93LC56CT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC56CT-E/ST is a 2Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for non-volatile data storage applications requiring Microwire serial interface communication. This device operates across a wide supply voltage range of 2.5V to 5.5V and supports industrial temperature ranges from -40°C to 125°C. The component is currently in active production status and widely available in inventory. Substitute parts are identified when equivalent electrical specifications, memory capacity, interface protocol, and physical packaging are maintained across alternative manufacturers or product variants.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	2Kbit
Memory Organization	256 x 8, 128 x 16
Memory Interface	Microwire
Clock Frequency	3 MHz
Write Cycle Time	6ms
Voltage Supply Range	2.5V ~ 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 93LC56CT-E/ST are qualified based on the following critical parameters that must remain equivalent:

Memory capacity: 2Kbit
Memory organization: 256 x 8 or 128 x 16 configuration
Serial interface protocol: Microwire
Physical package: 8-TSSOP form factor with 0.173" width and 4.40mm dimensions
Supply voltage compatibility: Minimum 2.5V operation required
Operating temperature range: Support for -40°C to 125°C
Non-volatile EEPROM technology
Surface mount mounting type
RoHS3 compliance

The identified substitute parts maintain these core electrical and mechanical specifications, ensuring functional interchangeability within the same application circuit topology.

Parameter Comparison

Parameter	93LC56CT-E/ST (Microchip)	M93C56-RDW3TP/K (STMicroelectronics)	M93C56-WDW6TP (STMicroelectronics)
Memory Type	Non-Volatile EEPROM	Non-Volatile EEPROM	Non-Volatile EEPROM
Memory Size	2Kbit	2Kbit	2Kbit
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	6ms	5ms	5ms
Voltage Supply Range	2.5V ~ 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

Engineering Selection Recommendations

Both M93C56-RDW3TP/K and M93C56-WDW6TP from STMicroelectronics are qualified substitutes for the 93LC56CT-E/ST. Selection between these alternatives depends on specific application requirements:

The M93C56-RDW3TP/K carries AEC-Q100 automotive qualification and supports extended supply voltage operation down to 1.8V, making it suitable for automotive-grade applications and systems with lower voltage rails. This part maintains the full industrial temperature range of -40°C to 125°C.

The M93C56-WDW6TP is available in higher inventory quantities and operates across the standard 2.5V to 5.5V supply range. This part is rated for -40°C to 85°C operating temperature, which is suitable for applications not requiring the extended upper temperature limit of 125°C.

All three parts maintain ROHS3 compliance, identical memory capacity and organization, Microwire interface protocol, and 8-TSSOP packaging. The primary differentiators are clock frequency (3 MHz versus 2 MHz), write cycle time (6ms versus 5ms), temperature range, and automotive qualification status.

Frequently Asked Questions (FAQ)

Q: Can M93C56-RDW3TP/K replace 93LC56CT-E/ST in all applications?

A: M93C56-RDW3TP/K is functionally equivalent for applications operating within -40°C to 125°C temperature range and 2.5V to 5.5V supply voltage. The lower clock frequency (2 MHz versus 3 MHz) and faster write cycle time (5ms versus 6ms) do not prevent substitution. The extended lower voltage support (1.8V) provides additional design flexibility.

Q: What is the temperature limitation of M93C56-WDW6TP?

A: M93C56-WDW6TP operates from -40°C to 85°C. Applications requiring operation above 85°C must use 93LC56CT-E/ST or M93C56-RDW3TP/K, which support up to 125°C.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use identical 8-TSSOP packaging with 0.173" width and 4.40mm dimensions, ensuring direct PCB footprint compatibility.

Q: Does the 2 MHz clock frequency of STMicroelectronics parts affect system performance?

A: The 2 MHz clock frequency is lower than the 3 MHz specification of the Microchip part. System designs must accommodate this lower maximum clock speed. The faster write cycle time (5ms versus 6ms) partially offsets this difference.

Q: Which substitute part is recommended for automotive applications?

A: M93C56-RDW3TP/K carries AEC-Q100 automotive qualification and is the appropriate selection for automotive-grade system requirements.

Q: Are all parts RoHS compliant?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.

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