LMC660CN/NOPB Equivalent & Substitute Parts

Part Overview

The LMC660CN/NOPB is a CMOS operational amplifier integrated circuit manufactured by Texas Instruments, featuring four independent amplifier circuits in a 14-pin DIP package. This device is classified as a CMOS amplifier with push-pull, rail-to-rail output capability, designed for general-purpose analog signal processing applications. The LMC660CN/NOPB is currently designated as Last Time Buy, indicating that the original manufacturer has discontinued or will discontinue production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Key Parameters

Parameter	Value	Unit
Amplifier Type	CMOS	—
Number of Circuits	4	—
Output Type	Push-Pull, Rail-to-Rail	—
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 (x4 Channels)	1.5	mA
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	Through Hole	—
Package / Case	14-DIP (0.300", 7.62mm)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LMC660CN/NOPB is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Number of circuits (4 independent amplifiers required)
Output type (rail-to-rail capability)
Supply voltage range (minimum 4.75 V, maximum 15.5 V)
Operating temperature range (0°C to 70°C minimum)
Current output per channel (40 mA minimum)

Mechanical Compatibility Criteria:

Mounting type (through-hole required for direct PCB replacement)
Package type (14-DIP form factor)

Compliance Criteria:

RoHS3 compliance
REACH unaffected status

The substitute parts identified below satisfy these criteria with identical or superior electrical performance characteristics while maintaining mechanical compatibility with the original LMC660CN/NOPB footprint.

Parameter Comparison

Parameter	LMC660CN/NOPB	LMC660CMX/NOPB	TLC2274ACN	TLC2274AIN
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	CMOS	CMOS	General Purpose	General Purpose
Number of Circuits	4	4	4	4
Output Type	Push-Pull, Rail-to-Rail	Push-Pull, Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	1.1	1.1	3.6	3.6
Gain Bandwidth Product (MHz)	1.4	1.4	2.25	2.25
Current - Input Bias (pA)	0.002	0.002	1	1
Voltage - Input Offset (mV)	1	1	0.3	0.3
Current - Supply x4 Channels (mA)	1.5	1.5	4.8	4.8
Current - Output / Channel (mA)	40	40	50	50
Voltage - Supply Span Min (V)	4.75	4.75	4.4	4.4
Voltage - Supply Span Max (V)	15.5	15.5	16	16
Operating Temperature (°C)	0 to 70	0 to 70	0 to 70	-40 to 125
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole
Package / Case	14-DIP	14-SOIC	14-DIP	14-DIP
Product Status	Last Time Buy	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Through-Hole Replacement (Identical Package):

TLC2274ACN and TLC2274AIN are the primary substitutes for direct PCB replacement of the LMC660CN/NOPB. Both devices maintain the 14-DIP through-hole package format, ensuring mechanical compatibility without PCB redesign. Both parts are manufactured by Texas Instruments and carry active product status, ensuring long-term availability and supply chain stability. Both are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original part.

The TLC2274ACN operates within the identical temperature range (0°C to 70°C) as the LMC660CN/NOPB, making it the most direct functional equivalent. The TLC2274AIN extends the operating temperature range to -40°C to 125°C, providing enhanced thermal performance for applications requiring extended temperature operation.

Surface Mount Alternative:

The LMC660CMX/NOPB is a surface-mount variant of the LMC660 base product, maintaining identical electrical specifications to the LMC660CN/NOPB while utilizing a 14-SOIC package. This part is suitable only for applications where PCB redesign to accommodate surface-mount technology is feasible. The LMC660CMX/NOPB carries active product status and offers significantly higher inventory availability (17,800 units in stock).

Electrical Performance Considerations:

The TLC2274 series (both ACN and AIN variants) demonstrates superior electrical performance compared to the LMC660CN/NOPB across multiple parameters: slew rate is 3.27 times higher (3.6 V/µs versus 1.1 V/µs), gain bandwidth product is 1.61 times higher (2.25 MHz versus 1.4 MHz), and output current per channel is 25% higher (50 mA versus 40 mA). These improvements ensure that the TLC2274 series can directly replace the LMC660CN/NOPB in existing circuit designs without performance degradation.

Frequently Asked Questions (FAQ)

Q: Can the LMC660CMX/NOPB be used as a direct replacement for the LMC660CN/NOPB?

A: The LMC660CMX/NOPB is electrically identical to the LMC660CN/NOPB but uses a different package format (14-SOIC surface mount versus 14-DIP through hole). Direct PCB replacement is not possible without redesigning the circuit board layout and modifying the assembly process. The LMC660CMX/NOPB is suitable only when PCB redesign is acceptable.

Q: What is the primary difference between TLC2274ACN and TLC2274AIN?

A: Both devices are functionally identical with respect to electrical performance and package format (14-DIP through hole). The primary difference is operating temperature range: TLC2274ACN operates from 0°C to 70°C, while TLC2274AIN operates from -40°C to 125°C. Select TLC2274AIN for applications requiring extended temperature operation beyond the standard commercial range.

Q: Are the TLC2274 series parts compatible with existing LMC660CN/NOPB circuit designs?

A: Yes. The TLC2274ACN and TLC2274AIN maintain the same 14-DIP package footprint and pin configuration as the LMC660CN/NOPB. Both devices provide superior electrical performance (higher slew rate, higher gain bandwidth product, higher output current) and are therefore functionally compatible with existing designs. No circuit modifications are required.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts (LMC660CMX/NOPB, TLC2274ACN, and TLC2274AIN) are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original LMC660CN/NOPB.

Q: Which substitute part offers the best long-term availability?

A: The LMC660CMX/NOPB currently has the highest inventory level (17,800 units in stock) and carries active product status. However, if through-hole mounting is required, both TLC2274ACN (1,900 units) and TLC2274AIN (2,000 units) are active products with stable supply status.

Q: Can I use the TLC2274 series in applications with supply voltages below 4.4 V?

A: No. The TLC2274 series minimum supply voltage is 4.4 V, which is lower than the LMC660CN/NOPB minimum of 4.75 V. However, both devices support the same maximum supply voltage of 15.5 V to 16 V. Verify that your application supply voltage meets the minimum 4.4 V requirement before selecting the TLC2274 series.

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