93LC46CT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC46CT-E/ST is a 1Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for non-volatile data storage applications requiring Microwire serial interface communication. This device operates across a wide supply voltage range of 2.5V to 5.5V and supports industrial temperature ranges from -40°C to 125°C. The component is currently in active production status and is ROHS3 compliant, making it suitable for modern electronic applications requiring environmental compliance. Substitute parts are identified when equivalent electrical specifications, memory capacity, interface protocol, and physical packaging are maintained across alternative manufacturers.

Key Parameters

Parameter	Specification
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	128 x 8, 64 x 16
Memory Interface	Microwire
Clock Frequency	3 MHz
Supply Voltage Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Write Cycle Time	6ms
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC46CT-E/ST is determined by strict equivalence across the following critical parameters:

Memory capacity and organization must remain at 1Kbit with 128 x 8 or 64 x 16 configuration to ensure software and firmware compatibility without modification. The Microwire serial interface is mandatory for protocol compatibility with existing circuit designs. Supply voltage range of 2.5V to 5.5V must be maintained to support the same power supply configurations. The 8-TSSOP surface mount package with 0.173" width (4.40mm) is required for physical PCB layout compatibility. Operating temperature range, write cycle time, and clock frequency specifications define the performance envelope within which substitutes must operate. RoHS3 compliance and REACH unaffected status ensure regulatory and environmental compliance equivalence.

The M93C46-WDW6TP from STMicroelectronics qualifies as a direct substitute based on matching memory type, capacity, organization, Microwire interface, supply voltage range, package configuration, and compliance certifications. Minor variations in clock frequency (2 MHz versus 3 MHz) and write cycle time (5ms versus 6ms) represent performance improvements rather than incompatibilities, as the substitute operates within the same electrical and mechanical constraints.

Parameter Comparison

Parameter	93LC46CT-E/ST (Microchip)	M93C46-WDW6TP (STMicroelectronics)
Memory Type	Non-Volatile EEPROM	Non-Volatile EEPROM
Memory Size	1Kbit	1Kbit
Memory Organization	128 x 8, 64 x 16	128 x 8, 64 x 16
Memory Interface	Microwire	Microwire
Clock Frequency	3 MHz	2 MHz
Supply Voltage Range	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)	8-TSSOP (0.173", 4.40mm Width)
Write Cycle Time	6ms	5ms
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Both the 93LC46CT-E/ST and M93C46-WDW6TP maintain active product status with full ROHS3 compliance and REACH unaffected certification, ensuring regulatory equivalence for new designs and production environments. The M93C46-WDW6TP demonstrates verified DiGi-Electronics programmability status, confirming compatibility with standard programming and verification equipment. Selection between these parts should be based on application-specific temperature requirements: the 93LC46CT-E/ST supports extended temperature operation to 125°C, while the M93C46-WDW6TP operates to 85°C. For applications requiring maximum temperature margin or industrial extended-range operation, the 93LC46CT-E/ST is appropriate. For standard commercial and industrial applications within -40°C to 85°C, the M93C46-WDW6TP provides equivalent functionality with improved write cycle performance. Both parts are suitable for direct PCB substitution without layout modification due to identical package specifications and pin configurations.

Frequently Asked Questions (FAQ)

Q: Can the M93C46-WDW6TP replace the 93LC46CT-E/ST in existing designs?

A: Yes, the M93C46-WDW6TP is a direct substitute for applications operating within -40°C to 85°C temperature range. Both parts share identical memory capacity, Microwire interface protocol, supply voltage specifications, and 8-TSSOP package configuration. No circuit modification or firmware changes are required for substitution.

Q: What is the significance of the clock frequency difference between 3 MHz and 2 MHz?

A: The 93LC46CT-E/ST operates at 3 MHz maximum clock frequency, while the M93C46-WDW6TP operates at 2 MHz. Both frequencies are compatible with standard Microwire protocol implementations. The lower clock frequency of the substitute does not create incompatibility; it represents a conservative specification that maintains full protocol compliance.

Q: Are there temperature limitations when substituting the M93C46-WDW6TP?

A: The M93C46-WDW6TP is rated for -40°C to 85°C operation, compared to the 93LC46CT-E/ST rated to 125°C. Applications requiring operation above 85°C must use the 93LC46CT-E/ST. For standard industrial and commercial temperature ranges, the M93C46-WDW6TP is fully qualified.

Q: Do both parts require identical PCB layout considerations?

A: Yes. Both the 93LC46CT-E/ST and M93C46-WDW6TP use the 8-TSSOP package with identical 0.173" width (4.40mm) and pin configuration. PCB footprints, trace routing, and component placement are directly compatible without modification.

Q: What compliance certifications apply to both substitute parts?

A: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring environmental and regulatory equivalence for applications subject to these standards.

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