LMC6022IMX Equivalent & Substitute Parts

Part Overview

The LMC6022IMX is a CMOS dual-channel operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, indicating it has reached end-of-life status and is no longer in active production. The LMC6022IMX was designed for low-power CMOS amplifier applications requiring dual-circuit integration with minimal input bias current and moderate bandwidth characteristics.

Due to its obsolete status, component sourcing becomes challenging for new designs and production runs. Identifying equivalent and substitute parts ensures design continuity, maintains supply chain reliability, and provides access to functionally compatible alternatives with improved specifications or active product status.

Key Parameters

Parameter	Value	Unit
Amplifier Type	CMOS	—
Number of Circuits	2	—
Slew Rate	0.11	V/µs
Gain Bandwidth Product	350	kHz
Current - Input Bias	0.04	pA
Voltage - Input Offset	1	mV
Current - Supply (per 2 Channels)	86	µA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	4.75	V
Voltage - Supply Span (Max)	15.5	V
Operating Temperature	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the LMC6022IMX is determined by the following critical parameters:

Mechanical Compatibility:

Package type: 8-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount
Pin count and footprint equivalence

Electrical Compatibility:

Number of circuits: 2 (dual-channel requirement)
Supply voltage range: Minimum 4.75 V to maximum 15.5 V
Output type capability: Standard or rail-to-rail output
Current output per channel: Minimum 40 mA
Operating temperature range: -40°C to 85°C

Functional Characteristics:

Amplifier type: CMOS, chopper (zero-drift), or general-purpose amplifiers
Input bias current: 0.04 pA or lower
Slew rate: 0.11 V/µs or higher
Gain bandwidth product: 350 kHz or higher

Substitute parts are grouped into three categories based on amplifier type and performance tier: direct Texas Instruments equivalents with improved compliance status, Analog Devices zero-drift chopper amplifiers with enhanced precision, and Analog Devices general-purpose amplifiers with higher bandwidth, plus Maxim Integrated CMOS alternatives with extended supply range.

Parameter Comparison

Parameter	LMC6022IMX	LMC6022IMX/NOPB	AD8639WARZ	AD8639WARZ-R7	AD8639WARZ-RL	AD8666WARZ-R7	AD8666WARZ-RL	ICL7621DCSA+	ICL7621DCSA+T	ICL7621DESA+
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim
Amplifier Type	CMOS	CMOS	Chopper (Zero-Drift)	Chopper (Zero-Drift)	Chopper (Zero-Drift)	General Purpose	General Purpose	CMOS	CMOS	CMOS
Number of Circuits	2	2	2	2	2	2	2	2	2	2
Output Type	—	—	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	0.11	0.11	2	2	2	3.5	3.5	1.6	1.6	1.6
Gain Bandwidth Product (kHz)	350	350	1500	1500	1500	4000	4000	1400	1400	1400
Current - Input Bias (pA)	0.04	0.04	1	1	1	0.2	0.2	1	1	1
Voltage - Input Offset (mV)	1	1	0.003	0.003	0.003	0.6	0.6	15	15	15
Current - Supply per 2 Channels (mA)	0.086	0.086	1.25	1.25	1.25	1.15	1.15	1	1	1
Current - Output / Channel (mA)	40	40	37	37	37	140	140	—	—	—
Voltage - Supply Span Min (V)	4.75	4.75	5	5	5	5	5	2	2	2
Voltage - Supply Span Max (V)	15.5	15.5	16	16	16	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	0 to 70	0 to 70	-40 to 85
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Last Time Buy	Active	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	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Recommended for Immediate Replacement):

LMC6022IMX/NOPB is the direct equivalent manufactured by Texas Instruments. This part maintains identical electrical specifications and 8-SOIC package compatibility. The primary advantage is upgraded RoHS3 compliance status and Last Time Buy product status, providing extended availability compared to the obsolete LMC6022IMX. This selection is appropriate for designs requiring no performance changes and maximum compatibility with existing layouts.

Precision Alternative (Zero-Drift Chopper Amplifiers):

AD8639WARZ, AD8639WARZ-R7, and AD8639WARZ-RL are Analog Devices chopper (zero-drift) amplifiers offering significantly improved input offset voltage (3 µV versus 1 mV) and higher slew rate (2 V/µs versus 0.11 V/µs). These parts are active products with ROHS3 compliance and extended operating temperature range (-40°C to 125°C). Selection of these parts is appropriate for applications requiring enhanced precision and lower offset drift over temperature. All three variants share identical electrical specifications; packaging differences (tube versus tape & reel) determine selection based on procurement requirements.

High-Performance Alternative (General-Purpose Amplifiers):

AD8666WARZ-R7 and AD8666WARZ-RL are Analog Devices general-purpose amplifiers providing the highest slew rate (3.5 V/µs) and gain bandwidth product (4 MHz) among available substitutes. These parts deliver significantly higher output current capability (140 mA per channel versus 40 mA). Selection is appropriate for applications requiring higher bandwidth, faster transient response, or increased output drive capability. Both variants are active products with ROHS3 compliance and extended temperature range.

Extended Supply Range Alternative (CMOS Amplifiers):

ICL7621DCSA+, ICL7621DCSA+T, and ICL7621DESA+ are Analog Devices/Maxim Integrated CMOS amplifiers offering the widest supply voltage range (2 V to 16 V minimum versus 4.75 V for LMC6022IMX). These parts are active products with ROHS3 compliance. ICL7621DCSA+ and ICL7621DCSA+T are functionally identical with operating temperature range 0°C to 70°C. ICL7621DESA+ extends the operating temperature range to -40°C to 85°C, matching the original LMC6022IMX specification. Selection of ICL7621 variants is appropriate for low-voltage applications or designs requiring operation below 4.75 V supply voltage.

Compliance Consideration:

All substitute parts listed are ROHS3 compliant, addressing environmental and regulatory requirements that the obsolete LMC6022IMX does not meet. New designs should prioritize ROHS3-compliant alternatives to ensure long-term supply chain viability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LMC6022IMX with LMC6022IMX/NOPB without circuit modifications?

A: Yes. LMC6022IMX/NOPB is the direct equivalent with identical electrical specifications, pin configuration, and 8-SOIC package. The only differences are improved RoHS3 compliance status and Last Time Buy product status. No circuit modifications are required.

Q: What is the primary difference between AD8639WARZ and AD8666WARZ alternatives?

A: AD8639WARZ is a chopper (zero-drift) amplifier optimized for precision applications with extremely low input offset voltage (3 µV) and moderate bandwidth (1.5 MHz). AD8666WARZ is a general-purpose amplifier with higher bandwidth (4 MHz), faster slew rate (3.5 V/µs), and significantly higher output current (140 mA per channel). Selection depends on whether precision or bandwidth is the primary design requirement.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All substitute parts listed are housed in 8-SOIC (0.154", 3.90mm Width) surface mount packages, ensuring mechanical and footprint compatibility with the original LMC6022IMX design.

Q: Which substitute part has the lowest supply voltage requirement?

A: ICL7621DCSA+, ICL7621DCSA+T, and ICL7621DESA+ support minimum supply voltage of 2 V, compared to 4.75 V for LMC6022IMX. These parts are suitable for low-voltage applications or battery-powered designs operating below 4.75 V.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. All substitute parts listed are ROHS3 compliant. The original LMC6022IMX is RoHS non-compliant. New designs should specify RoHS3-compliant alternatives to meet current environmental and regulatory requirements.

Q: What is the operating temperature range difference between substitutes?

A: LMC6022IMX and ICL7621DESA+ operate from -40°C to 85°C. ICL7621DCSA+ and ICL7621DCSA+T operate from 0°C to 70°C (narrower range). AD8639WARZ variants and AD8666WARZ variants extend to -40°C to 125°C (wider range). Selection depends on the application's temperature requirements.

Q: Can I use AD8639WARZ in place of LMC6022IMX if my circuit requires the lowest possible input offset voltage?

A: Yes. AD8639WARZ provides input offset voltage of 3 µV compared to 1 mV for LMC6022IMX, representing a 333-fold improvement. This substitution is appropriate for precision measurement or instrumentation applications where offset drift is critical. The 8-SOIC package and dual-circuit configuration ensure pin-level compatibility.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in tube packaging (standard) or tape & reel (TR) packaging. Tube packaging is suitable for lower-volume applications or manual assembly. Tape & reel packaging is optimized for high-volume automated assembly. Part numbers ending in "T" or "-RL" indicate tape & reel packaging; parts without these suffixes indicate tube packaging.

Q: Is the slew rate difference between LMC6022IMX (0.11 V/µs) and AD8666WARZ (3.5 V/µs) significant for typical applications?

A: Yes. The 32-fold increase in slew rate directly impacts the amplifier's ability to respond to rapid signal changes. Applications involving high-frequency signals, fast transient response, or high-speed signal conditioning benefit from higher slew rate. Low-speed applications (below 10 kHz) are generally unaffected by this difference.

Q: Which substitute part provides the highest output current capability?

A: AD8666WARZ-R7 and AD8666WARZ-RL provide 140 mA per channel output current, compared to 40 mA for LMC6022IMX. This 3.5-fold increase is suitable for applications requiring direct drive of capacitive loads or low-impedance outputs without additional buffering stages.

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