Equivalent & Substitute Parts for 93LC56X/SN

Part Overview

The 93LC56X/SN is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol with 2 MHz clock frequency. This non-volatile memory device is designed for applications requiring persistent data storage in a compact 8-SOIC surface mount package. The part is currently active in production with 706 units in stock.

Substitute parts are necessary when the primary part becomes unavailable, when design requirements demand extended temperature ranges, improved write cycle performance, or when alternative manufacturers' components offer superior inventory availability or cost optimization while maintaining functional compatibility.

Key Parameters

Parameter	93LC56X/SN
Memory Size	2Kbit
Memory Organization	256 x 8, 128 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	10ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC56X/SN is determined by the following critical parameters:

Primary Compatibility Criteria:

Memory Size: 2Kbit (fixed requirement)
Memory Organization: 256 x 8, 128 x 16 (fixed requirement)
Package / Case: 8-SOIC form factor (fixed requirement)
Mounting Type: Surface Mount (fixed requirement)

Interface Compatibility:

Memory Interface: Microwire protocol (primary) or 3-Wire Serial (compatible alternative)
Clock Frequency: 2 MHz (primary) or 3 MHz (acceptable upgrade)

Electrical Compatibility:

Voltage Supply Range: Must encompass or exceed 2.5V ~ 5.5V minimum requirement
Operating Temperature: Must support minimum 0°C ~ 70°C range

Compliance Requirements:

RoHS3 Compliant (mandatory)
REACH Unaffected (mandatory)

Substitute parts meeting all primary criteria and electrical requirements are classified as direct functional equivalents. Parts with enhanced specifications (higher clock frequency, extended temperature range, improved write cycle time) are classified as performance upgrades while maintaining backward compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Interface	Clock Freq	Write Cycle	Voltage Range	Temp Range	Package	MSL	Inventory
93LC56X/SN	Microchip	2Kbit	Microwire	2 MHz	10ms	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	1	706
93AA56/SN	Microchip	2Kbit	Microwire	2 MHz	10ms	1.8V ~ 5.5V	0°C ~ 70°C	8-SOIC	3	1915
93AA56C-I/SN	Microchip	2Kbit	Microwire	3 MHz	6ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1	1749
93LC56-I/SN	Microchip	2Kbit	Microwire	2 MHz	10ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1	1367
93LC56/SN	Microchip	2Kbit	Microwire	2 MHz	10ms	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	3	1964
93LC56C-E/SN	Microchip	2Kbit	Microwire	3 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	1	939
93LC56C-I/SN	Microchip	2Kbit	Microwire	3 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1	4877
AT93C56B-SSHM-B	Microchip	2Kbit	3-Wire Serial	2 MHz	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	3	4010
M93C56-RMN3TP/K	STMicroelectronics	2Kbit	Microwire	2 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-SOIC	1	5100
M93C56-WMN6P	STMicroelectronics	2Kbit	Microwire	2 MHz	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1	5000300

Engineering Selection Recommendations

Direct Functional Equivalents (Identical Specifications):

93LC56/SN: Identical electrical and thermal specifications to 93LC56X/SN. Suitable for direct replacement in all applications. Higher inventory availability (1964 units).

Performance-Enhanced Substitutes (Backward Compatible):

93LC56C-I/SN: Offers 3 MHz clock frequency and 6ms write cycle time versus 2 MHz and 10ms. Extended temperature range (-40°C ~ 85°C). Highest inventory (4877 units). Recommended for applications requiring improved write performance.
93LC56C-E/SN: Extends operating temperature to -40°C ~ 125°C with 3 MHz clock and 6ms write cycle. Suitable for high-temperature industrial applications.
93LC56-I/SN: Extends temperature range to -40°C ~ 85°C while maintaining 2 MHz operation and 10ms write cycle. Recommended for extended temperature requirement applications.

Lower Voltage Supply Capability:

93AA56/SN: Reduces minimum supply voltage to 1.8V while maintaining 2 MHz operation. Suitable for low-power applications. MSL rating 3 requires moisture control during storage.
93AA56C-I/SN: Combines 1.8V minimum supply with 3 MHz performance and -40°C ~ 85°C temperature range.

Alternative Interface Protocol:

AT93C56B-SSHM-B: Implements 3-Wire Serial interface instead of Microwire. Requires firmware/hardware interface modification. Offers 5ms write cycle time. Suitable only when 3-Wire Serial protocol is acceptable.

Alternative Manufacturer (STMicroelectronics):

M93C56-WMN6P: Microwire interface, 2 MHz operation, 5ms write cycle, 2.5V ~ 5.5V supply. Exceptional inventory (5,000,300 units). Recommended for high-volume applications requiring supply chain redundancy.
M93C56-RMN3TP/K: Automotive-grade (AEC-Q100) with -40°C ~ 125°C temperature range, 1.8V ~ 5.5V supply, 5ms write cycle. Recommended for automotive and extended temperature applications.

Frequently Asked Questions (FAQ)

Q: Can 93AA56/SN replace 93LC56X/SN in all applications? A: 93AA56/SN is functionally compatible for applications operating at 2.5V or higher supply voltage. The lower minimum voltage specification (1.8V) provides additional design flexibility. However, MSL rating 3 requires controlled moisture storage conditions compared to MSL 1 for 93LC56X/SN.

Q: What is the difference between Microwire and 3-Wire Serial interfaces? A: Both are serial communication protocols for EEPROM access. Microwire uses dedicated clock and data lines. 3-Wire Serial uses a different signaling scheme. AT93C56B-SSHM-B implements 3-Wire Serial and requires different firmware/hardware interface implementation. Direct substitution is not possible without interface modification.

Q: Why do some substitutes have faster write cycle times (5ms vs 10ms)? A: Enhanced versions like 93LC56C-I/SN and M93C56-WMN6P incorporate improved internal circuitry enabling faster write operations. These are backward compatible and provide performance benefits without requiring design changes.

Q: Is the M93C56-RMN3TP/K automotive-grade part suitable for non-automotive applications? A: Yes. Automotive-grade components meet AEC-Q100 qualification standards, which impose stricter reliability and testing requirements than standard industrial grades. These parts are suitable for any application and provide enhanced reliability assurance.

Q: What does MSL rating mean for part selection? A: MSL (Moisture Sensitivity Level) indicates moisture absorption limits during storage. MSL 1 (Unlimited) allows indefinite storage without moisture control. MSL 3 (168 Hours) requires desiccant storage and limits shelf life to 168 hours after opening. For applications with extended storage requirements, MSL 1 parts are preferred.

Q: Can I use 93AA56C-I/SN if my circuit operates at 2.5V minimum? A: Yes. 93AA56C-I/SN specifies 1.8V ~ 5.5V supply range, which encompasses your 2.5V minimum requirement. The lower minimum voltage specification does not restrict operation at higher voltages.

Q: Which substitute offers the best inventory availability? A: M93C56-WMN6P from STMicroelectronics provides exceptional inventory (5,000,300 units), making it optimal for high-volume production or applications requiring supply chain redundancy.

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