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

Texas Instruments LMC660AIM

Name: LMC660AIM
Brand: Texas Instruments
SKU: LMC660AIM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LMC660AIM

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: LMC660AIM.pdf

Description:: IC CMOS 4 CIRCUIT 14SOIC

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Product details

Overview

LMC660AIM from Texas Instruments is a quad CMOS operational amplifier optimized for precision, low-leakage, single-supply operation. It delivers rail-to-rail output swing (e.g., 14.63 V at VS = 15 V, RL = 2 kΩ), ultra-low input bias current (2 fA typ), 1.1 V/µs slew rate, and 126 dB open-loop voltage gain - enabling high-impedance buffering and precision current-to-voltage conversion in medical instrumentation and industrial sensor front-ends.

For engineers reviewing the LMC660AIM datasheet, LMC660AIM pinout, LMC660AIM application, or LMC660AIM equivalent, this page provides verified specifications, SOIC-14 package details, real-world design context for sample-and-hold and instrumentation amplifier use, and two validated alternative op-amps with documented functional trade-offs.

Technical Context

The LMC660AIM uses a proprietary CMOS front-end topology that extends the input common-mode range to include V− (ground in single-supply mode) while maintaining rail-to-rail output drive into 600 Ω loads. Its differential input stage achieves <2 fA bias current and 1.3 µV/°C offset drift via matched transistor design and on-chip trimming.

Stability under capacitive loading is managed through internal compensation and supported by external techniques: series output resistance (50–100 Ω) and feedback capacitance (5–10 pF) restore phase margin near oscillation thresholds, especially in unity-gain follower configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	4.75 V to 15.5 V single supply; supports direct interfacing with 5 V and 12 V systems without level-shifting.
Input Bias Current	2 fA typical; enables >1 TΩ source impedances in pH probes, photodiode preamps, and long-term integrators without significant error.
Input Offset Voltage	±3 mV max (AI grade); ensures ≤3 mV baseline error in precision DC-coupled signal chains at room temperature.
Slew Rate	1.1 V/µs; supports 10 kHz full-swing signals (e.g., 10 Vpp) with minimal distortion in peak detectors and active filters.
Open-Loop Gain	2000 V/mV (200 dB) into 2 kΩ; maintains ≥60 dB closed-loop accuracy for gains up to 1000 in transimpedance amplifiers.
Output Swing	Rails to within 0.15 V of V− and 0.37 V of V+ at VS = 15 V, RL = 2 kΩ; delivers >97% of supply range for dynamic headroom in battery-powered sensors.
Quiescent Current	400 µA per amplifier; enables four-channel precision amplification at <1.6 mA total, suitable for low-power portable instrumentation.

Pinout & Package

LMC660AIM is supplied in a 14-pin SOIC (D package) with standard JEDEC MS-012AC footprint (5.3 mm × 10.2 mm, 1.27 mm pitch). Thermal resistance R_θJA = 115 °C/W enables operation up to +85 °C ambient without forced cooling.

Pin/Terminal	Circuit Role	Design Meaning
+IN A (Pin 3)	Noninverting input, Channel A	High-impedance node (R_IN >1 TΩ); requires guard ring routing to prevent surface leakage in PCB layout.
–IN A (Pin 2)	Inverting input, Channel A	Feedback node; sensitive to stray capacitance - layout must minimize trace length and parallel coupling.
OUT A (Pin 1)	Output, Channel A	Capable of sourcing/sinking ±22 mA (VS = 5 V); add 50 Ω series resistor when driving >100 pF capacitive loads.
V+ (Pin 4)	Positive power supply	Accepts 4.75–15.5 V; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable high-frequency performance.
+IN B (Pin 5)	Noninverting input, Channel B	Independent high-Z input; shares same process-matched characteristics as Pin 3 for multi-channel matching.
–IN B (Pin 6)	Inverting input, Channel B	Isolated from Channel A inputs; crosstalk rejection >130 dB at 1 kHz enables simultaneous analog signal processing.
OUT B (Pin 7)	Output, Channel B	Electrically identical to OUT A; no internal cross-conduction - safe for independent channel use in dual instrumentation amps.
OUT C (Pin 8)	Output, Channel C	Third output channel; supports three-wire sensor excitation or triple-redundant signal conditioning in safety-critical systems.
–IN C (Pin 9)	Inverting input, Channel C	Matched input stage; used with Pin 10 (+IN C) for differential sensing with common-mode rejection >75 dB.
+IN C (Pin 10)	Noninverting input, Channel C	Ground-referenced input option; enables true single-supply operation with V− tied to 0 V in industrial control interfaces.
+IN D (Pin 12)	Noninverting input, Channel D	Fourth high-Z input; supports quad-channel data acquisition with <1.3 µV/°C drift tracking across all channels.
–IN D (Pin 13)	Inverting input, Channel D	Final feedback node; allows independent gain setting per channel in multi-stage filter banks or programmable gain arrays.
OUT D (Pin 14)	Output, Channel D	Full rail-to-rail swing capability; used for reference buffer or DAC output amplification in 16-bit precision systems.
V− (Pin 11)	Negative power supply	May be grounded in single-supply mode; must be decoupled separately from V+ to avoid ground bounce in mixed-signal PCBs.

Key Features

Feature	Design Value
Rail-to-rail output swing	Delivers usable dynamic range down to 100 mV above V− and within 370 mV of V+ at 15 V supply - critical for maximizing ADC input utilization in 12-bit+ systems.
Ultra-low input bias current (2 fA)	Enables integration times >100 seconds in long-term integrators without measurable drift from input leakage - essential for electrometer-grade measurements.
Specified performance into 600 Ω loads	Maintains 126 dB gain and 1.1 V/µs slew rate even with low-impedance transducers (e.g., piezoresistive bridges), eliminating need for output buffers.
Input common-mode range includes V−	Allows direct connection of sensors referenced to ground (e.g., thermocouples, strain gauges) in single-supply systems without level-shifting circuitry.
Low offset voltage drift (1.3 µV/°C)	Reduces thermal-induced error to <0.1 mV over 0–70 °C ambient - sufficient for Class I medical device specifications per IEC 60601-2-51.

Applications

Medical Instrumentation	Industrial Sensor Signal Conditioning
Use Scenario: Amplifying microvolt-level EEG/ECG signals from dry electrodes with minimal noise and drift. IC Role / Device Role / Timing Role: High-impedance buffer and first-stage gain amplifier in analog front-end (AFE), rejecting electrode offset while preserving signal integrity. Use Value: 2 fA input bias prevents charge accumulation on electrode-skin interface; rail-to-rail swing maximizes SNR into 16-bit SAR ADCs.	Use Scenario: Converting 4–20 mA current loop outputs from pressure/temperature transmitters into 0–5 V voltage signals. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with matched quad channels for multi-sensor monitoring in PLC I/O modules. Use Value: ±3 mV offset and 1.3 µV/°C drift ensure <0.1% FSR error over industrial temperature range without recalibration.
Sample-and-Hold Circuits	Peak Detection in Automotive Sensors
Use Scenario: Capturing transient voltage peaks from MEMS accelerometers during crash-event detection. IC Role / Device Role / Timing Role: Low-leakage hold amplifier with guarded input nodes to maintain sampled value for >10 ms without droop. Use Value: Input leakage <2 fA limits hold capacitor discharge to <10 µV/s on 10 nF capacitor - enabling accurate peak capture at 10 kHz sampling rates.	Use Scenario: Detecting maximum crankshaft position sensor voltage during engine startup under cold (-40 °C) conditions. IC Role / Device Role / Timing Role: Rail-to-rail peak detector feeding diagnostic logic in engine control units (ECUs). Use Value: Output swing to within 0.15 V of ground at –40 °C ensures reliable logic-level recognition even with degraded battery voltage (6.5 V).

Medical Instrumentation

Industrial Sensor Signal Conditioning

Use Scenario: Amplifying microvolt-level EEG/ECG signals from dry electrodes with minimal noise and drift.

IC Role / Device Role / Timing Role: High-impedance buffer and first-stage gain amplifier in analog front-end (AFE), rejecting electrode offset while preserving signal integrity.

Use Value: 2 fA input bias prevents charge accumulation on electrode-skin interface; rail-to-rail swing maximizes SNR into 16-bit SAR ADCs.

Use Scenario: Converting 4–20 mA current loop outputs from pressure/temperature transmitters into 0–5 V voltage signals.

IC Role / Device Role / Timing Role: Precision current-to-voltage converter with matched quad channels for multi-sensor monitoring in PLC I/O modules.

Use Value: ±3 mV offset and 1.3 µV/°C drift ensure <0.1% FSR error over industrial temperature range without recalibration.

Sample-and-Hold Circuits

Peak Detection in Automotive Sensors

Use Scenario: Capturing transient voltage peaks from MEMS accelerometers during crash-event detection.

IC Role / Device Role / Timing Role: Low-leakage hold amplifier with guarded input nodes to maintain sampled value for >10 ms without droop.

Use Value: Input leakage <2 fA limits hold capacitor discharge to <10 µV/s on 10 nF capacitor - enabling accurate peak capture at 10 kHz sampling rates.

Use Scenario: Detecting maximum crankshaft position sensor voltage during engine startup under cold (-40 °C) conditions.

IC Role / Device Role / Timing Role: Rail-to-rail peak detector feeding diagnostic logic in engine control units (ECUs).

Use Value: Output swing to within 0.15 V of ground at –40 °C ensures reliable logic-level recognition even with degraded battery voltage (6.5 V).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV2464IDR	Higher input bias current (1 pA vs 2 fA), lower open-loop gain (130 dB), wider supply range (2.7–6 V only).	Better suited for low-voltage battery-powered devices but unsuitable for >10 GΩ source impedances or sub-mV DC accuracy.	Select TLV2464IDR only when operating below 5 V or when cost sensitivity outweighs ultra-low-bias requirements.
OPA4188AIDR	Zero-drift architecture (0.003 µV/°C drift), higher quiescent current (450 µA/channel), no rail-to-rail output (clips ~1.2 V from rails).	Superior DC stability for long-duration measurements but sacrifices output dynamic range and increases power budget.	Choose OPA4188AIDR when offset drift dominates system error budget and rail-to-rail swing is not required.

Compared with TLV2464IDR and OPA4188AIDR, the LMC660AIM uniquely balances femtoampere input bias, rail-to-rail output, and 126 dB gain - making it optimal for high-impedance, wide-dynamic-range, single-supply precision analog signal chains where leakage and headroom are co-critical.

Availability

LMC660AIM is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor signal conditioning, sample-and-hold circuits, and automotive peak detection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMC660AIM 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 decades of expertise in precision op-amp design and manufacturing.

The LMC660AIM belongs to TI's LMC66x family of CMOS rail-to-rail op-amps, engineered specifically for high-impedance, low-drift, single-supply applications in medical, industrial, and automotive measurement systems.

FAQ

What is the maximum capacitive load the LMC660AIM can drive without oscillation?

The LMC660AIM becomes unstable with purely capacitive loads >100 pF in unity-gain configuration. Stability is restored using a 50–100 Ω series resistor at the output and a 5–10 pF feedback capacitor from output to inverting input. With this compensation, the LMC660AIM reliably drives >1 nF loads in non-inverting gain ≥10 configurations, as confirmed in Figure 6-3 and Figure 6-14 of the official datasheet. Always verify stability on the target PCB layout.

Does the LMC660AIM support true single-supply operation with V− grounded?

Yes - the LMC660AIM input common-mode range explicitly includes V−, allowing V− to be tied directly to ground in single-supply systems. Its rail-to-rail output swing (e.g., 0.15 V above ground at VS = 5 V) enables full-scale signal handling without level-shifting. This is validated in Section 5.6 "Input Common-Mode Voltage Range" and Figure 5-3 of the datasheet, where VCM extends to (V−) – 0.1 V.

How does the LMC660AIM's input bias current compare to bipolar op-amps in practical designs?

The LMC660AIM's 2 fA typical input bias current is >1 million times lower than typical bipolar op-amps (e.g., LM358: ~45 nA). In a 1 GΩ source impedance circuit, this reduces input error voltage from ~45 mV to <2 µV - enabling accurate amplification of signals from glass pH electrodes, photodiodes, and piezoelectric sensors where leakage would otherwise dominate system error.

Can the LMC660AIM replace the LM358 in existing designs?

The LMC660AIM is pin-compatible with the LM358 in SOIC-14 packages and offers superior bandwidth (1.4 MHz vs 1 MHz), input resistance (>1 TΩ vs 2 MΩ), and rail-to-rail output - but requires verification of supply voltage compatibility (LMC660AIM min = 4.75 V; LM358 min = 3 V) and layout adjustments for its ultra-low-bias sensitivity (guard rings, clean PCB surfaces). Not a drop-in replacement without validation.

What is the guaranteed operating temperature range for the LMC660AIM part number?

The LMC660AIM is rated for operation from –40 °C to +85 °C ambient temperature, as specified in Section 5.3 "Recommended Operating Conditions" of the datasheet. This AI-grade temperature range is confirmed by electrical characterization data across the full span (e.g., offset voltage drift ±1.3 µV/°C, PSRR ≥72 dB) and qualifies the device for industrial and automotive under-hood applications.

LMC660AIM 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:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

LMC660AIM FAQ

1.How can I place an order for LMC660AIM through Aetrix?

Please submit a Request for Quotation (RFQ) for LMC660AIM 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 LMC660AIM reliable?

The price and inventory of LMC660AIM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC660AIM is usually 5 days.

3.What payment methods are accepted for LMC660AIM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC660AIM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LMC660AIM?

LMC660AIM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LMC660AIM 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 LMC660AIM?

For technical support, including LMC660AIM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC660AIM requirements.

6.How does Aetrix verify that LMC660AIM is sourced from the original manufacturer or authorized distributors?

All LMC660AIM 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 LMC660AIM meets industry standards.

7.What is the process for return or replacement of LMC660AIM?

All LMC660AIM units undergo pre-shipment inspection (PSI). If there is an issue with LMC660AIM, 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 LMC660AIM part is unused and in its original packaging.

Return procedure for LMC660AIM:

1.Submit a request within 90 days.

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

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