93AA46B-I/MS EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93AA46B-I/MS is a 1Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating across a wide voltage range of 1.8V to 5.5V. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when equivalent functionality from alternative manufacturers is preferred for supply chain optimization.

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	6ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package Type	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 93AA46B-I/MS is determined by the following critical parameters:

Memory Capacity & Organization: All substitutes must provide 1Kbit storage with compatible data organization (64 x 16 or 128 x 8 formats)
Serial Interface Protocol: Microwire or 3-Wire Serial protocols are functionally compatible for this application
Clock Frequency: 2 MHz operation is required
Voltage Supply Range: 1.8V ~ 5.5V compatibility is mandatory
Operating Temperature Range: -40°C ~ 85°C specification must be met
Package Compatibility: Surface mount packages (8-MSOP, 8-TSSOP, 8-UFDFN) are mechanically and electrically interchangeable
Compliance Standards: ROHS3 compliance and EAR99 classification must be maintained

Substitutes are grouped by packaging format (Tube vs. Cut Tape) and interface protocol variant (Microwire vs. 3-Wire Serial), with all alternatives meeting the core electrical and thermal specifications.

Parameter Comparison

Parameter	93AA46B-I/MS	93AA46BT-I/MS	AT93C46DY6-YH-T	BR93L46RFVJ-WE2
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Rohm Semiconductor
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	64 x 16	64 x 16	128 x 8, 64 x 16	64 x 16
Memory Interface	Microwire	Microwire	3-Wire Serial	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz
Write Cycle Time	6ms	6ms	5ms	5ms
Voltage Supply	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-MSOP	8-MSOP	8-UFDFN	8-TSSOP
Packaging Format	Tube	Cut Tape (CT)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

93AA46BT-I/MS (Microchip Technology): Direct substitute with identical electrical specifications and Microwire interface. Differs only in packaging format (Cut Tape vs. Tube). Suitable for high-volume manufacturing processes requiring tape-and-reel delivery. Product status is Active with verified programmability.

AT93C46DY6-YH-T (Microchip Technology): Manufacturer-recommended alternative featuring 3-Wire Serial interface protocol instead of Microwire. Provides equivalent 1Kbit capacity with improved write cycle time (5ms vs. 6ms). Package format is 8-UFDFN with exposed pad. MSL rating of 3 requires controlled storage conditions (168 hours maximum). Product status is Active with verified programmability.

BR93L46RFVJ-WE2 (Rohm Semiconductor): Cross-manufacturer substitute maintaining Microwire interface and identical electrical specifications. Packaged in 8-TSSOP format. Write cycle time is 5ms. Product status is Active. MSL rating is 1 (Unlimited). Programmability is not verified by DiGi-Electronics.

All substitutes maintain ROHS3 compliance, EAR99 classification, and identical operating temperature and voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can 93AA46BT-I/MS be used as a direct replacement for 93AA46B-I/MS?

A: Yes. Both parts are manufactured by Microchip Technology with identical electrical specifications, memory capacity, interface protocol, and operating parameters. The only difference is packaging format: 93AA46B-I/MS is supplied in Tube format, while 93AA46BT-I/MS is supplied in Cut Tape (CT) format. Selection depends on manufacturing process requirements.

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

A: Both are serial communication protocols for EEPROM memory access. Microwire is a three-wire protocol (Chip Select, Clock, Data In/Out). 3-Wire Serial is functionally equivalent for this 1Kbit memory application. AT93C46DY6-YH-T uses 3-Wire Serial protocol and is electrically compatible with Microwire-based designs when interface firmware supports both protocols.

Q: Is AT93C46DY6-YH-T suitable for high-humidity environments?

A: AT93C46DY6-YH-T has MSL rating of 3, requiring storage at controlled humidity conditions (168 hours maximum exposure). For unlimited humidity tolerance, use 93AA46BT-I/MS or BR93L46RFVJ-WE2, both rated MSL 1.

Q: Can BR93L46RFVJ-WE2 from Rohm Semiconductor replace the Microchip part?

A: Yes. BR93L46RFVJ-WE2 maintains identical memory capacity (1Kbit), interface protocol (Microwire), voltage range (1.8V ~ 5.5V), operating temperature (-40°C ~ 85°C), and compliance standards (ROHS3, EAR99). Package format differs (8-TSSOP vs. 8-MSOP), requiring PCB layout verification.

Q: Which substitute has the fastest write cycle time?

A: Both AT93C46DY6-YH-T and BR93L46RFVJ-WE2 provide 5ms write cycle time, compared to 6ms for the original 93AA46B-I/MS. This represents a 16.7% improvement in write performance.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitutes (93AA46BT-I/MS, AT93C46DY6-YH-T, BR93L46RFVJ-WE2) are ROHS3 compliant and maintain EAR99 export classification.

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