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

Part Overview

The 93LC56CT-I/ST is a 2Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 8-TSSOP surface mount packaging. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent memory capacity, interface compatibility, and electrical operating parameters align within specified tolerances, enabling direct or near-direct replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value
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 ~ 85°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC56CT-I/ST is determined by the following critical parameters:

Primary Substitution Criteria:

Memory capacity: 2Kbit (256 x 8 or 128 x 16 organization)
Serial interface protocol: Microwire or 3-Wire Serial
Package form factor: 8-TSSOP surface mount
Supply voltage compatibility: Minimum 2.5V operation required
Temperature range: Minimum -40°C to 85°C operation

Acceptable Variations:

Clock frequency may differ (2 MHz to 3 MHz acceptable)
Write cycle time may vary (5ms to 6ms acceptable)
Supply voltage upper limit may exceed 5.5V
Operating temperature upper limit may exceed 85°C
Packaging format (Tape & Reel, Tube, Cut Tape) does not affect electrical substitution

Interface Protocol Compatibility: Parts using Microwire protocol are direct substitutes. Parts using 3-Wire Serial protocol are functionally equivalent substitutes with protocol-level compatibility.

Parameter Comparison

Parameter	93LC56CT-I/ST	93LC56C-I/ST	AT93C56B-XHM-T	M93C56-RDW3TP/K	M93C56-WDW6TP
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	STMicroelectronics	STMicroelectronics
Memory Size	2Kbit	2Kbit	2Kbit	2Kbit	2Kbit
Memory Organization	256 x 8, 128 x 16	256 x 8, 128 x 16	256 x 8, 128 x 16	256 x 8, 128 x 16	256 x 8, 128 x 16
Memory Interface	Microwire	Microwire	3-Wire Serial	Microwire	Microwire
Clock Frequency	3 MHz	3 MHz	2 MHz	2 MHz	2 MHz
Write Cycle Time	6ms	6ms	5ms	5ms	5ms
Voltage Supply Range	2.5V ~ 5.5V	2.5V ~ 5.5V	1.7V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Package Type	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

93LC56C-I/ST (Microchip Technology) Direct substitute with identical electrical specifications and Microwire interface. Packaging format differs (Tube vs. Tape & Reel) but does not affect circuit functionality. Recommended for applications requiring exact parameter matching with alternative packaging availability.

AT93C56B-XHM-T (Microchip Technology) Functionally equivalent substitute with 3-Wire Serial interface protocol. Operates at 2 MHz clock frequency and 5ms write cycle time. Supports lower supply voltage minimum (1.7V). DiGi-Electronics Programmable status verified. Suitable for designs where 3-Wire Serial protocol is compatible with existing firmware or hardware interface implementation.

M93C56-RDW3TP/K (STMicroelectronics) Microwire protocol substitute with extended operating temperature range (-40°C to 125°C). Automotive grade qualification with AEC-Q100 certification. Lower supply voltage minimum (1.8V). Recommended for automotive applications or environments requiring extended temperature operation beyond standard -40°C to 85°C range.

M93C56-WDW6TP (STMicroelectronics) Microwire protocol substitute with highest inventory availability (52,330 pcs). Identical supply voltage range (2.5V ~ 5.5V) and operating temperature (-40°C ~ 85°C) to main part. Packaging format (Cut Tape & Digi-Reel) supports flexible procurement. Recommended for high-volume production requirements.

Frequently Asked Questions (FAQ)

Q: Can 93LC56C-I/ST replace 93LC56CT-I/ST in production designs? A: Yes. Both parts share identical electrical specifications, memory capacity, interface protocol, and operating parameters. The only difference is packaging format (Tube vs. Tape & Reel). Circuit functionality remains unchanged.

Q: What is the primary difference between Microwire and 3-Wire Serial interfaces? A: Both are serial communication protocols for EEPROM memory access. Microwire uses dedicated clock and data lines. 3-Wire Serial uses a different signaling scheme. AT93C56B-XHM-T implements 3-Wire Serial protocol and requires compatible firmware or hardware interface logic.

Q: Is M93C56-RDW3TP/K suitable for non-automotive applications? A: Yes. Automotive qualification indicates enhanced reliability and extended temperature range capability. The part functions in standard commercial applications and offers superior temperature performance (-40°C to 125°C vs. -40°C to 85°C).

Q: Does packaging format (Tape & Reel, Tube, Cut Tape) affect electrical performance? A: No. Packaging format affects only procurement, handling, and assembly logistics. Electrical specifications and circuit functionality remain identical across all packaging options.

Q: Which substitute part has the lowest minimum supply voltage? A: AT93C56B-XHM-T supports 1.7V minimum supply voltage, compared to 2.5V for the main part and most substitutes. M93C56-RDW3TP/K supports 1.8V minimum. Both are suitable for low-power applications.

Q: Can I use M93C56-WDW6TP as a direct replacement without design changes? A: Yes. M93C56-WDW6TP maintains identical supply voltage range, operating temperature, Microwire protocol, and 8-TSSOP package. No design modifications are required.

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