93C46B-I/MS EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46B-I/MS is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating at 2 MHz clock frequency. This non-volatile memory device is packaged in 8-MSOP surface mount configuration and is designed for applications requiring low-capacity serial EEPROM storage with standard industrial temperature range operation (-40°C to 85°C). The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative voltage supply ranges are required, when different operating temperature grades are needed, or when alternative packaging formats better suit specific board layout requirements.

Key Parameters

Parameter	Specification
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	64 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	2ms
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package	8-MSOP (0.118", 3.00mm Width)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 93C46B-I/MS is determined by the following critical parameters:

Memory Capacity & Organization: All substitute parts must provide 1Kbit total capacity with compatible memory organization (64 x 16 or 128 x 8 formats are functionally equivalent for this capacity class)
Serial Interface Protocol: Microwire and 3-Wire Serial protocols are compatible at the functional level for 1Kbit EEPROM devices
Clock Frequency: 2 MHz operation is maintained across all listed substitutes
Voltage Supply Range: The original part operates at 4.5V ~ 5.5V; substitutes with wider ranges (2.5V ~ 5.5V or 1.8V ~ 5.5V) are backward compatible
Package Compatibility: 8-MSOP and 8-TSSOP packages are mechanically and electrically compatible for this device class
Temperature Rating: Operating range of -40°C ~ 85°C is maintained; automotive-grade parts with extended range (-40°C ~ 105°C) provide additional margin
Compliance & Certifications: ROHS3 compliance and REACH unaffected status are consistent across all parts

Parameter Comparison

Parameter	93C46B-I/MS	93LC46B-I/MS	AT93C46DY6-YH-T	BR93A46RFVM-WMTR	BR93L46RFVJ-WE2
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Rohm Semiconductor	Rohm Semiconductor
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	64 x 16	64 x 16	128 x 8, 64 x 16	64 x 16	64 x 16
Memory Interface	Microwire	Microwire	3-Wire Serial	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz	2 MHz
Write Cycle Time	2ms	6ms	5ms	5ms	5ms
Voltage Supply Range	4.5V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 85°C
Package / Case	8-MSOP	8-MSOP	8-UFDFN Exposed Pad	8-MSOP	8-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

93LC46B-I/MS (Microchip Technology): Direct substitute with identical memory capacity, organization, and Microwire interface. Offers extended voltage supply range (2.5V ~ 5.5V) compared to the original part. Write cycle time is longer at 6ms versus 2ms. Programmable status verified. Recommended for applications requiring lower supply voltage operation while maintaining identical package format and temperature rating.

AT93C46DY6-YH-T (Microchip Technology): Functionally equivalent 1Kbit EEPROM with 3-Wire Serial interface protocol. Supports dual memory organization (128 x 8 or 64 x 16). Offers widest voltage supply range (1.8V ~ 5.5V) and lowest MSL rating (3, 168 hours) among substitutes. Different package format (8-UFDFN Exposed Pad) requires PCB layout modification. Programmable status verified. Suitable for low-voltage applications with flexible board layout constraints.

BR93A46RFVM-WMTR (Rohm Semiconductor): Equivalent 1Kbit EEPROM with Microwire interface in 8-MSOP package. Automotive-grade component with AEC-Q100 qualification and extended operating temperature range (-40°C ~ 105°C). Voltage supply range 2.5V ~ 5.5V. Tape & Reel packaging. Recommended for automotive and industrial applications requiring extended temperature margin and automotive qualification.

BR93L46RFVJ-WE2 (Rohm Semiconductor): Equivalent 1Kbit EEPROM with Microwire interface. Widest voltage supply range (1.8V ~ 5.5V). Package format is 8-TSSOP, mechanically compatible with 8-MSOP footprint. Cut Tape & Digi-Reel packaging. Programmable status not verified. Suitable for low-voltage applications with standard temperature rating.

Frequently Asked Questions (FAQ)

Q: Can I use 93LC46B-I/MS as a direct replacement for 93C46B-I/MS?

A: Yes. Both parts are Microchip Technology 1Kbit Microwire EEPROM devices in 8-MSOP packaging with identical memory organization (64 x 16) and clock frequency (2 MHz). The 93LC46B-I/MS has a wider voltage supply range (2.5V ~ 5.5V versus 4.5V ~ 5.5V) and longer write cycle time (6ms versus 2ms). If your circuit operates at 4.5V or higher and write cycle timing is not critical, substitution is valid.

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

A: Both are serial communication protocols for EEPROM devices. The AT93C46DY6-YH-T uses 3-Wire Serial protocol while other substitutes use Microwire. For 1Kbit memory capacity, these protocols are functionally compatible at the application level. Interface selection depends on existing circuit design and microcontroller support.

Q: Can I use the automotive-grade BR93A46RFVM-WMTR in a standard industrial application?

A: Yes. Automotive-grade components meet or exceed industrial specifications. The BR93A46RFVM-WMTR provides extended operating temperature range (-40°C ~ 105°C) and AEC-Q100 qualification, offering additional reliability margin for any application. This part is suitable for both automotive and standard industrial use.

Q: Are the 8-MSOP and 8-TSSOP packages interchangeable?

A: Both packages are 8-pin surface mount configurations with compatible pin assignments for this EEPROM device class. However, physical dimensions differ slightly (8-MSOP is 0.118" width, 8-TSSOP is also 0.118" width but different height). PCB footprint design must accommodate the specific package. Consult package datasheets for precise land pattern requirements.

Q: What does MSL rating mean and why does AT93C46DY6-YH-T have MSL 3?

A: Moisture Sensitivity Level (MSL) indicates how long a component can be exposed to moisture before soldering. MSL 1 (unlimited) means no time restriction. MSL 3 (168 hours) means the component must be soldered within 168 hours of moisture exposure. The AT93C46DY6-YH-T's MSL 3 rating requires stricter handling and storage protocols compared to MSL 1 parts.

Q: Which substitute offers the lowest voltage supply requirement?

A: Both AT93C46DY6-YH-T and BR93L46RFVJ-WE2 support 1.8V minimum supply voltage (1.8V ~ 5.5V range), compared to the original part's 4.5V minimum. These parts are suitable for low-power and battery-operated applications.

Q: Is the 93LC46B-I/MS programmable?

A: Yes. The 93LC46B-I/MS has verified programmable status according to DiGi-Electronics testing. The original 93C46B-I/MS and BR93A46RFVM-WMTR, BR93L46RFVJ-WE2 have not been verified for programmability by DiGi-Electronics.

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