AT93C46A-10SC-2.5 Equivalent & Substitute Parts

Part Overview

The AT93C46A-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 voltage range. The component is mounted in an 8-SOIC package and operates within the industrial temperature range of 0°C to 70°C.

The AT93C46A-10SC-2.5 is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity, ensure supply chain reliability, and access components with extended product lifecycles and improved compliance certifications.

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)
Mounting Type	Surface Mount
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution of the AT93C46A-10SC-2.5 is determined by the following critical parameters:

Memory Capacity: 1Kbit capacity requirement
Package Compatibility: 8-SOIC form factor with identical 0.154" (3.90mm) width
Supply Voltage Range: 2.5V to 5.5V compatibility
Serial Interface Protocol: 3-Wire Serial or Microwire protocol support
Clock Frequency: 2 MHz operation capability
Mounting Technology: Surface mount configuration

The 93LC46BXT-I/SNG qualifies as a direct substitute based on matching memory capacity, identical package geometry, overlapping voltage specifications, compatible serial interface protocol (Microwire), and equivalent clock frequency. The substitute maintains functional and physical compatibility while offering improved product status and compliance characteristics.

Parameter Comparison

Parameter	AT93C46A-10SC-2.5	93LC46BXT-I/SNG
Memory Type	Non-Volatile EEPROM	Non-Volatile EEPROM
Memory Size	1Kbit	1Kbit
Memory Interface	3-Wire Serial	Microwire
Clock Frequency	2 MHz	2 MHz
Write Cycle Time	10ms	6ms
Voltage Supply Range	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	Non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 93LC46BXT-I/SNG is the qualified substitute for the AT93C46A-10SC-2.5 based on the following engineering criteria:

Product Status: The substitute component maintains active product status, ensuring continued availability and manufacturer support. The original part is obsolete, creating supply chain risk.

Compliance Certifications: The 93LC46BXT-I/SNG is ROHS3 compliant, meeting current environmental and regulatory requirements. The original part is non-compliant with modern standards.

Functional Compatibility: Both components share identical memory capacity (1Kbit), package geometry (8-SOIC), supply voltage range (2.5V to 5.5V), and clock frequency (2 MHz). The Microwire interface of the substitute is protocol-compatible with 3-Wire Serial applications.

Performance Characteristics: The substitute offers improved write cycle time (6ms versus 10ms) and extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), providing enhanced operational flexibility.

Frequently Asked Questions (FAQ)

Q: Can the 93LC46BXT-I/SNG directly replace the AT93C46A-10SC-2.5 without circuit modifications?

A: The 93LC46BXT-I/SNG is physically and functionally compatible with the AT93C46A-10SC-2.5. Both components use identical 8-SOIC packaging and share the same pinout. The Microwire serial interface is protocol-compatible with 3-Wire Serial applications. No circuit modifications are required for substitution.

Q: What are the key differences between the original and substitute parts?

A: The primary differences are product status (obsolete versus active), RoHS compliance (non-compliant versus ROHS3 compliant), write cycle time (10ms versus 6ms), and operating temperature range (0°C to 70°C versus -40°C to 85°C). All critical electrical and mechanical parameters remain equivalent.

Q: Is the extended temperature range of the substitute part beneficial?

A: The extended operating temperature range (-40°C to 85°C) of the 93LC46BXT-I/SNG provides operational capability beyond the original specification (0°C to 70°C). This expanded range is beneficial for applications requiring operation in extreme environmental conditions.

Q: Does the improved write cycle time of the substitute affect system performance?

A: The 93LC46BXT-I/SNG features a faster write cycle time (6ms) compared to the original part (10ms). This improvement does not create compatibility issues and may enhance overall system performance in write-intensive applications.

Q: Are there packaging or supply chain considerations for the substitute part?

A: The 93LC46BXT-I/SNG is supplied in Tape & Reel (TR) packaging format, which is standard for high-volume production environments. Inventory availability is confirmed at 1023 pieces in new original condition, ensuring reliable supply chain access.

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