93LC86T/SN EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC86T/SN is a 16Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 3 MHz clock frequency. Housed in an 8-SOIC surface mount package, this component operates across a 2.5V to 6.0V supply voltage range and -40°C to 85°C temperature range. The device is RoHS3 compliant and maintains active product status with verified programmability through DiGi-Electronics.

Substitute parts become necessary when the primary part number experiences supply constraints, extended lead times, or when design flexibility permits alternative manufacturers or packaging formats while maintaining functional equivalence.

Key Parameters

Parameter	Specification
Memory Type	Non-Volatile EEPROM
Memory Size	16Kbit
Memory Organization	2K x 8, 1K x 16
Memory Interface	Microwire
Clock Frequency	3 MHz
Write Cycle Time	5ms
Voltage Supply Range	2.5V ~ 6.0V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution validity for the 93LC86T/SN is determined by strict alignment across the following critical parameters:

Memory Specifications: All substitutes must maintain 16Kbit capacity with 2K x 8 or 1K x 16 organization to ensure data structure compatibility.

Interface Protocol: Microwire serial interface is the primary substitution criterion. Parts using alternative protocols (such as 3-Wire Serial) represent functional alternatives only when system firmware supports protocol switching.

Clock Frequency: The 3 MHz specification establishes timing requirements. Substitutes operating at equal or higher frequencies (3 MHz, 4 MHz) maintain compatibility. Lower frequencies may introduce timing constraints.

Voltage Supply Range: The 2.5V to 6.0V range defines operational boundaries. Substitutes must support the full supply voltage of the primary application or at minimum overlap the required operating window.

Package and Pinout: All substitutes use 8-SOIC surface mount packaging with identical 0.154" width, ensuring PCB footprint compatibility without layout modification.

Temperature Range: Operating temperature -40°C to 85°C is standard across all listed substitutes, with one exception noted for automotive-grade variants.

Parameter Comparison

Parameter	93LC86T/SN	93LC86CT-I/SN	93LC86T-I/SN	AT93C86A-10SU-2.7	CAT93C86BVI-GT3	CAV93C86VE-GT3
Manufacturer	Microchip	Microchip	Microchip	Microchip	onsemi	onsemi
Memory Size	16Kbit	16Kbit	16Kbit	16Kbit	16Kbit	16Kbit
Memory Organization	2K x 8, 1K x 16	2K x 8, 1K x 16	2K x 8, 1K x 16	2K x 8, 1K x 16	1K x 16, 2K x 8	2K x 8, 1K x 16
Interface	Microwire	Microwire	Microwire	3-Wire Serial	Microwire	Microwire
Clock Frequency	3 MHz	3 MHz	3 MHz	2 MHz	4 MHz	2 MHz
Write Cycle Time	5ms	5ms	5ms	10ms	—	—
Voltage Supply	2.5V ~ 6.0V	2.5V ~ 5.5V	2.5V ~ 6.0V	2.7V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Packaging Format	Tape & Reel	Cut Tape & Digi-Reel	Cut Tape & Digi-Reel	Tube	Tape & Reel	Tape & Reel
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Programmability Verified	Yes	Yes	Yes	Yes	Not Verified	Not Verified

Engineering Selection Recommendations

Direct Microwire Interface Substitutes (Preferred):

93LC86CT-I/SN and 93LC86T-I/SN maintain identical Microwire protocol, 3 MHz clock frequency, and 5ms write cycle time. Both are Microchip products with verified programmability. The 93LC86T-I/SN extends voltage supply to 6.0V matching the primary part. The 93LC86CT-I/SN operates to 5.5V and carries MSL-3 rating. Both are available in Cut Tape & Digi-Reel packaging.

CAT93C86BVI-GT3 (onsemi) provides Microwire interface with elevated 4 MHz clock frequency and 100 ns access time, supporting wider voltage range (1.8V to 5.5V). Programmability is not verified through DiGi-Electronics. This part offers performance headroom but requires validation in target application.

CAV93C86VE-GT3 (onsemi) operates as automotive-grade component with AEC-Q100 qualification and extended temperature range to 125°C. Microwire interface and 2 MHz clock frequency are specified. Programmability verification status is not confirmed. Selection is appropriate for automotive applications requiring temperature extension.

Alternative Protocol Substitute (Conditional):

AT93C86A-10SU-2.7 implements 3-Wire Serial interface protocol, representing functional alternative only when system design permits firmware-level protocol support. Clock frequency reduces to 2 MHz and write cycle extends to 10ms. MSL-1 rating and verified programmability are confirmed. Voltage range 2.7V to 5.5V requires validation against supply specifications.

Packaging Considerations:

Tape & Reel format (93LC86T/SN, CAT93C86BVI-GT3, CAV93C86VE-GT3) suits high-volume automated assembly. Cut Tape & Digi-Reel format (93LC86CT-I/SN, 93LC86T-I/SN) accommodates lower-volume or mixed-component pick operations. Tube packaging (AT93C86A-10SU-2.7) is suitable for manual assembly or small-quantity applications.

Frequently Asked Questions (FAQ)

Q: Can 93LC86CT-I/SN replace 93LC86T/SN in all applications?

A: 93LC86CT-I/SN is functionally equivalent for Microwire protocol applications. The primary difference is voltage supply range: 93LC86CT-I/SN operates 2.5V to 5.5V versus 93LC86T/SN at 2.5V to 6.0V. Verify that your application supply voltage does not exceed 5.5V. MSL-3 rating requires controlled storage conditions (168 hours at 60% RH maximum).

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

A: Microwire and 3-Wire Serial are distinct serial protocols with different timing and signal requirements. AT93C86A-10SU-2.7 uses 3-Wire Serial protocol. Direct substitution requires firmware support for protocol switching. Consult device datasheets for signal timing and sequence specifications before implementing this substitute.

Q: Why does CAT93C86BVI-GT3 show "Not Verified" for programmability?

A: DiGi-Electronics programmability verification indicates that the part has been tested and confirmed compatible with standard programming equipment and procedures. onsemi parts (CAT93C86BVI-GT3, CAV93C86VE-GT3) have not undergone this specific verification process. Consult onsemi datasheets and programming tool compatibility lists before selection.

Q: Is CAV93C86VE-GT3 suitable for non-automotive applications?

A: CAV93C86VE-GT3 is automotive-grade with AEC-Q100 qualification and extended temperature range (-40°C to 125°C). It functions in standard industrial applications but carries automotive-specific qualification. Selection for non-automotive use is permissible; the extended temperature range provides additional margin.

Q: What does MSL-1 versus MSL-3 rating mean for component handling?

A: MSL (Moisture Sensitivity Level) defines storage and handling requirements. MSL-1 (Unlimited) permits indefinite storage at any humidity without baking. MSL-3 (168 Hours) requires storage below 60% RH or baking at 125°C for 24 hours if moisture absorption occurs. 93LC86T/SN, AT93C86A-10SU-2.7, CAT93C86BVI-GT3, and CAV93C86VE-GT3 carry MSL-1. 93LC86CT-I/SN and 93LC86T-I/SN carry MSL-3.

Q: Can I use CAT93C86BVI-GT3 at 1.8V supply voltage?

A: CAT93C86BVI-GT3 specifies 1.8V minimum supply voltage, extending below the 2.5V minimum of 93LC86T/SN. Operation at 1.8V is within specification for CAT93C86BVI-GT3 but requires validation that your application design supports this lower voltage. Consult the onsemi datasheet for timing and performance characteristics at 1.8V operation.

Q: What packaging format should I select for my assembly process?

A: Tape & Reel format suits automated pick-and-place assembly at production volumes. Cut Tape & Digi-Reel accommodates mixed-component reels or lower-volume runs. Tube packaging is appropriate for manual assembly or prototype builds. Verify your assembly equipment compatibility with selected packaging format.

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