 24AA024T-I/ST, 24AA02T-I/ST, or 24AA025T-I/ST. These parts offer verified programmability and full temperature range support.

Q: Can I use 24VL024/ST in place of AT24HC02B-TH-T?

A: The 24VL024/ST is compatible only for applications operating within its reduced voltage range (1.5V ~ 3.6V) and temperature range (-20°C ~ 85°C). If your system requires the full 1.8V ~ 5.5V supply range or -40°C operation, use alternative substitutes from the primary list.

Q: What does "verified programmable" mean?

A: Verified programmable indicates that DiGi-Electronics has confirmed the part's programming functionality through testing. Parts marked as "Not Verified" have not undergone this specific verification but remain functionally equivalent based on manufacturer specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity), matching the environmental compliance of the AT24HC02B-TH-T.

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