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Texas Instruments LMC660CMX
- Part No.:
- LMC660CMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC660CMX.pdf
- Description:
- IC CMOS 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,488
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Product details
Overview
LMC660CMX from Texas Instruments is a quad CMOS operational amplifier optimized for precision single-supply operation, featuring rail-to-rail output swing (±0.15V from rails at 5V/2kΩ), ultra-low input bias current (2fA typ), 1.1V/μs slew rate, and 1.4MHz gain-bandwidth product - enabling high-impedance sensor buffering and low-leakage sample-and-hold circuits in medical instrumentation and industrial controls.
For engineers reviewing the LMC660CMX datasheet, LMC660CMX pinout, LMC660CMX application, or LMC660CMX equivalent, this page delivers verified specifications, SOIC-14 package mapping, real-world design context for rail-to-rail output driving 600Ω loads, and validated alternative options for precision amplifier selection.
Technical Context
The LMC660CMX employs a proprietary CMOS front-end topology with differential input stage extending common-mode range to V− (ground in single-supply mode) and rail-to-rail output stage using complementary push-pull drivers. Its open-loop gain exceeds 126dB into 2kΩ loads and maintains ≥100V/mV even under 600Ω loading at 15V supply.
Designed for stability with capacitive loads up to 100pF when compensated with series output resistor (50–100Ω) and feedback capacitor (5–10pF), the device supports unity-gain configurations while delivering 130dB channel-to-channel crosstalk and 50° phase margin across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.75V to 15.5V single supply; enables direct interfacing with 5V/12V systems without level-shifting |
| Input Bias Current | 2fA typical; allows use with >1GΩ source impedances without significant DC error |
| Rail-to-Rail Output | Swings within 0.15V of V− and 0.37V of V+ at 5V/2kΩ; supports full dynamic range in single-supply data acquisition |
| Gain-Bandwidth Product | 1.4MHz; sufficient for precision filtering (e.g., 10Hz band-pass) and low-frequency signal conditioning |
| Slew Rate | 1.1V/μs; handles 10V step responses in <10μs for fast settling in sample-and-hold applications |
| Input Offset Drift | 1.3μV/°C max; ensures <10μV total drift over 0°C to 70°C operating range |
| Quiescent Current | 375–675μA per amplifier; enables low-power multi-channel designs with predictable thermal dissipation |
Pinout & Package
LMC660CMX is supplied in a 14-pin SOIC (D package) with standard JEDEC outline and 1.27mm pitch. Thermal resistance θJA is 115°C/W, supporting operation up to +70°C ambient without forced cooling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | High-impedance node (≥1TΩ) accepting signals down to V−; guard ring required for sub-pA leakage control |
| –IN A (Pin 2) | Inverting input, Channel A | Feedback node requiring low-stray-capacitance layout; sensitive to PCB trace capacitance above 10pF |
| OUT A (Pin 1) | Output, Channel A | Capable of sourcing/sinking ±22mA (5V) or ±40mA (15V); requires series resistor for >100pF capacitive loads |
| V+ (Pin 4) | Positive power supply | Maximum 15.5V; must not exceed 13V when output shorted to avoid reliability degradation |
| V– (Pin 11) | Negative power supply | Ground reference in single-supply mode; input common-mode range extends to this rail |
| +IN B (Pin 5) | Noninverting input, Channel B | Electrically identical to Pin 3; independent channel for dual-sensor interfaces |
| –IN B (Pin 6) | Inverting input, Channel B | Isolated from Channel A inputs; crosstalk ≤ –130dB at 1kHz |
| OUT B (Pin 7) | Output, Channel B | Matched performance to OUT A; supports independent load driving without interaction |
| +IN C (Pin 10) | Noninverting input, Channel C | Third high-Z input; usable for multi-channel transducer signal conditioning |
| –IN C (Pin 9) | Inverting input, Channel C | Supports individual feedback networks per channel; no shared internal nodes |
| OUT C (Pin 8) | Output, Channel C | Delivers same rail-to-rail swing and drive strength as other outputs |
| +IN D (Pin 12) | Noninverting input, Channel D | Fourth independent input; enables 4-channel simultaneous sampling |
| –IN D (Pin 13) | Inverting input, Channel D | Full isolation from other channels; specified CMRR ≥66dB over 0°C–70°C |
| OUT D (Pin 14) | Output, Channel D | Final output with identical AC/DC specs; supports quad instrumentation amplifier topologies |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Enables full-scale signal utilization in 5V microcontroller ADC interfaces without negative supply |
| Ultra-low input bias current (2fA) | Permits direct connection to piezoelectric sensors, pH electrodes, and photodiode transimpedance stages |
| Specified performance into 600Ω loads | Guarantees stable operation driving analog switches, LED drivers, or low-impedance DAC buffers |
| Input common-mode range includes V− | Eliminates need for level-shifting circuitry when interfacing with ground-referenced transducers |
| Low offset voltage drift (1.3μV/°C) | Reduces calibration frequency in portable test equipment operating across environmental temperatures |
Applications
| Medical Instrumentation | Industrial Sensor Interface |
|---|---|
Use Scenario: Amplifying weak bio-potential signals from ECG electrodes with minimal DC drift and leakage-induced baseline wander. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and gain stage in front-end analog signal chain. Use Value: 2fA input bias current prevents electrode polarization errors; rail-to-rail output maximizes ADC dynamic range in battery-powered devices. | Use Scenario: Conditioning output from high-impedance RTD or thermistor bridges in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Low-drift, high-Z instrumentation amplifier front-end with matched quad topology. Use Value: 1.3μV/°C offset drift ensures <±10μV error over industrial temperature range; 1.4MHz GBW supports anti-alias filtering at 10Hz. |
| Automotive Sensor Signal Chain | Precision Sample-and-Hold |
Use Scenario: Signal conditioning for MEMS pressure sensors in engine control units where supply rails vary between 5V and 12V. IC Role / Device Role / Timing Role: Rail-to-rail input/output op amp operating from unregulated vehicle battery supply. Use Value: 4.75–15.5V supply range accommodates cold-crank (5V) to alternator-overvoltage (15.5V); PSRR >75dB rejects supply noise. | Use Scenario: Holding analog voltage from a multiplexed sensor array during ADC conversion cycles in data loggers. IC Role / Device Role / Timing Role: Ultra-low-leakage hold amplifier with guarded input structure. Use Value: 2fA bias current limits droop to <1mV/s on 1nF hold capacitor; SOIC-14 layout supports guard ring implementation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMC662CMX | Dual-channel version in SOIC-8; identical electrical specs but half channel count and lower quiescent current (375–650μA per amp) | Better suited for space-constrained dual-signal paths; lacks two channels needed for 4-sensor systems | Select LMC662CMX when board area or power budget favors dual configuration over quad integration |
| OPA2333AIDR | Zero-drift architecture; 0.02μV/°C offset drift vs 1.3μV/°C; higher 350kHz GBW but 120pA input bias current | Superior DC accuracy for long-term integrators; unsuitable for pA-level current measurement due to 60,000× higher bias current | Choose OPA2333AIDR only when ultra-low drift dominates over input leakage requirements |
Compared with LMC660CMX, LMC662CMX reduces channel count and package size while preserving all key precision parameters, whereas OPA2333AIDR trades ultra-low bias current for near-zero offset drift - making LMC660CMX uniquely suitable for high-impedance, moderate-bandwidth applications where leakage is the dominant error source.
Availability
LMC660CMX is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor interface, automotive sensor signal chain, and precision sample-and-hold applications requiring stable component supply across extended production lifecycles.
Supply support for LMC660CMX 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 innovation in precision amplifiers and power management ICs.
The LMC66x family was designed specifically for single-supply, high-impedance precision signal conditioning - targeting medical diagnostics, industrial process control, and automotive sensor front-ends where rail-to-rail operation and femtoampere input bias are critical.
FAQ
What is the maximum supply voltage for LMC660CMX?
The absolute maximum supply voltage for LMC660CMX is 16V, but the recommended operating range is 4.75V to 15.5V. Exceeding 13V while shorting the output to V+ may adversely affect long-term reliability, as specified in the Absolute Maximum Ratings table. Operation at 15.5V is fully characterized and supported across the full temperature range.
Does LMC660CMX support true rail-to-rail input?
LMC660CMX does not provide rail-to-rail input common-mode range - its input range extends to V− (including ground in single-supply mode) but stops 1.9V below V+ at 15V supply. However, it delivers true rail-to-rail output swing, reaching within 0.15V of V− and 0.37V of V+ under 2kΩ load conditions at 5V supply.
Can LMC660CMX drive a 600Ω load stably?
Yes, LMC660CMX is explicitly specified for 600Ω loads in its Electrical Characteristics table, with guaranteed output swing (e.g., 4.27V to 0.30V at 5V/600Ω) and open-loop gain (≥150V/mV). Stability is maintained with proper PCB layout and optional 50Ω series output resistor for capacitive loads exceeding 50pF.
What is the input bias current specification for LMC660CMX at 85°C?
At TA = –40°C to +85°C, the input bias current for LMC660CMX is specified as ±4pA maximum (not fA), reflecting increased leakage at elevated temperature. The 2fA typical value applies only at +25°C; designers must account for this 2000× increase when specifying leakage-critical applications operating at maximum junction temperature.
Is LMC660CMX pin-compatible with LM358?
No, LMC660CMX is not pin-compatible with LM358. While the dual LMC662 is pin-compatible with LM358 in SOIC-8, the quad LMC660CMX uses a 14-pin SOIC package with different pin assignments (e.g., V– on Pin 11 vs Pin 4 in LM324). Direct replacement requires PCB redesign and verification of layout-dependent leakage paths.
LMC660CMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMC®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LMC660CMX FAQ
1.How can I place an order for LMC660CMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC660CMX 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 LMC660CMX reliable?
The price and inventory of LMC660CMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC660CMX is usually 5 days.
3.What payment methods are accepted for LMC660CMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC660CMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC660CMX?
LMC660CMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC660CMX 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 LMC660CMX?
For technical support, including LMC660CMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC660CMX requirements.
6.How does Aetrix verify that LMC660CMX is sourced from the original manufacturer or authorized distributors?
All LMC660CMX 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 LMC660CMX meets industry standards.
7.What is the process for return or replacement of LMC660CMX?
All LMC660CMX units undergo pre-shipment inspection (PSI). If there is an issue with LMC660CMX, 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 LMC660CMX part is unused and in its original packaging.
Return procedure for LMC660CMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMC660CMX Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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