AT93C46A-10SC-2.7 Equivalent & Substitute Parts

Part Overview

The AT93C46A-10SC-2.7 is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring a 3-Wire Serial interface with 2 MHz clock frequency and 8-SOIC surface mount packaging. This device operates across a 2.7V to 5.5V supply voltage range and supports 128 x 8 or 64 x 16 memory organization. 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
Supply Voltage Range	2.7V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT93C46A-10SC-2.7 is determined by the following critical parameters:

Memory Capacity & Organization: The substitute must maintain 1Kbit total capacity with compatible memory organization (64 x 16 or 128 x 8 formats).

Package Compatibility: The 8-SOIC surface mount package is mandatory for direct board-level replacement without layout modifications.

Interface Protocol: While the AT93C46A uses 3-Wire Serial protocol, the substitute 93LC46BXT-I/SNG employs Microwire protocol. Both protocols are serial-based and operate at the same 2 MHz clock frequency, enabling functional equivalence in applications where the serial interface timing and command structure are compatible.

Electrical Specifications: Supply voltage range and clock frequency must align to ensure proper operation within existing system parameters.

Memory Interface: 3-Wire Serial and Microwire are both serial protocols suitable for equivalent substitution in this memory category.

Parameter Comparison

Parameter	AT93C46A-10SC-2.7 (Main)	93LC46BXT-I/SNG (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Memory Type	Non-Volatile EEPROM	Non-Volatile EEPROM
Memory Size	1Kbit	1Kbit
Memory Organization	128 x 8, 64 x 16	64 x 16
Memory Interface	3-Wire Serial	Microwire
Clock Frequency	2 MHz	2 MHz
Write Cycle Time	10ms	6ms
Supply Voltage Range	2.7V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package Type	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Packaging Format	Bulk	Tape & Reel (TR)

Engineering Selection Recommendations

The 93LC46BXT-I/SNG serves as the primary substitute for the obsolete AT93C46A-10SC-2.7 based on the following engineering criteria:

Product Status: The substitute is classified as Active, ensuring continued availability and manufacturing support, whereas the main part is Obsolete.

Compliance & Certifications: The 93LC46BXT-I/SNG achieves ROHS3 compliance, meeting modern environmental and regulatory standards. The original AT93C46A-10SC-2.7 is RoHS non-compliant.

Electrical Performance: The substitute provides an extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), supporting broader application environments. Write cycle time is improved at 6ms compared to 10ms.

Package & Interface Compatibility: Both devices utilize identical 8-SOIC surface mount packaging, enabling direct board-level substitution. The Microwire interface of the substitute is functionally equivalent to the 3-Wire Serial protocol for serial EEPROM applications operating at 2 MHz.

Supply Voltage: The substitute supports a marginally lower minimum voltage (2.5V versus 2.7V), maintaining compatibility with existing 2.7V to 5.5V system designs.

Frequently Asked Questions (FAQ)

Q: Can the 93LC46BXT-I/SNG directly replace the AT93C46A-10SC-2.7 on existing PCBs?

A: Yes. Both devices share identical 8-SOIC packaging and pinout compatibility. No PCB layout modifications are required for physical replacement.

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

A: Both are serial communication protocols for EEPROM devices operating at 2 MHz. The 3-Wire Serial interface and Microwire interface are functionally equivalent for memory read/write operations in this device category. Protocol selection depends on system controller compatibility.

Q: Does the substitute support the same memory organization as the main part?

A: The substitute supports 64 x 16 memory organization. The main part supports both 128 x 8 and 64 x 16 formats. Applications using 64 x 16 organization are fully compatible. Applications requiring 128 x 8 organization must verify controller compatibility with the substitute's 64 x 16 format.

Q: What are the compliance advantages of the substitute?

A: The 93LC46BXT-I/SNG is ROHS3 compliant and manufactured to current environmental standards, whereas the AT93C46A-10SC-2.7 is RoHS non-compliant. This is significant for new designs and systems requiring regulatory compliance.

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

A: The substitute operates from -40°C to 85°C compared to the main part's 0°C to 70°C range. This extended range provides design flexibility for applications in wider temperature environments, though it is not required for systems designed for the original 0°C to 70°C specification.

Q: What is the packaging difference between the two parts?

A: The main part is supplied in bulk packaging, while the substitute is supplied in Tape & Reel (TR) format. This affects procurement and assembly processes but does not impact electrical or functional performance.

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