Equivalent & Substitute Parts for 93LC46CX-E/SN

Part Overview

The 93LC46CX-E/SN is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 8-SOIC surface mount packaging. This non-volatile memory device operates across a supply voltage range of 2.5V to 5.5V and supports industrial temperature ranges from -40°C to 125°C. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters to ensure functional interchangeability in circuit applications.

Key Parameters

Parameter	Specification
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	128 x 8, 64 x 16
Memory Interface	Microwire
Clock Frequency	3 MHz
Write Cycle Time	6ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 93LC46CX-E/SN are qualified based on the following critical parameters:

Core Compatibility Criteria:

Memory capacity: 1Kbit (128 x 8 or 64 x 16 organization)
Serial interface protocol: Microwire
Package format: 8-SOIC surface mount
Supply voltage overlap: Minimum 2.5V operation
RoHS3 compliance status

Substitution Logic: The STMicroelectronics M93C46 series parts meet these core criteria. All substitute candidates maintain identical memory capacity, Microwire interface, and 8-SOIC packaging. Variations in clock frequency (2 MHz vs. 3 MHz), write cycle time (5ms vs. 6ms), and maximum operating temperature (-40°C to 85°C vs. -40°C to 125°C) represent performance differences that must be evaluated against specific application requirements. Supply voltage ranges for substitutes either match or exceed the main part specification, ensuring compatibility in standard 2.5V to 5.5V operating environments.

Parameter Comparison

Parameter	93LC46CX-E/SN (Microchip)	M93C46-RMN3TP/K (STMicro)	M93C46-WMN6P (STMicro)	M93C46-WMN6TP (STMicro)
Manufacturer	Microchip Technology	STMicroelectronics	STMicroelectronics	STMicroelectronics
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	128 x 8, 64 x 16	128 x 8, 64 x 16	128 x 8, 64 x 16	128 x 8, 64 x 16
Memory Interface	Microwire	Microwire	Microwire	Microwire
Clock Frequency	3 MHz	2 MHz	2 MHz	2 MHz
Write Cycle Time	6ms	5ms	5ms	5ms
Voltage Supply Range	2.5V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

M93C46-RMN3TP/K (STMicroelectronics): This part qualifies as a direct substitute with automotive-grade qualification (AEC-Q100) and extended temperature range matching the main part (-40°C to 125°C). The lower clock frequency (2 MHz vs. 3 MHz) and faster write cycle time (5ms vs. 6ms) present no functional limitation for standard Microwire applications. The expanded supply voltage range (1.8V to 5.5V) provides additional design flexibility. Cut Tape and Digi-Reel packaging format supports automated assembly processes.

M93C46-WMN6P (STMicroelectronics): This substitute maintains full voltage compatibility (2.5V to 5.5V) and identical 8-SOIC packaging. The reduced operating temperature range (-40°C to 85°C) restricts use to applications not requiring the full 125°C upper limit. Tube packaging format is suitable for manual assembly and lower-volume production environments.

M93C46-WMN6TP (STMicroelectronics): This part offers the highest inventory availability and verified programmability status. Operating temperature range (-40°C to 85°C) and voltage specifications (2.5V to 5.5V) match M93C46-WMN6P. Cut Tape and Digi-Reel packaging supports high-volume automated assembly. Selection is appropriate for applications operating within the -40°C to 85°C temperature envelope.

Frequently Asked Questions (FAQ)

Q: Can M93C46-WMN6TP replace 93LC46CX-E/SN in all applications?

A: M93C46-WMN6TP is functionally compatible for applications operating within -40°C to 85°C. Applications requiring operation above 85°C must use M93C46-RMN3TP/K, which maintains the extended temperature range to 125°C.

Q: What is the significance of the 2 MHz vs. 3 MHz clock frequency difference?

A: The main part operates at 3 MHz maximum clock frequency, while all STMicroelectronics substitutes operate at 2 MHz. This represents a 33% reduction in maximum serial communication speed. Applications with timing-critical Microwire protocols must verify that 2 MHz operation meets system requirements.

Q: Are all substitute parts pin-compatible with the original 93LC46CX-E/SN?

A: Yes. All substitute parts use identical 8-SOIC packaging with matching pinout. Direct PCB footprint compatibility is confirmed.

Q: What packaging options are available for each substitute?

A: M93C46-RMN3TP/K is supplied in Cut Tape and Digi-Reel format. M93C46-WMN6P is supplied in Tube packaging. M93C46-WMN6TP is supplied in Cut Tape and Digi-Reel format. Selection depends on assembly process requirements and order volume.

Q: Does the 5ms write cycle time of substitutes affect system performance?

A: The main part specifies 6ms write cycle time; substitutes specify 5ms. This represents a 17% improvement in write performance and presents no compatibility concern for applications designed around the original 6ms specification.

Q: Are all parts RoHS3 compliant?

A: Yes. The main part and all three substitute parts carry ROHS3 compliance certification.

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