Equivalent & Substitute Parts for 93LC56AX/SN

Part Overview

The Microchip Technology 93LC56AX/SN is a 2Kbit EEPROM memory IC utilizing Microwire serial interface protocol. This component operates at 2 MHz clock frequency with 256 x 8 memory organization and is packaged in 8-SOIC surface mount configuration. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design support and production continuity. Substitute parts must maintain functional compatibility across memory capacity, interface protocol, and electrical operating parameters.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	2Kbit
Memory Organization	256 x 8
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	6ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC56AX/SN is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Memory Size: 2Kbit (256 x 8 organization)
Memory Interface: Microwire serial protocol
Clock Frequency: 2 MHz
Package: 8-SOIC surface mount
Write Cycle Time: 6ms
Voltage Supply Range: Minimum 2.5V ~ 5.5V compatibility

Secondary Compatibility Factors:

Operating Temperature Range: Extended ranges acceptable if minimum 0°C and maximum ≥70°C
Product Status: Active status preferred for long-term availability
RoHS Compliance: ROHS3 Compliant required
Moisture Sensitivity: MSL 1 (Unlimited) required

Substitute parts are grouped into two categories:

Category A - Direct Microwire 2Kbit Equivalents (93LC56 Series): Parts maintaining identical memory capacity, Microwire interface, and 8-SOIC packaging. These include 93LC56A/SN, 93LC56A-I/SN, 93LC56A-E/SN, 93LC56AX-I/SN, and 93LC56AX-E/SN. All parts share the 93LC56 base product number and are fully compatible at the functional level.

Category B - Extended Supply Voltage Equivalents (93AA56 Series): Parts offering expanded voltage supply range (1.8V ~ 5.5V) while maintaining 2Kbit capacity, Microwire interface, and 8-SOIC packaging. These include 93AA56A-I/SN and 93AA56AX-I/SN. These parts provide broader voltage compatibility but operate under the same memory and interface specifications.

Non-Equivalent Part: AT93C46DN-SH-B is listed in the original substitute field but does not qualify as a functional substitute. This part operates with 3-Wire Serial interface (not Microwire) and contains 1Kbit memory capacity (not 2Kbit), making it incompatible with 93LC56AX/SN applications.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Memory Interface	Clock Frequency	Write Cycle Time	Voltage Supply	Operating Temperature	Product Status	Package
93LC56AX/SN	Microchip	2Kbit	Microwire	2 MHz	6ms	2.5V ~ 5.5V	0°C ~ 70°C	Obsolete	8-SOIC
93AA56A-I/SN	Microchip	2Kbit	Microwire	2 MHz	6ms	1.8V ~ 5.5V	-40°C ~ 85°C	Active	8-SOIC
93AA56AX-I/SN	Microchip	2Kbit	Microwire	2 MHz	6ms	1.8V ~ 5.5V	-40°C ~ 85°C	Active	8-SOIC
93LC56A-E/SN	Microchip	2Kbit	Microwire	2 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 125°C	Active	8-SOIC
93LC56A-I/SN	Microchip	2Kbit	Microwire	2 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 85°C	Active	8-SOIC
93LC56A/SN	Microchip	2Kbit	Microwire	2 MHz	6ms	2.5V ~ 5.5V	0°C ~ 70°C	Active	8-SOIC
93LC56AX-E/SN	Microchip	2Kbit	Microwire	2 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 125°C	Active	8-SOIC
93LC56AX-I/SN	Microchip	2Kbit	Microwire	2 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 85°C	Active	8-SOIC

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement:

For applications requiring direct functional replacement of the obsolete 93LC56AX/SN, select 93LC56A/SN or 93LC56AX-I/SN. Both parts maintain identical electrical specifications (2.5V ~ 5.5V supply, 2Kbit Microwire EEPROM, 8-SOIC package) and are classified as active products. The 93LC56A/SN offers the closest operating temperature match (0°C ~ 70°C) to the original part. The 93LC56AX-I/SN provides extended temperature operation (-40°C ~ 85°C) for applications requiring broader thermal performance. Both parts are ROHS3 compliant and carry MSL 1 rating.

Extended Temperature Applications:

For designs requiring operation beyond the original 0°C ~ 70°C range, 93LC56A-E/SN or 93LC56AX-E/SN provide extended temperature capability to -40°C ~ 125°C while maintaining all other electrical and functional parameters. These parts are suitable for industrial and automotive applications with demanding thermal requirements.

Expanded Voltage Supply Applications:

For applications operating at supply voltages below 2.5V, 93AA56A-I/SN or 93AA56AX-I/SN provide expanded voltage range (1.8V ~ 5.5V) while maintaining 2Kbit Microwire EEPROM functionality. These parts are active products with extended temperature operation (-40°C ~ 85°C) and are ROHS3 compliant.

Compliance and Availability:

All recommended substitute parts are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity rating, and are classified as active products. Current inventory levels support production requirements across all substitute options.

Frequently Asked Questions (FAQ)

Q: Can 93LC56AX/SN be directly replaced with 93AA56A-I/SN?

A: Yes, with voltage supply considerations. Both parts contain 2Kbit Microwire EEPROM in 8-SOIC packaging with identical 2 MHz clock frequency and 6ms write cycle time. The 93AA56A-I/SN provides expanded voltage supply range (1.8V ~ 5.5V) compared to the original part (2.5V ~ 5.5V). If your application operates at supply voltages ≥2.5V, this substitution is functionally equivalent. If operation below 2.5V is required, the 93AA56A-I/SN is necessary.

Q: What is the difference between 93LC56A-I/SN and 93LC56AX-I/SN?

A: Both parts are functionally identical 2Kbit Microwire EEPROM devices in 8-SOIC packaging with 2.5V ~ 5.5V supply range and 2 MHz operation. The primary difference is the DiGi-Electronics Programmable verification status: 93LC56A-I/SN is verified, while 93LC56AX-I/SN is not verified. Both are active products with -40°C ~ 85°C operating temperature range. Selection between these parts depends on programmability verification requirements for your application.

Q: Is AT93C46DN-SH-B a suitable substitute for 93LC56AX/SN?

A: No. AT93C46DN-SH-B is not a functional substitute. This part contains 1Kbit memory capacity (not 2Kbit) and uses 3-Wire Serial interface (not Microwire). These fundamental differences in memory capacity and interface protocol make this part incompatible with 93LC56AX/SN applications.

Q: What are the temperature range options for 93LC56 series substitutes?

A: Three temperature ranges are available: Standard (0°C ~ 70°C) in 93LC56A/SN, Industrial (-40°C ~ 85°C) in 93LC56A-I/SN and 93LC56AX-I/SN, and Extended (-40°C ~ 125°C) in 93LC56A-E/SN and 93LC56AX-E/SN. Select based on your application's thermal operating requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and reliability standards.

Q: Can I use 93AA56AX-I/SN in a design originally specified for 93LC56AX/SN?

A: Yes. The 93AA56AX-I/SN maintains 2Kbit Microwire EEPROM functionality, 2 MHz clock frequency, 6ms write cycle time, and 8-SOIC packaging. The expanded voltage supply range (1.8V ~ 5.5V) is backward compatible with the original 2.5V ~ 5.5V specification. Extended operating temperature (-40°C ~ 85°C) provides additional thermal margin. This substitution is functionally equivalent and offers improved specifications.

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