93C46C-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46C-E/ST is a 1Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for non-volatile data storage applications requiring Microwire serial interface communication. This device operates at 3 MHz clock frequency with a 4.5V to 5.5V supply voltage range and is housed in an 8-TSSOP surface mount package. The part is currently in active production status with verified programmability through DiGi-Electronics. Substitute parts are identified when equivalent memory capacity, interface protocol, package form factor, and operating specifications align within acceptable electrical and mechanical tolerances.

Substiute Parts

93C46C-E/ST

Microchip TechnologyIn Stock: 83593C46C-E/ST Datasheet

Current PartRFQ

M93C46-WDW6TP

STMicroelectronicsIn Stock: 57716M93C46-WDW6TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 93C46C-E/ST is determined by the following critical parameters:

• Memory capacity must be 1Kbit with identical 128 x 8 or 64 x 16 organization
• Serial interface protocol must be Microwire compatible
• Package must be 8-TSSOP with matching 0.173" width and 4.40mm dimensions
• Supply voltage range must accommodate the primary device operating window
• Operating temperature range must support the intended application environment
• Surface mount technology and RoHS3 compliance must be maintained

The M93C46-WDW6TP from STMicroelectronics meets these substitution criteria as a functionally equivalent alternative.

Parameter Comparison

Engineering Selection Recommendations

Both the 93C46C-E/ST and M93C46-WDW6TP are active production devices with ROHS3 compliance and verified programmability. Selection between these parts depends on application-specific requirements:

The 93C46C-E/ST operates at 3 MHz clock frequency with a maximum operating temperature of 125°C and requires a 4.5V minimum supply voltage. The M93C46-WDW6TP operates at 2 MHz with a maximum operating temperature of 85°C but accepts supply voltages as low as 2.5V. The M93C46-WDW6TP exhibits a longer write cycle time of 5ms compared to 2ms for the 93C46C-E/ST.

Applications requiring maximum clock speed or extended temperature operation above 85°C should specify the 93C46C-E/ST. Applications requiring lower supply voltage operation or reduced power consumption may utilize the M93C46-WDW6TP where clock frequency and write cycle time constraints permit.

Frequently Asked Questions (FAQ)

Q: Can the M93C46-WDW6TP directly replace the 93C46C-E/ST in existing designs?

A: Direct replacement is possible when the application does not require operation above 85°C, does not depend on 3 MHz clock frequency, and can accommodate the 5ms write cycle time. The identical 8-TSSOP package and Microwire interface ensure physical and electrical compatibility within these parameter constraints.

Q: What is the impact of the 2 MHz versus 3 MHz clock frequency difference?

A: The M93C46-WDW6TP operates at 2 MHz maximum clock frequency compared to 3 MHz for the 93C46C-E/ST. This results in proportionally slower serial data transfer rates. Applications with strict timing requirements or high-speed data logging may require the higher frequency device.

Q: Are there supply voltage compatibility considerations?

A: The M93C46-WDW6TP accepts supply voltages from 2.5V to 5.5V, while the 93C46C-E/ST requires 4.5V to 5.5V. The M93C46-WDW6TP provides broader voltage compatibility for low-power or battery-operated applications. Both devices operate within the 4.5V to 5.5V window, ensuring compatibility in standard 5V logic systems.

Q: How does the write cycle time difference affect application performance?

A: The 93C46C-E/ST completes write operations in 2ms, while the M93C46-WDW6TP requires 5ms. Applications performing frequent sequential writes or time-critical data logging should account for this difference in system timing calculations.

Q: What are the temperature range implications for substitution?

A: The 93C46C-E/ST operates from -40°C to 125°C, while the M93C46-WDW6TP operates from -40°C to 85°C. Applications requiring operation above 85°C must use the 93C46C-E/ST. Both devices support the full -40°C to 85°C industrial temperature range.

Q: Are packaging and mounting considerations identical?

A: Both devices use 8-TSSOP surface mount packages with identical 0.173" width and 4.40mm dimensions. PCB footprints, reflow profiles, and assembly processes are interchangeable between the two parts.