Equivalent & Substitute Parts for 93LC46CT-I/MC

Part Overview

The 93LC46CT-I/MC is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating across a 2.5V to 5.5V supply voltage range. This device is classified as Active product status with verified programmability through DiGi-Electronics. Alternative equivalent parts become necessary when addressing specific application requirements such as extended voltage range compatibility, different serial interface protocols, or alternative packaging formats while maintaining core memory capacity and functional specifications.

Key Parameters

Parameter	Specification
Memory Size	1Kbit
Memory Organization	128 x 8, 64 x 16
Memory Interface	Microwire
Clock Frequency	3 MHz
Write Cycle Time	6ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-VFDFN Exposed Pad
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC46CT-I/MC is determined by the following critical parameters: memory capacity (1Kbit), memory organization (128 x 8 or 64 x 16), operating temperature range (-40°C to 85°C), RoHS3 compliance, and surface mount packaging format. Substitute parts must maintain these core specifications to ensure functional equivalence in target applications.

The 93AA46CT-I/MC qualifies as a direct substitute based on identical memory specifications, matching temperature range, and equivalent RoHS compliance. This part extends the minimum supply voltage to 1.8V, providing broader voltage compatibility.

The AT93C46DY6-YH-T qualifies as a functional substitute with identical memory capacity and organization, matching temperature range and RoHS compliance. This part operates with a 3-Wire Serial interface protocol instead of Microwire, operates at 2 MHz clock frequency, and features a 5ms write cycle time. The package format differs as 8-Mini Map (2x3) with extended voltage range (1.8V ~ 5.5V).

Parameter Comparison

Parameter	93LC46CT-I/MC	93AA46CT-I/MC	AT93C46DY6-YH-T
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Memory Size	1Kbit	1Kbit	1Kbit
Memory Organization	128 x 8, 64 x 16	128 x 8, 64 x 16	128 x 8, 64 x 16
Memory Interface	Microwire	Microwire	3-Wire Serial
Clock Frequency	3 MHz	3 MHz	2 MHz
Write Cycle Time	6ms	6ms	5ms
Voltage Supply Range	2.5V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-VFDFN Exposed Pad	8-VFDFN Exposed Pad	8-UFDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

Selection between the 93LC46CT-I/MC and its substitutes depends on specific application interface and voltage requirements. The 93AA46CT-I/MC maintains identical Microwire interface protocol and clock frequency while extending minimum supply voltage compatibility to 1.8V, making it suitable for applications requiring lower voltage operation without interface redesign.

The AT93C46DY6-YH-T introduces a 3-Wire Serial interface protocol and operates at 2 MHz clock frequency with a 5ms write cycle time. This substitute requires interface protocol compatibility verification in the target application. Both substitute parts maintain Active product status and ROHS3 compliance equivalent to the primary part.

Frequently Asked Questions (FAQ)

Q: Can the 93AA46CT-I/MC directly replace the 93LC46CT-I/MC without circuit modifications?

A: Yes. Both parts implement the Microwire interface protocol, operate at 3 MHz clock frequency, and share identical memory organization. The 93AA46CT-I/MC extends the minimum supply voltage to 1.8V, providing enhanced compatibility with lower voltage systems while maintaining full backward compatibility with 2.5V minimum designs.

Q: What interface protocol differences exist between the 93LC46CT-I/MC and AT93C46DY6-YH-T?

A: The 93LC46CT-I/MC uses Microwire serial interface, while the AT93C46DY6-YH-T uses 3-Wire Serial interface protocol. These protocols differ in signal timing and control sequences. Substitution requires verification that the target application's serial interface controller supports 3-Wire Serial protocol.

Q: Are there package compatibility considerations when substituting the AT93C46DY6-YH-T?

A: Yes. The AT93C46DY6-YH-T uses 8-Mini Map (2x3) package format, while the primary part uses 8-VFDFN Exposed Pad format. Both are surface mount packages with identical pin counts and exposed pad thermal characteristics. PCB layout verification is necessary to confirm physical fit and thermal performance equivalence.

Q: Do all three parts maintain identical operating temperature ranges?

A: Yes. All three parts operate across -40°C to 85°C ambient temperature range, ensuring thermal compatibility across standard industrial and commercial applications.

Q: What voltage range considerations apply when selecting between these parts?

A: The 93LC46CT-I/MC operates from 2.5V to 5.5V. Both substitute parts extend the minimum voltage to 1.8V, enabling operation in low-voltage applications. All three parts support 5.5V maximum supply voltage, maintaining compatibility with standard 5V logic systems.

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