93AA46AT-I/MC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93AA46AT-I/MC 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 actively produced and RoHS3 compliant, making it suitable for embedded systems requiring persistent data storage with minimal pin count. Substitute parts may be required due to inventory constraints, packaging preferences, or interface protocol compatibility needs in system redesigns.

Key Parameters

Parameter	Specification
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	6ms
Supply Voltage Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-VFDFN Exposed Pad (2x3)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the 93AA46AT-I/MC is permissible when the following core parameters remain equivalent:

Memory capacity: 1Kbit
Memory organization: 128 x 8 bit structure
Supply voltage compatibility: 1.8V ~ 5.5V range
Operating temperature range: -40°C ~ 85°C
Clock frequency: 2 MHz operation
RoHS3 compliance and MSL rating: 3 (168 Hours)

The AT93C46DY6-YH-T qualifies as a functional substitute despite differing in memory interface protocol (3-Wire Serial versus Microwire) and package designation (8-UFDFN versus 8-VFDFN), as these represent alternative implementations of equivalent 1Kbit EEPROM functionality. The interface difference requires firmware or hardware protocol adaptation but does not affect core memory performance characteristics.

Parameter Comparison

Parameter	93AA46AT-I/MC	AT93C46DY6-YH-T	Compatibility
Manufacturer	Microchip Technology	Microchip Technology	Identical
Memory Size	1Kbit	1Kbit	Equivalent
Memory Organization	128 x 8	128 x 8, 64 x 16	Compatible
Memory Interface	Microwire	3-Wire Serial	Different Protocol
Clock Frequency	2 MHz	2 MHz	Equivalent
Write Cycle Time	6ms	5ms	Compatible (Faster)
Supply Voltage	1.8V ~ 5.5V	1.8V ~ 5.5V	Equivalent
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Equivalent
Package / Case	8-VFDFN Exposed Pad	8-UFDFN Exposed Pad	Different Package
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
MSL Rating	3 (168 Hours)	3 (168 Hours)	Equivalent

Engineering Selection Recommendations

Selection between the 93AA46AT-I/MC and AT93C46DY6-YH-T depends on system-level interface requirements and PCB layout constraints:

The 93AA46AT-I/MC maintains Microwire protocol compatibility for systems already implementing this serial interface standard. The AT93C46DY6-YH-T provides 3-Wire Serial interface as an alternative, requiring protocol-level firmware modification but offering marginally faster write cycle performance (5ms versus 6ms). Both components meet identical compliance requirements (ROHS3, MSL 3) and operate within the same voltage and temperature specifications.

Package selection between 8-VFDFN and 8-UFDFN variants should be determined by PCB footprint design and available board space. Both packages are surface-mount 8-pin configurations with exposed pads suitable for thermal management in compact applications.

Frequently Asked Questions (FAQ)

Q: Can the AT93C46DY6-YH-T directly replace the 93AA46AT-I/MC without circuit modification?

A: Direct pin-for-pin replacement is not possible due to differing serial interface protocols. The 93AA46AT-I/MC uses Microwire protocol while the AT93C46DY6-YH-T uses 3-Wire Serial protocol. Firmware or hardware interface logic must be adapted to accommodate the protocol difference.

Q: Are the package dimensions compatible between 8-VFDFN and 8-UFDFN?

A: Both packages are 8-pin surface-mount configurations with 2x3mm body dimensions and exposed pads. PCB footprints differ slightly; verify footprint compatibility with your design tools before substitution.

Q: What is the significance of the write cycle time difference (6ms versus 5ms)?

A: The AT93C46DY6-YH-T offers 1ms faster write cycle performance. This difference is negligible for most applications but may provide marginal timing advantages in high-frequency data logging scenarios.

Q: Do both parts meet the same environmental and compliance standards?

A: Yes. Both the 93AA46AT-I/MC and AT93C46DY6-YH-T are ROHS3 compliant, carry MSL rating 3 (168 Hours), and operate across identical voltage (1.8V ~ 5.5V) and temperature (-40°C ~ 85°C) ranges.

Q: Which part should be selected for new designs?

A: Selection should be based on existing system interface architecture. If Microwire protocol is already implemented, the 93AA46AT-I/MC maintains compatibility. For new designs without legacy protocol constraints, either part is acceptable provided the chosen interface protocol is supported by the microcontroller or interface IC.

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