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Texas Instruments LMC662CM/NOPB
- Part No.:
- LMC662CM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC662CM/NOPB.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,755
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Product details
Overview
LMC662CM/NOPB from Texas Instruments is a dual CMOS rail-to-rail output operational amplifier optimized for single-supply precision signal conditioning. It delivers 126dB open-loop voltage gain, ultra-low 2fA input bias current, and 1.1V/μs slew rate across 4.75V–15.5V supply operation - enabling high-impedance buffering and low-leakage sample-and-hold in medical instrumentation and industrial sensor front-ends.
For engineers reviewing the LMC662CM/NOPB datasheet, LMC662CM/NOPB pinout, LMC662CM/NOPB application, or LMC662CM/NOPB equivalent, key selection criteria include its guaranteed 3mV max input offset voltage (–40°C to +85°C), 22nV/√Hz input voltage noise at 1kHz, rail-to-rail swing into 600Ω loads, and SOIC-8 package compatibility with legacy LM358 layouts.
Technical Context
The LMC662CM/NOPB uses a proprietary CMOS front-end topology that extends input common-mode range to V− while maintaining rail-to-rail output swing - critical for single-supply systems where ground-referenced inputs must drive full-scale outputs. Its differential input stage achieves 1.3μV/°C offset drift and >1TΩ input resistance without compromising stability into 600Ω loads.
Unlike conventional CMOS op amps, the LMC662CM/NOPB integrates an additional gain stage for improved sinking capability (100–250 V/mV into 600Ω), enabling accurate current-to-voltage conversion and long-term integration without external compensation. Its 1.4MHz gain-bandwidth product and 50° phase margin support stable unity-gain follower operation with proper capacitive load management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 2 fA typical - enables picoampere-level current sensing and femtoampere leakage-critical integrators |
| Input Offset Voltage | ±3 mV max (–40°C to +85°C) - ensures <1 LSB error in 12-bit ADC front-ends with 5V reference |
| Open-Loop Gain | 2000 V/mV into 2kΩ - maintains >60dB closed-loop accuracy for gains up to 1000 with minimal error |
| Slew Rate | 1.1 V/μs - supports 10kHz full-scale sine-wave output with <0.1% distortion into 2kΩ |
| Supply Range | 4.75V to 15.5V single supply - operates directly from 5V or 12V rails without regulation |
| Output Swing | Rail-to-rail into 2kΩ (e.g., 0.15V to 4.87V on 5V) - maximizes dynamic range in unipolar data acquisition |
| Input Noise | 22 nV/√Hz at 1kHz - preserves SNR in low-level sensor amplification before digitization |
Pinout & Package
LMC662CM/NOPB is housed in an 8-pin SOIC (D package) with standard dual-op-amp pinout and surface-mount footprint compatible with JEDEC MS-012AC. Thermal resistance is 165°C/W junction-to-ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | High-impedance node for sensor or reference signal routing; 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 parasitics 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) | Negative power supply | Ground reference in single-supply mode; must be decoupled with 0.1μF ceramic near pin |
| +IN B (Pin 5) | Noninverting input, Channel B | Independent high-Z input for dual-path signal conditioning; shares same ultra-low bias current spec as Channel A |
| –IN B (Pin 6) | Inverting input, Channel B | Configurable for independent gain stage; no crosstalk (<130dB isolation) between channels at 1kHz |
| OUT B (Pin 7) | Output, Channel B | Full rail-to-rail swing matching OUT A; usable for differential output stages or independent signal paths |
| V+ (Pin 8) | Positive power supply | Accepts 4.75V–15.5V; quiescent current per amplifier is 375–650μA, independent of V+ |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing into 600Ω | Enables full-scale analog output in 3.3V/5V microcontroller interfaces without level-shifting circuitry |
| Input common-mode range includes V− | Supports ground-referenced sensor inputs (e.g., thermocouples, bridge transducers) in single-supply systems |
| Ultra-low 2fA input bias current | Reduces voltage error to <1μV in 1GΩ feedback networks - essential for photodiode and piezoelectric amplifiers |
| Specified performance into 2kΩ and 600Ω loads | Guarantees gain accuracy and settling time in real-world resistive loads, not just ideal high-Z conditions |
| 1.3μV/°C offset voltage drift | Minimizes calibration drift over industrial temperature range (–40°C to +85°C), reducing recalibration frequency |
Applications
| High-Impedance Buffer | Precision Current-to-Voltage Converter |
|---|---|
|
Use Scenario: Amplifying output of pH electrode or ion-selective sensor with >100MΩ source impedance. IC Role / Device Role / Timing Role: High-Z buffer isolating sensor from downstream ADC input capacitance and noise. Use Value: 2fA bias current prevents >1mV offset error in 1GΩ electrode interface; rail-to-rail swing preserves full 0–5V measurement range. |
Use Scenario: Converting 0–100nA photodiode current to 0–5V output for optical smoke detector. IC Role / Device Role / Timing Role: Transimpedance amplifier with 50MΩ feedback resistor and guarded input node. Use Value: 3mV max VOS contributes <0.06% full-scale error; 22nV/√Hz noise ensures >60dB SNR at 1kHz detection bandwidth. |
| Long-Term Integrator | Medical Instrumentation Front-End |
|
Use Scenario: Charge integration for radiation dosimeter using 100pF capacitor and 10GΩ feedback path. IC Role / Device Role / Timing Role: Ultra-low-leakage integrator core with guarded summing junction and low-drift VOS. Use Value: 1.3μV/°C drift limits integration error to <10μV/hour over 8-hour clinical shift; 2fA IB ensures <0.1pC/hour leakage-induced drift. |
Use Scenario: ECG lead amplifier with right-leg drive and 50Hz notch filtering in portable monitor. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer with matched gain-setting resistors. Use Value: 126dB gain and >85dB CMRR suppress common-mode interference; rail-to-rail output drives 12-bit SAR ADC directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM358DR | Higher 20nA input bias current, lower 100dB gain, wider 3–32V supply range, no rail-to-rail output | Acceptable for non-critical 8-bit sensor interfaces but unsuitable for pA-level current sensing or ground-sensing bridges | Select LMC662CM/NOPB when sub-nA bias current, rail-to-rail swing, or <3mV VOS is required; LM358DR only where cost dominates and specs permit |
| OPA2333AIDR | Zero-drift architecture, 0.02μV/°C drift, 17nV/√Hz noise, but 50pA input bias current and higher 175μA IQ | Better for DC-critical applications like precision weight scales; less suitable for high-Z AC-coupled sensors due to higher IB | Choose OPA2333AIDR for ultra-low drift in battery-powered devices; retain LMC662CM/NOPB for femtoampere leakage integrity and 5V/12V single-supply simplicity |
Compared with LM358DR and OPA2333AIDR, LMC662CM/NOPB uniquely balances femtoampere input bias, rail-to-rail output, and robust 600Ω drive capability - making it optimal for high-impedance sensor buffers where both leakage and dynamic range matter, without zero-drift complexity or excessive quiescent power.
Availability
LMC662CM/NOPB is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor interfaces, and precision analog front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMC662CM/NOPB 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 LMC662CM/NOPB belongs to TI's LMC66x family of CMOS rail-to-rail op amps engineered specifically for single-supply, high-impedance, low-leakage applications in medical, industrial, and automotive sensor signal chains.
FAQ
What is the maximum capacitive load the LMC662CM/NOPB can drive stably?
The LMC662CM/NOPB can oscillate with capacitive loads >100pF in unity-gain configuration. Stability is restored by adding a 50–100Ω series resistor at the output and a 5–10pF feedback capacitor from output to inverting input. For loads >1nF, a pullup resistor to V+ (≥500μA current) improves response without degrading DC accuracy. Always verify stability on the final PCB layout.
Does the LMC662CM/NOPB support true single-supply operation with input down to ground?
Yes. The LMC662CM/NOPB features an input common-mode range that includes V− (ground in single-supply mode), allowing direct connection of ground-referenced sensors like thermocouples or resistive bridges. Its rail-to-rail output swing further enables full dynamic range utilization from 0V to V+ without external level-shifting circuitry.
How does the LMC662CM/NOPB compare to the LM358 in pin compatibility and performance?
The LMC662CM/NOPB is pin-for-pin compatible with the LM358 in SOIC-8 packaging, enabling drop-in replacement in existing designs. However, it delivers superior performance: 2fA vs 20nA input bias current, 126dB vs 100dB open-loop gain, rail-to-rail output vs limited swing, and 1.1V/μs vs 0.6V/μs slew rate - all while operating from the same 5V supply.
What layout techniques are required to achieve the specified 2fA input bias current?
To realize the LMC662CM/NOPB's 2fA input bias current, implement guard rings around both inputs and feedback nodes, tied to the same potential (e.g., output or reference voltage). Use clean FR-4 PCB with solder mask over traces, avoid conformal coating near inputs, and ensure >10mm creepage distance from high-impedance nodes to adjacent voltages. Guard rings must be present on both top and bottom layers.
Is the LMC662CM/NOPB qualified for automotive applications?
The LMC662CM/NOPB is not AEC-Q200 qualified. It is rated for industrial temperature range (–40°C to +85°C) and intended for medical, industrial, and general-purpose precision analog applications. For automotive use, TI offers the LMC662QML-SP (space-grade) or automotive-qualified alternatives like the TLV2462 - consult TI's automotive product selector for certified options.
LMC662CM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMC®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- 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:
- 750µA (x2 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMC662CM/NOPB FAQ
1.How can I place an order for LMC662CM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC662CM/NOPB 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 LMC662CM/NOPB reliable?
The price and inventory of LMC662CM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC662CM/NOPB is usually 5 days.
3.What payment methods are accepted for LMC662CM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC662CM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC662CM/NOPB?
LMC662CM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC662CM/NOPB 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 LMC662CM/NOPB?
For technical support, including LMC662CM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC662CM/NOPB requirements.
6.How does Aetrix verify that LMC662CM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC662CM/NOPB 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 LMC662CM/NOPB meets industry standards.
7.What is the process for return or replacement of LMC662CM/NOPB?
All LMC662CM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC662CM/NOPB, 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 LMC662CM/NOPB part is unused and in its original packaging.
Return procedure for LMC662CM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMC662CM/NOPB Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
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LM358ADR
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LM2904DGKR
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LM2902DR
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LM358P
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