93C56C-E/ST EEPROM Equivalent & Substitute Parts

Part Overview

The 93C56C-E/ST is a 2Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol. This component is designed for applications requiring persistent data storage with low power consumption and high reliability. The device operates at 3 MHz clock frequency with a 4.5V to 5.5V supply voltage range and is housed in an 8-TSSOP surface mount package.

The 93C56C-E/ST maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified based on matching memory capacity, interface protocol, package form factor, and operating temperature range compatibility.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the 93C56C-E/ST are qualified based on the following critical parameters:

Memory capacity: 2Kbit (256 x 8 or 128 x 16 organization)
Interface protocol: Microwire serial interface
Package form factor: 8-TSSOP surface mount
Supply voltage compatibility: Minimum voltage support for 4.5V ~ 5.5V range
Operating temperature range: Support for -40°C minimum and 125°C maximum
Non-volatile EEPROM technology

The identified substitutes maintain functional equivalence within these constraints. Variations in clock frequency, write cycle time, and extended voltage ranges do not preclude substitution when the primary operating parameters align with the original specification.

Parameter Comparison

Parameter	93C56C-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
Write Cycle Time	2ms	5ms	5ms
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
Package Type	8-TSSOP	8-TSSOP	8-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

Both STMicroelectronics substitutes maintain full compatibility with the 93C56C-E/ST within the specified operating envelope:

M93C56-RDW3TP/K is qualified to AEC-Q100 automotive standards and supports extended supply voltage range (1.8V ~ 5.5V) with full temperature range coverage (-40°C ~ 125°C). This part is suitable for applications requiring automotive-grade reliability and broader voltage tolerance.

M93C56-WDW6TP provides the highest inventory availability and operates across 2.5V ~ 5.5V supply range. The operating temperature maximum is limited to 85°C, which restricts use in applications requiring the full 125°C upper temperature specification of the original part.

Both substitutes are RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1), matching the environmental compliance profile of the 93C56C-E/ST. All three parts maintain Active product status with no planned obsolescence.

Frequently Asked Questions (FAQ)

Q: Can M93C56-WDW6TP replace 93C56C-E/ST in all applications?

A: M93C56-WDW6TP is functionally equivalent for applications operating within -40°C to 85°C temperature range. Applications requiring operation above 85°C must use 93C56C-E/ST or M93C56-RDW3TP/K.

Q: What is the impact of different clock frequencies (3 MHz vs 2 MHz)?

A: The 93C56C-E/ST operates at 3 MHz while both STMicroelectronics substitutes operate at 2 MHz. This represents a reduction in maximum serial communication speed. Applications with timing-critical Microwire protocol requirements must account for this difference in data transfer rates.

Q: Are the 8-TSSOP packages physically identical?

A: All three parts use 8-TSSOP packages with identical 0.173" (4.40mm) width specification. PCB footprints and reflow profiles are compatible across all three parts.

Q: What is the significance of the voltage supply range differences?

A: The 93C56C-E/ST requires 4.5V ~ 5.5V supply. M93C56-RDW3TP/K extends the lower limit to 1.8V, while M93C56-WDW6TP extends to 2.5V. Both substitutes operate correctly within the original 4.5V ~ 5.5V range. Extended voltage support in substitutes does not affect compatibility.

Q: How do write cycle times affect system design?

A: The 93C56C-E/ST specifies 2ms write cycle time, while both substitutes specify 5ms. Applications with sequential write operations must account for the longer cycle time in M93C56 variants when calculating total programming duration.

Q: Are all three parts RoHS3 compliant?

A: Yes. The 93C56C-E/ST, M93C56-RDW3TP/K, and M93C56-WDW6TP are all RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

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