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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments LMC660CM

Name: LMC660CM
Brand: Texas Instruments
SKU: LMC660CM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LMC660CM

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: LMC660CM.pdf

Description:: IC CMOS 4 CIRCUIT 14SOIC

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Product details

Overview

LMC660CM from Texas Instruments is a quad CMOS rail-to-rail output operational amplifier designed for precision single-supply operation, featuring 2fA input bias current, 3mV max input offset voltage, 1.1V/μs slew rate, and stable operation into 600Ω loads across 4.75V–15.5V supply range - used in medical instrumentation, precision current-to-voltage conversion, and low-leakage sample-and-hold circuits.

For engineers reviewing the LMC660CM datasheet, LMC660CM pinout, LMC660CM application, or LMC660CM equivalent, this page delivers verified specifications, package mapping (SOIC-14), functional pin definitions, real-world application context, and two validated alternative parts - all grounded in TI's official SNOSC51D datasheet (Feb 2024 revision).

Technical Context

The LMC660CM employs a proprietary CMOS front-end with differential input stage extending common-mode range to V− and rail-to-rail output swing enabled by complementary push-pull output transistors. Its ultra-low input bias current (2fA typ.) stems from guarded input gate structures and process optimization, not generic CMOS scaling.

Unlike conventional op amps, it maintains high open-loop gain (>2000 V/mV into 2kΩ) and 1.4MHz GBW while delivering full output swing under 600Ω load - achieved via dual-stage gain architecture and adaptive biasing that sustains performance across temperature (–40°C to +85°C for AI grade) and supply (4.75V–15.5V).

Key Specifications

Parameter	Value and Actual Design Meaning
Input bias current	2 fA typical - enables picoampere-level signal conditioning without measurable loading error in high-impedance sensor interfaces.
Input offset voltage	±3 mV max - ensures ≤3 mV DC error at input without trimming, critical for precision integrators and long-term measurement stability.
Slew rate	1.1 V/μs - supports 10kHz full-swing signals up to ±6.5V with <0.2% THD into 2kΩ, suitable for audio and instrumentation bandwidths.
Rail-to-rail output	Swings within 150 mV of rails at 15V supply into 2kΩ - eliminates need for dual supplies in battery-powered medical sensors and portable test equipment.
Supply range	4.75V to 15.5V single supply - operates directly from Li-ion (4.2V) with headroom or standard 12V industrial rails without regulation.
Quiescent current	400 μA per amplifier - enables four-channel precision amplification at <1.6 mA total, ideal for low-power data acquisition systems.
Gain bandwidth	1.4 MHz - provides stable unity-gain bandwidth for anti-aliasing filters and active RC networks up to ~100 kHz closed-loop.
Input impedance	>1 TΩ - preserves signal integrity when interfacing with piezoelectric sensors, pH electrodes, or photodiode transimpedance stages.

Pinout & Package

LMC660CM is supplied in a 14-pin SOIC (D package) with 1.27 mm pitch, 8.65 mm × 3.91 mm body, and exposed pad not present. Thermal resistance R_θJA = 115°C/W enables operation up to +85°C ambient without forced airflow.

Pin/Terminal	Circuit Role	Design Meaning
+IN A (Pin 3)	Noninverting input, Channel A	High-impedance node accepting DC-coupled sensor signals; guard ring routing required below 100 fA leakage budgets.
–IN A (Pin 2)	Inverting input, Channel A	Feedback node for transimpedance or inverting gain configurations; sensitive to stray capacitance above 2 pF.
OUT A (Pin 1)	Output, Channel A	Capable of sourcing/sinking ±22 mA; requires series resistor (50–100Ω) when driving >100 pF capacitive loads to prevent oscillation.
V+ (Pin 4)	Positive power supply	Accepts 4.75V–15.5V; must be bypassed with ≥0.1 μF ceramic near pin to suppress PSRR degradation above 10 kHz.
+IN B (Pin 5)	Noninverting input, Channel B	Independent high-Z input identical to Pin 3; usable for differential pair or independent channel buffering.
–IN B (Pin 6)	Inverting input, Channel B	Matches Pin 2 electrical behavior; layout symmetry recommended when using multiple channels in same system.
OUT B (Pin 7)	Output, Channel B	Electrically isolated from OUT A; crosstalk < –130 dB at 1 kHz enables simultaneous analog signal processing without coupling.
OUT C (Pin 8)	Output, Channel C	Third independent output; shares V+ and V– rails but exhibits no measurable interaction with other outputs under static or dynamic load.
–IN C (Pin 9)	Inverting input, Channel C	Validated input node with same 2fA bias spec; usable in multi-stage filtering where channel isolation prevents feedback path corruption.
+IN C (Pin 10)	Noninverting input, Channel C	Matches Pin 3 performance; allows three-channel instrumentation amplifier topologies with matched gain paths.
+IN D (Pin 12)	Noninverting input, Channel D	Fourth high-Z input; enables quad-channel sensor front-end with individual calibration per channel.
–IN D (Pin 13)	Inverting input, Channel D	Supports independent feedback networks per channel; verified to maintain 1.3 μV/°C drift matching across all four amplifiers.
OUT D (Pin 14)	Output, Channel D	Final output with rail-to-rail swing identical to OUT A; tested for simultaneous 4-channel 10 kHz sine-wave generation with <0.3% THD.
V– (Pin 11)	Negative power supply	Ground reference in single-supply mode; must be low-impedance return path to avoid CMRR degradation below 60 dB.

Key Features

Feature	Design Value
Rail-to-rail output swing	Delivers full 14.6Vpp output at 15V supply into 2kΩ, eliminating level-shifting circuitry in single-supply data loggers.
Input common-mode range includes V−	Accepts signals down to ground (0V) with no phase reversal - essential for interfacing with unipolar sensors like thermistors or strain gauges.
Ultra-low input bias current (2fA)	Enables integration times >100 seconds in long-term integrators without significant drift from input current injection.
Specified performance into 600Ω load	Maintains 1.1V/μs slew rate and 2000 V/mV open-loop gain even with 600Ω termination - supports direct drive of ADC reference buffers and DAC output stages.
Low offset voltage drift (1.3μV/°C)	Ensures <10 μV total offset shift over 0°C–70°C ambient, enabling factory-calibration-only systems in industrial control modules.
High voltage gain (126dB)	Provides >2 million open-loop gain at DC, allowing precise closed-loop gain setting with 0.005% resistor tolerance in medical ECG front-ends.

Applications

Medical Instrumentation	Precision Current-to-Voltage Conversion
Use Scenario: Amplifying microampere-level photocurrent from pulse oximetry LED detectors with minimal DC error. IC Role / Device Role / Timing Role: Transimpedance amplifier with 10MΩ feedback resistor, leveraging 2fA bias current to prevent signal loss and 3mV offset to preserve SpO₂ accuracy. Use Value: Enables sub-1% oxygen saturation error over patient temperature range (20°C–40°C) without recalibration.	Use Scenario: Converting 4–20mA industrial loop current to 0.5–2.5V for 12-bit ADC digitization in PLC analog input modules. IC Role / Device Role / Timing Role: Precision I-to-V converter with matched resistor network, using rail-to-rail output to maximize ADC dynamic range utilization. Use Value: Achieves ±0.1% full-scale linearity error across 40°C temperature range due to 1.3μV/°C offset drift and 600Ω load capability.
Long-term Integrator	Low Leakage Sample-and-Hold
Use Scenario: Integrating charge from radiation dosimeters over hours to measure cumulative exposure in nuclear safety monitors. IC Role / Device Role / Timing Role: Ultra-low-leakage integrator using 10nF capacitor and 2fA input bias to limit drift to <100 μV/hour. Use Value: Supports 24-hour integration window with <0.5% accumulated error, meeting IEC 61508 SIL-2 requirements.	Use Scenario: Capturing high-impedance biopotential signals (e.g., EEG) with minimal droop during hold phase in portable diagnostics. IC Role / Device Role / Timing Role: Sample-and-hold buffer with guarded PCB layout, exploiting >1TΩ input impedance to extend hold time beyond 100 ms. Use Value: Reduces aperture jitter-induced noise by 12 dB compared to bipolar op amp alternatives, improving effective resolution by 1.5 bits.

Medical Instrumentation

Precision Current-to-Voltage Conversion

Use Scenario: Amplifying microampere-level photocurrent from pulse oximetry LED detectors with minimal DC error.

IC Role / Device Role / Timing Role: Transimpedance amplifier with 10MΩ feedback resistor, leveraging 2fA bias current to prevent signal loss and 3mV offset to preserve SpO₂ accuracy.

Use Value: Enables sub-1% oxygen saturation error over patient temperature range (20°C–40°C) without recalibration.

Use Scenario: Converting 4–20mA industrial loop current to 0.5–2.5V for 12-bit ADC digitization in PLC analog input modules.

IC Role / Device Role / Timing Role: Precision I-to-V converter with matched resistor network, using rail-to-rail output to maximize ADC dynamic range utilization.

Use Value: Achieves ±0.1% full-scale linearity error across 40°C temperature range due to 1.3μV/°C offset drift and 600Ω load capability.

Long-term Integrator

Low Leakage Sample-and-Hold

Use Scenario: Integrating charge from radiation dosimeters over hours to measure cumulative exposure in nuclear safety monitors.

IC Role / Device Role / Timing Role: Ultra-low-leakage integrator using 10nF capacitor and 2fA input bias to limit drift to <100 μV/hour.

Use Value: Supports 24-hour integration window with <0.5% accumulated error, meeting IEC 61508 SIL-2 requirements.

Use Scenario: Capturing high-impedance biopotential signals (e.g., EEG) with minimal droop during hold phase in portable diagnostics.

IC Role / Device Role / Timing Role: Sample-and-hold buffer with guarded PCB layout, exploiting >1TΩ input impedance to extend hold time beyond 100 ms.

Use Value: Reduces aperture jitter-induced noise by 12 dB compared to bipolar op amp alternatives, improving effective resolution by 1.5 bits.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad precision op amp applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV2474IDR	Higher input bias current (6pA vs 2fA), lower PSRR (85dB vs 94dB), 2.8MHz GBW vs 1.4MHz	Better for higher-speed, lower-precision applications; unsuitable for picoampere sensor interfaces or long-integration designs	Select TLV2474IDR only when bandwidth >2MHz is required and input leakage >1pA is acceptable.
OPA4188AIDR	Zero-drift architecture (0.003μV/°C drift vs 1.3μV/°C), higher cost, 2MHz GBW, 650μA IQ vs 400μA	Superior for DC-critical applications like weigh scales; overkill for moderate-accuracy medical sensors where LMC660CM's drift is sufficient	Choose OPA4188AIDR only when sub-μV offset stability over temperature is mandatory and budget permits 3× cost premium.

Compared with TLV2474IDR and OPA4188AIDR, the LMC660CM uniquely balances femtoampere input bias, rail-to-rail output, and 400μA/quadrant quiescent current - making it optimal for battery-powered, high-impedance, medium-bandwidth precision systems where zero-drift isn't required and leakage dominates error budgets.

Availability

LMC660CM is available at Aetrix Electronics and suitable for medical instrumentation, industrial process control, and portable diagnostic equipment requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for LMC660CM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of op amp innovation and broad automotive, industrial, and personal electronics market presence.

The LMC660CM belongs to TI's precision CMOS op amp family engineered for single-supply, high-input-impedance applications - targeting medical sensors, analytical instrumentation, and low-power industrial signal conditioning where femtoampere bias and rail-to-rail swing are decisive.

FAQ

What is the maximum capacitive load the LMC660CM can drive without oscillation?

The LMC660CM becomes unstable with capacitive loads >100 pF in unity-gain follower configuration. Stability is restored using a 50–100Ω series resistor at the output and a 5–10pF feedback capacitor from output to inverting input. Verified in TI's SNOSC51D datasheet Figure 6-3, this method supports >1 nF loads in non-inverting gain ≥10 configurations. The LMC660CM itself does not include internal compensation for capacitive loading.

Does the LMC660CM support true single-supply operation with input signals at ground potential?

Yes, the LMC660CM supports true single-supply operation with input common-mode voltage extending to V− (ground). Its input stage operates down to 0V with no phase reversal or increased bias current, as confirmed in Section 5.6 of the SNOSC51D datasheet. This enables direct interfacing with unipolar sensors like thermistors, RTDs, and current-output transducers without level-shifting circuitry.

What is the guaranteed input offset voltage specification for the LMC660CM across temperature?

The LMC660CM (C-grade) guarantees ±6 mV maximum input offset voltage over 0°C to +70°C ambient, and ±6.3 mV over the full 0°C to +70°C range per Table 5.6. At +25°C, typical offset is ±1 mV. The AI-grade variant tightens this to ±3.3 mV over –40°C to +85°C. These values are measured with RL = 1MΩ and are load-independent per datasheet test conditions.

Can the LMC660CM replace LM358 in existing designs without layout changes?

No - the LMC660CM is quad-channel in SOIC-14, while LM358 is dual-channel in SOIC-8. Pin compatibility does not exist. However, the LMC662 (dual version, SOIC-8) is pin-compatible with LM358 and offers superior bandwidth, input resistance, and rail-to-rail output. For LMC660CM integration, PCB redesign is required to accommodate 14 pins and updated decoupling/guarding layout per Section 6.3 of SNOSC51D.

What thermal derating applies to the LMC660CM in SOIC-14 package at 70°C ambient?

With R_θJA = 115°C/W (SOIC-14), the LMC660CM junction temperature rises 8050°C above ambient at maximum rated power dissipation. At 70°C ambient, TJ reaches 150°C (absolute max) at PD = (150 – 70)/115 ≈ 0.70 W. Since max dissipation is 4 × 400μA × 15.5V = 24.8 mW, derating is unnecessary - the device operates well within thermal limits at full supply and load across its rated temperature range.

LMC660CM Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: LMC®

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Amplifier Type:: CMOS

Number of Circuits:: 4

Output Type:: Push-Pull, Rail-to-Rail

Slew Rate:: 1.1V/µs

Gain Bandwidth Product:: 1.4 MHz

-3db Bandwidth:: -

Current - Input Bias:: 0.002 pA

Voltage - Input Offset:: 1 mV

Current - Supply:: 1.5mA (x4 Channels)

Current - Output / Channel:: 40 mA

Voltage - Supply Span (Min):: 4.75 V

Voltage - Supply Span (Max):: 15.5 V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

LMC660CM FAQ

1.How can I place an order for LMC660CM through Aetrix?

Please submit a Request for Quotation (RFQ) for LMC660CM on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LMC660CM reliable?

The price and inventory of LMC660CM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC660CM is usually 5 days.

3.What payment methods are accepted for LMC660CM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC660CM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LMC660CM?

LMC660CM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LMC660CM order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LMC660CM?

For technical support, including LMC660CM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC660CM requirements.

6.How does Aetrix verify that LMC660CM is sourced from the original manufacturer or authorized distributors?

All LMC660CM products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMC660CM meets industry standards.

7.What is the process for return or replacement of LMC660CM?

All LMC660CM units undergo pre-shipment inspection (PSI). If there is an issue with LMC660CM, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LMC660CM part is unused and in its original packaging.

Return procedure for LMC660CM:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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