AT93C46-10SC-2.5 Equivalent & Substitute Parts

Part Overview

The AT93C46-10SC-2.5 is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring a 3-Wire Serial interface with a 2 MHz clock frequency. This device is designed for non-volatile data storage applications requiring low-power operation across a 2.5V to 5.5V supply range. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	128 x 8, 64 x 16
Memory Interface	3-Wire Serial
Clock Frequency	2 MHz
Write Cycle Time	10ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the AT93C46-10SC-2.5 is determined by the following critical parameters:

Primary Compatibility Criteria:

Memory size: 1Kbit capacity
Package type: 8-SOIC form factor
Voltage supply range: 2.5V ~ 5.5V compatibility
Memory interface protocol: 3-Wire Serial or Microwire (compatible protocol families)
Clock frequency: 2 MHz operation

Substitution Logic: The AT93C46-10SC-2.5 uses a 3-Wire Serial interface. Microwire protocol devices are functionally compatible as Microwire is a superset of the 3-Wire Serial standard. Substitute parts maintain identical memory capacity (1Kbit), identical package geometry (8-SOIC), and overlapping voltage specifications. The 25LC080A-I/SN represents a higher-capacity alternative (8Kbit) with SPI interface, suitable only when protocol conversion is feasible and increased memory is acceptable.

Parameter Comparison

Parameter	AT93C46-10SC-2.5	M93C46-RMN3TP/K	M93C46-WMN6TP	M93C46-WMN6P	CAV93C46VE-GT3	25LC080A-I/SN
Manufacturer	Microchip Technology	STMicroelectronics	STMicroelectronics	STMicroelectronics	onsemi	Microchip Technology
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit	1Kbit	8Kbit
Memory Organization	128 x 8, 64 x 16	128 x 8, 64 x 16	128 x 8, 64 x 16	128 x 8, 64 x 16	128 x 8	1K x 8
Memory Interface	3-Wire Serial	Microwire	Microwire	Microwire	Microwire	SPI
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz	2 MHz	10 MHz
Write Cycle Time	10ms	5ms	5ms	5ms	—	5ms
Voltage Supply Range	2.5V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Package Type	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	AEC-Q100	—	—	AEC-Q100	—

Engineering Selection Recommendations

Direct Pin-Compatible Substitutes (Microwire Protocol):

The M93C46-WMN6TP and M93C46-WMN6P from STMicroelectronics are the primary recommended substitutes. Both devices maintain 1Kbit capacity, identical 8-SOIC packaging, and Microwire protocol compatibility with the original 3-Wire Serial interface. M93C46-WMN6TP is available in higher inventory (61,180 units) with verified programmability status and is packaged in Cut Tape format. M93C46-WMN6P offers equivalent functionality in Tube packaging. Both achieve ROHS3 compliance and extended operating temperature ranges (-40°C to 85°C) compared to the original specification.

Extended Temperature Alternative:

The M93C46-RMN3TP/K from STMicroelectronics provides automotive-grade qualification (AEC-Q100) with extended temperature operation (-40°C to 125°C) and expanded voltage tolerance (1.8V to 5.5V). This option is suitable for applications requiring enhanced reliability and wider environmental operating conditions.

Automotive-Qualified Option:

The CAV93C46VE-GT3 from onsemi provides AEC-Q100 automotive qualification with identical 1Kbit capacity and Microwire interface. This device supports the widest operating temperature range (-40°C to 125°C) and is appropriate for automotive and industrial applications.

Higher-Capacity Alternative (Protocol Conversion Required):

The 25LC080A-I/SN from Microchip Technology offers 8Kbit capacity with SPI interface. This substitute requires protocol conversion circuitry and is suitable only when increased memory capacity justifies the additional interface complexity. This device is not recommended for direct pin-replacement scenarios.

Frequently Asked Questions (FAQ)

Q: Can the M93C46-WMN6TP directly replace the AT93C46-10SC-2.5 without circuit modifications?

A: Yes. Both devices use compatible serial protocols (Microwire and 3-Wire Serial), maintain identical 1Kbit memory capacity, share the 8-SOIC package footprint, and operate within the 2.5V to 5.5V supply range. Pin assignments and functional behavior are compatible.

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

A: Microwire is a superset protocol that encompasses 3-Wire Serial functionality. Devices designed for Microwire operation are backward-compatible with 3-Wire Serial interface requirements, making Microwire-based substitutes functionally equivalent.

Q: Why is the 25LC080A-I/SN listed as a substitute if it uses SPI instead of Microwire?

A: The 25LC080A-I/SN is included as a higher-capacity alternative for applications where protocol conversion is feasible and increased memory (8Kbit versus 1Kbit) provides system benefits. This substitute requires interface adaptation and is not recommended for direct pin-replacement applications.

Q: Does the M93C46-RMN3TP/K offer advantages over the M93C46-WMN6TP?

A: The M93C46-RMN3TP/K provides automotive-grade qualification (AEC-Q100), extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), and lower minimum supply voltage (1.8V versus 2.5V). These features are beneficial for automotive, industrial, and wide-temperature applications. The M93C46-WMN6TP is preferred for standard commercial applications due to higher inventory availability.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts achieve ROHS3 compliance, whereas the original AT93C46-10SC-2.5 is RoHS non-compliant. This compliance improvement is a significant advantage for new designs and regulatory requirements.

Q: What is the inventory status of recommended substitutes?

A: M93C46-WMN6TP has the highest inventory (61,180 units), followed by CAV93C46VE-GT3 (3,687 units), M93C46-RMN3TP/K (9,459 units), and M93C46-WMN6P (3,485 units). All substitutes are classified as active products with current manufacturing support.

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