Equivalent & Substitute Parts for 93LC46XT/SN

Part Overview

The 93LC46XT/SN is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 8-SOIC surface mount packaging. This device operates at 2 MHz clock frequency with a 10ms write cycle time and supports supply voltages from 2.5V to 5.5V across an industrial temperature range of 0°C to 70°C. The part is ROHS3 compliant and currently active in production with 718 units in stock.

Substitute parts are necessary when the primary part becomes unavailable, when extended temperature range operation is required, when higher clock frequency performance is needed, or when alternative packaging formats are preferred for manufacturing processes.

Substiute Parts

93LC46XT/SN

Microchip TechnologyIn Stock: 81393LC46XT/SN Datasheet

Current PartRFQ

93AA46CT-I/SN

Microchip TechnologyIn Stock: 239193AA46CT-I/SN Datasheet

MFR RecommendedRFQ

93LC46CT-E/SN

Microchip TechnologyIn Stock: 397993LC46CT-E/SN Datasheet

MFR RecommendedRFQ

93LC46CT-I/SN

Microchip TechnologyIn Stock: 383293LC46CT-I/SN Datasheet

MFR RecommendedRFQ

AT93C46DN-SH-T

Microchip TechnologyIn Stock: 88429AT93C46DN-SH-T Datasheet

MFR RecommendedRFQ

M93C46-RMN3TP/K

STMicroelectronicsIn Stock: 9539M93C46-RMN3TP/K Datasheet

MFR RecommendedRFQ

M93C46-WMN6P

STMicroelectronicsIn Stock: 3499M93C46-WMN6P Datasheet

MFR RecommendedRFQ

M93C46-WMN6TP

STMicroelectronicsIn Stock: 61219M93C46-WMN6TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC46XT/SN is determined by the following critical parameters:

Memory Capacity & Organization: All substitute parts must maintain 1Kbit capacity with 128 x 8 or 64 x 16 organization to ensure data structure compatibility.

Package & Mounting: All substitutes use 8-SOIC surface mount packaging with identical 0.154" (3.90mm) width, ensuring PCB footprint compatibility without layout modifications.

Serial Interface Protocol: The primary part uses Microwire protocol. Substitutes using Microwire interface are direct functional equivalents. The AT93C46DN-SH-T uses 3-Wire Serial protocol and represents a protocol variant that requires interface verification before substitution.

Clock Frequency & Write Performance: The 93LC46XT/SN operates at 2 MHz with 10ms write cycle time. Substitutes operating at 2 MHz or higher with equal or faster write cycles maintain or improve performance characteristics.

Supply Voltage Range: The 93LC46XT/SN requires 2.5V ~ 5.5V operation. Substitutes with equal or wider voltage ranges ensure compatibility across power supply designs.

Temperature Range: The 93LC46XT/SN operates 0°C ~ 70°C. Substitutes with extended temperature ranges provide additional operational flexibility.

Compliance & Certifications: All substitutes maintain ROHS3 compliance and REACH unaffected status matching the primary part.

Parameter Comparison

Engineering Selection Recommendations

Direct Microwire Substitutes (Highest Compatibility)

The 93LC46CT-E/SN, 93LC46CT-I/SN, M93C46-RMN3TP/K, M93C46-WMN6P, and M93C46-WMN6TP maintain Microwire protocol compatibility with the primary part. These devices support identical memory organization and package specifications. Selection among these options depends on temperature range requirements and packaging format needs.

For applications requiring extended temperature operation beyond 70°C, the 93LC46CT-E/SN supports -40°C to 125°C operation while maintaining 2.5V ~ 5.5V supply compatibility. The M93C46-RMN3TP/K offers -40°C to 125°C range with automotive AEC-Q100 qualification and 1.8V minimum supply voltage.

For standard industrial temperature range (-40°C to 85°C), the 93LC46CT-I/SN and M93C46-WMN6TP provide equivalent performance with higher clock frequency (3 MHz and 2 MHz respectively) and faster write cycles (6ms and 5ms).

Packaging Format Considerations

The primary part uses Tape & Reel packaging. Substitutes available in Cut Tape & Digi-Reel format (93AA46CT-I/SN, 93LC46CT-I/SN, AT93C46DN-SH-T, M93C46-RMN3TP/K, M93C46-WMN6TP) accommodate alternative manufacturing processes. The M93C46-WMN6P is available in Tube packaging for lower-volume applications.

Protocol Variant Consideration

The AT93C46DN-SH-T uses 3-Wire Serial protocol instead of Microwire. While maintaining identical memory capacity and package specifications, this device requires interface circuit verification before substitution. This part offers the highest inventory availability (88400 units) and extended temperature range (-40°C to 85°C).

Compliance & Availability

All substitute parts maintain ROHS3 compliance and REACH unaffected status. The M93C46-RMN3TP/K includes AEC-Q100 automotive qualification for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 93LC46XT/SN with any of these parts without circuit modifications?

A: Direct substitution without circuit modifications is possible with all Microwire protocol variants: 93AA46CT-I/SN, 93LC46CT-E/SN, 93LC46CT-I/SN, M93C46-RMN3TP/K, M93C46-WMN6P, and M93C46-WMN6TP. These maintain identical memory organization, package footprint, and serial interface protocol. The AT93C46DN-SH-T uses 3-Wire Serial protocol and requires interface circuit verification.

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

A: Both are serial communication protocols for EEPROM devices. Microwire uses a specific timing and signal sequence defined by National Semiconductor. 3-Wire Serial is a variant protocol. Interface compatibility depends on the host controller's serial interface implementation. Verify your circuit design supports the selected protocol before substitution.

Q: Does higher clock frequency affect compatibility?

A: Higher clock frequency (3 MHz vs. 2 MHz) improves data transfer speed and does not reduce compatibility. Devices operating at 3 MHz (93AA46CT-I/SN, 93LC46CT-E/SN, 93LC46CT-I/SN) are backward compatible with circuits designed for 2 MHz operation.

Q: Can I use a substitute with a wider temperature range in a circuit designed for 0°C to 70°C operation?

A: Yes. Substitutes with extended temperature ranges (-40°C to 85°C or -40°C to 125°C) operate correctly within the original 0°C to 70°C specification. Extended range capability provides additional operational margin without affecting performance in the original temperature window.

Q: What is the significance of the voltage supply range differences?

A: The primary part requires 2.5V ~ 5.5V. Substitutes with 1.8V minimum supply voltage (93AA46CT-I/SN, AT93C46DN-SH-T, M93C46-RMN3TP/K) support lower-voltage applications. Substitutes with 2.5V minimum (93LC46CT-E/SN, 93LC46CT-I/SN, M93C46-WMN6P, M93C46-WMN6TP) match the original specification. Select based on your circuit's power supply design.

Q: What does AEC-Q100 qualification mean?

A: AEC-Q100 is an automotive industry qualification standard. The M93C46-RMN3TP/K meets this qualification, making it suitable for automotive applications requiring component reliability and quality assurance standards beyond standard industrial specifications.

Q: How do write cycle time differences affect system performance?

A: The primary part has 10ms write cycle time. Faster alternatives (5ms to 6ms) reduce data write latency, improving overall system performance. Circuits designed for 10ms write cycles operate correctly with faster substitutes without modification.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel, Cut Tape & Digi-Reel, and Tube packaging formats contain identical die and electrical characteristics. Packaging selection depends on manufacturing process requirements and volume handling procedures, not electrical performance.