LMC6084IMX Equivalent & Substitute Parts

Part Overview

The LMC6084IMX is a CMOS operational amplifier featuring four independent circuits in a 14-SOIC surface mount package. Manufactured by Texas Instruments under the LMC® series, this device provides push-pull, rail-to-rail output capability with low input bias current and moderate bandwidth characteristics. The part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the 14-SOIC package format and support the electrical operating parameters of the original specification.

Key Parameters

Parameter	Value	Unit
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	—
Voltage - Supply Span (Min)	4.5	V
Voltage - Supply Span (Max)	15.5	V
Operating Temperature	-40 to 85	°C
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

Substitute Part Grouping Explanation

Substitution of the LMC6084IMX is determined by the following critical parameters: package format (14-SOIC), number of circuits (4), output configuration (rail-to-rail capability), and supply voltage range compatibility (minimum 4.5 V to maximum 15.5 V). All identified substitute parts maintain the 14-SOIC package and four-circuit configuration. Substitutes are grouped into two categories based on amplifier type and performance characteristics:

Category 1: Direct Packaging Variant LMC6084IMX/NOPB represents the same base device (LMC6084) with identical electrical specifications but supplied in Tape & Reel packaging and RoHS3 compliance. This variant is functionally interchangeable with identical performance parameters.

Category 2: Higher Performance CMOS Alternatives (Analog Devices AD8664 Series) AD8664ARZ and AD8664ARZ-REEL7 provide enhanced performance with 3.5 V/µs slew rate, 4 MHz gain bandwidth product, and 140 mA output current per channel. These devices maintain CMOS amplifier type, rail-to-rail output, and 14-SOIC package compatibility. Supply voltage range is 5 V to 16 V, which overlaps the LMC6084IMX operating window.

Category 3: General Purpose Amplifier Alternatives (Analog Devices AD8669 Series) AD8669ARZ, AD8669ARZ-REEL, and AD8669ARZ-REEL7 are general purpose operational amplifiers with rail-to-rail output in 14-SOIC package. These devices feature lower slew rate (0.3 V/µs) and reduced output current (50 mA per channel) but maintain supply voltage compatibility (5 V to 16 V) and lower quiescent current (230 µA total).

Category 4: General Purpose Amplifier Alternatives (Microchip MCP6H04 Series) MCP6H04-E/SL and MCP6H04T-E/SL are general purpose operational amplifiers with rail-to-rail output in 14-SOIC package. These devices support extended minimum supply voltage (3.5 V) and feature 0.8 V/µs slew rate with 1.2 MHz gain bandwidth product. Output current is 50 mA per channel with 135 µA total quiescent current.

Parameter Comparison

Parameter	LMC6084IMX	LMC6084IMX/NOPB	AD8664ARZ	AD8664ARZ-REEL7	AD8669ARZ	AD8669ARZ-REEL7	MCP6H04-E/SL	MCP6H04T-E/SL
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Microchip	Microchip
Amplifier Type	CMOS	CMOS	CMOS	CMOS	General Purpose	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
Voltage - Supply Span (Min)	4.5 V	4.5 V	5 V	5 V	5 V	5 V	3.5 V	3.5 V
Voltage - Supply Span (Max)	15.5 V	15.5 V	16 V	16 V	16 V	16 V	16 V	16 V
Operating Temperature	-40 to 85°C	-40 to 85°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C
Slew Rate	1.5 V/µs	1.5 V/µs	3.5 V/µs	3.5 V/µs	0.3 V/µs	0.3 V/µs	0.8 V/µs	0.8 V/µs
Gain Bandwidth Product	1.3 MHz	1.3 MHz	4 MHz	4 MHz	540 kHz	540 kHz	1.2 MHz	1.2 MHz
Current - Input Bias	0.01 pA	0.01 pA	0.3 pA	0.3 pA	0.3 pA	0.3 pA	10 pA	10 pA
Voltage - Input Offset	150 µV	150 µV	50 µV	50 µV	40 µV	40 µV	700 µV	700 µV
Current - Supply (x4 Channels)	2.2 mA	2.2 mA	1.25 mA	1.25 mA	230 µA	230 µA	135 µA	135 µA
Current - Output / Channel	34 mA	34 mA	140 mA	140 mA	50 mA	50 mA	50 mA	50 mA
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Identical Specifications: LMC6084IMX/NOPB is the primary substitute when exact electrical performance matching is required. This variant maintains all electrical parameters of the original LMC6084IMX while providing active product status and RoHS3 compliance. The transition from tube to Tape & Reel packaging accommodates automated assembly processes.

For Enhanced Performance Applications: AD8664ARZ and AD8664ARZ-REEL7 are suitable when higher slew rate (3.5 V/µs versus 1.5 V/µs) and increased gain bandwidth product (4 MHz versus 1.3 MHz) are beneficial. These devices provide 4× higher output current capability (140 mA per channel) and extended operating temperature range (-40°C to 125°C). Supply voltage minimum increases to 5 V, which remains compatible with most 4.5 V to 15.5 V system designs. Active product status and RoHS3 compliance ensure long-term availability.

For Low Power Applications: AD8669ARZ, AD8669ARZ-REEL, and AD8669ARZ-REEL7 reduce total supply current to 230 µA across four channels, compared to 2.2 mA for the LMC6084IMX. These general purpose amplifiers maintain rail-to-rail output and 14-SOIC package compatibility. Reduced slew rate (0.3 V/µs) and lower output current (50 mA per channel) are appropriate for signal conditioning and low-frequency applications. Extended operating temperature range and RoHS3 compliance support production continuity.

For Extended Supply Voltage Range: MCP6H04-E/SL and MCP6H04T-E/SL support minimum supply voltage of 3.5 V, enabling operation in systems with lower supply rails. These general purpose amplifiers provide 1.2 MHz gain bandwidth product and 0.8 V/µs slew rate. Total quiescent current is 135 µA per four channels. RoHS3 compliance and active product status ensure availability. The higher input offset voltage (700 µV) requires evaluation in precision applications.

All substitute parts maintain the 14-SOIC surface mount package and four-circuit configuration. Selection should be based on specific application requirements for slew rate, output current, supply voltage range, and power consumption. All identified substitutes carry active product status and RoHS3 compliance, supporting regulatory and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can LMC6084IMX/NOPB be used as a direct replacement for LMC6084IMX?

A: Yes. LMC6084IMX/NOPB maintains identical electrical specifications including slew rate (1.5 V/µs), gain bandwidth product (1.3 MHz), supply voltage range (4.5 V to 15.5 V), and output current (34 mA per channel). The primary difference is packaging format (Tape & Reel versus tube) and product status (Active versus Obsolete). RoHS3 compliance of the /NOPB variant provides regulatory advantage.

Q: What are the key differences between CMOS and General Purpose amplifier types in the substitute list?

A: CMOS amplifiers (LMC6084IMX, AD8664ARZ series) feature extremely low input bias current (0.01 to 0.3 pA) and are optimized for high-impedance input applications. General Purpose amplifiers (AD8669ARZ series, MCP6H04 series) provide lower quiescent current and are suitable for general signal conditioning. The LMC6084IMX is CMOS type; substitutes include both CMOS and General Purpose options depending on application requirements.

Q: Are all substitute parts compatible with the 4.5 V minimum supply voltage of the LMC6084IMX?

A: No. AD8664ARZ, AD8664ARZ-REEL7, AD8669ARZ, and AD8669ARZ-REEL7 require minimum 5 V supply voltage. MCP6H04-E/SL and MCP6H04T-E/SL support 3.5 V minimum, which is lower than the original specification. For systems operating at 4.5 V, only LMC6084IMX/NOPB provides guaranteed compatibility. Verify supply voltage requirements before selection.

Q: What is the significance of the -REEL7 and -REEL designations?

A: These designations indicate Tape & Reel packaging format with specific reel specifications. -REEL7 and -REEL variants are functionally identical to tube-packaged equivalents (AD8664ARZ, AD8669ARZ) but supplied in continuous tape format for automated assembly. Selection between tube and Tape & Reel depends on manufacturing process requirements.

Q: How does output current capability affect substitution decisions?

A: The LMC6084IMX provides 34 mA per channel output current. AD8664ARZ series offers 140 mA per channel, suitable for driving higher impedance loads or multiple stages. AD8669ARZ and MCP6H04 series provide 50 mA per channel. Applications requiring output current exceeding 34 mA should specify AD8664ARZ variants. Lower-current applications can use any substitute without limitation.

Q: What is the impact of operating temperature range differences?

A: The LMC6084IMX operates from -40°C to 85°C. All substitute parts extend to -40°C to 125°C, providing wider temperature margin. This extended range is advantageous for industrial and automotive applications. If the original design operates within -40°C to 85°C limits, the extended range of substitutes provides additional design margin without penalty.

Q: Can AD8669ARZ be used in applications requiring 1.3 MHz bandwidth?

A: No. AD8669ARZ provides 540 kHz gain bandwidth product, which is insufficient for applications requiring 1.3 MHz bandwidth. For bandwidth-critical applications, use LMC6084IMX/NOPB (1.3 MHz) or AD8664ARZ series (4 MHz). MCP6H04 series provides 1.2 MHz, which is marginally compatible with 1.3 MHz requirement.

Q: What is the RoHS compliance status of the original LMC6084IMX?

A: The LMC6084IMX is RoHS non-compliant. All substitute parts are RoHS3 compliant, meeting current regulatory requirements for new designs and production. This compliance advantage supports market access and supply chain continuity.

Q: How does input offset voltage affect circuit performance?

A: The LMC6084IMX specifies 150 µV input offset voltage. AD8664ARZ provides 50 µV, AD8669ARZ provides 40 µV, and MCP6H04 provides 700 µV. Lower offset voltage reduces DC error in precision applications. For general signal conditioning, offset voltage differences are typically negligible. Precision instrumentation should prioritize AD8669ARZ or AD8664ARZ variants.

Q: Are all substitute parts available in the same 14-SOIC package?

A: Yes. All identified substitute parts use 14-SOIC (0.154", 3.90mm Width) surface mount package, ensuring PCB layout compatibility. No redesign of printed circuit board footprints is required for substitution.

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