93LC56XT-I/SN EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC56XT-I/SN is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 8-SOIC surface mount packaging. This device operates at 2 MHz clock frequency with a 10ms write cycle time and supports supply voltages from 2.5V to 5.5V across an operating temperature range of -40°C to 85°C.

The 93LC56XT-I/SN is classified as Obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this memory architecture.

Key Parameters

Parameter	Value
Memory Size	2Kbit
Memory Organization	256 x 8, 128 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	10ms
Supply Voltage Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC56XT-I/SN is determined by the following critical parameters:

Memory Size: 2Kbit (non-negotiable)
Memory Organization: 256 x 8 or 128 x 16 (non-negotiable)
Memory Interface: Microwire protocol (non-negotiable)
Package / Case: 8-SOIC form factor (non-negotiable)
Supply Voltage Range: Must encompass or exceed 2.5V ~ 5.5V
Operating Temperature: Must support -40°C ~ 85°C minimum
Clock Frequency: 2 MHz or higher (backward compatible)
Write Cycle Time: 10ms or faster (backward compatible)

Substitute parts are grouped into two categories based on clock frequency and write cycle performance:

Category A (2 MHz Operation): Parts maintaining 2 MHz clock frequency and 10ms write cycle time, offering direct functional equivalence.

Category B (3 MHz Operation): Parts operating at 3 MHz clock frequency with 6ms write cycle time, providing enhanced performance while maintaining full backward compatibility with 2 MHz applications.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Write Cycle Time	Supply Voltage	Operating Temperature	Package	Product Status
93LC56XT-I/SN	Microchip Technology	2Kbit	2 MHz	10ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Obsolete
93AA56T-I/SN	Microchip Technology	2Kbit	2 MHz	10ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
93AA56T/SN	Microchip Technology	2Kbit	2 MHz	10ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
93LC56T-I/SN	Microchip Technology	2Kbit	2 MHz	10ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
93AA56C-I/SN	Microchip Technology	2Kbit	3 MHz	6ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
93AA56CT-I/SN	Microchip Technology	2Kbit	3 MHz	6ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
93AA56CXT-I/SN	Microchip Technology	2Kbit	3 MHz	6ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
93LC56CT-I/SN	Microchip Technology	2Kbit	3 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
93LC56CT-E/SN	Microchip Technology	2Kbit	3 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active
93LC56CXT-I/SN	Microchip Technology	2Kbit	3 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
93LC56CXT-E/SN	Microchip Technology	2Kbit	3 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalence):

93LC56T-I/SN and 93AA56T-I/SN are the preferred direct substitutes, maintaining identical 2 MHz clock frequency and 10ms write cycle time specifications. Both parts are Active status with full RoHS3 compliance. The 93AA56T-I/SN offers extended supply voltage support (1.8V minimum) compared to the original part's 2.5V minimum, providing additional design flexibility for low-voltage applications.

Secondary Substitutes (Enhanced Performance):

93LC56CT-I/SN, 93LC56CXT-I/SN, 93AA56C-I/SN, 93AA56CT-I/SN, and 93AA56CXT-I/SN operate at 3 MHz with 6ms write cycle time. These parts are fully backward compatible with 2 MHz applications and deliver improved write performance. All maintain Active product status and ROHS3 compliance.

Extended Temperature Range Option:

93LC56CT-E/SN and 93LC56CXT-E/SN support -40°C to 125°C operating temperature, extending the upper thermal limit by 40°C. These parts are suitable for applications requiring enhanced high-temperature performance while maintaining 2.5V ~ 5.5V supply voltage compatibility.

Frequently Asked Questions (FAQ)

Q: Can 93AA56 series parts replace 93LC56XT-I/SN?

A: Yes. The 93AA56 series maintains identical 2Kbit memory size, Microwire interface, and 8-SOIC packaging. The 93AA56T-I/SN and 93AA56T/SN provide direct 2 MHz equivalence. The 93AA56C-I/SN, 93AA56CT-I/SN, and 93AA56CXT-I/SN offer 3 MHz operation with backward compatibility.

Q: What is the difference between 2 MHz and 3 MHz variants?

A: Clock frequency determines maximum data transfer rate and write cycle time. 2 MHz parts require 10ms per write cycle; 3 MHz parts complete writes in 6ms. Both are compatible with 2 MHz system designs, with 3 MHz parts providing performance headroom.

Q: Are packaging options interchangeable?

A: All listed substitutes use 8-SOIC (0.154", 3.90mm Width) surface mount packaging. Packaging variants (Tube, Tape & Reel, Cut Tape) refer to supply format only and do not affect electrical or mechanical compatibility on the PCB.

Q: Does supply voltage range affect substitution?

A: The original 93LC56XT-I/SN operates 2.5V ~ 5.5V. Substitutes with 1.8V minimum (93AA56 series) are fully compatible and offer extended low-voltage capability. Substitutes maintaining 2.5V ~ 5.5V range are direct voltage equivalents.

Q: What is the significance of temperature grade designations (I vs. E)?

A: The "I" suffix indicates -40°C ~ 85°C operating range; the "E" suffix indicates -40°C ~ 125°C. Both grades are compatible with the original part's -40°C ~ 85°C specification. The "E" grade provides additional margin for high-temperature environments.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the original part's environmental certifications.

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