AT93C66W-10SC-2.7 Equivalent & Substitute Parts

Part Overview

The AT93C66W-10SC-2.7 is a 4Kbit 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 is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and production continuity. The part operates across a 2.7V to 5.5V supply voltage range with a 10ms write cycle time and supports memory organization of 512 x 8 or 256 x 16 configurations.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Format	EEPROM
Memory Organization	512 x 8, 256 x 16
Memory Interface	3-Wire Serial
Clock Frequency	2 MHz
Write Cycle Time	10ms
Voltage Supply Range	2.7V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the AT93C66W-10SC-2.7 is based on the following critical parameters that must align across alternatives:

Memory capacity: 4Kbit EEPROM
Memory organization: 512 x 8 or 256 x 16
Clock frequency: 2 MHz
Package type: 8-SOIC with identical physical dimensions
Surface mount configuration
Supply voltage compatibility within specified ranges

The identified substitutes are STMicroelectronics M93C66 series devices (M93C66-WMN6P and M93C66-WMN6TP), which maintain identical memory capacity, organization, clock frequency, and package specifications. These parts utilize Microwire interface protocol, which is functionally compatible with the 3-Wire Serial interface of the original part, as both employ the same pin configuration and signal timing for the 8-SOIC package. The substitutes operate across an extended supply voltage range (2.5V ~ 5.5V) and feature improved write cycle performance (5ms versus 10ms).

Parameter Comparison

Parameter	AT93C66W-10SC-2.7	M93C66-WMN6P	M93C66-WMN6TP
Manufacturer	Microchip Technology	STMicroelectronics	STMicroelectronics
Memory Size	4Kbit	4Kbit	4Kbit
Memory Format	EEPROM	EEPROM	EEPROM
Memory Organization	512 x 8, 256 x 16	512 x 8, 256 x 16	512 x 8, 256 x 16
Clock Frequency	2 MHz	2 MHz	2 MHz
Write Cycle Time	10ms	5ms	5ms
Voltage Supply Range	2.7V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The M93C66-WMN6TP is the primary recommended substitute for the AT93C66W-10SC-2.7. This part is manufactured by STMicroelectronics with active product status, ensuring long-term availability and supply chain stability. The M93C66-WMN6TP achieves ROHS3 compliance, meeting modern environmental and regulatory requirements that the obsolete AT93C66W-10SC-2.7 does not satisfy. With 35,100 units in stock and availability in Cut Tape and Digi-Reel packaging formats, this substitute provides production-ready supply for volume applications.

The M93C66-WMN6P serves as a secondary alternative, also manufactured by STMicroelectronics with active status and ROHS3 compliance. This variant is packaged in Tube format with 1,543 units available. Both STMicroelectronics substitutes feature extended operating temperature range (-40°C to 85°C) and improved write cycle performance (5ms), providing enhanced performance margins over the original part.

Frequently Asked Questions (FAQ)

Q: Are the M93C66-WMN6P and M93C66-WMN6TP electrically identical?

A: Both parts are electrically identical. The difference lies in packaging format: M93C66-WMN6P is supplied in Tube packaging, while M93C66-WMN6TP is supplied in Cut Tape and Digi-Reel formats. Selection depends on production volume and assembly line requirements.

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

A: Both interfaces employ identical pin configurations and signal protocols within the 8-SOIC package. The terminology reflects different industry naming conventions for the same serial communication standard. Pin-for-pin compatibility is maintained.

Q: Can the substitute parts operate at 2.7V minimum supply voltage?

A: The M93C66 substitutes specify a minimum supply voltage of 2.5V, which is lower than the AT93C66W-10SC-2.7 minimum of 2.7V. Both parts operate within the 2.7V to 5.5V range of the original device, ensuring compatibility with existing power supply designs.

Q: What is the significance of the improved 5ms write cycle time in the substitutes?

A: The M93C66 series reduces write cycle time from 10ms to 5ms, providing faster memory programming operations. This improvement is backward compatible; applications designed for 10ms write cycles will function correctly with the faster 5ms specification.

Q: Are there any PCB layout considerations when substituting these parts?

A: No layout modifications are required. Both the original and substitute parts use identical 8-SOIC package dimensions (0.154" width, 3.90mm). Existing PCB designs and footprints are directly compatible without redesign.

Q: What is the impact of the extended operating temperature range?

A: The substitutes support -40°C to 85°C operation, compared to the original 0°C to 70°C range. This extended range provides greater flexibility for applications in industrial and automotive environments without requiring design changes.

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