93C86CT-I/SN Equivalent & Substitute Parts

Part Overview

The 93C86CT-I/SN is a 16Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 8-SOIC surface mount packaging. This non-volatile memory device operates at 3 MHz clock frequency with a 2ms write cycle time and supports supply voltages from 4.5V to 5.5V across the industrial temperature range of -40°C to 85°C. The part is ROHS3 compliant and currently in active production status. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol compatibility, package form factor, and electrical operating parameters that permit direct functional replacement in circuit applications.

Key Parameters

Parameter	93C86CT-I/SN
Memory Size	16Kbit
Memory Organization	2K x 8, 1K x 16
Memory Interface	Microwire
Clock Frequency	3 MHz
Write Cycle Time	2ms
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93C86CT-I/SN is determined by the following critical parameters: memory capacity (16Kbit), memory organization (2K x 8 or 1K x 16), interface protocol (Microwire or compatible 3-Wire Serial), package type (8-SOIC), and supply voltage compatibility. Parts are grouped into three categories based on interface protocol and voltage operating range:

Category 1: Microwire Interface, Standard Voltage (4.5V ~ 5.5V) Parts maintaining identical Microwire protocol and matching the original 4.5V to 5.5V supply range with equivalent or faster clock frequency and write cycle performance.

Category 2: Microwire Interface, Extended Voltage (2.5V ~ 5.5V or wider) Parts with Microwire protocol supporting lower minimum supply voltages, enabling operation in broader power supply environments while maintaining functional compatibility.

Category 3: 3-Wire Serial Interface, Extended Voltage Parts utilizing 3-Wire Serial protocol (functionally compatible with Microwire in many applications) with extended voltage ranges and automotive-grade qualifications where applicable.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Interface	Clock Frequency	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Product Status
93C86CT-I/SN	Microchip	16Kbit	Microwire	3 MHz	2ms	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
93C86C-I/SN	Microchip	16Kbit	Microwire	3 MHz	2ms	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
93AA86CT-I/SN	Microchip	16Kbit	Microwire	3 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
93LC86CT-I/SN	Microchip	16Kbit	Microwire	3 MHz	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
93LC86T-I/SN	Microchip	16Kbit	Microwire	3 MHz	5ms	2.5V ~ 6.0V	-40°C ~ 85°C	8-SOIC	Active
AT93C86A-10SU-1.8	Microchip	16Kbit	3-Wire Serial	2 MHz	10ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
AT93C86A-10SU-2.7	Microchip	16Kbit	3-Wire Serial	2 MHz	10ms	2.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
CAT93C86VI-GT3	onsemi	16Kbit	Microwire	3 MHz	—	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
CAV93C86VE-GT3	onsemi	16Kbit	Microwire	2 MHz	—	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active
M93C86-RMN3TP/K	STMicroelectronics	16Kbit	Microwire	2 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active
M93C86-WMN6TP	STMicroelectronics	16Kbit	Microwire	2 MHz	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical and Mechanical Specifications)

93C86C-I/SN is a direct substitute with matching Microwire interface, 3 MHz clock frequency, 2ms write cycle time, and 4.5V to 5.5V supply range. The only difference is packaging format (Tube versus Tape & Reel), which does not affect functional performance. Both parts are ROHS3 compliant and in active production.

Compatible Substitutes with Extended Voltage Range

93LC86CT-I/SN and 93LC86T-I/SN support lower minimum supply voltages (2.5V and 2.5V respectively) while maintaining Microwire protocol and 3 MHz clock frequency. These parts are suitable for applications requiring operation at reduced supply voltages. Write cycle time increases to 5ms, which may impact performance-critical applications. Both are ROHS3 compliant and verified as programmable by DiGi-Electronics.

93AA86CT-I/SN extends the minimum supply voltage to 1.8V while maintaining Microwire protocol and 3 MHz clock frequency. Write cycle time is 5ms. This part is suitable for ultra-low-voltage applications.

Automotive-Grade Substitutes

M93C86-RMN3TP/K (STMicroelectronics) and CAV93C86VE-GT3 (onsemi) are automotive-qualified parts meeting AEC-Q100 standards with extended operating temperature range to 125°C. M93C86-RMN3TP/K supports 1.8V to 5.5V supply range with 2 MHz clock frequency and 5ms write cycle time. CAV93C86VE-GT3 operates at 2.5V to 5.5V with 2 MHz clock frequency. These parts are suitable for automotive and industrial applications requiring higher temperature reliability.

Alternative Interface Protocol

AT93C86A-10SU-1.8 and AT93C86A-10SU-2.7 utilize 3-Wire Serial interface instead of Microwire. While functionally compatible in many applications, circuit-level interface modifications may be required. Clock frequency is 2 MHz with 10ms write cycle time. These parts support extended voltage ranges (1.8V to 5.5V and 2.7V to 5.5V respectively) and are verified as programmable.

Cross-Manufacturer Alternatives

CAT93C86VI-GT3 (onsemi) provides Microwire interface with 3 MHz clock frequency and 1.8V to 5.5V supply range. CAV93C86VE-GT3 (onsemi) offers automotive qualification with 2 MHz clock frequency and extended temperature range to 125°C.

Frequently Asked Questions (FAQ)

Q: Can 93LC86CT-I/SN replace 93C86CT-I/SN in all applications?

A: 93LC86CT-I/SN is functionally compatible with identical Microwire interface, 3 MHz clock frequency, and 8-SOIC package. The primary difference is extended minimum supply voltage support (2.5V versus 4.5V) and increased write cycle time (5ms versus 2ms). Applications with strict timing requirements or fixed 4.5V to 5.5V supply specifications should verify write cycle time compatibility before substitution.

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

A: Both protocols are serial communication standards for EEPROM devices. Microwire is a three-wire protocol (Chip Select, Clock, Data In/Out). 3-Wire Serial is a similar protocol with comparable functionality. While electrically compatible in many circuit implementations, interface timing and signal sequencing may differ. Circuit-level verification is necessary when substituting between these protocols.

Q: Are automotive-grade parts (M93C86-RMN3TP/K, CAV93C86VE-GT3) suitable for industrial applications?

A: Yes. Automotive-grade parts meeting AEC-Q100 qualification standards exceed industrial reliability requirements. Extended operating temperature range (-40°C to 125°C) and enhanced quality assurance provide additional margin for demanding industrial environments. These parts are suitable for any application requiring the 93C86CT-I/SN functionality.

Q: What is the impact of write cycle time differences on system performance?

A: The 93C86CT-I/SN specifies 2ms write cycle time. Substitute parts with 5ms write cycle time (93LC86CT-I/SN, 93AA86CT-I/SN, M93C86-RMN3TP/K, M93C86-WMN6TP) require 2.5 times longer for page write operations. Applications performing frequent EEPROM writes must account for this timing difference in firmware or system timing budgets. Single-byte write operations may not be significantly affected.

Q: Can parts with different supply voltage ranges be used interchangeably?

A: Parts are interchangeable only if the application supply voltage falls within the operating range of both the original and substitute part. For example, 93LC86CT-I/SN (2.5V to 5.5V) can replace 93C86CT-I/SN (4.5V to 5.5V) in applications with supply voltages between 4.5V and 5.5V. However, 93C86CT-I/SN cannot replace 93LC86CT-I/SN in applications operating below 4.5V.

Q: Is packaging format (Tape & Reel versus Tube) functionally significant?

A: Packaging format affects component handling, storage, and automated assembly processes but does not impact electrical or mechanical performance. 93C86C-I/SN (Tube packaging) is functionally identical to 93C86CT-I/SN (Tape & Reel packaging). Selection between packaging formats depends on manufacturing process requirements and inventory management practices.

Q: What compliance certifications apply to these substitute parts?

A: All listed parts are ROHS3 compliant and REACH unaffected. Automotive-grade parts (M93C86-RMN3TP/K, CAV93C86VE-GT3) meet AEC-Q100 qualification standards. All parts carry ECCN EAR99 classification and HTSUS code 8542.32.0051. Compliance status is consistent across all substitute options.

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