93C46AT-I/MS EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46AT-I/MS is a 1Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, designed for applications requiring serial data storage with Microwire interface protocol. This component operates at 2 MHz clock frequency with a supply voltage range of 4.5V to 5.5V and is rated for industrial temperature range (-40°C to 85°C). The device is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent memory capacity, interface compatibility, and electrical specifications align within acceptable operational parameters, enabling direct or near-direct replacement in circuit designs.

Substiute Parts

93C46AT-I/MS

Microchip TechnologyIn Stock: 103293C46AT-I/MS Datasheet

Current PartRFQ

AT93C46DY6-YH-T

Microchip TechnologyIn Stock: 2392AT93C46DY6-YH-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 93C46AT-I/MS is determined by the following critical parameters:

Memory Capacity & Organization: Substitute parts must provide 1Kbit storage capacity with 128 x 8 bit organization to maintain data structure compatibility.

Serial Interface Protocol: The Microwire interface is the primary communication standard for this device. Substitute parts utilizing 3-Wire Serial protocol are functionally equivalent, as 3-Wire Serial represents an industry-standard evolution of Microwire architecture with backward compatibility for serial memory access patterns.

Clock Frequency: Operation at 2 MHz ensures timing compatibility with host controller designs.

Supply Voltage Range: Substitute parts must operate within or encompass the 4.5V to 5.5V range. Extended voltage ranges (1.8V ~ 5.5V) provide broader operational flexibility while maintaining 5V compatibility.

Temperature Rating: Industrial temperature range (-40°C to 85°C) is maintained across substitute options.

Mounting & Package: Surface mount technology with 8-pin configurations ensures physical compatibility with PCB layouts designed for the original component.

Compliance & Certifications: ROHS3 compliance and REACH unaffected status are maintained across all substitute parts.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: AT93C46DY6-YH-T

The AT93C46DY6-YH-T is the manufacturer-recommended substitute for the 93C46AT-I/MS. Both devices are manufactured by Microchip Technology and maintain active production status. The substitute part provides equivalent 1Kbit EEPROM capacity with compatible serial interface operation at 2 MHz clock frequency.

Voltage Compatibility: The substitute part operates across an extended supply voltage range (1.8V ~ 5.5V) that encompasses the original part's 4.5V to 5.5V specification, ensuring full compatibility in 5V system designs.

Interface Compatibility: The 3-Wire Serial protocol in the substitute part is functionally equivalent to the Microwire interface, supporting the same serial memory access methodology required by host controllers designed for the original component.

Compliance Status: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting identical regulatory requirements for industrial and commercial applications.

Packaging Consideration: The substitute part uses 8-UFDFN Exposed Pad packaging versus the original 8-MSOP package. PCB layout modifications are required to accommodate the different package footprint.

Moisture Sensitivity: The substitute part carries MSL 3 rating (168 hours) compared to MSL 1 (unlimited) for the original part. This represents a more stringent moisture handling requirement during storage and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the AT93C46DY6-YH-T directly replace the 93C46AT-I/MS without firmware changes?

A: The 3-Wire Serial interface in the substitute part is functionally equivalent to the Microwire protocol. Direct replacement is possible if the host controller firmware supports 3-Wire Serial communication. Verification of controller compatibility with the serial protocol is required before implementation.

Q: What is the difference between Microwire and 3-Wire Serial interfaces?

A: Both protocols are serial memory communication standards using three signal lines (clock, data input, data output). 3-Wire Serial represents an industry-standard implementation that maintains backward compatibility with Microwire-based designs. The functional operation and command structure are equivalent for memory read/write operations.

Q: Does the extended voltage range (1.8V ~ 5.5V) of the substitute part affect 5V system operation?

A: No. The substitute part's extended voltage range includes the original part's 4.5V to 5.5V specification. Operation in 5V systems is fully supported and identical to the original component.

Q: What PCB modifications are necessary due to package differences?

A: The substitute part uses 8-UFDFN Exposed Pad packaging instead of 8-MSOP. The footprint, pad layout, and via placement differ. PCB redesign is required to accommodate the new package geometry. Consult the respective datasheets for detailed footprint specifications.

Q: How does the MSL 3 rating affect component handling?

A: MSL 3 (168 hours) requires stricter moisture control during storage and assembly compared to MSL 1 (unlimited). Components must be stored in dry conditions and used within 168 hours of bag opening. Standard moisture barrier packaging and desiccant storage are required.

Q: Are both parts suitable for industrial temperature applications?

A: Yes. Both the 93C46AT-I/MS and AT93C46DY6-YH-T maintain the same operating temperature range of -40°C to 85°C, supporting industrial and extended commercial temperature requirements.