93LC46CT-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC46CT-I/ST is a 1Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for non-volatile data storage applications requiring Microwire serial interface communication. This device operates across a wide supply voltage range of 2.5V to 5.5V and maintains functionality across industrial temperature ranges from -40°C to 85°C. The part is currently in active production status with verified programmability certification from DiGi-Electronics. Substitute parts are identified when equivalent electrical specifications, memory capacity, interface protocol, package form factor, and compliance certifications align with the original component requirements.

Substiute Parts

93LC46CT-I/ST

Microchip TechnologyIn Stock: 1282693LC46CT-I/ST Datasheet

Current PartRFQ

93LC46C-I/ST

Microchip TechnologyIn Stock: 135693LC46C-I/ST Datasheet

DirectRFQ

AT93C46D-TH-T

Microchip TechnologyIn Stock: 5128AT93C46D-TH-T Datasheet

MFR RecommendedRFQ

M93C46-WDW6TP

STMicroelectronicsIn Stock: 57716M93C46-WDW6TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 93LC46CT-I/ST are qualified based on the following critical parameters that determine functional equivalence:

Memory Capacity & Organization: All substitute parts maintain 1Kbit capacity with 128 x 8 or 64 x 16 organization, ensuring data storage compatibility.

Package & Mounting: All substitutes use the 8-TSSOP surface mount package with identical 0.173" width (4.40mm), guaranteeing PCB layout and footprint compatibility.

Supply Voltage Range: All substitutes operate within or encompass the 2.5V to 5.5V range, ensuring power supply compatibility.

Operating Temperature: All substitutes maintain the -40°C to 85°C industrial temperature range.

Compliance & Certification: All substitutes meet ROHS3 compliance and REACH unaffected status, matching regulatory requirements.

Interface Protocol Consideration: The 93LC46CT-I/ST uses Microwire interface. The AT93C46D-TH-T uses 3-Wire Serial interface, which represents a protocol variation requiring firmware or hardware interface adaptation. The M93C46-WDW6TP maintains Microwire protocol compatibility.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitution (Microwire Protocol): The 93LC46C-I/ST and M93C46-WDW6TP maintain full Microwire interface compatibility with the 93LC46CT-I/ST. Both parts are active production status with ROHS3 compliance. The 93LC46C-I/ST is packaged in Tube format, while the M93C46-WDW6TP is supplied in Cut Tape & Digi-Reel format. The M93C46-WDW6TP offers higher inventory availability (57,700 units) compared to the 93LC46C-I/ST (1,313 units).

Protocol-Variant Substitution (3-Wire Serial Interface): The AT93C46D-TH-T operates with 3-Wire Serial interface protocol rather than Microwire, requiring interface adapter circuitry or firmware modification. This part is verified programmable and ROHS3 compliant. Selection of this substitute requires confirmation that the application can accommodate serial protocol conversion.

Programmability Verification: The 93LC46CT-I/ST and AT93C46D-TH-T carry verified DiGi-Electronics programmability certification. The 93LC46C-I/ST does not carry this verification status.

Frequently Asked Questions (FAQ)

Q: Can the 93LC46C-I/ST directly replace the 93LC46CT-I/ST?

A: Yes, the 93LC46C-I/ST is a direct electrical and functional equivalent. Both parts share identical memory capacity, Microwire interface protocol, clock frequency, write cycle time, supply voltage range, and operating temperature specifications. The primary difference is packaging format: the original uses Tape & Reel (TR) while the substitute uses Tube. Both are ROHS3 compliant and active production status. The 93LC46C-I/ST lacks DiGi-Electronics programmability verification, which may be relevant for specific procurement or quality assurance requirements.

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

A: Microwire is a three-wire serial protocol (Chip Select, Clock, Data) used by the 93LC46CT-I/ST and M93C46-WDW6TP. The 3-Wire Serial protocol used by AT93C46D-TH-T operates with different signal timing and sequencing. Direct substitution of AT93C46D-TH-T requires interface adapter logic or firmware modification to translate between protocols. Microwire-compatible parts (93LC46C-I/ST and M93C46-WDW6TP) require no interface changes.

Q: Are all substitute parts available in the same package footprint?

A: Yes, all substitute parts use the 8-TSSOP package with 0.173" width (4.40mm). PCB footprints and land patterns are identical across all four parts, enabling direct physical replacement on the circuit board.

Q: What is the inventory status of each substitute?

A: The 93LC46CT-I/ST has 12,800 units in stock. The 93LC46C-I/ST has 1,313 units. The AT93C46D-TH-T has 5,100 units. The M93C46-WDW6TP has 57,700 units, representing the highest availability among all options.

Q: Do all parts meet the same regulatory compliance standards?

A: Yes, all four parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8542.32.0051. Regulatory compliance is equivalent across all options.

Q: What are the clock frequency differences between substitutes?

A: The 93LC46CT-I/ST and 93LC46C-I/ST operate at 3 MHz clock frequency. The AT93C46D-TH-T and M93C46-WDW6TP operate at 2 MHz. This difference does not affect functional compatibility in most applications, as both frequencies support standard Microwire/3-Wire Serial communication protocols. Applications with strict timing requirements should verify clock frequency compatibility with their interface controller specifications.