93LC46A-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC46A-I/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, designed for applications requiring persistent data storage in compact form factors. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the allowed parameter set.

Substiute Parts

93LC46A-I/ST

Microchip TechnologyIn Stock: 434293LC46A-I/ST Datasheet

Current PartRFQ

93LC46AT-I/ST

Microchip TechnologyIn Stock: 384193LC46AT-I/ST Datasheet

DirectRFQ

93AA46A-I/ST

Microchip TechnologyIn Stock: 250793AA46A-I/ST Datasheet

MFR RecommendedRFQ

AT93C46D-TH-B

Microchip TechnologyIn Stock: 2367AT93C46D-TH-B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC46A-I/ST is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

• Memory capacity: 1Kbit
• Memory organization: 128 x 8 bit structure
• Package type: 8-TSSOP form factor with 0.173" width (4.40mm)
• Mounting type: Surface mount configuration
• Operating temperature range: -40°C to 85°C minimum
• RoHS3 compliance status
• Active product status

Interface and Performance Criteria:

• Serial interface protocol compatibility (Microwire or 3-Wire Serial)
• Clock frequency: 2 MHz operation
• Write cycle time: 5ms to 6ms range
• Supply voltage compatibility within specified ranges

Packaging Format Consideration: Substitutes may differ in packaging format (Tube versus Tape & Reel) without affecting electrical or mechanical compatibility, as both formats contain identical die and lead configurations.

Parameter Comparison

Engineering Selection Recommendations

93LC46AT-I/ST (Direct Substitute - Tape & Reel Format)

This part is electrically and mechanically identical to the 93LC46A-I/ST with the sole distinction being packaging format. The 93LC46AT-I/ST is supplied in Tape & Reel configuration rather than Tube, making it suitable for high-volume automated assembly processes. All electrical parameters, memory specifications, interface protocols, and compliance certifications are equivalent. Selection between these two parts depends on production volume requirements and assembly line equipment compatibility.

93AA46A-I/ST (Manufacturer Recommended Substitute)

The 93AA46A-I/ST maintains full electrical and functional equivalence with expanded supply voltage capability (1.8V minimum versus 2.5V minimum). This part supports the same Microwire interface, 2 MHz clock frequency, and 1Kbit memory organization. The extended lower voltage range provides additional design flexibility for low-power applications. All other parameters including package type, operating temperature range, and compliance status remain identical. This part is suitable for direct replacement in applications where the lower minimum supply voltage is not a constraint.

AT93C46D-TH-B (Interface Protocol Variation)

The AT93C46D-TH-B differs from the 93LC46A-I/ST in serial interface protocol, implementing 3-Wire Serial communication instead of Microwire. While maintaining identical 1Kbit memory capacity, 8-TSSOP packaging, and 2 MHz clock frequency, this part requires circuit-level interface modifications. The AT93C46D-TH-B offers a marginally faster write cycle time (5ms versus 6ms) and extended lower supply voltage range (1.8V minimum). This substitute is applicable only when the host system can accommodate 3-Wire Serial protocol implementation.

Frequently Asked Questions (FAQ)

Q: Can 93LC46AT-I/ST replace 93LC46A-I/ST in production?

A: Yes. The 93LC46AT-I/ST is electrically and mechanically identical, differing only in packaging format (Tape & Reel versus Tube). Selection depends on assembly process requirements. Both parts contain identical die, lead configurations, and electrical specifications.

Q: What is the key difference between 93AA46A-I/ST and 93LC46A-I/ST?

A: The 93AA46A-I/ST extends the minimum supply voltage specification to 1.8V compared to 2.5V for the 93LC46A-I/ST. All other electrical parameters, memory organization, interface protocol, and package specifications remain equivalent. This part is suitable for applications requiring lower supply voltage operation.

Q: Is AT93C46D-TH-B a direct replacement for 93LC46A-I/ST?

A: No. While AT93C46D-TH-B maintains identical memory capacity and package type, it implements 3-Wire Serial interface protocol instead of Microwire. Direct substitution requires circuit-level modifications to the serial communication interface. This part is not suitable for plug-and-play replacement without firmware or hardware redesign.

Q: Do all substitute parts maintain ROHS3 compliance?

A: Yes. All listed substitute parts (93LC46AT-I/ST, 93AA46A-I/ST, and AT93C46D-TH-B) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the 93LC46A-I/ST.

Q: What determines whether a part can substitute for 93LC46A-I/ST?

A: Substitution eligibility requires equivalence in memory capacity (1Kbit), memory organization (128 x 8), 8-TSSOP package type, surface mount configuration, operating temperature range (-40°C to 85°C), and active product status. Interface protocol compatibility and supply voltage ranges must support the application requirements.

Q: Are there inventory differences between substitute parts?

A: Yes. Current inventory levels vary: 93LC46A-I/ST (4255 pcs), 93LC46AT-I/ST (3800 pcs), 93AA46A-I/ST (2467 pcs), and AT93C46D-TH-B (2300 pcs). Availability should be confirmed with the supplier for time-sensitive applications.