93C46C-I/MS EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46C-I/MS is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating across the industrial temperature range of -40°C to 85°C. This component is classified as Active product status with full RoHS3 compliance. Substitute parts are identified when equivalent memory capacity, interface protocol, package compatibility, and electrical specifications align within acceptable operational parameters for the application.

Key Parameters

Parameter	Specification
Memory Size	1Kbit
Memory Organization	128 x 8, 64 x 16
Memory Interface	Microwire
Clock Frequency	3 MHz
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-MSOP
Write Cycle Time	2ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93C46C-I/MS is determined by the following criteria:

Primary Compatibility Requirements:

Memory capacity: 1Kbit
Memory organization: 128 x 8 or 64 x 16
Memory interface: Microwire or 3-Wire Serial (functionally compatible protocols)
Operating temperature range: Minimum -40°C to 85°C
RoHS3 compliance status
Surface mount package type

Voltage Supply Consideration: The 93C46C-I/MS operates at 4.5V ~ 5.5V. Substitute parts with wider voltage ranges (2.5V ~ 5.5V or 1.8V ~ 5.5V) are compatible as they encompass the original specification range.

Clock Frequency and Write Cycle Time: The original part operates at 3 MHz with 2ms write cycle time. Substitute parts with equal or lower clock frequencies and equal or longer write cycle times maintain functional compatibility.

Parameter Comparison

Parameter	93C46C-I/MS	93LC46C-I/MS	AT93C46DY6-YH-T	M93C46-WDW6TP
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	STMicroelectronics
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	128 x 8, 64 x 16	128 x 8, 64 x 16	128 x 8, 64 x 16	128 x 8, 64 x 16
Memory Interface	Microwire	Microwire	3-Wire Serial	Microwire
Clock Frequency	3 MHz	3 MHz	2 MHz	2 MHz
Voltage Supply Range	4.5V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Write Cycle Time	2ms	6ms	5ms	5ms
Package Type	8-MSOP	8-MSOP	8-UFDFN	8-TSSOP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

93LC46C-I/MS (Microchip Technology) This part maintains identical memory specifications, interface protocol, and operating temperature range as the 93C46C-I/MS. The extended voltage supply range (2.5V ~ 5.5V) provides additional design flexibility. The increased write cycle time (6ms versus 2ms) must be evaluated against application timing requirements. Package compatibility is direct (8-MSOP). Active product status and ROHS3 compliance are maintained.

AT93C46DY6-YH-T (Microchip Technology) This part provides equivalent memory capacity and organization with 3-Wire Serial interface protocol, which is functionally compatible with Microwire applications. The extended voltage supply range (1.8V ~ 5.5V) supports low-power applications. The reduced clock frequency (2 MHz) and increased write cycle time (5ms) require timing validation. Package type differs (8-UFDFN versus 8-MSOP), necessitating PCB layout modification. Active product status and ROHS3 compliance are maintained.

M93C46-WDW6TP (STMicroelectronics) This part maintains Microwire interface protocol and equivalent memory specifications. The extended voltage supply range (2.5V ~ 5.5V) and reduced clock frequency (2 MHz) are compatible with the original specification. The increased write cycle time (5ms) requires application timing assessment. Package type differs (8-TSSOP versus 8-MSOP), requiring PCB footprint modification. Active product status and ROHS3 compliance are maintained.

Frequently Asked Questions (FAQ)

Q: Can 93LC46C-I/MS be used as a direct replacement for 93C46C-I/MS? A: Yes, with timing consideration. Both parts share identical memory capacity, organization, Microwire interface, and operating temperature range. The 93LC46C-I/MS has a longer write cycle time (6ms versus 2ms). Verify that application timing tolerances accommodate this difference.

Q: What is the functional difference between Microwire and 3-Wire Serial interfaces? A: Both are serial communication protocols for EEPROM devices. 3-Wire Serial (used in AT93C46DY6-YH-T) is functionally compatible with Microwire applications. Interface protocol selection depends on microcontroller support and existing firmware implementation.

Q: Are package changes between substitutes acceptable? A: Package changes require PCB layout modification. The 93LC46C-I/MS uses 8-MSOP (direct footprint match). The AT93C46DY6-YH-T uses 8-UFDFN and M93C46-WDW6TP uses 8-TSSOP, both requiring new PCB design. Verify mechanical and electrical compatibility with your board design before implementation.

Q: How does voltage supply range affect part selection? A: The 93C46C-I/MS operates at 4.5V ~ 5.5V. All substitute parts have voltage ranges that encompass this specification. Wider voltage ranges (2.5V ~ 5.5V or 1.8V ~ 5.5V) provide additional design flexibility for multi-voltage systems but do not affect compatibility with 5V applications.

Q: What is the impact of clock frequency differences? A: The 93C46C-I/MS operates at 3 MHz. Substitute parts with 2 MHz clock frequency operate at reduced speed. This affects data transfer rates but maintains protocol compatibility. Application data throughput requirements must be evaluated.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance status, consistent with the original 93C46C-I/MS specification.

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