93AA56CT-I/MS EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93AA56CT-I/MS is a 2Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol. This device operates across a wide supply voltage range of 1.8V to 5.5V and is rated for industrial temperature applications from -40°C to 85°C. The component is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent memory capacity, interface protocol, and electrical operating parameters align within acceptable tolerances, enabling direct functional replacement in circuit designs while maintaining performance specifications.

Key Parameters

Parameter	Specification
Memory Type	Non-Volatile EEPROM
Memory Size	2Kbit
Memory Organization	256 x 8, 128 x 16
Memory Interface	Microwire
Clock Frequency	3 MHz
Supply Voltage Range	1.8V ~ 5.5V
Write Cycle Time	6ms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package	8-MSOP (0.118", 3.00mm Width)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93AA56CT-I/MS is determined by the following critical parameters:

Memory Capacity: 2Kbit capacity with 256 x 8 or 128 x 16 organization
Interface Protocol: Microwire serial interface compatibility
Supply Voltage: Operating range must encompass or overlap with 1.8V ~ 5.5V
Temperature Rating: Industrial range -40°C ~ 85°C
Package Type: Surface mount configuration with compatible pinout
Compliance: RoHS3 and REACH compliance status

The M93C56-WDW6TP from STMicroelectronics qualifies as a functional equivalent based on matching memory capacity, Microwire interface, overlapping supply voltage range (2.5V ~ 5.5V), identical temperature rating, and equivalent RoHS3 compliance. Package form factor differs (8-TSSOP vs. 8-MSOP), requiring PCB layout verification for mechanical compatibility.

Parameter Comparison

Parameter	93AA56CT-I/MS (Microchip)	M93C56-WDW6TP (STMicroelectronics)
Memory Type	Non-Volatile EEPROM	Non-Volatile EEPROM
Memory Size	2Kbit	2Kbit
Memory Organization	256 x 8, 128 x 16	256 x 8, 128 x 16
Memory Interface	Microwire	Microwire
Clock Frequency	3 MHz	2 MHz
Supply Voltage Range	1.8V ~ 5.5V	2.5V ~ 5.5V
Write Cycle Time	6ms	5ms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	8-MSOP (0.118", 3.00mm Width)	8-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both the 93AA56CT-I/MS and M93C56-WDW6TP maintain active production status with current manufacturer support and RoHS3 compliance certification. Selection between these devices is based on the following factors:

93AA56CT-I/MS Selection Criteria: Preferred when the 8-MSOP package footprint is already established in PCB layout or when the extended lower voltage operation (1.8V minimum) is required for ultra-low-power applications.

M93C56-WDW6TP Selection Criteria: Applicable when the 8-TSSOP package is compatible with existing board design or when higher inventory availability is a procurement advantage. The 2.5V minimum supply voltage is acceptable for standard industrial applications.

Both devices satisfy identical functional requirements for 2Kbit Microwire EEPROM applications within the -40°C to 85°C operating range. Package selection is the primary differentiator and must be verified against PCB layout constraints and assembly capabilities.

Frequently Asked Questions (FAQ)

Q: Can the M93C56-WDW6TP directly replace the 93AA56CT-I/MS without firmware changes?

A: Yes, from a functional and protocol perspective. Both devices implement identical Microwire interface specifications and 2Kbit memory organization. However, the different package types (8-MSOP vs. 8-TSSOP) require PCB layout modification and assembly process verification.

Q: What is the impact of the 1 MHz clock frequency difference between these parts?

A: The M93C56-WDW6TP operates at 2 MHz maximum clock frequency versus 3 MHz for the 93AA56CT-I/MS. This difference does not affect functional compatibility, as both frequencies support standard Microwire protocol operation. System clock timing must be verified to ensure it does not exceed the substitute part's 2 MHz specification.

Q: Is the 2.5V minimum supply voltage of the M93C56-WDW6TP a limitation?

A: The M93C56-WDW6TP operates from 2.5V to 5.5V, while the 93AA56CT-I/MS extends down to 1.8V. If the application requires operation below 2.5V, the M93C56-WDW6TP is not suitable. For standard industrial applications operating at 3.3V or 5V, this difference is not a constraint.

Q: Are there any differences in write cycle performance?

A: The M93C56-WDW6TP completes write cycles in 5ms compared to 6ms for the 93AA56CT-I/MS. This represents improved performance and does not create compatibility issues.

Q: What package considerations apply when substituting these parts?

A: The 93AA56CT-I/MS uses an 8-MSOP package (0.118" width) while the M93C56-WDW6TP uses an 8-TSSOP package (0.173" width). PCB footprint, solder reflow profile, and pick-and-place equipment compatibility must be evaluated before substitution.

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