Equivalent & Substitute Parts for 93LC46T/SN

Part Overview

The 93LC46T/SN is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol. This non-volatile memory device operates at 2 MHz clock frequency with a 10ms write cycle time and supports supply voltages from 2.5V to 5.5V. The component is housed in an 8-SOIC surface mount package and maintains active product status with ROHS3 compliance.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when enhanced performance specifications (higher clock frequency, extended temperature range, or faster write cycles) are needed for specific application requirements.

Key Parameters

Parameter	Specification
Memory Size	1Kbit
Memory Organization	128 x 8, 64 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 Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC46T/SN is determined by the following critical parameters: memory size (1Kbit), memory organization (128 x 8 or 64 x 16), package type (8-SOIC), and mounting method (surface mount). All substitute parts must maintain these core specifications to ensure functional compatibility.

Secondary parameters that may vary between the main part and substitutes include clock frequency (2 MHz or 3 MHz), write cycle time (5ms to 10ms), supply voltage range (1.8V ~ 5.5V or 2.5V ~ 5.5V), and operating temperature range (-40°C ~ 125°C, -40°C ~ 85°C, or 0°C ~ 70°C). Parts with enhanced specifications (higher clock frequency, faster write cycles, wider voltage range, or extended temperature range) are direct substitutes when the application does not require the original specifications as maximum limits.

Memory interface protocol represents a critical distinction: Microwire-based parts (93LC46 and M93C46 series) are substitutable with each other, while 3-Wire Serial interface parts (AT93C46DN-SH-T) require protocol-level compatibility verification before substitution.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Interface	Clock Frequency	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Inventory
93LC46T/SN	Microchip Technology	1Kbit	Microwire	2 MHz	10ms	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	2150 Pcs
93LC46/SN	Microchip Technology	1Kbit	Microwire	2 MHz	10ms	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	3480 Pcs
93AA46CT-I/SN	Microchip Technology	1Kbit	Microwire	3 MHz	6ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	2300 Pcs
93LC46CT-E/SN	Microchip Technology	1Kbit	Microwire	3 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	3909 Pcs
93LC46CT-I/SN	Microchip Technology	1Kbit	Microwire	3 MHz	6ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	3768 Pcs
AT93C46DN-SH-T	Microchip Technology	1Kbit	3-Wire Serial	2 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	88400 Pcs
M93C46-RMN3TP/K	STMicroelectronics	1Kbit	Microwire	2 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-SOIC	9459 Pcs
M93C46-WMN6P	STMicroelectronics	1Kbit	Microwire	2 MHz	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	3485 Pcs
M93C46-WMN6TP	STMicroelectronics	1Kbit	Microwire	2 MHz	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	61180 Pcs

Engineering Selection Recommendations

Direct Microchip Technology Substitutes (Microwire Interface)

The 93LC46/SN serves as the primary direct substitute, offering identical electrical specifications and interface protocol with higher inventory availability (3480 Pcs). Both 93LC46CT-I/SN and 93LC46CT-E/SN provide enhanced performance with 3 MHz clock frequency and 6ms write cycle time while maintaining Microwire compatibility. The 93LC46CT-E/SN extends operating temperature to -40°C ~ 125°C, suitable for industrial applications. All Microchip parts maintain ROHS3 compliance and verified programmability status.

STMicroelectronics Alternatives (Microwire Interface)

The M93C46-WMN6TP offers the highest inventory level (61180 Pcs) with verified programmability, matching the original 2 MHz clock frequency and 2.5V ~ 5.5V supply range while reducing write cycle time to 5ms. The M93C46-RMN3TP/K provides automotive-grade qualification (AEC-Q100) with extended temperature range (-40°C ~ 125°C) and wider supply voltage support (1.8V ~ 5.5V), suitable for automotive and industrial applications. The M93C46-WMN6P provides equivalent specifications in tube packaging format.

Interface Protocol Consideration

The AT93C46DN-SH-T implements 3-Wire Serial interface protocol rather than Microwire, requiring circuit-level protocol compatibility verification before substitution. This part is not recommended as a direct replacement without confirming application-level interface support.

Frequently Asked Questions (FAQ)

Q: Can I substitute 93LC46T/SN with 93LC46/SN?

A: Yes. Both parts are manufactured by Microchip Technology with identical electrical specifications, memory organization, Microwire interface, clock frequency (2 MHz), write cycle time (10ms), and supply voltage range (2.5V ~ 5.5V). The primary difference is packaging format (tube vs. standard). Functional compatibility is complete.

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

A: Microwire and 3-Wire Serial are distinct serial communication protocols. Parts using Microwire interface (93LC46 series, M93C46 series) are substitutable with each other. The AT93C46DN-SH-T uses 3-Wire Serial protocol and requires protocol-level compatibility verification in the application circuit before substitution.

Q: Can I use 93AA46CT-I/SN as a substitute for 93LC46T/SN?

A: Yes, with performance enhancement. The 93AA46CT-I/SN maintains identical memory size, organization, and Microwire interface. It provides higher clock frequency (3 MHz vs. 2 MHz), faster write cycle time (6ms vs. 10ms), wider supply voltage range (1.8V ~ 5.5V vs. 2.5V ~ 5.5V), and extended operating temperature (-40°C ~ 85°C vs. 0°C ~ 70°C). All enhancements are backward compatible.

Q: What are the advantages of STMicroelectronics M93C46 parts over Microchip equivalents?

A: STMicroelectronics M93C46 parts offer faster write cycle time (5ms vs. 10ms for the original part), wider supply voltage range (1.8V ~ 5.5V for M93C46-RMN3TP/K), and extended operating temperature range (-40°C ~ 125°C for M93C46-RMN3TP/K). The M93C46-RMN3TP/K includes automotive-grade qualification (AEC-Q100). All maintain Microwire interface compatibility and 8-SOIC packaging.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, matching the original 93LC46T/SN specification.

Q: What packaging formats are available?

A: Substitute parts are available in multiple packaging formats: Tube (93LC46/SN, M93C46-WMN6P), Cut Tape & Digi-Reel (93AA46CT-I/SN, 93LC46CT-I/SN, AT93C46DN-SH-T, M93C46-RMN3TP/K, M93C46-WMN6TP), and Tape & Reel (93LC46CT-E/SN). Select packaging format based on manufacturing process requirements.

Q: Which substitute offers the best inventory availability?

A: The AT93C46DN-SH-T provides the highest inventory level at 88400 Pcs. However, this part uses 3-Wire Serial interface rather than Microwire, requiring protocol compatibility verification. For Microwire-compatible parts, M93C46-WMN6TP offers the highest inventory at 61180 Pcs.

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