AT24C02BY6-YH-T Equivalent & Substitute Parts

Part Overview

The AT24C02BY6-YH-T is a 2Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This part operates at 1 MHz clock frequency with 550 ns access time and supports a supply voltage range of 1.8V to 5.5V. The device is packaged in an 8-Mini Map (2x3) form factor and is currently classified as obsolete. Due to its obsolete status, identifying functionally equivalent and compatible substitute parts is essential for ongoing design support, production continuity, and component sourcing.

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	5ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UFDFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AT24C02BY6-YH-T is determined by the following critical parameters:

Core Functional Requirements:

Memory capacity: 2Kbit
Memory organization: 256 x 8
Interface protocol: I2C
Supply voltage compatibility: Must support the application's operating voltage range
Operating temperature range: Must meet or exceed -40°C to 85°C minimum
Package compatibility: Physical dimensions and pin configuration must match or be compatible with PCB layout

Acceptable Variation Parameters:

Clock frequency: 400 kHz or 1 MHz operation acceptable (lower frequency maintains backward compatibility)
Access time: Faster access times (400 ns or lower) are acceptable substitutes
Write cycle time: Faster write cycles (1ms or 5ms) are acceptable
Packaging format: Alternative DFN, TDFN, UDFN, or VSON packages with identical pin counts and exposed pad configurations are acceptable

Substitute parts must maintain I2C protocol compatibility, identical memory capacity and organization, and surface mount capability. All listed substitutes meet these core requirements while offering active product status and improved availability.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Write Cycle Time	Voltage Supply	Operating Temp	Package	Product Status
AT24C02BY6-YH-T	Microchip Technology	2Kbit	1 MHz	550 ns	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-UFDFN	Obsolete
24AA52T-I/MC	Microchip Technology	2Kbit	400 kHz	900 ns	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-VFDFN	Active
24AA02T-I/MNY	Microchip Technology	2Kbit	400 kHz	900 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-WFDFN	Active
24C02CT-I/MNY	Microchip Technology	2Kbit	400 kHz	900 ns	1ms	4.5V ~ 5.5V	-40°C ~ 85°C	8-WFDFN	Active
34LC02T-E/MNY	Microchip Technology	2Kbit	1 MHz	400 ns	5ms	2.2V ~ 5.5V	-40°C ~ 125°C	8-WFDFN	Active
34LC02T-I/MNY	Microchip Technology	2Kbit	1 MHz	400 ns	5ms	2.2V ~ 5.5V	-40°C ~ 85°C	8-WFDFN	Active
AT24CS02-MAHM-E	Microchip Technology	2Kbit	1 MHz	550 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-UFDFN	Active
AT24CS02-MAHM-T	Microchip Technology	2Kbit	1 MHz	550 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-UFDFN	Active
AT34C02D-MAHM-T	Microchip Technology	2Kbit	1 MHz	Not Specified	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-UFDFN	Active
BR24G02NUX-3ATTR	Rohm Semiconductor	2Kbit	1 MHz	Not Specified	5ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-UFDFN	Active
BR24G02NUX-3TTR	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	5ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-UFDFN	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

AT24CS02-MAHM-T and AT24CS02-MAHM-E are the closest functional equivalents to the AT24C02BY6-YH-T. Both maintain identical memory capacity, I2C interface, 1 MHz clock frequency, 550 ns access time, and 5ms write cycle time. These parts are manufactured by Microchip Technology and carry active product status with ROHS3 compliance. The AT24CS02-MAHM-T is available in Tape & Reel packaging with significantly higher inventory (24,759 pcs), making it the preferred choice for production environments.

AT34C02D-MAHM-T offers equivalent performance with the same 1 MHz operation and 8-UFDFN package. This part demonstrates exceptional availability with 500,100 pcs in stock and maintains full ROHS3 compliance and active product status.

Secondary Substitutes (1 MHz Operation):

34LC02T-I/MNY and 34LC02T-E/MNY provide 1 MHz clock frequency matching the original part. Both feature improved access time (400 ns versus 550 ns) and maintain 5ms write cycle time. The 34LC02T-E/MNY extends operating temperature to -40°C to 125°C, offering enhanced thermal performance. Both parts carry active status and ROHS3 compliance.

BR24G02NUX-3ATTR from Rohm Semiconductor operates at 1 MHz with 1.6V to 5.5V supply range and active product status. This cross-manufacturer option provides design flexibility while maintaining core functional requirements.

Alternative Substitutes (400 kHz Operation):

24AA02T-I/MNY, 24AA52T-I/MC, and BR24G02NUX-3TTR operate at 400 kHz, which is acceptable for applications not requiring 1 MHz performance. These parts maintain 2Kbit capacity, I2C interface, and active product status. The 24AA02T-I/MNY offers the highest inventory availability (1,757 pcs) among 400 kHz options.

24C02CT-I/MNY is suitable only for applications with 4.5V to 5.5V supply requirements, as its minimum voltage specification is higher than the original part.

All recommended substitutes maintain ROHS3 compliance, I2C protocol compatibility, and surface mount capability. Selection should prioritize active product status and inventory availability for production continuity.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz EEPROM as a substitute for the 1 MHz AT24C02BY6-YH-T?

A: Yes, if your application does not require 1 MHz operation. The 400 kHz parts (24AA02T-I/MNY, 24AA52T-I/MC, BR24G02NUX-3TTR) maintain identical memory capacity, I2C protocol, and electrical compatibility. However, verify that your system's I2C bus timing does not depend on the higher clock frequency. Lower clock frequency operation is backward compatible with 1 MHz-capable controllers.

Q: What is the difference between the various Microchip 2Kbit EEPROM packages?

A: The AT24C02BY6-YH-T uses an 8-Mini Map (2x3) package. Substitute parts use alternative 8-pin packages: VFDFN, WFDFN, TDFN, and UFDFN. All are 8-pin surface mount packages with exposed pads and identical pin configurations. Physical dimensions vary slightly, so verify PCB footprint compatibility before design implementation. The UFDFN package (used by AT24CS02-MAHM-T and AT34C02D-MAHM-T) is the closest physical match to the original Mini Map package.

Q: Are Rohm Semiconductor BR24G02 parts fully compatible with Microchip AT24C02 designs?

A: Yes. Both BR24G02NUX-3ATTR and BR24G02NUX-3TTR maintain I2C protocol compatibility, identical memory organization (256 x 8), and pin-compatible 8-UFDFN packages. The primary difference is manufacturer. Verify that your design does not include manufacturer-specific features or firmware dependencies before substitution.

Q: Why does 24C02CT-I/MNY have a narrower voltage range (4.5V to 5.5V)?

A: The 24C02CT-I/MNY is optimized for 5V-only applications and does not support lower voltage operation. Use this part only if your system operates exclusively at 5V. For designs requiring 1.7V to 5.5V or 1.8V to 5.5V operation, select AT24CS02-MAHM-T, 24AA02T-I/MNY, or 34LC02T-I/MNY instead.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating difference?

A: The original AT24C02BY6-YH-T carries MSL 1 (unlimited shelf life). Most substitutes carry MSL 3 (168 hours), which requires controlled storage conditions and baking procedures before reflow soldering. Verify your manufacturing process can accommodate MSL 3 requirements. AT24CS02-MAHM-T and BR24G02 parts also carry MSL 3, while 24AA02T-I/MNY and 24AA52T-I/MC maintain MSL 1.

Q: Can I substitute the AT24C02BY6-YH-T with a higher-capacity EEPROM like a 4Kbit or 8Kbit device?

A: No. Higher-capacity devices have different memory organization and I2C addressing schemes. The AT24C02BY6-YH-T is specifically a 2Kbit device with 256 x 8 organization. Substitution requires identical memory capacity and organization to maintain firmware and hardware compatibility.

Q: Which substitute offers the best long-term availability?

A: AT34C02D-MAHM-T demonstrates exceptional availability with 500,100 pcs in stock and active product status. AT24CS02-MAHM-T is also highly available with 24,759 pcs. Both are manufactured by Microchip Technology and carry active product designations, indicating long-term production support.

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