24LC512T-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC512T-E/ST is a 512Kbit 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 2.5V to 5.5V across an operating temperature range of -40°C to 125°C. The device is ROHS3 compliant and carries Active product status. Equivalent and substitute parts are identified based on matching memory capacity, I2C interface protocol, package type, and electrical operating parameters to ensure functional interchangeability in circuit applications.

Key Parameters

Parameter	Value
Memory Size	512Kbit
Memory Organization	64K 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 ~ 125°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24LC512T-E/ST is determined by the following critical parameters:

Primary Substitution Criteria:

Memory capacity: 512Kbit (64K x 8 organization)
Interface protocol: I2C serial communication
Package: 8-TSSOP surface mount form factor
Supply voltage compatibility: Minimum 2.5V support required
Operating temperature range: Minimum -40°C to 85°C support required

Secondary Compatibility Factors:

Clock frequency: 400 kHz minimum (higher frequencies are backward compatible)
Access time: 900 ns or faster
Write cycle time: 5ms or faster
RoHS compliance status

Parts meeting all primary criteria are direct functional substitutes. Parts with enhanced specifications (higher clock frequency, faster access time, wider voltage range, extended temperature range) provide superior performance while maintaining full backward compatibility. Parts with restricted specifications or different interface protocols (such as SPI) are not substitutes for I2C applications.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Interface	Clock Freq	Access Time	Write Cycle	Voltage Range	Temp Range	Package	Status
24LC512T-E/ST	Microchip	512Kbit	I2C	400 kHz	900 ns	5ms	2.5V~5.5V	-40°C~125°C	8-TSSOP	Active
24LC512-E/ST	Microchip	512Kbit	I2C	400 kHz	900 ns	5ms	2.5V~5.5V	-40°C~125°C	8-TSSOP	Active
BR24G512FVT-3AGE2	Rohm Semiconductor	512Kbit	I2C	1 MHz	—	5ms	1.7V~5.5V	-40°C~85°C	8-TSSOP	Active
CAT24C512YI-GT3	onsemi	512Kbit	I2C	1 MHz	900 ns	5ms	1.8V~5.5V	-40°C~85°C	8-TSSOP	Active
CAV24C512YE-GT3	onsemi	512Kbit	I2C	1 MHz	900 ns	5ms	2.5V~5.5V	-40°C~125°C	8-TSSOP	Active
M24512-DRDW3TP/K	STMicroelectronics	512Kbit	I2C	1 MHz	450 ns	4ms	1.8V~5.5V	-40°C~125°C	8-TSSOP	Active
M24512-DRDW8TP/K	STMicroelectronics	512Kbit	I2C	1 MHz	450 ns	4ms	1.8V~5.5V	-40°C~105°C	8-TSSOP	Active
M24512-RDW6TP	STMicroelectronics	512Kbit	I2C	1 MHz	500 ns	5ms	1.8V~5.5V	-40°C~85°C	8-TSSOP	Active
M24512-WDW6TP	STMicroelectronics	512Kbit	I2C	1 MHz	500 ns	5ms	2.5V~5.5V	-40°C~85°C	8-TSSOP	Not For New Designs
R1EX24512BTAS0I#S0	Renesas Electronics	512Kbit	I2C	1 MHz	550 ns	5ms	1.8V~5.5V	-40°C~85°C	8-TSSOP	Active

Engineering Selection Recommendations

Direct Equivalent (Identical Specifications): The 24LC512-E/ST from Microchip Technology is a direct equivalent with identical electrical and thermal specifications. This part differs only in packaging format (Tube versus the original specification) and represents the closest functional match.

Enhanced Performance Substitutes (I2C Interface, Active Status): Parts from STMicroelectronics (M24512-DRDW3TP/K, M24512-DRDW8TP/K) and onsemi (CAV24C512YE-GT3) provide superior performance characteristics including faster access times (450 ns), higher clock frequency (1 MHz), and extended temperature range support (-40°C to 125°C). These parts maintain full backward compatibility while offering improved operational margins. M24512-DRDW3TP/K carries automotive-grade AEC-Q100 qualification.

Compatible Substitutes with Operational Constraints: The BR24G512FVT-3AGE2 (Rohm) and CAT24C512YI-GT3 (onsemi) are functionally compatible but operate within a reduced temperature range (-40°C to 85°C). These parts are suitable for applications not requiring the extended 125°C upper temperature limit. The BR24G512FVT-3AGE2 supports lower minimum supply voltage (1.7V).

Not Recommended: The M24512-WDW6TP carries "Not For New Designs" product status and should not be selected for new circuit implementations, despite functional compatibility.

Interface Protocol Note: The M95512-WDW6TP uses SPI interface protocol rather than I2C and is not a substitute for I2C-dependent applications.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with 1 MHz clock frequency in a circuit designed for 400 kHz I2C operation? A: Yes. I2C clock frequency is determined by the master controller, not the slave device. Parts rated for 1 MHz operation are backward compatible with 400 kHz bus speeds. The substitute will operate correctly at the lower frequency.

Q: What is the significance of the temperature range difference between 24LC512T-E/ST (-40°C to 125°C) and CAT24C512YI-GT3 (-40°C to 85°C)? A: The 24LC512T-E/ST supports operation across a wider temperature range. If your application requires operation above 85°C, only parts with extended range (-40°C to 125°C) are suitable. For applications with maximum ambient temperatures below 85°C, both parts are functionally equivalent.

Q: Are automotive-qualified parts (AEC-Q100) required for my application? A: Automotive qualification is specified in the part datasheet and is required only if your application demands it. The M24512-DRDW3TP/K and CAV24C512YE-GT3 carry AEC-Q100 qualification. Standard industrial-grade parts are suitable for non-automotive applications.

Q: What does "Not For New Designs" status mean for the M24512-WDW6TP? A: This designation indicates the manufacturer is discontinuing the part and recommends against its use in new circuit designs. While existing inventory may be available, alternative parts should be selected for new projects to ensure long-term supply availability.

Q: Can I substitute an SPI EEPROM (M95512-WDW6TP) for the I2C 24LC512T-E/ST? A: No. The M95512-WDW6TP uses SPI serial protocol, which is electrically and functionally incompatible with I2C. The communication protocols, pin configurations, and command structures differ fundamentally. Only I2C-interface parts are substitutes.

Q: How do I verify pin compatibility between the main part and substitute? A: All listed substitutes use the 8-TSSOP package with identical pinout for I2C EEPROM devices. Pin assignments for SDA, SCL, VSS, and VCC are standardized across manufacturers. Consult individual datasheets to confirm specific pin assignments for your selected part.

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