93C46CT-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46CT-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 at 3 MHz clock frequency with a 4.5V to 5.5V supply voltage range and supports 128 x 8 or 64 x 16 memory organization. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol compatibility, package form factor, and electrical operating parameters that permit direct functional replacement in circuit applications.

Substiute Parts

93C46CT-I/ST

Microchip TechnologyIn Stock: 118593C46CT-I/ST Datasheet

Current PartRFQ

93LC46CT-I/ST

Microchip TechnologyIn Stock: 1282693LC46CT-I/ST Datasheet

MFR RecommendedRFQ

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 93C46CT-I/ST are qualified based on the following substitution criteria:

Primary Matching Parameters:

• Memory capacity: 1Kbit
• Memory organization: 128 x 8 or 64 x 16
• Package form factor: 8-TSSOP surface mount
• Operating temperature range: -40°C ~ 85°C
• RoHS3 compliance status
• Non-volatile EEPROM technology

Interface Protocol Compatibility: Substitutes must support either Microwire or 3-Wire Serial interface protocols, as both are compatible serial communication standards for this memory class.

Voltage Supply Compatibility: Substitute parts must operate within overlapping supply voltage ranges. The 93C46CT-I/ST operates at 4.5V ~ 5.5V. Substitutes with wider voltage ranges (such as 2.5V ~ 5.5V or 1.8V ~ 5.5V) are compatible when the circuit operates within the 4.5V ~ 5.5V window.

Clock Frequency and Write Cycle Time: Substitutes with equal or higher clock frequency and equal or faster write cycle times maintain functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

93LC46CT-I/ST (Microchip Technology): Direct substitute for Microwire interface applications. Maintains identical clock frequency (3 MHz) and memory organization. Extended voltage supply range (2.5V ~ 5.5V) provides broader operational flexibility. Write cycle time of 6ms is longer than the original part; verify timing requirements in the target application. Active product status with ROHS3 compliance and unlimited moisture sensitivity rating.

AT93C46D-TH-T (Microchip Technology): Substitute for applications requiring 3-Wire Serial interface protocol. Operates at 2 MHz clock frequency and 5ms write cycle time. Supports the widest voltage supply range (1.8V ~ 5.5V) among substitute options. Interface protocol differs from Microwire; circuit design must accommodate 3-Wire Serial communication. Active product status with ROHS3 compliance.

M93C46-WDW6TP (STMicroelectronics): Substitute for Microwire interface applications from alternative manufacturer. Operates at 2 MHz clock frequency with 5ms write cycle time. Voltage supply range of 2.5V ~ 5.5V is compatible with 4.5V ~ 5.5V operation window. Active product status with ROHS3 compliance and unlimited moisture sensitivity rating.

All substitute parts maintain identical 8-TSSOP package form factor, surface mount mounting type, and -40°C ~ 85°C operating temperature range. Selection among substitutes depends on interface protocol requirements (Microwire versus 3-Wire Serial), acceptable write cycle time performance, and manufacturer preference.

Frequently Asked Questions (FAQ)

Q: Can 93LC46CT-I/ST replace 93C46CT-I/ST in all applications?

A: 93LC46CT-I/ST is compatible for Microwire interface applications. Both parts operate at 3 MHz and support identical memory organization. The primary difference is write cycle time: 93LC46CT-I/ST requires 6ms versus 2ms for the original part. Verify that the application timing does not require the faster write cycle of the original part.

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

A: Both are serial communication protocols for EEPROM memory devices. Microwire is used by 93C46CT-I/ST, 93LC46CT-I/ST, and M93C46-WDW6TP. 3-Wire Serial is used by AT93C46D-TH-T. Circuit design and firmware implementation differ between protocols. Select based on existing circuit design requirements.

Q: Are all substitute parts in the same 8-TSSOP package?

A: Yes. All parts listed—93C46CT-I/ST, 93LC46CT-I/ST, AT93C46D-TH-T, and M93C46-WDW6TP—use 8-TSSOP surface mount packaging with identical 0.173" width (4.40mm). PCB footprint compatibility is maintained across all options.

Q: Which substitute has the widest voltage supply range?

A: AT93C46D-TH-T supports 1.8V ~ 5.5V, the widest range among all parts. However, the original 93C46CT-I/ST operates at 4.5V ~ 5.5V, so the extended lower voltage capability of AT93C46D-TH-T is only beneficial if the circuit design requires operation below 4.5V.

Q: Can I use M93C46-WDW6TP from STMicroelectronics as a direct replacement?

A: M93C46-WDW6TP is compatible for Microwire interface applications. It maintains the same memory capacity, organization, and 8-TSSOP package. Clock frequency is 2 MHz (versus 3 MHz original) and write cycle time is 5ms (versus 2ms original). Verify that reduced clock frequency and longer write cycle time are acceptable for the target application.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts—93C46CT-I/ST, 93LC46CT-I/ST, AT93C46D-TH-T, and M93C46-WDW6TP—are ROHS3 compliant with moisture sensitivity level 1 (unlimited).