93LC66AT-I/MC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC66AT-I/MC is a 4Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating at 2 MHz clock frequency. This component is designed for applications requiring persistent data storage in embedded systems, industrial controllers, and consumer electronics. The device is currently in active production status with verified programmability through DiGi-Electronics channels. Substitute parts may be required due to inventory constraints, packaging format preferences, or supply chain optimization while maintaining functional and electrical compatibility.

Key Parameters

Parameter	Specification
Memory Size	4Kbit
Memory Organization	512 x 8
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	6ms
Supply Voltage Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-VFDFN Exposed Pad (2x3mm)
Mounting Type	Surface Mount
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC66AT-I/MC is determined by strict equivalence across the following critical parameters:

Memory capacity (4Kbit) and organization (512 x 8 bits)
Serial interface protocol (Microwire)
Clock frequency (2 MHz maximum)
Write cycle time (6ms)
Operating temperature range (-40°C ~ 85°C)
Physical package (8-VFDFN with exposed pad, 2x3mm footprint)
Surface mount mounting type

The 93AA66AT-I/MC qualifies as a direct substitute based on identical memory specifications, interface protocol, clock frequency, write cycle time, package geometry, and mounting technology. Differences in supply voltage range and moisture sensitivity level do not affect functional substitutability in applications designed for the 93LC66AT-I/MC.

Parameter Comparison

Parameter	93LC66AT-I/MC (Main Part)	93AA66AT-I/MC (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	4Kbit	4Kbit
Memory Organization	512 x 8	512 x 8
Memory Interface	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz
Write Cycle Time	6ms	6ms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Supply Voltage Range	2.5V ~ 5.5V	1.8V ~ 5.5V
Package / Case	8-VFDFN Exposed Pad	8-VFDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active

Engineering Selection Recommendations

Both the 93LC66AT-I/MC and 93AA66AT-I/MC are active production components manufactured by Microchip Technology with ROHS3 compliance and verified programmability. The 93AA66AT-I/MC provides extended supply voltage range capability (1.8V minimum versus 2.5V minimum), enabling operation in lower-voltage applications. The 93AA66AT-I/MC features improved moisture sensitivity classification (MSL 1 versus MSL 3), reducing moisture-related reliability concerns in high-humidity storage and assembly environments. Selection between these parts should be based on specific application voltage requirements and environmental storage conditions. Both components maintain identical memory capacity, interface protocol, timing specifications, and physical package dimensions, ensuring direct functional interchangeability in circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the 93AA66AT-I/MC replace the 93LC66AT-I/MC in existing designs?

A: Yes. Both components share identical memory capacity (4Kbit), organization (512 x 8), Microwire interface, clock frequency (2 MHz), write cycle time (6ms), operating temperature range (-40°C ~ 85°C), and 8-VFDFN package geometry. The 93AA66AT-I/MC is a direct functional substitute.

Q: What is the difference in supply voltage specifications?

A: The 93LC66AT-I/MC operates from 2.5V to 5.5V. The 93AA66AT-I/MC operates from 1.8V to 5.5V. The extended lower voltage limit of the 93AA66AT-I/MC allows operation in applications with reduced supply voltages, while maintaining full compatibility in designs using the 2.5V to 5.5V range.

Q: How do moisture sensitivity levels affect component selection?

A: The 93LC66AT-I/MC has MSL 3 (168 hours maximum floor life), while the 93AA66AT-I/MC has MSL 1 (unlimited floor life). MSL 1 classification indicates superior moisture resistance and reduced risk of moisture-induced failures during storage and assembly processes. Selection should consider manufacturing environment and storage duration requirements.

Q: Are the physical packages identical?

A: Yes. Both components use the 8-VFDFN package with exposed pad in 2x3mm footprint. PCB layout, solder pad geometry, and component placement are identical between the two parts.

Q: Do both parts have the same compliance certifications?

A: Yes. Both the 93LC66AT-I/MC and 93AA66AT-I/MC are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 and HTSUS 8542.32.0051.

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