24AA256T-E/SM EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24AA256T-E/SM is a 256Kbit I2C EEPROM memory integrated circuit manufactured by Microchip Technology. This non-volatile memory device operates across a wide supply voltage range of 1.7V to 5.5V and supports industrial temperature ranges from -40°C to 125°C. The device is actively produced and ROHS3 compliant, making it suitable for embedded systems, data logging, and configuration storage applications. Substitute parts may be required due to inventory constraints, regional availability, or specific application requirements that demand alternative electrical or thermal characteristics.

Substiute Parts

24AA256T-E/SM

Microchip TechnologyIn Stock: 104124AA256T-E/SM Datasheet

Current PartRFQ

M24256-DRMN8TP/K

STMicroelectronicsIn Stock: 24313M24256-DRMN8TP/K Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The M24256-DRMN8TP/K from STMicroelectronics qualifies as a functional substitute for the 24AA256T-E/SM based on the following critical parameters:

Matching Parameters:

• Memory capacity: 256Kbit (32K x 8 organization)
• Memory interface: I2C protocol
• Write cycle time: 5ms
• Package type: 8-SOIC surface mount
• RoHS3 compliance
• Non-volatile EEPROM technology

Differing Parameters:

• Clock frequency: 1 MHz (vs. 400 kHz main part)
• Access time: 450 ns (vs. 900 ns main part)
• Supply voltage range: 1.8V ~ 5.5V (vs. 1.7V ~ 5.5V main part)
• Operating temperature: -40°C ~ 105°C (vs. -40°C ~ 125°C main part)
• Automotive qualification: AEC-Q100 certified

The substitute part offers improved performance characteristics with faster clock frequency and access time, making it suitable for applications where the main part specifications are met or exceeded.

Parameter Comparison

Engineering Selection Recommendations

Both the 24AA256T-E/SM and M24256-DRMN8TP/K are active production devices with ROHS3 compliance. The M24256-DRMN8TP/K includes AEC-Q100 automotive qualification, making it suitable for automotive and high-reliability applications. Selection between these parts should be based on specific application requirements:

• Use the 24AA256T-E/SM when the extended temperature range to 125°C is required or when the lower minimum supply voltage of 1.7V is necessary.
• Use the M24256-DRMN8TP/K when faster I2C clock frequency (1 MHz) and reduced access time (450 ns) are beneficial, or when automotive-grade qualification is required.
• Both parts are pin-compatible in 8-SOIC packages, though physical dimensions differ slightly (5.30mm vs. 3.90mm width).

Frequently Asked Questions (FAQ)

Q: Are these parts pin-compatible? A: Yes, both the 24AA256T-E/SM and M24256-DRMN8TP/K use the 8-SOIC package with identical pin assignments for I2C EEPROM operation. Physical package dimensions differ slightly, which may affect PCB layout considerations.

Q: What is the primary difference between these parts? A: The M24256-DRMN8TP/K operates at a higher I2C clock frequency (1 MHz vs. 400 kHz) with faster access time (450 ns vs. 900 ns). The 24AA256T-E/SM supports a lower minimum supply voltage (1.7V vs. 1.8V) and higher maximum operating temperature (125°C vs. 105°C).

Q: Can I use the M24256-DRMN8TP/K in place of the 24AA256T-E/SM? A: The M24256-DRMN8TP/K can substitute the 24AA256T-E/SM in applications where the operating temperature does not exceed 105°C and the minimum supply voltage is 1.8V or higher. The substitute part's improved performance characteristics make it suitable for most standard applications.

Q: What does AEC-Q100 qualification mean? A: AEC-Q100 is an automotive industry qualification standard. The M24256-DRMN8TP/K meets this standard, making it suitable for automotive applications requiring enhanced reliability and quality assurance.

Q: Are both parts RoHS compliant? A: Yes, both the 24AA256T-E/SM and M24256-DRMN8TP/K are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for commercial and industrial applications.

Q: What is the significance of the different package widths (5.30mm vs. 3.90mm)? A: The package width difference reflects different manufacturing processes between Microchip and STMicroelectronics. Both are standard 8-SOIC packages; however, PCB footprints and placement considerations may differ slightly. Verify PCB design compatibility before substitution.