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

Part Overview

The 93C46C-I/ST is a 1Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 3 MHz clock frequency. This component is designed for applications requiring low-capacity persistent data storage with serial communication. The part is currently in active production status with verified programmability certification from DiGi-Electronics.

Substitute parts are necessary when the primary part experiences supply constraints, inventory limitations, or when design requirements permit operation within extended electrical parameter ranges. All substitute candidates maintain identical memory capacity, organization, and physical packaging while offering variations in interface protocol, clock frequency, voltage supply range, and write cycle timing.

Substiute Parts

93C46C-I/ST

Microchip TechnologyIn Stock: 162993C46C-I/ST Datasheet

Current PartRFQ

93LC46C-I/ST

Microchip TechnologyIn Stock: 135693LC46C-I/ST Datasheet

MFR RecommendedRFQ

AT93C46D-TH-B

Microchip TechnologyIn Stock: 2367AT93C46D-TH-B Datasheet

MFR RecommendedRFQ

CAT93C46YI-G

onsemiIn Stock: 1974CAT93C46YI-G Datasheet

MFR RecommendedRFQ

M93C46-WDW6TP

STMicroelectronicsIn Stock: 57716M93C46-WDW6TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Fixed Requirements (Non-Negotiable):

• Memory Size: 1Kbit
• Memory Organization: 128 x 8, 64 x 16
• Package / Case: 8-TSSOP (0.173", 4.40mm Width)
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C ~ 85°C (TA)
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Variable Parameters (Substitution Permitted):

• Memory Interface: Microwire or 3-Wire Serial
• Clock Frequency: 2 MHz or 3 MHz
• Write Cycle Time: 2ms, 5ms, or 6ms
• Voltage Supply Range: Minimum 1.8V to 4.5V; Maximum 5.5V (original requires 4.5V minimum)

All four substitute parts meet the fixed requirements. Variations in interface protocol, clock frequency, and write cycle timing are acceptable provided the application circuit design accommodates these differences.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Verified Programmability):

The AT93C46D-TH-B and M93C46-WDW6TP are qualified substitutes with verified DiGi-Electronics programmability certification. Both parts maintain full compatibility with the 8-TSSOP package and operating temperature range. The AT93C46D-TH-B operates with extended voltage supply range (1.8V minimum) and implements 3-Wire Serial interface protocol instead of Microwire. The M93C46-WDW6TP maintains Microwire protocol compatibility with 2 MHz clock frequency and is available in highest inventory quantity (57700 pcs).

Secondary Substitutes (Unverified Programmability):

The 93LC46C-I/ST and CAT93C46YI-G are functionally compatible but lack DiGi-Electronics programmability verification. The 93LC46C-I/ST is a Microchip Technology product with extended voltage supply range (2.5V minimum) and identical 3 MHz clock frequency to the primary part. The CAT93C46YI-G is manufactured by onsemi with extended voltage supply range (1.8V minimum) and operates at 2 MHz clock frequency.

Selection Criteria:

• For applications requiring verified programmability certification: Select AT93C46D-TH-B or M93C46-WDW6TP
• For applications requiring Microwire protocol compatibility: Select 93LC46C-I/ST, CAT93C46YI-G, or M93C46-WDW6TP
• For applications requiring 3-Wire Serial protocol: Select AT93C46D-TH-B
• For applications requiring extended low-voltage operation (below 2.5V): Select AT93C46D-TH-B or CAT93C46YI-G
• For maximum inventory availability: Select M93C46-WDW6TP

Frequently Asked Questions (FAQ)

Q: Can the AT93C46D-TH-B replace the 93C46C-I/ST if the circuit uses Microwire protocol?

A: No. The AT93C46D-TH-B implements 3-Wire Serial interface protocol, which is electrically and functionally distinct from Microwire protocol. Circuit redesign is required to accommodate the different serial communication protocol. Direct pin-for-pin substitution is not possible.

Q: What is the impact of using a substitute part with 2 MHz clock frequency instead of 3 MHz?

A: The 2 MHz clock frequency (93LC46C-I/ST, AT93C46D-TH-B, CAT93C46YI-G, M93C46-WDW6TP) reduces maximum serial communication speed compared to the 3 MHz primary part. Applications with timing-critical data transfer requirements must account for increased access latency. Write cycle times remain within acceptable ranges (2ms to 6ms) for non-real-time applications.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts are supplied in 8-TSSOP (0.173", 4.40mm Width) surface mount package, identical to the primary part. PCB layout and reflow soldering parameters remain unchanged.

Q: What does DiGi-Electronics Programmability Verification indicate?

A: DiGi-Electronics Programmability Verification confirms that the part has been tested and certified for in-circuit programming compatibility with standard EEPROM programming equipment and protocols. Unverified parts may require additional testing or alternative programming procedures.

Q: Can the 93LC46C-I/ST be used in applications requiring 4.5V minimum supply voltage?

A: Yes. The 93LC46C-I/ST supports voltage supply range of 2.5V to 5.5V, which encompasses the 4.5V to 5.5V requirement of the primary part. The extended lower voltage limit provides additional design flexibility without compromising operation at higher voltages.

Q: Which substitute part offers the best inventory availability?

A: The M93C46-WDW6TP manufactured by STMicroelectronics offers the highest inventory quantity at 57700 pcs. This part maintains Microwire protocol compatibility, verified programmability certification, and operates within acceptable electrical parameters for most applications.