AT93C46-10PI-1.8 Equivalent & Substitute Parts

Part Overview

The AT93C46-10PI-1.8 is a 1Kbit EEPROM memory IC with 3-Wire Serial interface, manufactured by Microchip Technology. This device operates at 2 MHz clock frequency with a supply voltage range of 1.8V to 5.5V and is rated for -40°C to 85°C operating temperature. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new designs requiring compatible functionality.

Substiute Parts

AT93C46-10PI-1.8

Microchip TechnologyIn Stock: 1037AT93C46-10PI-1.8 Datasheet

Current PartRFQ

93AA46/P

Microchip TechnologyIn Stock: 293493AA46/P Datasheet

MFR RecommendedRFQ

93LC46-I/P

Microchip TechnologyIn Stock: 537193LC46-I/P Datasheet

MFR RecommendedRFQ

93LC46/P

Microchip TechnologyIn Stock: 187593LC46/P Datasheet

MFR RecommendedRFQ

93LC46B-I/P

Microchip TechnologyIn Stock: 1831493LC46B-I/P Datasheet

MFR RecommendedRFQ

93LC46B/P

Microchip TechnologyIn Stock: 196393LC46B/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT93C46-10PI-1.8 is determined by the following critical parameters:

Core Compatibility Requirements:

• Memory Size: 1Kbit (fixed across all substitutes)
• Memory Type: Non-Volatile EEPROM (fixed across all substitutes)
• Package / Case: 8-DIP (0.300", 7.62mm) (fixed across all substitutes)
• Mounting Type: Through Hole (fixed across all substitutes)
• Clock Frequency: 2 MHz (fixed across all substitutes)
• Memory Interface: 3-Wire Serial or Microwire (functionally compatible serial protocols)

Variable Parameters Affecting Substitution:

• Supply Voltage Range: Original supports 1.8V ~ 5.5V; substitutes support 2.5V ~ 5.5V or 1.8V ~ 5.5V
• Operating Temperature Range: Original supports -40°C ~ 85°C; substitutes support 0°C ~ 70°C or -40°C ~ 85°C
• Write Cycle Time: Original specifies 10ms; substitutes specify 6ms or 10ms
• Memory Organization: Original supports 128 x 8 and 64 x 16; substitutes support 64 x 16 or both configurations
• Product Status: Original is obsolete; active substitutes are available
• RoHS Compliance: Original is non-compliant; substitutes are ROHS3 compliant

All substitute parts maintain electrical and mechanical compatibility through identical package specifications, memory capacity, and interface protocol support.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 93LC46B-I/P

The 93LC46B-I/P is the recommended primary substitute for the AT93C46-10PI-1.8. This part maintains the extended operating temperature range of -40°C to 85°C, matching the original specification. It is ROHS3 compliant, addressing regulatory requirements for new designs. The 93LC46B-I/P features improved write cycle time of 6ms compared to the original 10ms specification, providing performance enhancement. Inventory availability is substantial at 18,287 pieces. The Microwire interface is functionally compatible with 3-Wire Serial protocol implementations.

Secondary Substitute: 93LC46-I/P

The 93LC46-I/P serves as an alternative when extended temperature range operation is required. This part maintains the -40°C to 85°C operating temperature specification and is ROHS3 compliant. It supports both 128 x 8 and 64 x 16 memory organization options. Inventory availability is 5,300 pieces. The supply voltage range is limited to 2.5V ~ 5.5V, which may restrict use in applications requiring 1.8V operation.

Tertiary Substitute: 93AA46/P

The 93AA46/P is suitable for applications with relaxed temperature requirements (0°C ~ 70°C). This part maintains the original 1.8V ~ 5.5V supply voltage range, supporting low-voltage applications. It is ROHS3 compliant and DiGi-Electronics programmable verified. Inventory availability is 2,900 pieces.

Limited Substitutes: 93LC46/P and 93LC46B/P

The 93LC46/P and 93LC46B/P are suitable only for applications with operating temperature requirements of 0°C ~ 70°C. Both parts are ROHS3 compliant and active products. The 93LC46B/P offers improved 6ms write cycle time. These parts are not suitable for extended temperature range applications.

Frequently Asked Questions (FAQ)

Q: Can the 93LC46B-I/P directly replace the AT93C46-10PI-1.8 in existing designs?

A: The 93LC46B-I/P is mechanically and electrically compatible with the AT93C46-10PI-1.8. Both devices use the 8-DIP package with identical pinout and through-hole mounting. The Microwire interface is functionally compatible with 3-Wire Serial protocol. The extended temperature range (-40°C ~ 85°C) matches the original specification. Verification of interface protocol compatibility with the specific application circuit is required.

Q: What is the difference between 3-Wire Serial and Microwire interfaces?

A: Both 3-Wire Serial and Microwire are serial communication protocols used for EEPROM memory access. The protocols are functionally compatible for the 1Kbit memory devices specified. Interface compatibility depends on the host controller implementation and firmware support.

Q: Why do some substitutes have a 2.5V minimum supply voltage instead of 1.8V?

A: The 93LC46-I/P, 93LC46/P, 93LC46B-I/P, and 93LC46B/P are specified with 2.5V ~ 5.5V supply voltage range. Applications requiring 1.8V operation must use the 93AA46/P or verify that the application circuit operates within the 2.5V ~ 5.5V range.

Q: What is the significance of the write cycle time difference between 10ms and 6ms?

A: The original AT93C46-10PI-1.8 specifies a 10ms write cycle time. The 93LC46B-I/P and 93LC46B/P substitutes specify 6ms write cycle time. The faster write cycle time represents improved performance and does not affect backward compatibility. Applications designed for 10ms write cycles will function correctly with 6ms write cycle devices.

Q: Are all substitute parts ROHS3 compliant?

A: All five substitute parts listed (93AA46/P, 93LC46-I/P, 93LC46/P, 93LC46B-I/P, 93LC46B/P) are ROHS3 compliant. The original AT93C46-10PI-1.8 is RoHS non-compliant. Substitution with any of these parts addresses RoHS compliance requirements for new designs and manufacturing.

Q: Which substitute is best for applications requiring the widest operating temperature range?

A: The 93LC46B-I/P and 93LC46-I/P both support the -40°C ~ 85°C operating temperature range, matching the original specification. The 93LC46B-I/P is preferred due to improved write cycle time (6ms) and higher inventory availability (18,287 pieces).

Q: Can the 93AA46/P be used in applications requiring extended temperature operation?

A: The 93AA46/P is specified for 0°C ~ 70°C operating temperature range. This part is not suitable for applications requiring -40°C ~ 85°C operation. Use 93LC46B-I/P or 93LC46-I/P for extended temperature range requirements.