93LC56AXT/SN EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC56AXT/SN is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 8-SOIC surface mount packaging. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement continuity. The device operates across a 2.5V to 5.5V supply voltage range with a 2 MHz clock frequency, suitable for embedded systems requiring non-volatile memory storage in compact form factors.

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 / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 93LC56AXT/SN is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Memory Size: 2Kbit (256 x 8 organization)
Memory Interface: Microwire serial protocol
Package Type: 8-SOIC form factor
Clock Frequency: 2 MHz operation
Write Cycle Time: 6ms

Secondary Compatibility Factors:

Voltage Supply Range: Minimum 2.5V support required
Mounting Type: Surface Mount (8-SOIC)
RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories based on voltage and temperature specifications:

Category A - Standard Temperature Range (0°C ~ 70°C): Parts maintaining the original operating temperature specification of the 93LC56AXT/SN.

Category B - Extended Temperature Range (-40°C ~ 85°C or -40°C ~ 125°C): Parts offering expanded operating temperature ranges suitable for industrial or automotive applications.

Category C - Wide Voltage Range (1.8V ~ 5.5V): Parts supporting lower minimum supply voltage, enabling operation in battery-powered or low-voltage applications.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Memory Interface	Clock Frequency	Voltage Supply	Operating Temperature	Package	Product Status	Programmable Verified
93LC56AXT/SN	Microchip Technology	2Kbit	Microwire	2 MHz	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Obsolete	Not Verified
93AA56AT-I/SN	Microchip Technology	2Kbit	Microwire	2 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Verified
93AA56AXT-I/SN	Microchip Technology	2Kbit	Microwire	2 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Not Verified
93LC56AT-E/SN	Microchip Technology	2Kbit	Microwire	2 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	Verified
93LC56AT-I/SN	Microchip Technology	2Kbit	Microwire	2 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Verified
93LC56AT/SN	Microchip Technology	2Kbit	Microwire	2 MHz	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	Verified
93LC56AXT-E/SN	Microchip Technology	2Kbit	Microwire	2 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	Not Verified
93LC56AXT-I/SN	Microchip Technology	2Kbit	Microwire	2 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Not Verified
AT93C46DN-SH-B	Microchip Technology	1Kbit	3-Wire Serial	2 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Verified

Engineering Selection Recommendations

Direct Substitutes (Recommended Priority Order):

93LC56AT/SN - Active product status with verified programmability. Maintains identical voltage supply range (2.5V ~ 5.5V) and original operating temperature specification (0°C ~ 70°C). Identical memory capacity, interface protocol, and package configuration. Highest compatibility for direct replacement in existing designs.
93LC56AT-I/SN - Active product with verified programmability. Supports extended operating temperature range (-40°C ~ 85°C) while maintaining 2.5V ~ 5.5V voltage specification. Suitable for designs requiring industrial temperature performance.
93LC56AT-E/SN - Active product with verified programmability. Extends operating temperature to -40°C ~ 125°C while maintaining voltage compatibility. Appropriate for high-temperature industrial applications.

Extended Compatibility Substitutes:

93AA56AT-I/SN - Active product with verified programmability. Expands voltage support to 1.8V minimum, enabling low-power applications. Extended temperature range (-40°C ~ 85°C). Fully compatible at electrical and functional levels.
93LC56AXT-I/SN - Active product. Maintains voltage and temperature specifications compatible with industrial requirements (-40°C ~ 85°C). Programmability not verified; requires validation in application-specific testing.
93LC56AXT-E/SN - Active product. Highest temperature rating (-40°C ~ 125°C) with 2.5V ~ 5.5V voltage support. Programmability not verified.

Limited Compatibility:

93AA56AXT-I/SN - Active product. Supports 1.8V minimum voltage and -40°C ~ 85°C temperature range. Programmability not verified; requires validation.

Non-Recommended:

AT93C46DN-SH-B - Different memory interface (3-Wire Serial vs. Microwire) and reduced memory capacity (1Kbit vs. 2Kbit). Not functionally equivalent despite identical package and clock frequency. Substitution requires complete firmware redesign.

Frequently Asked Questions (FAQ)

Q: Can I use 93LC56AT/SN as a direct replacement for 93LC56AXT/SN?

A: Yes. Both parts share identical memory capacity (2Kbit), Microwire interface, 2 MHz clock frequency, 8-SOIC packaging, and 2.5V ~ 5.5V voltage range. The 93LC56AT/SN is active and verified for programmability, making it the preferred direct substitute.

Q: What is the difference between 93LC56AT-I/SN and 93LC56AT-E/SN?

A: Both maintain 2.5V ~ 5.5V voltage compatibility. The primary difference is operating temperature: 93LC56AT-I/SN operates -40°C ~ 85°C, while 93LC56AT-E/SN extends to -40°C ~ 125°C. Select based on application temperature requirements.

Q: Why is AT93C46DN-SH-B listed as a substitute if it has different memory size and interface?

A: AT93C46DN-SH-B is listed in the original substitute field but is not functionally equivalent. It features 1Kbit capacity and 3-Wire Serial interface versus the 2Kbit Microwire specification of 93LC56AXT/SN. Substitution requires complete firmware redesign and is not recommended for direct replacement.

Q: What does "Programmable Verified" mean?

A: Programmable Verified indicates that the part has been tested and confirmed to function correctly with standard programming procedures. Parts marked "Not Verified" have not undergone this verification and may require additional validation in your specific application.

Q: Can I use 93AA56AT-I/SN in a 2.5V application?

A: Yes. The 93AA56AT-I/SN supports 1.8V ~ 5.5V voltage range, which includes 2.5V operation. It also provides extended temperature range (-40°C ~ 85°C) and verified programmability, making it suitable for low-voltage and industrial applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and identical MSL rating (1 - Unlimited), ensuring environmental and reliability standards consistency.

Q: What packaging options are available for these substitutes?

A: All substitute parts use 8-SOIC surface mount packaging (0.154", 3.90mm Width). Packaging format variations (Tape & Reel, Cut Tape, Tube) do not affect electrical or mechanical compatibility; they reflect distribution and handling methods only.

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