93C46CT-I/MS EEPROM Equivalent & Substitute Parts

Part Overview

The 93C46CT-I/MS is a 1Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating at 3 MHz clock frequency. This component is actively produced and widely used in embedded systems requiring small-capacity serial memory storage with low power consumption. Finding equivalent or substitute parts becomes necessary due to supply chain constraints, inventory availability, or specific application requirements that may benefit from alternative interface protocols or voltage specifications while maintaining core memory functionality.

Substiute Parts

93C46CT-I/MS

Microchip TechnologyIn Stock: 84793C46CT-I/MS Datasheet

Current PartRFQ

AT93C46DY6-YH-T

Microchip TechnologyIn Stock: 2392AT93C46DY6-YH-T Datasheet

MFR RecommendedRFQ

M93C46-WDW6TP

STMicroelectronicsIn Stock: 57716M93C46-WDW6TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 93C46CT-I/MS is determined by the following critical parameters:

Memory Capacity & Organization: All substitute parts must provide 1Kbit capacity with 128 x 8 or 64 x 16 organization to ensure functional equivalence in data storage and retrieval.

Serial Interface Protocol: The Microwire interface is the primary communication standard for this part. Substitutes using alternative protocols (such as 3-Wire Serial) require firmware or hardware interface adaptation and are classified as functional alternatives rather than direct pin-compatible replacements.

Operating Voltage Range: The main part operates within 4.5V ~ 5.5V. Substitutes with extended or different voltage ranges (such as 1.8V ~ 5.5V or 2.5V ~ 5.5V) may be used in applications with different power supply architectures.

Clock Frequency & Write Cycle Time: The 3 MHz clock frequency and 2ms write cycle time define performance characteristics. Substitutes with lower clock frequencies (2 MHz) or longer write cycles (5ms) remain functionally compatible but with reduced performance.

Package Compatibility: Surface mount packages (8-TSSOP, 8-MSOP, 8-UFDFN) determine physical board integration. Package differences require PCB layout modifications.

Compliance & Certifications: RoHS3 compliance and MSL ratings ensure environmental and manufacturing process compatibility.

Parameter Comparison

Engineering Selection Recommendations

M93C46-WDW6TP (STMicroelectronics): This substitute maintains Microwire interface compatibility with the 93C46CT-I/MS, ensuring direct firmware and hardware interface compatibility. The 8-TSSOP package matches the main part's available packaging. Clock frequency and write cycle time are reduced (2 MHz, 5ms versus 3 MHz, 2ms), which is acceptable for applications not requiring maximum performance. The extended voltage range (2.5V ~ 5.5V) provides flexibility in power supply design. MSL rating of 1 indicates unlimited moisture sensitivity protection, matching the main part's handling requirements. This substitute is recommended for direct replacement in Microwire-based designs.

AT93C46DY6-YH-T (Microchip Technology): This substitute uses 3-Wire Serial interface protocol instead of Microwire, requiring interface adapter logic or firmware modification. The extended voltage range (1.8V ~ 5.5V) supports low-power applications. The 8-UFDFN package differs from the main part, necessitating PCB layout changes. MSL rating of 3 requires controlled moisture exposure during storage and handling. This substitute is suitable only for applications where interface protocol conversion is feasible or where low-voltage operation is required.

Frequently Asked Questions (FAQ)

Q: Can AT93C46DY6-YH-T be used as a direct replacement for 93C46CT-I/MS without circuit modifications?

A: No. The AT93C46DY6-YH-T uses 3-Wire Serial interface while the 93C46CT-I/MS uses Microwire protocol. Direct pin substitution is not possible. Interface adapter logic or firmware modification is required.

Q: What are the key differences between M93C46-WDW6TP and 93C46CT-I/MS?

A: Both use Microwire interface and are pin-compatible in 8-TSSOP packaging. The M93C46-WDW6TP operates at 2 MHz (versus 3 MHz) with 5ms write cycle time (versus 2ms). Voltage range is 2.5V ~ 5.5V (versus 4.5V ~ 5.5V). These differences do not affect functional compatibility in standard applications.

Q: Does package difference between 8-MSOP and 8-TSSOP affect substitution?

A: Package differences require PCB layout modifications including trace routing and component placement adjustments. Electrical functionality remains equivalent if the interface protocol matches.

Q: Are all three parts RoHS3 compliant?

A: Yes. All three parts (93C46CT-I/MS, AT93C46DY6-YH-T, and M93C46-WDW6TP) are ROHS3 compliant and REACH unaffected.

Q: What does MSL rating difference mean for component handling?

A: MSL 1 (93C46CT-I/MS, M93C46-WDW6TP) indicates unlimited moisture sensitivity protection. MSL 3 (AT93C46DY6-YH-T) requires controlled moisture exposure for 168 hours maximum. MSL 3 components require more stringent storage and handling procedures.

Q: Can voltage range differences affect circuit design?

A: The 93C46CT-I/MS requires 4.5V ~ 5.5V supply. Substitutes with lower minimum voltage (AT93C46DY6-YH-T at 1.8V, M93C46-WDW6TP at 2.5V) can operate in the main part's voltage range but enable additional low-voltage applications. Designs must still respect the main part's minimum voltage requirement if used as a direct replacement.