LMC6084AIM Equivalent & Substitute Parts

Part Overview

The LMC6084AIM is a CMOS quad operational amplifier manufactured by Texas Instruments, configured as a 4-circuit push-pull, rail-to-rail amplifier in a 14-SOIC surface mount package. This device is classified as obsolete, indicating discontinued production and limited availability for new designs. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	LMC6084AIM	—
Manufacturer	Texas Instruments	—
Amplifier Type	CMOS	—
Number of Circuits	4	—
Output Type	Push-Pull, Rail-to-Rail	—
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Slew Rate	1.5	V/µs
Gain Bandwidth Product	1.3	MHz
Current - Input Bias	0.01	pA
Voltage - Input Offset	150	µV
Current - Supply (x4 Channels)	2.2	mA
Current - Output / Channel	34	mA
Voltage - Supply Span (Min)	4.5	V
Voltage - Supply Span (Max)	15.5	V
Operating Temperature	-40 to 85	°C
Product Status	Obsolete	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the LMC6084AIM is determined by the following critical parameters that must align with the original device specifications:

Mandatory Compatibility Parameters:

Package / Case: 14-SOIC (0.154", 3.90mm Width) — ensures mechanical and electrical pin compatibility
Number of Circuits: 4 — maintains functional equivalence as a quad amplifier
Output Type: Rail-to-Rail — preserves output swing characteristics
Mounting Type: Surface Mount — supports existing PCB assembly processes
Voltage - Supply Span: minimum 4.5 V and maximum 15.5 V — ensures operation within the original supply range
Operating Temperature: -40°C to 85°C minimum — maintains thermal operating envelope

Performance Parameters for Functional Equivalence:

Slew Rate: 1.5 V/µs or greater — determines signal fidelity and transient response
Gain Bandwidth Product: 1.3 MHz or greater — establishes frequency response capability
Current - Input Bias: 0.01 pA or lower — maintains input impedance characteristics
Voltage - Input Offset: 150 µV or lower — preserves DC accuracy
Current - Supply: 2.2 mA (x4 Channels) or lower — ensures power consumption compatibility
Current - Output / Channel: 34 mA or greater — maintains output drive capability

Substitute parts meeting or exceeding these parameters within the specified ranges are electrically and mechanically compatible with the LMC6084AIM.

Parameter Comparison

Parameter	LMC6084AIM	LMC6084AIM/NOPB	OPA4171AQDRQ1	AD8664ARZ	AD8664ARZ-REEL7	AD8669ARZ	AD8669ARZ-REEL	AD8669ARZ-REEL7
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Amplifier Type	CMOS	CMOS	General Purpose	CMOS	CMOS	General Purpose	General Purpose	General Purpose
Number of Circuits	4	4	4	4	4	4	4	4
Output Type	Push-Pull, Rail-to-Rail	Push-Pull, Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Slew Rate (V/µs)	1.5	1.5	1.5	3.5	3.5	0.3	0.3	0.3
Gain Bandwidth Product (MHz)	1.3	1.3	3	4	4	0.54	0.54	0.54
Current - Input Bias (pA)	0.01	0.01	8	0.3	0.3	0.3	0.3	0.3
Voltage - Input Offset (µV)	150	150	250	50	50	40	40	40
Current - Supply (mA, x4 Channels)	2.2	2.2	0.475	1.25	1.25	0.23	0.23	0.23
Current - Output / Channel (mA)	34	34	35	140	140	50	50	50
Voltage - Supply Span Min (V)	4.5	4.5	4.5	5	5	5	5	5
Voltage - Supply Span Max (V)	15.5	15.5	36	16	16	16	16	16
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Highest Compatibility):

The LMC6084AIM/NOPB is the direct equivalent of the LMC6084AIM, manufactured by National Semiconductor. This part maintains identical electrical specifications and package configuration. The primary distinction is product status: LMC6084AIM/NOPB is active and currently available, whereas the LMC6084AIM is obsolete. This substitute provides seamless design continuity with no circuit modifications required.

CMOS Amplifier Substitutes with Enhanced Performance:

The AD8664ARZ and AD8664ARZ-REEL7 (Analog Devices Inc., DigiTrim® series) are CMOS quad amplifiers offering improved performance characteristics. Both devices exceed the LMC6084AIM specifications in slew rate (3.5 V/µs vs. 1.5 V/µs), gain bandwidth product (4 MHz vs. 1.3 MHz), and output current capability (140 mA vs. 34 mA per channel). Input offset voltage is superior (50 µV vs. 150 µV). These parts are ROHS3 compliant and operate across an extended temperature range (-40°C to 125°C). The AD8664ARZ-REEL7 variant is supplied in tape and reel packaging, while AD8664ARZ is supplied in tube packaging. Both are electrically identical.

General Purpose Amplifier Substitutes:

The OPA4171AQDRQ1 (Texas Instruments) is a general purpose quad amplifier with automotive qualification (AEC-Q100). It provides a gain bandwidth product of 3 MHz and operates across a wider supply voltage range (4.5 V to 36 V). This device is ROHS3 compliant and rated for extended temperature operation (-40°C to 125°C). The OPA4171AQDRQ1 is suitable for applications requiring automotive-grade reliability.

The AD8669ARZ, AD8669ARZ-REEL, and AD8669ARZ-REEL7 (Analog Devices Inc., DigiTrim® series) are general purpose quad amplifiers with lower power consumption (230 µA total supply current vs. 2.2 mA) and superior input offset voltage (40 µV vs. 150 µV). These devices operate at -40°C to 125°C and are ROHS3 compliant. The slew rate (0.3 V/µs) and gain bandwidth product (540 kHz) are lower than the LMC6084AIM, making these substitutes suitable for low-speed, low-power applications. Packaging variants include tube (AD8669ARZ), tape and reel standard (AD8669ARZ-REEL), and tape and reel 7-inch (AD8669ARZ-REEL7).

Compliance Considerations:

All substitute parts except LMC6084AIM/NOPB are ROHS3 compliant, addressing environmental and regulatory requirements. The LMC6084AIM is RoHS non-compliant. For new designs or applications subject to RoHS regulations, ROHS3-compliant substitutes are required.

Frequently Asked Questions (FAQ)

Q: Can the LMC6084AIM/NOPB be used as a direct replacement for the LMC6084AIM?

A: Yes. The LMC6084AIM/NOPB is electrically and mechanically identical to the LMC6084AIM. Both devices share the same electrical specifications, 14-SOIC package configuration, and pin assignments. The primary difference is product status: LMC6084AIM/NOPB is active and available, while LMC6084AIM is obsolete. No circuit modifications are required for this substitution.

Q: What are the key differences between the AD8664ARZ and the LMC6084AIM?

A: The AD8664ARZ is a CMOS quad amplifier that exceeds LMC6084AIM performance in multiple parameters: slew rate is 3.5 V/µs (vs. 1.5 V/µs), gain bandwidth product is 4 MHz (vs. 1.3 MHz), and output current per channel is 140 mA (vs. 34 mA). Input offset voltage is superior at 50 µV (vs. 150 µV). Both devices use the 14-SOIC package and are pin-compatible. The AD8664ARZ is ROHS3 compliant and operates across -40°C to 125°C. These enhanced specifications make the AD8664ARZ suitable for applications requiring higher speed and output drive capability.

Q: Are the AD8669ARZ variants suitable replacements for the LMC6084AIM?

A: The AD8669ARZ family is electrically compatible in terms of package and pin configuration but exhibits different performance characteristics. The slew rate (0.3 V/µs) and gain bandwidth product (540 kHz) are significantly lower than the LMC6084AIM. However, the AD8669ARZ family offers superior input offset voltage (40 µV vs. 150 µV) and substantially lower power consumption (230 µA total vs. 2.2 mA). These devices are suitable for low-speed, low-power applications where the reduced bandwidth is acceptable. The AD8669ARZ, AD8669ARZ-REEL, and AD8669ARZ-REEL7 are electrically identical; packaging differs only in format (tube vs. tape and reel).

Q: What is the difference between AD8664ARZ-REEL7 and AD8664ARZ?

A: Both devices are electrically identical CMOS quad amplifiers with identical specifications. The difference is packaging format: AD8664ARZ-REEL7 is supplied in tape and reel format (7-inch reel), while AD8664ARZ is supplied in tube packaging. Selection between these variants depends on assembly process requirements and volume considerations. Tape and reel packaging is typically used for automated pick-and-place assembly, while tube packaging is used for manual assembly or lower-volume applications.

Q: Is the OPA4171AQDRQ1 compatible with the LMC6084AIM?

A: The OPA4171AQDRQ1 is pin-compatible and uses the same 14-SOIC package as the LMC6084AIM. However, it is a general purpose amplifier rather than a CMOS amplifier. The OPA4171AQDRQ1 offers a wider supply voltage range (4.5 V to 36 V vs. 4.5 V to 15.5 V) and extended temperature operation (-40°C to 125°C vs. -40°C to 85°C). It includes automotive qualification (AEC-Q100) and is ROHS3 compliant. The gain bandwidth product is 3 MHz (vs. 1.3 MHz), providing improved frequency response. This device is suitable for applications requiring automotive-grade reliability or extended supply voltage range.

Q: Why do some substitute parts have lower slew rates than the LMC6084AIM?

A: The AD8669ARZ family has a slew rate of 0.3 V/µs, which is lower than the LMC6084AIM's 1.5 V/µs. This reflects a design trade-off prioritizing low power consumption and low noise over high-speed transient response. The AD8669ARZ family is optimized for applications where bandwidth requirements are modest and power efficiency is critical. Applications requiring the original slew rate performance should select the AD8664ARZ or maintain the LMC6084AIM/NOPB.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant except LMC6084AIM/NOPB, which has unspecified RoHS status. The original LMC6084AIM is RoHS non-compliant. For applications subject to RoHS regulations, the AD8664ARZ, AD8664ARZ-REEL7, OPA4171AQDRQ1, AD8669ARZ, AD8669ARZ-REEL, and AD8669ARZ-REEL7 are all suitable alternatives.

Q: Can the LMC6084AIM be used in applications requiring operation above 85°C?

A: The LMC6084AIM is rated for -40°C to 85°C operation. For applications requiring extended temperature operation up to 125°C, substitute parts such as AD8664ARZ, AD8664ARZ-REEL7, OPA4171AQDRQ1, AD8669ARZ, AD8669ARZ-REEL, or AD8669ARZ-REEL7 are required. All these alternatives are rated for -40°C to 125°C operation.

Q: What is the significance of the DigiTrim® series designation for Analog Devices parts?

A: DigiTrim® is an Analog Devices product series designation. The AD8664ARZ and AD8669ARZ families are part of this series. This designation indicates the product line but does not affect electrical compatibility or substitution criteria. Selection among DigiTrim® parts should be based on the specific electrical parameters required for the application.

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