93C46CT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46CT-E/ST is a 1Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol. This component is designed for applications requiring persistent data storage with low power consumption and high reliability. The device is currently in active production status with verified programmability through DiGi-Electronics.

Substitute parts are identified when design requirements permit relaxation of specific electrical parameters while maintaining core functional compatibility, including identical memory capacity, interface protocol, package form factor, and compliance certifications.

Substiute Parts

93C46CT-E/ST

Microchip TechnologyIn Stock: 103093C46CT-E/ST Datasheet

Current PartRFQ

M93C46-WDW6TP

STMicroelectronicsIn Stock: 57716M93C46-WDW6TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The M93C46-WDW6TP from STMicroelectronics qualifies as a direct substitute based on the following substitution criteria:

Matching Parameters (Required for Substitution):

• Memory capacity: 1Kbit
• Memory organization: 128 x 8, 64 x 16
• Serial interface protocol: Microwire
• Package type: 8-TSSOP with identical physical dimensions
• Surface mount technology
• Non-volatile EEPROM technology
• RoHS3 compliance
• MSL rating: 1 (Unlimited)

Allowable Parameter Variations:

• Clock frequency: 3 MHz (main part) vs. 2 MHz (substitute) — lower frequency is backward compatible
• Write cycle time: 2ms (main part) vs. 5ms (substitute) — extended write time acceptable for non-time-critical applications
• Supply voltage range: 4.5V–5.5V (main part) vs. 2.5V–5.5V (substitute) — substitute supports wider voltage range
• Operating temperature: -40°C to 125°C (main part) vs. -40°C to 85°C (substitute) — substitute covers standard industrial range

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (93C46CT-E/ST): Use when application requirements include maximum clock frequency of 3 MHz, minimum write cycle time of 2ms, or extended operating temperature range to 125°C. This part is recommended for designs with strict timing constraints or high-temperature environments.

Substitute Selection (M93C46-WDW6TP): Use when application timing requirements permit 2 MHz clock frequency and 5ms write cycle time. This substitute is suitable for standard industrial temperature range applications (-40°C to 85°C) and offers extended supply voltage range compatibility (2.5V–5.5V). Both parts maintain identical RoHS3 compliance and MSL ratings, ensuring equivalent environmental and regulatory compliance.

Selection between these parts depends solely on whether the application's timing and temperature specifications align with the substitute's reduced performance envelope.

Frequently Asked Questions (FAQ)

Q: Can M93C46-WDW6TP replace 93C46CT-E/ST in all applications?

A: Substitution is valid only when the application does not require clock frequencies exceeding 2 MHz, write cycle times faster than 5ms, or operating temperatures above 85°C. Verify these three parameters against your design specifications before substitution.

Q: Are the packages physically identical?

A: Both parts use 8-TSSOP packaging with identical physical dimensions (0.173" width, 4.40mm). They are pin-compatible and suitable for the same PCB footprint.

Q: What is the difference in supply voltage range?

A: The 93C46CT-E/ST operates from 4.5V to 5.5V, while the M93C46-WDW6TP operates from 2.5V to 5.5V. The substitute supports a wider lower voltage range, making it compatible with 3.3V systems in addition to 5V systems.

Q: Do both parts have identical Microwire interface timing?

A: Both parts implement the Microwire serial protocol. The primary difference is maximum clock frequency: 3 MHz for the main part versus 2 MHz for the substitute. Applications using lower clock frequencies will function identically.

Q: Are compliance certifications equivalent?

A: Both parts are ROHS3 compliant, REACH unaffected, and carry MSL rating 1 (Unlimited). Regulatory and environmental compliance is equivalent between the two parts.

Q: What is the impact of the 5ms write cycle time on the substitute?

A: The extended write cycle time (5ms versus 2ms) affects only the duration required to complete EEPROM write operations. Applications not requiring rapid sequential writes will experience no functional impact.