93LC46C-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC46C-E/ST is a 1Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, designed for Microwire serial interface applications. This component operates across a wide supply voltage range of 2.5V to 5.5V and supports industrial temperature ranges from -40°C to 125°C. The device is currently in active production status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical specifications, memory capacity, interface protocol, and physical packaging are maintained across alternative manufacturers, ensuring functional interchangeability in circuit designs.

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
Supply Voltage Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Write Cycle Time	6ms
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC46C-E/ST is determined by strict equivalence across the following critical parameters:

Memory Capacity & Organization: The substitute part must maintain 1Kbit total capacity with 128 x 8 or 64 x 16 organization to ensure software and firmware compatibility.

Serial Interface Protocol: Microwire interface compatibility is mandatory. The substitute must support identical command sequences and timing protocols.

Physical Package: Both parts must use 8-TSSOP surface mount packaging with identical pin assignments and mechanical dimensions (0.173", 4.40mm Width) to ensure PCB layout compatibility without redesign.

Supply Voltage Range: The substitute must operate within the 2.5V to 5.5V range to function in existing power supply configurations.

RoHS & Environmental Compliance: ROHS3 compliance and MSL rating of 1 are required to meet manufacturing and regulatory standards.

The M93C46-WDW6TP from STMicroelectronics meets all substitution criteria for the 93LC46C-E/ST, with the following operational differences noted in the parameter comparison table.

Parameter Comparison

Parameter	93LC46C-E/ST (Microchip)	M93C46-WDW6TP (STMicroelectronics)	Compatibility Notes
Memory Size	1Kbit	1Kbit	Equivalent
Memory Organization	128 x 8, 64 x 16	128 x 8, 64 x 16	Equivalent
Memory Interface	Microwire	Microwire	Equivalent
Clock Frequency	3 MHz	2 MHz	Substitute operates at lower frequency; compatible with designs using 3 MHz specification
Write Cycle Time	6ms	5ms	Substitute has faster write cycle; functionally compatible
Supply Voltage Range	2.5V ~ 5.5V	2.5V ~ 5.5V	Equivalent
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	Substitute has narrower temperature range; verify application requirements
Package Type	8-TSSOP	8-TSSOP	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The M93C46-WDW6TP is a direct functional substitute for the 93LC46C-E/ST in applications where the operating temperature range does not exceed 85°C. Both devices maintain ROHS3 compliance and identical MSL ratings, ensuring equivalent environmental and regulatory performance.

For applications requiring the full -40°C to 125°C temperature range of the original 93LC46C-E/ST, the operating temperature specification of the M93C46-WDW6TP must be verified against actual system requirements before substitution.

The lower clock frequency (2 MHz vs. 3 MHz) and faster write cycle time (5ms vs. 6ms) of the substitute part do not present compatibility issues in standard Microwire interface implementations, as these parameters remain within acceptable operational margins for serial EEPROM communication protocols.

Frequently Asked Questions (FAQ)

Q: Can the M93C46-WDW6TP replace the 93LC46C-E/ST in all applications?

A: The M93C46-WDW6TP is functionally compatible for applications operating within -40°C to 85°C. Applications requiring operation above 85°C must use the original 93LC46C-E/ST or identify alternative parts with extended temperature specifications.

Q: Are the pin assignments identical between these two parts?

A: Yes. Both the 93LC46C-E/ST and M93C46-WDW6TP use 8-TSSOP packaging with identical pin configurations. No PCB layout modifications are required for substitution.

Q: Does the lower clock frequency of the substitute part affect circuit performance?

A: No. The 2 MHz clock frequency of the M93C46-WDW6TP is compatible with Microwire interface designs specified for 3 MHz operation. The substitute operates at a lower frequency margin, which does not degrade functionality.

Q: Are both parts RoHS compliant?

A: Yes. Both the 93LC46C-E/ST and M93C46-WDW6TP are ROHS3 compliant with MSL rating of 1 (Unlimited), meeting current manufacturing and environmental standards.

Q: What is the primary difference between these two parts?

A: The primary difference is the maximum operating temperature. The 93LC46C-E/ST operates to 125°C, while the M93C46-WDW6TP operates to 85°C. The substitute also operates at a lower clock frequency (2 MHz vs. 3 MHz) and has a faster write cycle time (5ms vs. 6ms).

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message