93C46BX/SN EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46BX/SN is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 2 MHz clock frequency in an 8-SOIC surface mount package. This device is classified as Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are necessary when the primary part becomes unavailable, when extended temperature range operation is required, or when alternative supply chain sources are needed while maintaining functional and electrical compatibility.

Substiute Parts

93C46BX/SN

Microchip TechnologyIn Stock: 97993C46BX/SN Datasheet

Current PartRFQ

93AA46B-I/SN

Microchip TechnologyIn Stock: 184893AA46B-I/SN Datasheet

MFR RecommendedRFQ

93C46B-I/SN

Microchip TechnologyIn Stock: 460493C46B-I/SN Datasheet

MFR RecommendedRFQ

93C46B/SN

Microchip TechnologyIn Stock: 324393C46B/SN Datasheet

MFR RecommendedRFQ

93LC46B-I/SN

Microchip TechnologyIn Stock: 2161493LC46B-I/SN Datasheet

MFR RecommendedRFQ

93LC46B/SN

Microchip TechnologyIn Stock: 151293LC46B/SN Datasheet

MFR RecommendedRFQ

93LC46BX-I/SN

Microchip TechnologyIn Stock: 564393LC46BX-I/SN Datasheet

MFR RecommendedRFQ

AT93C46EN-SH-B

Microchip TechnologyIn Stock: 2190AT93C46EN-SH-B Datasheet

MFR RecommendedRFQ

BR93L46F-WE2

Rohm SemiconductorIn Stock: 9515BR93L46F-WE2 Datasheet

MFR RecommendedRFQ

BR93L46FJ-WE2

Rohm SemiconductorIn Stock: 2428BR93L46FJ-WE2 Datasheet

MFR RecommendedRFQ

BR93L46RFJ-WE2

Rohm SemiconductorIn Stock: 9308BR93L46RFJ-WE2 Datasheet

MFR RecommendedRFQ

M93S46-WMN6P

STMicroelectronicsIn Stock: 6650M93S46-WMN6P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution validity for the 93C46BX/SN is determined by the following critical parameters:

Core Compatibility Requirements:

• Memory capacity: 1Kbit (64 x 16 organization)
• Serial interface protocol: Microwire
• Clock frequency: 2 MHz
• Package type: 8-SOIC surface mount
• RoHS3 compliance and MSL rating

Voltage and Temperature Considerations: Substitute parts are grouped into three categories based on supply voltage range and operating temperature specifications:

1. Standard Range (4.5V ~ 5.5V, 0°C ~ 70°C): Direct functional equivalents with identical electrical operating windows
2. Extended Voltage Range (2.5V ~ 5.5V or 1.8V ~ 5.5V, 0°C ~ 70°C): Compatible for standard temperature applications with broader supply voltage tolerance
3. Extended Temperature Range (-40°C ~ 85°C): Compatible across all voltage variants for industrial and automotive applications requiring wider operating conditions

Write Cycle Time Variance: The 93C46BX/SN specifies 2ms write cycle time. Substitute parts with 5ms or 6ms write cycle times remain functionally compatible as they represent slower operation within the same functional specification.

Package Variants: BR93L46F-WE2 and BR93L46FJ-WE2 (Rohm Semiconductor) use 8-SOP packaging with slightly different physical dimensions (0.173" vs 0.154" width) but maintain electrical and functional compatibility with 8-SOIC pinout standards.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Identical Specifications): 93C46B/SN and 93C46B-I/SN are direct functional equivalents to 93C46BX/SN, maintaining identical voltage supply range (4.5V ~ 5.5V) and write cycle time (2ms). The 93C46B-I/SN variant extends operating temperature to -40°C ~ 85°C, suitable for industrial applications. Both are Microchip Technology products with ROHS3 compliance and MSL rating 1.

Extended Temperature Range Substitutes: 93C46B-I/SN provides identical electrical performance with extended temperature operation (-40°C ~ 85°C). This part is recommended when thermal environment exceeds 70°C or falls below 0°C.

Broader Supply Voltage Compatibility: 93LC46B-I/SN and 93LC46BX-I/SN accept supply voltages from 2.5V ~ 5.5V, providing operational flexibility in systems with variable power supplies. The 93LC46BX-I/SN additionally supports extended temperature range (-40°C ~ 85°C). Write cycle time increases to 6ms, which remains compatible with standard Microwire protocol timing.

Lowest Voltage Operation: 93AA46B-I/SN operates from 1.8V ~ 5.5V with extended temperature range (-40°C ~ 85°C), suitable for low-power and battery-operated applications. Write cycle time is 6ms.

Alternative Interface Protocol: AT93C46EN-SH-B implements 3-Wire Serial interface instead of Microwire. This part is functionally compatible only in systems designed to support 3-Wire Serial protocol. It provides extended voltage (1.8V ~ 5.5V) and temperature (-40°C ~ 85°C) ranges with 5ms write cycle time.

Rohm Semiconductor Alternatives: BR93L46F-WE2, BR93L46FJ-WE2, and BR93L46RFJ-WE2 are Rohm Semiconductor equivalents with Microwire interface, 1Kbit capacity, and 2 MHz operation. These parts feature extended voltage (1.8V ~ 5.5V) and temperature (-40°C ~ 85°C) ranges with 5ms write cycle time. Package variants (8-SOP vs 8-SOP-J) maintain electrical compatibility with standard 8-SOIC pinout.

All substitute parts maintain ROHS3 compliance, MSL rating 1, and Active product status.

Frequently Asked Questions (FAQ)

Q: Can 93LC46B-I/SN replace 93C46BX/SN in a 5V system? A: Yes. The 93LC46B-I/SN operates within the 4.5V ~ 5.5V range required by the original part and maintains Microwire interface, 1Kbit capacity, and 2 MHz clock frequency. The extended temperature range (-40°C ~ 85°C) provides additional operational margin. Write cycle time increases from 2ms to 6ms, which is compatible with standard Microwire protocol timing.

Q: What is the difference between Microwire and 3-Wire Serial interfaces? A: Both are serial communication protocols for EEPROM devices. Microwire is a three-wire protocol (Chip Select, Clock, Data In/Out). 3-Wire Serial is a related but distinct protocol. AT93C46EN-SH-B uses 3-Wire Serial and is compatible only in systems designed to support this specific protocol. Direct substitution requires protocol compatibility verification.

Q: Are Rohm BR93L46 parts pin-compatible with Microchip 93C46 devices? A: BR93L46F-WE2 and BR93L46FJ-WE2 maintain electrical and functional compatibility with Microchip parts through standard 8-SOIC pinout. Physical package dimensions vary slightly (8-SOP vs 8-SOIC), but pin assignments remain compatible. PCB layout verification is recommended for space-constrained applications.

Q: Which substitute part has the widest operating voltage range? A: 93AA46B-I/SN and AT93C46EN-SH-B both operate from 1.8V ~ 5.5V, providing the broadest supply voltage compatibility. 93AA46B-I/SN maintains Microwire interface, while AT93C46EN-SH-B uses 3-Wire Serial protocol.

Q: Is write cycle time critical for substitution? A: Write cycle time differences (2ms vs 5ms vs 6ms) do not prevent functional substitution. Longer write cycle times represent slower operation within the same functional specification. System timing must accommodate the slower write cycle if the substitute part is selected. Microchip 93C46B variants maintain 2ms write cycle time, while 93LC46 and Rohm BR93L46 variants specify 5ms or 6ms.

Q: Can I use 93LC46B/SN (0°C ~ 70°C) instead of 93C46BX/SN? A: Yes, for applications within the 0°C ~ 70°C temperature range. Both parts maintain identical temperature specifications. The 93LC46B/SN provides extended supply voltage range (2.5V ~ 5.5V) compared to the original part (4.5V ~ 5.5V), offering additional operational flexibility.

Q: What does MSL rating 1 mean for these parts? A: MSL (Moisture Sensitivity Level) rating 1 indicates unlimited shelf life without moisture control requirements. All listed substitute parts carry MSL rating 1, ensuring consistent handling and storage procedures.