93C46B/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46B/ST is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 2 MHz clock frequency in an 8-TSSOP surface mount package. This non-volatile memory device is designed for applications requiring low-capacity data storage with serial communication. The part is currently in active production status. Substitute parts may be required due to inventory availability, extended temperature range requirements, or alternative interface protocol compatibility.

Key Parameters

Parameter	Value
Memory Size	1Kbit
Memory Organization	64 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-TSSOP
Write Cycle Time	2ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93C46B/ST is determined by the following critical parameters: memory size (1Kbit), memory organization (64 x 16), clock frequency (2 MHz), package type (8-TSSOP), and interface protocol compatibility. Parts meeting these core specifications are considered functionally equivalent. Secondary considerations include voltage supply range compatibility, operating temperature range, and write cycle time specifications. Parts with extended temperature ranges (-40°C ~ 85°C) or wider supply voltage ranges (2.5V ~ 5.5V or 1.8V ~ 5.5V) are backward compatible with the original specification. Interface protocol variations (Microwire versus 3-Wire Serial) represent functional differences that must be evaluated against application requirements.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Interface	Clock Frequency	Voltage Supply	Operating Temperature	Package	Write Cycle Time	Product Status
93C46B/ST	Microchip Technology	1Kbit	Microwire	2 MHz	4.5V ~ 5.5V	0°C ~ 70°C	8-TSSOP	2ms	Active
93C46B-I/ST	Microchip Technology	1Kbit	Microwire	2 MHz	4.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	2ms	Active
93LC46B-I/ST	Microchip Technology	1Kbit	Microwire	2 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	6ms	Active
AT93C46E-TH-B	Microchip Technology	1Kbit	3-Wire Serial	2 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	Active
BR93L46RFV-WE2	Rohm Semiconductor	1Kbit	Microwire	2 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-LSSOP	5ms	Not For New Designs

Engineering Selection Recommendations

93C46B-I/ST is the primary direct substitute for 93C46B/ST. Both parts maintain identical memory specifications, interface protocol, and package type. The 93C46B-I/ST provides extended operating temperature range (-40°C ~ 85°C) compared to the original specification (0°C ~ 70°C), making it suitable for industrial and automotive applications requiring wider temperature tolerance. Both parts are ROHS3 compliant and in active production.

93LC46B-I/ST is a compatible substitute with extended voltage supply range (2.5V ~ 5.5V) and operating temperature range (-40°C ~ 85°C). This part accommodates low-voltage applications while maintaining Microwire interface compatibility. The write cycle time specification is 6ms compared to 2ms for the original part, which may impact applications with strict timing requirements.

AT93C46E-TH-B is functionally equivalent in memory capacity and clock frequency but implements 3-Wire Serial interface protocol instead of Microwire. This part offers the widest voltage supply range (1.8V ~ 5.5V) and extended temperature range (-40°C ~ 85°C). Selection of this part requires confirmation that the application circuit supports 3-Wire Serial protocol communication.

BR93L46RFV-WE2 is a Rohm Semiconductor alternative maintaining Microwire interface and identical memory specifications. This part is marked "Not For New Designs" and should be selected only when existing inventory constraints or legacy system requirements necessitate its use. The package designation differs slightly (8-LSSOP versus 8-TSSOP), requiring physical footprint verification.

Frequently Asked Questions (FAQ)

Q: Can 93C46B-I/ST directly replace 93C46B/ST in existing designs? A: Yes. Both parts share identical memory size, organization, interface protocol, clock frequency, and package type. The 93C46B-I/ST provides extended operating temperature range, making it a backward-compatible upgrade.

Q: What is the primary difference between Microwire and 3-Wire Serial interfaces? A: Microwire and 3-Wire Serial are distinct serial communication protocols. The AT93C46E-TH-B implements 3-Wire Serial protocol, while 93C46B/ST, 93C46B-I/ST, and 93LC46B-I/ST implement Microwire protocol. Circuit-level interface compatibility must be verified before substitution.

Q: Is 93LC46B-I/ST suitable for 5V applications? A: Yes. The 93LC46B-I/ST voltage supply range is 2.5V ~ 5.5V, encompassing the original part's 4.5V ~ 5.5V specification. This part is compatible with 5V system designs.

Q: Why does BR93L46RFV-WE2 have "Not For New Designs" status? A: This designation indicates the manufacturer has discontinued active development and recommends alternative parts for new applications. Existing designs may continue using this part, but new projects should select from active production alternatives.

Q: Does package size difference between 8-TSSOP and 8-LSSOP affect substitution? A: Yes. While both are 8-pin surface mount packages with similar pitch, physical dimensions differ. PCB footprint compatibility must be verified before selecting BR93L46RFV-WE2.

Q: What write cycle time difference exists between substitute parts? A: The original 93C46B/ST specifies 2ms write cycle time. The 93LC46B-I/ST specifies 6ms, while AT93C46E-TH-B and BR93L46RFV-WE2 specify 5ms. Applications with timing-critical write operations must account for these differences.

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