93C56CT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C56CT-E/ST is a 2Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, featuring Microwire serial interface protocol. This non-volatile memory device is designed for applications requiring persistent data storage with serial communication capabilities. The part is currently in active production status with 829 units available in stock.

Substitute parts are identified when equivalent memory capacity, interface protocol, package type, and electrical operating ranges align with the original specification, enabling direct replacement in circuit designs without functional compromise.

Key Parameters

Parameter	Value
Memory Size	2Kbit
Memory Format	EEPROM
Memory Organization	256 x 8, 128 x 16
Memory Interface	Microwire
Clock Frequency	3 MHz
Package Type	8-TSSOP (0.173", 4.40mm Width)
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Write Cycle Time	2ms
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93C56CT-E/ST is determined by the following critical parameters:

Core Compatibility Requirements:

Memory capacity: 2Kbit
Memory format: EEPROM technology
Serial interface: Microwire protocol
Package: 8-TSSOP form factor with matching pin configuration
Mounting: Surface mount technology

Operational Compatibility Criteria:

Supply voltage range must encompass or overlap with 4.5V ~ 5.5V
Operating temperature range must support -40°C ~ 125°C minimum
Clock frequency of 2 MHz or higher supports 3 MHz operation
Write cycle time specifications must be compatible with application timing requirements

The identified substitute parts meet these core requirements while maintaining functional equivalence for standard EEPROM memory applications utilizing Microwire serial communication.

Parameter Comparison

Parameter	93C56CT-E/ST (Microchip)	M93C56-RDW3TP/K (STMicroelectronics)	M93C56-WDW6TP (STMicroelectronics)
Memory Size	2Kbit	2Kbit	2Kbit
Memory Format	EEPROM	EEPROM	EEPROM
Memory Organization	256 x 8, 128 x 16	256 x 8, 128 x 16	256 x 8, 128 x 16
Memory Interface	Microwire	Microwire	Microwire
Clock Frequency	3 MHz	2 MHz	2 MHz
Package Type	8-TSSOP	8-TSSOP	8-TSSOP
Voltage Supply Range	4.5V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Write Cycle Time	2ms	5ms	5ms
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

M93C56-RDW3TP/K Selection Criteria: This STMicroelectronics part maintains full compatibility with the 93C56CT-E/ST across all critical parameters. The extended supply voltage range (1.8V ~ 5.5V) provides additional design flexibility. The part carries AEC-Q100 automotive qualification, indicating enhanced reliability screening. Operating temperature range matches the original specification at -40°C ~ 125°C. Write cycle time of 5ms is longer than the original 2ms specification and must be evaluated against application timing constraints.

M93C56-WDW6TP Selection Criteria: This STMicroelectronics alternative provides the highest inventory availability (52,330 units) and operates across a 2.5V ~ 5.5V supply range. The operating temperature range is limited to -40°C ~ 85°C, which is narrower than the original specification and restricts use in applications requiring the full -40°C ~ 125°C range. Write cycle time of 5ms requires application-level timing validation. This part is suitable for standard industrial temperature applications.

Both substitute parts maintain ROHS3 compliance and identical 8-TSSOP packaging, ensuring mechanical and environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can M93C56-RDW3TP/K directly replace 93C56CT-E/ST in all applications? A: Direct replacement is possible for applications where write cycle time of 5ms is acceptable. The extended supply voltage range and matching operating temperature range support equivalent functionality. Applications with strict timing requirements below 5ms write cycle time require design review.

Q: What is the impact of the narrower operating temperature range in M93C56-WDW6TP? A: The M93C56-WDW6TP operates only to -40°C ~ 85°C, compared to the original -40°C ~ 125°C specification. This part is unsuitable for applications requiring operation above 85°C. Verify application temperature requirements before selection.

Q: Are the supply voltage ranges compatible? A: The 93C56CT-E/ST requires 4.5V ~ 5.5V. M93C56-RDW3TP/K supports 1.8V ~ 5.5V, providing broader compatibility. M93C56-WDW6TP supports 2.5V ~ 5.5V. Both substitute parts operate within the original specification range, though the substitutes offer extended lower voltage capability.

Q: How does the 2 MHz clock frequency in substitute parts affect 3 MHz operation? A: The substitute parts specify 2 MHz maximum clock frequency, while the original operates at 3 MHz. In applications using 3 MHz clock rates, the substitute parts may not meet timing specifications. Applications using clock frequencies at or below 2 MHz are compatible.

Q: What packaging considerations apply to these substitutes? A: All three parts use identical 8-TSSOP packaging (0.173", 4.40mm width) with surface mount technology. Pin-to-pin compatibility is maintained, allowing direct PCB footprint reuse without layout modifications.

Q: Does AEC-Q100 qualification on M93C56-RDW3TP/K provide additional assurance? A: AEC-Q100 qualification indicates the part has undergone automotive-grade reliability screening and testing. This certification is relevant for applications requiring enhanced reliability documentation, though both substitute parts maintain ROHS3 compliance and equivalent functional specifications.

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