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

Part Overview

The 93C56CT-I/ST is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 8-TSSOP surface mount packaging. This non-volatile memory device operates at 3 MHz clock frequency with 4.5V to 5.5V supply voltage range and -40°C to 85°C operating temperature specification. The part is ROHS3 compliant and carries Active product status. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol compatibility, package form factor, and electrical operating parameters that permit direct functional replacement in circuit applications.

Key Parameters

Parameter	Specification
Memory Size	2Kbit
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 ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 93C56CT-I/ST are classified based on the following substitution criteria:

Primary Substitution Criteria:

Memory capacity: 2Kbit
Memory organization: 256 x 8 or 128 x 16
Package form factor: 8-TSSOP surface mount
Interface protocol: Microwire or 3-Wire Serial
Non-volatile EEPROM technology

Acceptable Parameter Variations:

Clock frequency: 2 MHz to 3 MHz (backward compatible)
Write cycle time: 2ms to 5ms (acceptable for non-real-time applications)
Supply voltage range: Minimum 1.7V to 2.5V (lower bounds acceptable if 5.5V upper limit maintained)
Operating temperature: Extended range acceptable (-40°C to 125°C)

Packaging Variations:

Tape & Reel (TR), Tube, and Cut Tape (CT) packaging formats are functionally equivalent for component selection purposes

Parameter Comparison

Parameter	93C56CT-I/ST	93C56C-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	2ms	2ms	5ms	5ms	5ms
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 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 / Case	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

Direct Equivalent (Packaging Variation): The 93C56C-I/ST is a direct functional equivalent differing only in packaging format (Tube versus Tape & Reel). Both parts share identical electrical specifications, memory organization, and interface protocol. Selection between these variants depends on procurement and assembly process requirements.

Microchip Technology AT93C56B-XHM-T: This part provides functional substitution with interface protocol difference (3-Wire Serial versus Microwire). The AT93C56B-XHM-T operates at reduced clock frequency (2 MHz) and extended write cycle time (5ms). This part is DiGi-Electronics Programmable Verified and maintains identical memory capacity and 8-TSSOP package compatibility. Circuit redesign may be required to accommodate 3-Wire Serial protocol implementation.

STMicroelectronics M93C56-RDW3TP/K: This Microwire-compatible substitute from STMicroelectronics maintains interface protocol alignment with the 93C56CT-I/ST. The M93C56-RDW3TP/K operates at 2 MHz clock frequency and 5ms write cycle time. This part qualifies for automotive applications under AEC-Q100 standard and supports extended operating temperature range to 125°C. Supply voltage minimum is 1.8V, providing broader low-voltage compatibility.

STMicroelectronics M93C56-WDW6TP: This Microwire-compatible substitute maintains full protocol and memory specification alignment. The M93C56-WDW6TP operates at 2 MHz clock frequency with 5ms write cycle time and 2.5V minimum supply voltage. This part offers highest inventory availability and Cut Tape packaging option. Operating temperature range matches the primary part specification (-40°C to 85°C).

Frequently Asked Questions (FAQ)

Q: Can the 93C56C-I/ST replace the 93C56CT-I/ST directly in production?

A: Yes. The 93C56C-I/ST is functionally identical to the 93C56CT-I/ST. The only difference is packaging format (Tube versus Tape & Reel). Both parts carry identical electrical specifications, memory organization, and Microwire interface protocol. Selection depends on assembly line compatibility and procurement logistics.

Q: What is the primary difference between Microwire and 3-Wire Serial interface protocols?

A: Microwire and 3-Wire Serial are distinct serial communication protocols requiring different circuit implementation. The AT93C56B-XHM-T uses 3-Wire Serial protocol, while the 93C56CT-I/ST uses Microwire. Direct substitution requires circuit redesign to accommodate protocol differences. These parts are not pin-compatible for protocol operation.

Q: Are the STMicroelectronics M93C56 parts suitable for automotive applications?

A: The M93C56-RDW3TP/K qualifies for automotive applications under AEC-Q100 standard with extended operating temperature range (-40°C to 125°C). The M93C56-WDW6TP does not carry automotive qualification. Selection depends on application requirements and temperature environment specifications.

Q: What is the impact of reduced clock frequency (2 MHz versus 3 MHz) on system performance?

A: Reduced clock frequency results in slower data transfer rates. The substitute parts operating at 2 MHz provide adequate performance for non-real-time memory access applications. System timing analysis is required to confirm compatibility with application-specific data throughput requirements.

Q: Can parts with different supply voltage ranges be used interchangeably?

A: Parts with overlapping supply voltage ranges are compatible within the overlapping region. The 93C56CT-I/ST operates at 4.5V to 5.5V. Substitute parts with lower minimum voltage specifications (1.7V, 1.8V, or 2.5V) are compatible at 4.5V to 5.5V operation. Parts must maintain 5.5V maximum rating for direct substitution in existing 5V supply circuits.

Q: What packaging formats are available for these 2Kbit EEPROM parts?

A: Available packaging formats include Tape & Reel (TR), Tube, and Cut Tape (CT) with Digi-Reel option. All formats use identical 8-TSSOP surface mount package form factor. Packaging selection depends on assembly equipment compatibility and procurement volume requirements. Functional performance is independent of packaging format.

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