LMC6061IMX Equivalent & Substitute Parts

Part Overview

The LMC6061IMX is a general-purpose operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface-mount package. This device features rail-to-rail output capability and is designed for low-power applications requiring single-circuit amplification. The LMC6061IMX carries a "Not For New Designs" product status, indicating that Texas Instruments no longer recommends this component for new circuit development. Identifying equivalent and substitute parts is necessary to support legacy system maintenance and to enable migration to actively supported alternatives that meet current design standards and compliance requirements.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Package / Case	8-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 Range	-40 to 85	°C
Slew Rate	0.035	V/µs
Gain Bandwidth Product	100	kHz
Current - Input Bias	0.01	pA
Voltage - Input Offset	100	µV
Current - Supply	24	µA
Current - Output / Channel	26	mA
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LMC6061IMX is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: General Purpose
Number of Circuits: 1
Output Type: Rail-to-Rail
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Voltage - Supply Span (Min): 4.5 V or lower
Voltage - Supply Span (Max): 15.5 V or higher
Operating Temperature Range: -40°C to 85°C minimum

Substitute Parts Identified:

Group 1: Direct Equivalent (Texas Instruments)

LMC6061IMX/NOPB: Identical electrical specifications to LMC6061IMX with identical packaging. Differs only in product status (Active vs. Not For New Designs) and RoHS compliance (ROHS3 Compliant vs. non-compliant). Packaging format is Tape & Reel (TR).

Group 2: Functional Equivalents (Analog Devices Inc., DigiTrim® Series)

AD8661ARZ, AD8661ARZ-REEL, AD8661ARZ-REEL7: All share identical package, mounting type, and supply voltage range. These parts exceed the LMC6061IMX in slew rate (3.5 V/µs vs. 0.035 V/µs), gain bandwidth product (4 MHz vs. 100 kHz), input bias current (0.3 pA vs. 0.01 pA), and output current capability (140 mA vs. 26 mA). Operating temperature range extends to 125°C. All are Active status and ROHS3 compliant.
AD8663ARZ, AD8663ARZ-REEL, AD8663ARZ-REEL7: All share identical package, mounting type, and supply voltage range. These parts exceed the LMC6061IMX in slew rate (0.3 V/µs vs. 0.035 V/µs), gain bandwidth product (540 kHz vs. 100 kHz), input offset voltage (40 µV vs. 100 µV), and output current capability (50 mA vs. 26 mA). Operating temperature range extends to 125°C. All are Active status and ROHS3 compliant.

Parameter Comparison

Parameter	LMC6061IMX	LMC6061IMX/NOPB	AD8661ARZ	AD8661ARZ-REEL	AD8661ARZ-REEL7	AD8663ARZ	AD8663ARZ-REEL	AD8663ARZ-REEL7
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1	1	1	1
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
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
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	5 V	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 Range	-40°C to 85°C	-40°C to 85°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Slew Rate	0.035 V/µs	0.035 V/µs	3.5 V/µs	3.5 V/µs	3.5 V/µs	0.3 V/µs	0.3 V/µs	0.3 V/µs
Gain Bandwidth Product	100 kHz	100 kHz	4 MHz	4 MHz	4 MHz	540 kHz	540 kHz	540 kHz
Current - Input Bias	0.01 pA	0.01 pA	0.3 pA	0.3 pA	0.3 pA	0.3 pA	0.3 pA	0.3 pA
Voltage - Input Offset	100 µV	100 µV	50 µV	50 µV	50 µV	40 µV	40 µV	40 µV
Current - Supply	24 µA	24 µA	1.25 mA	1.25 mA	1.25 mA	230 µA	230 µA	230 µA
Current - Output / Channel	26 mA	26 mA	140 mA	140 mA	140 mA	50 mA	50 mA	50 mA
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Bulk	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tube	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

LMC6061IMX/NOPB is the direct equivalent of LMC6061IMX. Both parts share identical electrical specifications, package geometry, and pin configuration. The primary distinction is product status and compliance: LMC6061IMX/NOPB carries Active status and ROHS3 compliance, whereas LMC6061IMX is marked "Not For New Designs" and is RoHS non-compliant. Selection of LMC6061IMX/NOPB is appropriate for legacy system maintenance where electrical performance must remain unchanged. This part is available in Tape & Reel packaging format.

For Migration to Actively Supported Alternatives:

The Analog Devices AD8661 and AD8663 series (all variants: ARZ, ARZ-REEL, ARZ-REEL7) are actively supported alternatives. All variants maintain the same 8-SOIC package and surface-mount configuration, ensuring mechanical compatibility with existing PCB layouts.

AD8661 Series Selection Criteria:

Select when higher slew rate (3.5 V/µs) and higher gain bandwidth product (4 MHz) are required or acceptable.
Select when higher output current capability (140 mA) is needed.
Select when extended operating temperature range to 125°C is required.
All AD8661 variants are ROHS3 compliant and Active status.

AD8663 Series Selection Criteria:

Select when moderate performance improvement is needed without the higher power consumption of AD8661.
Slew rate (0.3 V/µs) and gain bandwidth product (540 kHz) provide intermediate performance between LMC6061IMX and AD8661.
Current supply (230 µA) is significantly higher than LMC6061IMX (24 µA) but lower than AD8661 (1.25 mA).
Output current capability (50 mA) exceeds LMC6061IMX (26 mA).
All AD8663 variants are ROHS3 compliant and Active status.

Packaging Format Selection:

Tube packaging: AD8661ARZ, AD8663ARZ. Suitable for manual assembly or small-volume production.
Tape & Reel (TR): LMC6061IMX/NOPB, AD8661ARZ-REEL, AD8663ARZ-REEL. Standard for automated assembly lines.
Cut Tape (CT) & Digi-Reel®: AD8661ARZ-REEL7, AD8663ARZ-REEL7. Highest inventory availability and suitable for both manual and automated assembly.

Compliance Considerations: All substitute parts listed carry ROHS3 compliance and Active product status, supporting current design standards and long-term supply chain reliability. The LMC6061IMX itself is RoHS non-compliant and not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can LMC6061IMX/NOPB be used as a direct drop-in replacement for LMC6061IMX?

A: Yes. LMC6061IMX/NOPB is electrically and mechanically identical to LMC6061IMX. Both parts have the same pin configuration, electrical specifications, and 8-SOIC package dimensions. The only differences are product status (Active vs. Not For New Designs) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What are the key differences between the AD8661 and AD8663 series?

A: Both series maintain the same 8-SOIC package and supply voltage range as the LMC6061IMX. The AD8661 offers higher slew rate (3.5 V/µs vs. 0.3 V/µs) and higher gain bandwidth product (4 MHz vs. 540 kHz), resulting in faster signal response. The AD8661 also provides higher output current (140 mA vs. 50 mA) but consumes more supply current (1.25 mA vs. 230 µA). The AD8663 provides a middle ground between the LMC6061IMX and AD8661 in terms of performance and power consumption.

Q: Are all substitute parts compatible with the existing PCB layout?

A: Yes. All substitute parts listed use the 8-SOIC (0.154", 3.90mm Width) package with surface-mount configuration. Pin count and spacing are identical, ensuring direct PCB compatibility without layout modifications.

Q: What is the difference between Tape & Reel, Tube, and Cut Tape & Digi-Reel® packaging?

A: These are packaging and delivery formats that do not affect electrical performance. Tape & Reel (TR) is standard for high-volume automated assembly. Tube packaging is used for lower volumes and manual assembly. Cut Tape (CT) & Digi-Reel® combines the benefits of both formats and typically offers the highest inventory availability. Selection depends on production volume and assembly method, not circuit function.

Q: Can I use AD8661 or AD8663 in a circuit designed for LMC6061IMX without circuit modifications?

A: Electrical compatibility exists because all parts share the same package, pin configuration, and supply voltage range. However, the AD8661 and AD8663 have different electrical characteristics (higher slew rate, higher gain bandwidth product, different input offset voltage, different supply current). Circuit behavior may change. Applications sensitive to these parameters (such as precision analog circuits, low-power battery-operated systems, or high-frequency signal processing) require circuit analysis and potential redesign. Applications with relaxed performance requirements may tolerate substitution without modification.

Q: Why is the LMC6061IMX marked "Not For New Designs"?

A: This designation indicates that Texas Instruments no longer recommends this component for new circuit development. The part remains available for legacy system support, but new designs should use actively supported alternatives such as LMC6061IMX/NOPB or the Analog Devices AD8661/AD8663 series.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates that the component meets the Restriction of Hazardous Substances Directive, restricting the use of specific hazardous materials (lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers). ROHS3-compliant parts are required for many applications, particularly in consumer electronics and regulated industries. The LMC6061IMX is RoHS non-compliant, while all listed substitutes are ROHS3 compliant.

Q: Which substitute part has the highest inventory availability?

A: AD8663ARZ-REEL7 has the highest inventory at 12,800 pieces. AD8661ARZ-REEL7 has 4,620 pieces. Both Cut Tape & Digi-Reel® variants offer substantial availability for immediate procurement.

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