LMC660CMX CMOS Amplifier Equivalent & Substitute Parts

Part Overview

The LMC660CMX is a CMOS operational amplifier IC 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 configuration with low input bias current and moderate bandwidth characteristics. The LMC660CMX is classified as obsolete product status, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain compatibility across electrical performance parameters, mechanical packaging, and supply voltage specifications to ensure direct replacement capability.

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)	—
Slew Rate	1.1	V/µs
Gain Bandwidth Product	1.4	MHz
Current - Input Bias	0.002	pA
Voltage - Input Offset	1	mV
Current - Supply	1.5	mA (x4 Channels)
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	4.75	V
Voltage - Supply Span (Max)	15.5	V
Operating Temperature	0 to 70	°C
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the LMC660CMX is determined by strict adherence to the following electrical and mechanical criteria:

Primary Substitution Criteria:

Package compatibility: 14-SOIC form factor (0.154", 3.90mm Width)
Circuit count: Four independent amplifier circuits
Output configuration: Rail-to-rail capability
Supply voltage range: Minimum 4.75 V to maximum 15.5 V overlap
Mounting type: Surface mount technology

Substitution Categories:

Direct Equivalent (Identical Specifications): LMC660CMX/NOPB maintains all electrical parameters and specifications of the original part while offering active product status and RoHS3 compliance. This part represents the primary direct replacement with identical slew rate (1.1 V/µs), gain bandwidth product (1.4 MHz), and output current rating (40 mA per channel).

Enhanced Performance Alternatives (Analog Devices AD8664 Series): AD8664ARZ and AD8664ARZ-REEL7 provide improved electrical performance characteristics including higher slew rate (3.5 V/µs), increased gain bandwidth product (4 MHz), and higher output current capability (140 mA per channel). These parts maintain the 14-SOIC package and rail-to-rail output configuration while extending operating temperature range to -40°C to 125°C. Supply voltage range (5 V to 16 V) encompasses the original specification.

General Purpose Alternatives (Analog Devices AD8669 Series): AD8669ARZ, AD8669ARZ-REEL, and AD8669ARZ-REEL7 offer general purpose amplifier functionality in the same 14-SOIC package with rail-to-rail output. These parts feature lower slew rate (0.3 V/µs) and reduced gain bandwidth product (540 kHz) but provide significantly lower supply current (230 µA per channel) and extended operating temperature range (-40°C to 125°C).

Alternative Manufacturer Option (onsemi MC33204DR2G): MC33204DR2G provides general purpose amplifier functionality with four circuits in 14-SOIC package. This part features different electrical characteristics including higher input bias current (80 nA), lower minimum supply voltage (1.8 V), and reduced maximum supply voltage (12 V), requiring verification of supply voltage compatibility in target applications.

Parameter Comparison

Parameter	LMC660CMX	LMC660CMX/NOPB	AD8664ARZ	AD8664ARZ-REEL7	AD8669ARZ	AD8669ARZ-REEL7	MC33204DR2G
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices	Analog Devices	Analog Devices	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Amplifier Type	CMOS	CMOS	CMOS	CMOS	General Purpose	General Purpose	General Purpose
Number of Circuits	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
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Slew Rate (V/µs)	1.1	1.1	3.5	3.5	0.3	0.3	1.0
Gain Bandwidth Product (MHz)	1.4	1.4	4	4	0.54	0.54	2.2
Current - Input Bias (pA)	0.002	0.002	0.3	0.3	0.3	0.3	80 nA
Voltage - Input Offset (mV)	1	1	0.05	0.05	0.04	0.04	10
Current - Supply (mA x4 Channels)	1.5	1.5	1.25	1.25	0.23	0.23	0.9
Current - Output / Channel (mA)	40	40	140	140	50	50	80
Voltage - Supply Span Min (V)	4.75	4.75	5	5	5	5	1.8
Voltage - Supply Span Max (V)	15.5	15.5	16	16	16	16	12
Operating Temperature (°C)	0 to 70	0 to 70	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 105
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement with Active Product Status:

LMC660CMX/NOPB is the primary recommended substitute. This part maintains identical electrical specifications and performance characteristics while transitioning from obsolete to active product status. The part is RoHS3 compliant and available in Cut Tape and Digi-Reel packaging options, supporting both manual and automated assembly processes. Selection of this part eliminates design modification requirements and ensures pin-for-pin compatibility.

For Enhanced Performance Requirements:

AD8664ARZ and AD8664ARZ-REEL7 provide superior electrical performance with 3.5 V/µs slew rate and 4 MHz gain bandwidth product, representing 3.2× and 2.9× improvements respectively over the original specification. Output current capability increases to 140 mA per channel, supporting higher load driving requirements. Extended operating temperature range (-40°C to 125°C) accommodates industrial and automotive applications. These parts are RoHS3 compliant and active products. Packaging options include Tube (AD8664ARZ) and Tape & Reel (AD8664ARZ-REEL7).

For Low Power Supply Current Applications:

AD8669ARZ and AD8669ARZ-REEL7 reduce supply current to 230 µA per channel, representing 84.7% reduction compared to the original 1.5 mA specification. This configuration suits battery-powered and energy-constrained applications. Trade-offs include reduced slew rate (0.3 V/µs) and lower gain bandwidth product (540 kHz). Extended operating temperature range and RoHS3 compliance are maintained. Packaging options include Tube (AD8669ARZ) and Tape & Reel (AD8669ARZ-REEL7).

For Alternative Manufacturer Sourcing:

MC33204DR2G from onsemi provides general purpose amplifier functionality with four circuits in 14-SOIC package. This part features lower minimum supply voltage (1.8 V) enabling single-cell battery operation. Maximum supply voltage limitation (12 V) requires verification against application requirements. Higher input bias current (80 nA) and input offset voltage (10 mV) represent performance trade-offs. RoHS3 compliance and active product status are confirmed. This option supports supply chain diversification strategies.

Frequently Asked Questions (FAQ)

Q: Can LMC660CMX/NOPB be used as a direct replacement for LMC660CMX?

A: Yes. LMC660CMX/NOPB maintains identical electrical specifications including slew rate (1.1 V/µs), gain bandwidth product (1.4 MHz), supply current (1.5 mA per channel), and output current (40 mA per channel). The 14-SOIC package and pin configuration are identical. The primary difference is product status transition from obsolete to active and RoHS3 compliance certification. No circuit modifications are required.

Q: What are the key differences between AD8664ARZ and AD8669ARZ?

A: Both parts are manufactured by Analog Devices in 14-SOIC packages with four circuits and rail-to-rail output. AD8664ARZ is classified as CMOS amplifier with higher performance: 3.5 V/µs slew rate, 4 MHz gain bandwidth product, and 140 mA output current per channel. AD8669ARZ is classified as general purpose amplifier with lower performance: 0.3 V/µs slew rate, 540 kHz gain bandwidth product, and 50 mA output current per channel. AD8669ARZ provides significantly lower supply current (230 µA per channel) compared to AD8664ARZ (1.25 mA per channel). Selection depends on application bandwidth and power consumption requirements.

Q: Is MC33204DR2G compatible with the original LMC660CMX supply voltage range?

A: Partial compatibility exists. MC33204DR2G supports maximum supply voltage of 12 V, which is within the original specification maximum of 15.5 V. However, the minimum supply voltage of 1.8 V differs from the original 4.75 V minimum. Applications operating at supply voltages between 4.75 V and 12 V are fully compatible. Applications requiring supply voltages above 12 V cannot use MC33204DR2G without circuit modification.

Q: What packaging options are available for substitute parts?

A: LMC660CMX/NOPB is available in Cut Tape (CT) and Digi-Reel packaging. AD8664ARZ is supplied in Tube packaging; AD8664ARZ-REEL7 is supplied in Tape & Reel (TR) format. AD8669ARZ is supplied in Tube packaging; AD8669ARZ-REEL7 is supplied in Tape & Reel (TR) format. MC33204DR2G is available in Cut Tape and Digi-Reel packaging. Selection of packaging format depends on assembly process requirements and order quantity specifications.

Q: Do all substitute parts meet RoHS3 compliance requirements?

A: LMC660CMX is RoHS non-compliant. All substitute parts including LMC660CMX/NOPB, AD8664ARZ, AD8664ARZ-REEL7, AD8669ARZ, AD8669ARZ-REEL7, and MC33204DR2G are RoHS3 compliant. This compliance status applies to new designs and production transitions requiring regulatory adherence.

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

A: LMC660CMX operates from 0°C to 70°C. LMC660CMX/NOPB maintains this range. AD8664ARZ, AD8664ARZ-REEL7, AD8669ARZ, and AD8669ARZ-REEL7 extend the range to -40°C to 125°C, supporting industrial and automotive temperature specifications. MC33204DR2G operates from -40°C to 105°C. Applications requiring operation below 0°C or above 70°C must select substitute parts with extended temperature ranges.

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

A: Yes. All substitute parts are packaged in 14-SOIC (0.154", 3.90mm Width) format, maintaining mechanical compatibility with the original LMC660CMX. Pin count, lead pitch, and body dimensions are identical across all listed alternatives, enabling direct PCB footprint compatibility.

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