24LCS52T/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LCS52T/ST is a 2Kbit I2C EEPROM memory IC manufactured by Microchip Technology, packaged in 8-TSSOP surface mount configuration. This non-volatile memory device operates at 400 kHz I2C clock frequency with 900 ns access time and supports supply voltages from 2.2V to 5.5V across an operating temperature range of 0°C to 70°C. The device is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when design requirements necessitate extended temperature ranges, higher clock frequencies, alternative packaging options, or different manufacturer sourcing while maintaining core functional compatibility.

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	2.2V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 24LCS52T/ST are grouped based on the following substitution criteria:

Core Functional Parameters (Must Match):

Memory Size: 2Kbit
Memory Organization: 256 x 8
Memory Interface: I2C
Memory Format: EEPROM (Non-Volatile)
Package Type: 8-TSSOP
Mounting Type: Surface Mount

Allowed Variation Parameters:

Clock Frequency: 400 kHz or higher (1 MHz acceptable)
Access Time: 900 ns or faster (550 ns acceptable)
Voltage Supply Range: May extend lower or remain within original range
Operating Temperature: May extend beyond 0°C ~ 70°C range
Manufacturer: Microchip Technology or Rohm Semiconductor
Packaging Format: Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel®
RoHS/REACH Compliance: ROHS3 Compliant maintained

Substitutes are valid when all core functional parameters match and allowed variation parameters either match or provide enhanced specifications (higher frequency, faster access time, wider temperature range, extended voltage range).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
24LCS52T/ST	Microchip Technology	2Kbit	400 kHz	900 ns	2.2V ~ 5.5V	0°C ~ 70°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
24AA02T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
34AA02T-E/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
AT24CS02-XHM-T	Microchip Technology	2Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT24HC02C-XHM-T	Microchip Technology	2Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT34C02D-XHM-T	Microchip Technology	2Kbit	1 MHz	Not Specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G02FVT-3AGE2	Rohm Semiconductor	2Kbit	1 MHz	Not Specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24G02FVT-3GE2	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24L02FVT-WE2	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR34E02FVT-3E2	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, confirming ongoing manufacturer support and environmental regulation adherence. Selection between substitutes depends on application-specific requirements:

For Extended Temperature Range Applications: 34AA02T-E/ST extends operating temperature to -40°C ~ 125°C while maintaining 400 kHz I2C operation and 2Kbit capacity.

For Higher Clock Frequency Requirements: AT24CS02-XHM-T, AT24HC02C-XHM-T, and AT34C02D-XHM-T operate at 1 MHz I2C frequency with 550 ns access time, providing faster data transfer capability.

For Lower Supply Voltage Tolerance: 24AA024T-I/ST and 24AA02T-I/ST support 1.7V minimum supply voltage compared to the original 2.2V specification.

For Rohm Semiconductor Sourcing: BR24G02FVT-3AGE2, BR24G02FVT-3GE2, BR24L02FVT-WE2, and BR34E02FVT-3E2 provide equivalent functionality with 8-TSSOP-B packaging variant and extended -40°C ~ 85°C temperature range.

For Packaging Flexibility: Microchip Technology substitutes are available in Tape & Reel (TR) format, while Rohm Semiconductor parts are supplied in Tape & Reel (TR) configuration.

Frequently Asked Questions (FAQ)

Q: Can I substitute 24LCS52T/ST with 24AA02T-I/ST in my design?

A: Yes. Both devices share identical core specifications: 2Kbit EEPROM, 256 x 8 organization, I2C interface at 400 kHz, 900 ns access time, and 8-TSSOP packaging. The 24AA02T-I/ST provides extended operating temperature (-40°C ~ 85°C versus 0°C ~ 70°C) and lower minimum supply voltage (1.7V versus 2.2V), making it functionally compatible and operationally superior for wider environmental conditions.

Q: What is the difference between 400 kHz and 1 MHz I2C clock frequency options?

A: Clock frequency determines I2C bus speed. 400 kHz is the standard I2C speed; 1 MHz (Fast-mode I2C) provides faster data transfer rates. Devices operating at 1 MHz (AT24CS02-XHM-T, AT24HC02C-XHM-T, AT34C02D-XHM-T) are backward compatible with 400 kHz systems but enable higher throughput when the I2C master supports Fast-mode operation. Access time also improves to 550 ns at 1 MHz operation.

Q: Are Rohm Semiconductor parts (BR24G02, BR24L02, BR34E02) pin-compatible with Microchip Technology parts?

A: Yes. All substitute parts maintain 8-TSSOP package configuration with identical pinout. Rohm parts use 8-TSSOP-B variant designation, which maintains mechanical and electrical compatibility. Surface mount placement and PCB footprints are interchangeable.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 indicates the component has unlimited shelf life under standard storage conditions (23°C, 50% relative humidity) without requiring dry-pack storage or baking procedures prior to reflow soldering. All listed substitutes maintain MSL 1 rating except AT34C02D-XHM-T, which specifies MSL 3 (168 hours), requiring controlled moisture exposure management during assembly.

Q: Can I use AT34C02D-XHM-T for applications requiring -40°C ~ 125°C operation?

A: No. AT34C02D-XHM-T operates at -40°C ~ 85°C. For extended high-temperature operation to 125°C, use 34AA02T-E/ST, which is rated -40°C ~ 125°C while maintaining 400 kHz I2C operation and 2Kbit capacity.

Q: What is the minimum supply voltage requirement across all substitutes?

A: The original 24LCS52T/ST requires 2.2V minimum. Microchip Technology substitutes (24AA024T-I/ST, 24AA02T-I/ST, 34AA02T-E/ST, AT24CS02-XHM-T, AT24HC02C-XHM-T, AT34C02D-XHM-T) support 1.7V minimum. Rohm Semiconductor parts support 1.6V ~ 1.8V minimum depending on model. Verify your power supply design accommodates the selected part's minimum voltage specification.

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