LMC6044IMX Equivalent & Substitute Parts

Part Overview

The LMC6044IMX is a CMOS quad operational amplifier manufactured by Texas Instruments, featuring push-pull, rail-to-rail output configuration in a 14-SOIC surface mount package. This device is classified as obsolete product status, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The LMC6044IMX operates across a 4.5V to 15.5V supply range with ultra-low input bias current of 0.002 pA, making it suitable for precision analog signal conditioning applications requiring minimal input loading.

Key Parameters

Parameter	Value
Manufacturer Part Number	LMC6044IMX
Manufacturer	Texas Instruments
Category	Linear, Amplifiers
Package / Case	14-SOIC (0.154", 3.90mm Width)
Amplifier Type	CMOS
Number of Circuits	4
Output Type	Push-Pull, Rail-to-Rail
Voltage - Supply Span (Min)	4.5 V
Voltage - Supply Span (Max)	15.5 V
Operating Temperature	-40°C ~ 85°C (TJ)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the LMC6044IMX is determined by the following critical parameters that must align across candidate parts:

Mechanical Compatibility:

Package type: 14-SOIC surface mount configuration
Package dimensions: 0.154" width (3.90mm)
Pin count and pinout: 14-pin SOIC

Electrical Compatibility:

Number of circuits: 4 independent amplifier channels
Output configuration: Rail-to-rail capability
Supply voltage range: Minimum 4.5V, maximum 15.5V
Operating temperature range: -40°C to 85°C minimum

Functional Characteristics:

Input bias current: 0.002 pA (ultra-low specification)
Voltage input offset: 1 mV
Output current per channel: 40 mA
Supply current: 52µA across 4 channels

Substitute parts are grouped into two categories: direct equivalents maintaining identical electrical specifications, and functional alternatives offering enhanced performance characteristics while maintaining mechanical and basic electrical compatibility.

Parameter Comparison

Parameter	LMC6044IMX	LMC6044IMX/NOPB	AD8668ARZ	AD8668ARZ-REEL	AD8668ARZ-REEL7
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active
Amplifier Type	CMOS	CMOS	General Purpose	General Purpose	General Purpose
Number of Circuits	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
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Voltage - Supply Span (Min)	4.5 V	4.5 V	5 V	5 V	5 V
Voltage - Supply Span (Max)	15.5 V	15.5 V	16 V	16 V	16 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Slew Rate	0.02 V/µs	0.02 V/µs	3.5 V/µs	3.5 V/µs	3.5 V/µs
Gain Bandwidth Product	100 kHz	100 kHz	4 MHz	4 MHz	4 MHz
Current - Input Bias	0.002 pA	0.002 pA	0.2 pA	0.2 pA	0.2 pA
Voltage - Input Offset	1 mV	1 mV	600 µV	600 µV	600 µV
Current - Supply	52 µA (x4)	52 µA (x4)	1.15 mA (x4)	1.15 mA (x4)	1.15 mA (x4)
Current - Output / Channel	40 mA	40 mA	140 mA	140 mA	140 mA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tape & Reel (TR)
Inventory Status	1594 Pcs	3224 Pcs	2200 Pcs	1900 Pcs	61000 Pcs

Engineering Selection Recommendations

Direct Equivalent - LMC6044IMX/NOPB:

The LMC6044IMX/NOPB represents the direct equivalent to the obsolete LMC6044IMX. This part maintains identical electrical specifications including CMOS amplifier type, 0.02V/µs slew rate, 100 kHz gain bandwidth product, 0.002 pA input bias current, and 40 mA output current per channel. The primary distinction is product status: LMC6044IMX/NOPB is active and carries ROHS3 compliance certification, whereas the original LMC6044IMX is obsolete and RoHS non-compliant. Both parts operate across the 4.5V to 15.5V supply range and -40°C to 85°C temperature range. The /NOPB suffix indicates lead-free, halogen-free packaging. For applications requiring exact electrical performance matching, LMC6044IMX/NOPB is the recommended direct replacement with superior compliance status and ongoing manufacturer support.

Functional Alternative - AD8668ARZ Series (Analog Devices Inc.):

The AD8668ARZ, AD8668ARZ-REEL, and AD8668ARZ-REEL7 represent functional alternatives manufactured by Analog Devices Inc. These parts share the 14-SOIC package configuration, quad-channel architecture, and rail-to-rail output capability. All three variants are active products with ROHS3 compliance and extended operating temperature range (-40°C to 125°C). The AD8668 series differs in performance characteristics: slew rate of 3.5V/µs (175× faster than LMC6044IMX), gain bandwidth product of 4 MHz (40× higher), input bias current of 0.2 pA (100× higher), and output current of 140 mA per channel (3.5× higher). Supply voltage range is 5V to 16V, which overlaps the LMC6044IMX range above 5V. These devices are suitable for applications where enhanced bandwidth, faster slew rate, and higher output drive capability provide system benefits. The three AD8668 variants differ only in packaging: AD8668ARZ in tube, AD8668ARZ-REEL and AD8668ARZ-REEL7 in tape and reel configurations with significantly higher inventory availability (61000 pcs for REEL7 variant).

Compliance and Regulatory Status:

All substitute parts carry ROHS3 compliance certification, addressing regulatory requirements that the obsolete LMC6044IMX does not meet. REACH status is unaffected across all parts. ECCN classification remains EAR99 for all variants. MSL rating is 1 (Unlimited) across all parts, indicating no moisture sensitivity constraints during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can LMC6044IMX/NOPB be used as a direct drop-in replacement for LMC6044IMX?

A: Yes. LMC6044IMX/NOPB maintains identical electrical specifications, pin configuration, and 14-SOIC package dimensions. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required for substitution.

Q: What are the key differences between LMC6044IMX and AD8668ARZ?

A: Both devices are quad-channel, rail-to-rail operational amplifiers in 14-SOIC packages. LMC6044IMX is a CMOS amplifier with 0.02V/µs slew rate and 100 kHz bandwidth, optimized for ultra-low input bias current (0.002 pA) and low supply current (52µA total). AD8668ARZ is a general-purpose amplifier with 3.5V/µs slew rate and 4 MHz bandwidth, offering higher output current (140 mA vs. 40 mA per channel) and extended temperature range (-40°C to 125°C vs. -40°C to 85°C). Supply voltage minimum differs: LMC6044IMX operates from 4.5V, AD8668ARZ from 5V.

Q: Which substitute part should be selected for battery-powered applications?

A: LMC6044IMX/NOPB is the appropriate choice for battery-powered applications. It maintains the original ultra-low supply current specification of 52µA across four channels, compared to 1.15mA for the AD8668ARZ series. This 22× reduction in supply current directly extends battery life in portable designs.

Q: Are the AD8668ARZ variants (tube, REEL, REEL7) electrically identical?

A: Yes. AD8668ARZ, AD8668ARZ-REEL, and AD8668ARZ-REEL7 are electrically identical. Differences are limited to packaging format (tube vs. tape and reel) and inventory quantities. Selection between variants depends on procurement volume and assembly line requirements.

Q: What is the minimum supply voltage for AD8668ARZ substitution?

A: AD8668ARZ requires minimum 5V supply voltage, compared to 4.5V for LMC6044IMX. Applications operating below 5V cannot use AD8668ARZ as a substitute. LMC6044IMX/NOPB maintains the 4.5V minimum specification and is required for such applications.

Q: Can AD8668ARZ be used in applications requiring 0.002 pA input bias current specification?

A: No. AD8668ARZ specifies 0.2 pA input bias current, which is 100 times higher than LMC6044IMX. Applications with stringent input bias current requirements must use LMC6044IMX/NOPB to maintain the 0.002 pA specification.

Q: What is the temperature operating range difference between LMC6044IMX and AD8668ARZ?

A: LMC6044IMX operates from -40°C to 85°C junction temperature. AD8668ARZ extends this range to -40°C to 125°C, providing 40°C additional high-temperature margin. Applications requiring operation above 85°C must use AD8668ARZ or equivalent extended-temperature devices.

Q: Is RoHS compliance required for the substitute part selection?

A: LMC6044IMX is RoHS non-compliant. All substitute parts (LMC6044IMX/NOPB and AD8668ARZ series) carry ROHS3 compliance certification. Applications subject to RoHS regulatory requirements must use compliant substitutes.

Q: What packaging format should be selected for high-volume production?

A: For high-volume production, AD8668ARZ-REEL7 offers the highest inventory availability (61000 pcs) in tape and reel format, optimizing assembly line efficiency. LMC6044IMX/NOPB is available in tape and reel format with 3224 pcs inventory. Tube packaging (LMC6044IMX/NOPB alternative or AD8668ARZ) is suitable for lower-volume or prototype applications.

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