Equivalent & Substitute Parts for 93LC46A/ST

Part Overview

The 93LC46A/ST is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating at 2 MHz clock frequency. This component is designed for non-volatile data storage applications requiring low-power operation across industrial and commercial temperature ranges. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent memory capacity, interface protocol, package form factor, and electrical operating parameters align with application requirements.

Key Parameters

Parameter	Specification
Memory Size	1Kbit
Memory Organization	128 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-TSSOP
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC46A/ST is determined by the following critical parameters:

Primary Compatibility Criteria:

Memory capacity of 1Kbit with 128 x 8 organization
Serial interface protocol (Microwire or 3-Wire Serial)
8-TSSOP surface mount package
2 MHz clock frequency operation
Non-volatile EEPROM technology

Voltage and Temperature Considerations: The 93LC46A/ST operates at 2.5V ~ 5.5V supply voltage with 0°C ~ 70°C temperature range. Substitute parts with extended voltage ranges (1.8V ~ 5.5V) and wider temperature ratings (-40°C ~ 85°C) are functionally compatible and provide enhanced operational flexibility for applications requiring broader environmental specifications.

Interface Protocol Variations: The 93LC46A/ST uses Microwire protocol. The AT93C46D-TH-B employs 3-Wire Serial protocol, which represents a different serial interface standard. While both are single-chip EEPROM solutions with identical memory organization, interface protocol differences require firmware or hardware adaptation during substitution.

Parameter Comparison

Parameter	93LC46A/ST	93AA46A-I/ST	93LC46A-I/ST	AT93C46D-TH-B
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	128 x 8	128 x 8	128 x 8	128 x 8, 64 x 16
Memory Interface	Microwire	Microwire	Microwire	3-Wire Serial
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz
Write Cycle Time	6ms	6ms	6ms	5ms
Voltage Supply Range	2.5V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

93AA46A-I/ST: Direct functional substitute with extended operating specifications. Identical memory capacity, organization, and Microwire interface. Extended voltage range (1.8V ~ 5.5V) and temperature range (-40°C ~ 85°C) provide compatibility with applications requiring lower supply voltages or wider environmental operation. All compliance certifications match the primary part.

93LC46A-I/ST: Pin-compatible and functionally equivalent substitute. Maintains identical Microwire interface protocol and memory specifications. Extended temperature range (-40°C ~ 85°C) accommodates industrial applications. Voltage supply range matches the primary part (2.5V ~ 5.5V). Suitable for direct replacement in designs where temperature performance enhancement is required.

AT93C46D-TH-B: Functionally compatible substitute with protocol variation. Provides 1Kbit memory capacity with dual organization options (128 x 8 or 64 x 16). Uses 3-Wire Serial interface instead of Microwire, requiring interface protocol adaptation. Extended voltage (1.8V ~ 5.5V) and temperature ranges (-40°C ~ 85°C). Faster write cycle time (5ms vs. 6ms). Suitable for applications where 3-Wire Serial protocol is supported or where enhanced temperature and voltage specifications are required.

Frequently Asked Questions (FAQ)

Q: Can 93AA46A-I/ST replace 93LC46A/ST in existing designs? A: Yes. Both parts share identical memory capacity (1Kbit), organization (128 x 8), Microwire interface, and 8-TSSOP package. The 93AA46A-I/ST offers extended voltage (1.8V minimum vs. 2.5V) and temperature ranges (-40°C to 85°C vs. 0°C to 70°C), making it a direct substitute with enhanced specifications.

Q: What is the difference between Microwire and 3-Wire Serial interfaces? A: Microwire and 3-Wire Serial are distinct serial communication protocols. The 93LC46A/ST uses Microwire protocol, while AT93C46D-TH-B uses 3-Wire Serial. Substitution between these protocols requires firmware or hardware interface modification to support the different serial communication standard.

Q: Is AT93C46D-TH-B compatible with 93LC46A/ST applications? A: Functional compatibility exists for memory capacity and organization (1Kbit, 128 x 8). However, the AT93C46D-TH-B uses 3-Wire Serial protocol instead of Microwire, requiring interface protocol adaptation. The part offers faster write cycle time (5ms vs. 6ms) and extended environmental specifications.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts (93AA46A-I/ST, 93LC46A-I/ST, AT93C46D-TH-B) maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the primary part's environmental and regulatory certifications.

Q: What temperature range should I select for industrial applications? A: For industrial environments, 93AA46A-I/ST, 93LC46A-I/ST, or AT93C46D-TH-B are recommended, as all provide -40°C to 85°C operating range compared to the primary part's 0°C to 70°C specification.

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