AT93C56W-10SC-2.7 Equivalent & Substitute Parts

Part Overview

The AT93C56W-10SC-2.7 is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring a 3-Wire Serial interface with 2 MHz clock frequency. This component is classified as Obsolete, which necessitates identification of active equivalent parts for ongoing design requirements and production continuity. The part is housed in an 8-SOIC surface mount package with a supply voltage range of 2.7V to 5.5V and operates across the industrial temperature range of 0°C to 70°C.

Key Parameters

Parameter	Value
Memory Size	2Kbit
Memory Organization	256 x 8, 128 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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT93C56W-10SC-2.7 is based on the following critical parameters:

Memory Capacity: 2Kbit (256 x 8 or 128 x 16 organization)
Package Compatibility: 8-SOIC form factor with identical 0.154" (3.90mm) width
Interface Protocol: Serial communication capability (3-Wire Serial or Microwire)
Voltage Compatibility: Supply voltage range must encompass or overlap with 2.7V ~ 5.5V
Surface Mount Technology: Identical mounting type for PCB assembly compatibility

The substitute parts listed below are manufactured by STMicroelectronics under the M93C56 base product number. These parts maintain identical memory capacity, organization, and package specifications. The primary differences are in interface protocol (Microwire vs. 3-Wire Serial), clock frequency capability, write cycle time, and operating temperature range. All substitute parts are classified as Active products with current manufacturing status.

Parameter Comparison

Parameter	AT93C56W-10SC-2.7	M93C56-RMN6TP	M93C56-WMN6P	M93C56-WMN6TP
Manufacturer	Microchip Technology	STMicroelectronics	STMicroelectronics	STMicroelectronics
Memory Size	2Kbit	2Kbit	2Kbit	2Kbit
Memory Organization	256 x 8, 128 x 16	256 x 8, 128 x 16	256 x 8, 128 x 16	256 x 8, 128 x 16
Memory Interface	3-Wire Serial	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	1 MHz	2 MHz	2 MHz
Write Cycle Time	10ms	5ms	5ms	5ms
Voltage Supply Range	2.7V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Option	Not specified	Tape & Reel (TR)	Tube	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Product Status Consideration: The AT93C56W-10SC-2.7 is classified as Obsolete. All three substitute parts (M93C56-RMN6TP, M93C56-WMN6P, M93C56-WMN6TP) are Active products with current manufacturing support from STMicroelectronics, ensuring long-term availability and supply chain stability.

Compliance Status: The original part is RoHS non-compliant. All substitute parts are ROHS3 Compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Interface Protocol Compatibility: The original part uses 3-Wire Serial interface, while all substitute parts use Microwire protocol. Both protocols are serial communication standards for EEPROM devices. Design implementation must account for this protocol difference in firmware or hardware interface logic.

Voltage Supply Range: The original part operates from 2.7V to 5.5V. M93C56-RMN6TP supports 1.8V to 5.5V (broader low-voltage range), while M93C56-WMN6P and M93C56-WMN6TP support 2.5V to 5.5V (narrower low-voltage range). Selection depends on minimum supply voltage requirements of the target application.

Operating Temperature Range: The original part operates from 0°C to 70°C (commercial range). All substitute parts operate from -40°C to 85°C (industrial range), providing extended temperature capability suitable for broader environmental conditions.

Packaging and Availability: M93C56-WMN6TP offers the highest inventory availability (41,080 pcs) with Cut Tape and Digi-Reel packaging options. M93C56-WMN6P provides the largest total inventory (5,000,300 pcs) in Tube packaging. M93C56-RMN6TP is available in Tape & Reel format with 25,200 pcs in stock.

Frequently Asked Questions (FAQ)

Q: Can M93C56 parts directly replace the AT93C56W-10SC-2.7 without firmware changes?

A: Direct replacement requires interface protocol adaptation. The AT93C56W-10SC-2.7 uses 3-Wire Serial protocol, while M93C56 parts use Microwire protocol. Although both are serial EEPROM communication standards, the command sequences and timing differ. Firmware or hardware interface logic must be modified to support Microwire protocol.

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

A: Both are serial communication protocols for EEPROM devices. Microwire is a specific implementation of serial communication with defined command structures. 3-Wire Serial is a generic serial interface. The protocols differ in command format, timing requirements, and data transmission sequences. Consult device datasheets for detailed protocol specifications.

Q: Are the M93C56 parts pin-compatible with the AT93C56W-10SC-2.7?

A: Yes, all parts share the identical 8-SOIC package with 0.154" (3.90mm) width. Pin count and physical layout are identical, allowing direct PCB footprint compatibility. However, pin function assignments may differ between 3-Wire Serial and Microwire protocols, requiring circuit design review.

Q: Which substitute part should I select for new designs?

A: M93C56-WMN6TP is recommended for new designs due to Active product status, ROHS3 compliance, 2 MHz clock frequency matching the original part, and verified programmability. This part is available in Cut Tape and Digi-Reel packaging suitable for both prototype and production quantities.

Q: What is the impact of the lower write cycle time (5ms vs. 10ms) in substitute parts?

A: The substitute parts feature faster write cycle times (5ms) compared to the original part (10ms). This represents improved performance and does not create compatibility issues. Applications designed for 10ms write cycles will function correctly with faster write cycles.

Q: Are there temperature range considerations for substitute part selection?

A: The original part operates from 0°C to 70°C (commercial range). All substitute parts operate from -40°C to 85°C (industrial range). If the application requires only commercial temperature operation, substitute parts provide extended capability without penalty. If the application requires operation below 0°C or above 70°C, substitute parts enable this extended range.

Q: What packaging options are available for production quantities?

A: M93C56-RMN6TP is supplied in Tape & Reel (TR) format. M93C56-WMN6P is supplied in Tube packaging. M93C56-WMN6TP is supplied in Cut Tape (CT) and Digi-Reel® format. Selection depends on assembly equipment compatibility and production volume requirements.

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