93LC46AT/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC46AT/ST is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 8-TSSOP surface mount packaging. This non-volatile memory device operates across a 2.5V to 5.5V supply voltage range with a 2 MHz clock frequency and 6ms write cycle time. The part 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 protocol compatibility, package form factor, and electrical operating parameters align with the original specification, enabling direct functional replacement in circuit applications.

Substiute Parts

93LC46AT/ST

Microchip TechnologyIn Stock: 89293LC46AT/ST Datasheet

Current PartRFQ

93LC46AT-I/ST

Microchip TechnologyIn Stock: 384193LC46AT-I/ST Datasheet

MFR RecommendedRFQ

AT93C46D-TH-T

Microchip TechnologyIn Stock: 5128AT93C46D-TH-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 93LC46AT/ST are identified based on the following critical parameters:

Primary Substitution Criteria:

• Memory capacity: 1Kbit minimum
• Package form factor: 8-TSSOP surface mount
• Serial interface compatibility: Microwire or 3-Wire Serial protocol
• Supply voltage range: Must encompass or exceed 2.5V ~ 5.5V
• Clock frequency: 2 MHz operation capability
• Product status: Active manufacturing status
• Compliance: ROHS3 certification

Identified Substitute Parts:

1. 93LC46AT-I/ST — Manufacturer-recommended substitute with identical memory specifications, Microwire interface, and 8-TSSOP packaging. Extended operating temperature range (-40°C to 85°C) provides broader environmental compatibility compared to the original part (0°C to 70°C).

2. AT93C46D-TH-T — Alternative substitute featuring 1Kbit memory capacity in 8-TSSOP packaging with 3-Wire Serial interface protocol. Supports dual memory organization (128 x 8 or 64 x 16), extended supply voltage range (1.8V ~ 5.5V), and improved write cycle time (5ms). Operating temperature range matches extended specification (-40°C to 85°C).

Parameter Comparison

Engineering Selection Recommendations

93LC46AT-I/ST Selection Criteria:

This substitute maintains identical electrical and functional specifications to the 93LC46AT/ST with Microwire interface protocol compatibility. The extended operating temperature range (-40°C to 85°C) accommodates industrial and automotive applications beyond the original part's 0°C to 70°C specification. Both parts carry ROHS3 compliance and unlimited MSL rating. This substitute is recommended for direct replacement in existing designs without circuit modification.

AT93C46D-TH-T Selection Criteria:

This substitute provides 1Kbit memory capacity in the same 8-TSSOP package with extended supply voltage range (1.8V ~ 5.5V) and improved write cycle time (5ms versus 6ms). The 3-Wire Serial interface differs from the Microwire protocol of the original part, requiring firmware or software protocol adjustment in host controller implementations. Extended operating temperature range (-40°C to 85°C) and ROHS3 compliance align with industrial requirements. This substitute is suitable for new designs or redesigns where protocol adaptation is feasible.

Frequently Asked Questions (FAQ)

Q: Can 93LC46AT-I/ST replace 93LC46AT/ST without circuit modification?

A: Yes. Both parts feature identical Microwire interface protocol, 1Kbit memory capacity, 2 MHz clock frequency, and 8-TSSOP packaging. The extended operating temperature range of 93LC46AT-I/ST (-40°C to 85°C) provides broader environmental compatibility. No circuit or firmware changes are required.

Q: What is the primary difference between 93LC46AT-I/ST and AT93C46D-TH-T?

A: The primary difference is the serial interface protocol. 93LC46AT-I/ST uses Microwire protocol identical to the original part, while AT93C46D-TH-T uses 3-Wire Serial protocol. Both maintain 1Kbit capacity and 8-TSSOP packaging. Protocol differences require host controller firmware adaptation for AT93C46D-TH-T implementation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both 93LC46AT-I/ST and AT93C46D-TH-T carry ROHS3 compliance certification with unlimited MSL rating (MSL 1), matching the original 93LC46AT/ST specification.

Q: What is the supply voltage compatibility range across all parts?

A: The 93LC46AT/ST and 93LC46AT-I/ST operate at 2.5V ~ 5.5V. The AT93C46D-TH-T extends this range to 1.8V ~ 5.5V, providing lower voltage operation capability for battery-powered or low-power applications.

Q: Does the 8-TSSOP package remain consistent across all parts?

A: Yes. All three parts use identical 8-TSSOP surface mount packaging (0.173", 4.40mm width), enabling direct PCB footprint compatibility without layout modification.