93C46BT-I/MS EEPROM Equivalent & Substitute Parts

Part Overview

The 93C46BT-I/MS is a 1Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 2 MHz clock frequency in an 8-MSOP surface mount package. This device is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are necessary when the primary part becomes unavailable due to inventory constraints, supply chain disruptions, or when alternative packaging or voltage specifications better suit specific application requirements while maintaining functional compatibility.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution validity for the 93C46BT-I/MS is determined by the following critical parameters:

Core Functional Requirements:

Memory size: 1Kbit (non-negotiable)
Memory interface: Microwire protocol compatibility
Clock frequency: 2 MHz operation
Memory organization: 64 x 16 bit structure
Package footprint: 8-MSOP or compatible pinout

Electrical Compatibility Criteria:

Voltage supply range must encompass or exceed the application's operating voltage (4.5V ~ 5.5V minimum requirement)
Operating temperature range must cover -40°C ~ 85°C minimum
Write cycle time specifications must be acceptable for application timing requirements

Compliance & Quality:

RoHS3 compliance required
MSL rating of 1 (Unlimited) preferred for standard applications
Product status: Active

Substitute parts are grouped into two categories: direct Microchip Technology equivalents with identical or superior voltage specifications, and cross-manufacturer alternatives from Rohm Semiconductor with automotive-grade qualification options.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Memory Interface	Clock Frequency	Voltage Supply	Operating Temp	Write Cycle Time	Package	Product Status
93C46BT-I/MS	Microchip Technology	1Kbit	Microwire	2 MHz	4.5V ~ 5.5V	-40°C ~ 85°C	2ms	8-MSOP	Active
93AA46BT-I/MS	Microchip Technology	1Kbit	Microwire	2 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	6ms	8-MSOP	Active
93LC46BT-I/MS	Microchip Technology	1Kbit	Microwire	2 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	6ms	8-MSOP	Active
AT93C46DY6-YH-T	Microchip Technology	1Kbit	3-Wire Serial	2 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-Mini Map (2x3)	Active
BR93A46RFVM-WMTR	Rohm Semiconductor	1Kbit	Microwire	2 MHz	2.5V ~ 5.5V	-40°C ~ 105°C	5ms	8-MSOP	Active
BR93L46RFVJ-WE2	Rohm Semiconductor	1Kbit	Microwire	2 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active

Engineering Selection Recommendations

Primary Substitutes (Microchip Technology):

The 93AA46BT-I/MS and 93LC46BT-I/MS are direct functional equivalents with extended voltage supply ranges (1.8V ~ 5.5V and 2.5V ~ 5.5V respectively). Both maintain Microwire interface compatibility, 2 MHz operation, and identical package footprint. Selection between these depends on minimum supply voltage requirements: 93AA46BT-I/MS supports lower voltage applications (1.8V minimum), while 93LC46BT-I/MS requires 2.5V minimum. Write cycle time increases to 6ms for both, which must be verified as acceptable for application timing constraints.

Alternative Interface Option (Microchip Technology):

The AT93C46DY6-YH-T provides 1Kbit capacity with 3-Wire Serial interface instead of Microwire protocol. This part is suitable only if the application circuit supports 3-Wire Serial communication. Package format differs (8-Mini Map vs. 8-MSOP), requiring PCB layout modification. MSL rating of 3 (168 hours) indicates moisture sensitivity requirements during storage and handling.

Cross-Manufacturer Alternatives (Rohm Semiconductor):

BR93A46RFVM-WMTR and BR93L46RFVJ-WE2 maintain Microwire interface and 1Kbit capacity. BR93A46RFVM-WMTR extends operating temperature to 105°C with AEC-Q100 automotive qualification, suitable for high-temperature applications. BR93L46RFVJ-WE2 supports 1.8V minimum supply voltage with standard -40°C ~ 85°C temperature range. Both feature 5ms write cycle time and ROHS3 compliance.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can 93AA46BT-I/MS replace 93C46BT-I/MS in all applications?

A: Functional replacement is valid if the application can tolerate 6ms write cycle time (versus 2ms original specification) and if the minimum supply voltage requirement is 1.8V or higher. The extended voltage range of 93AA46BT-I/MS (1.8V ~ 5.5V) covers the original 4.5V ~ 5.5V requirement. Verify write cycle timing constraints in your application before substitution.

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

A: Microwire and 3-Wire Serial are distinct serial communication protocols. The AT93C46DY6-YH-T uses 3-Wire Serial interface, while the original 93C46BT-I/MS uses Microwire. These protocols are not interchangeable without circuit redesign. Substitution with AT93C46DY6-YH-T requires verification that your application supports 3-Wire Serial communication.

Q: Are Rohm Semiconductor parts (BR93A46RFVM-WMTR, BR93L46RFVJ-WE2) pin-compatible with Microchip parts?

A: Both Rohm parts maintain 8-pin MSOP/TSSOP package footprints compatible with the original 93C46BT-I/MS pinout. Verify pinout diagrams for your specific application to confirm signal alignment. Both parts support Microwire interface protocol.

Q: Which substitute part supports the widest voltage range?

A: The 93AA46BT-I/MS and BR93L46RFVJ-WE2 both support 1.8V ~ 5.5V supply voltage range, the widest among available substitutes. Selection depends on package preference (8-MSOP vs. 8-TSSOP) and write cycle time tolerance (6ms vs. 5ms).

Q: Is automotive-grade qualification required for my application?

A: Automotive qualification (AEC-Q100) is provided only by BR93A46RFVM-WMTR. This qualification is necessary for automotive applications subject to AEC standards. Standard industrial applications do not require this certification. Verify your application requirements before selecting this part.

Q: What does MSL 1 (Unlimited) versus MSL 3 (168 Hours) mean for component handling?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity restrictions during storage and handling. MSL 3 (168 Hours) requires the component to be used within 168 hours of package opening under controlled humidity conditions. The AT93C46DY6-YH-T with MSL 3 requires stricter moisture control during assembly. Standard industrial applications typically prefer MSL 1 components for simplified logistics.

Q: Can I use BR93A46RFVM-WMTR in applications requiring -40°C ~ 85°C operation?

A: Yes. BR93A46RFVM-WMTR supports -40°C ~ 105°C operating temperature range, which exceeds the -40°C ~ 85°C requirement. This part is suitable for applications requiring standard temperature range operation and provides additional thermal margin for high-temperature environments.

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