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Texas Instruments LMC662AIM
- Part No.:
- LMC662AIM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC662AIM.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,105
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Product details
Overview
LMC662AIM 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 gain, 22nV/√Hz input voltage noise, ultra-low 2fA input bias current, and operates from 4.75V to 15.5V supply. It is used in high-impedance medical sensor front-ends requiring stable DC accuracy and low leakage.
For engineers reviewing the LMC662AIM datasheet, LMC662AIM pinout, LMC662AIM application, or LMC662AIM equivalent, key selection criteria include input offset drift (1.3μV/°C), rail-to-rail swing into 600Ω loads, quiescent current per amplifier (375–650μA), and guaranteed operation across –40°C to +85°C industrial temperature range.
Technical Context
The LMC662AIM employs a proprietary CMOS input stage with differential front-end architecture enabling input common-mode range extending to V− and rail-to-rail output swing. Its design supports both single-supply (4.75V–15.5V) and split-supply (±2.375V–±7.75V) operation while maintaining 1.1V/μs slew rate and 1.4MHz gain-bandwidth product.
It features ultra-high input resistance (>1TΩ), low THD (0.2% at 10kHz), and robust capacitive load tolerance when compensated with series output resistor and feedback capacitor. Input offset voltage is specified at ±3mV (max) over temperature, with PSRR exceeding 85dB on positive supply and 94dB on negative supply.
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 error (e.g., pH electrodes, piezoelectric sensors). |
| Input Offset Voltage | ±3mV max at TA = –40°C to +85°C; ensures <0.02% gain error in 100mV full-scale instrumentation amplifiers. |
| Rail-to-Rail Output | Swings within 150mV of rails into 2kΩ; delivers >97% of supply voltage headroom for maximum dynamic range in low-voltage systems. |
| Slew Rate | 1.1V/μs; supports clean 10kHz sine-wave output at 8Vpp with minimal distortion in precision active filters. |
| Quiescent Current | 375–650μA per amplifier; enables dual-channel precision amplification in battery-powered portable instruments. |
| Gain-Bandwidth Product | 1.4MHz; provides stable unity-gain bandwidth for anti-aliasing and sensor signal conditioning up to ~1MHz. |
Pinout & Package
LMC662AIM is housed in an 8-pin SOIC (D package) with standard dual op-amp pinout compatible with industry layout practices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Output | Amplifier A output; capable of sourcing/sinking ≥16mA into 2kΩ load with rail-to-rail swing. |
| 2 (–IN A) | Input | Inverting input for channel A; ultra-high impedance (>1TΩ) minimizes loading on high-Z sources. |
| 3 (+IN A) | Input | Noninverting input for channel A; common-mode range includes V−, enabling ground-referenced single-supply operation. |
| 4 (V–) | Power | Negative supply terminal; must be connected to system ground in single-supply configurations. |
| 5 (+IN B) | Input | Noninverting input for channel B; electrically isolated from channel A; supports independent dual-sensor buffering. |
| 6 (–IN B) | Input | Inverting input for channel B; matched input characteristics to channel A ensure consistent performance across both amplifiers. |
| 7 (OUT B) | Output | Amplifier B output; identical AC/DC specs to OUT A; crosstalk >130dB prevents inter-channel interference. |
| 8 (V+) | Power | Positive supply terminal; accepts up to 15.5V; internal regulation maintains stable bias under varying load conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full output voltage range into 2kΩ and 600Ω loads-critical for maximizing ADC resolution in low-voltage data acquisition. |
| Ultra-low input bias current | 2fA typical enables accurate long-term integration and picoampere-level current measurement without guard-ring complexity. |
| Low input offset drift | 1.3μV/°C ensures <10μV total drift over –40°C to +85°C-essential for uncalibrated medical thermistor interfaces. |
| Specified for 600Ω loads | Guarantees performance driving low-impedance DAC buffers or analog multiplexer outputs without external gain staging. |
| High voltage gain | 126dB open-loop gain supports stable closed-loop gains >1000 with <0.01% linearity error in precision transducer signal chains. |
Applications
| High-Impedance Sensor Buffer | Precision Current-to-Voltage Converter |
|---|---|
Use Scenario: Amplifying output of a glass pH electrode (100MΩ–1GΩ source impedance) in portable water quality analyzers. IC Role / Device Role / Timing Role: High-Z buffer stage preserving signal integrity before 24-bit sigma-delta ADC sampling. Use Value: 2fA input bias current limits DC error to <1mV at 100MΩ source, eliminating need for expensive electrometer-grade components. | Use Scenario: Converting photodiode current (10pA–100nA) in clinical pulse oximetry front-end. IC Role / Device Role / Timing Role: Transimpedance amplifier with 10MΩ feedback resistor and 1.4MHz bandwidth. Use Value: 22nV/√Hz input voltage noise and 1.3μV/°C drift maintain SNR >85dB across operating temperature range. |
| Long-Term Integrator | Medical Instrumentation Front-End |
Use Scenario: Building a 10-second time-constant integrator for analog energy metering in smart grid sensors. IC Role / Device Role / Timing Role: Precision integrator core using 10nF capacitor and 1GΩ feedback resistor. Use Value: Ultra-low 2fA bias current reduces integration drift to <10mV/hour-enabling >12-hour unattended operation. | Use Scenario: Signal conditioning for ECG electrode inputs in portable patient monitors. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier first stage with matched gain and CMRR enhancement. Use Value: Rail-to-rail output swing into 600Ω loads drives ADC reference buffers directly, reducing component count by two op-amps per channel. |
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 |
|---|---|---|---|
| LMC662ACM | Same die, commercial temperature range (0°C to 70°C); higher max input offset voltage (±6mV) and lower PSRR (66dB). | Not suitable for automotive or industrial environments requiring –40°C operation or tighter DC accuracy. | Select LMC662AIM for designs needing guaranteed performance across –40°C to +85°C with ≤±3mV VOS. |
| OPA2333AIDR | Zero-drift architecture; 0.1μV/°C drift vs. 1.3μV/°C; higher quiescent current (17μA vs. 0.65mA); no rail-to-rail output into 600Ω. | Better for microvolt-level DC stability; unsuitable where 600Ω drive capability or ultra-low IQ is required. | Choose OPA2333AIDR only if sub-μV/°C drift dominates over power and drive requirements. |
Compared with LMC662ACM, the LMC662AIM offers extended temperature range and tighter offset specs; compared with OPA2333AIDR, it trades zero-drift performance for lower power, higher output drive, and rail-to-rail swing into real-world loads-making it optimal for portable, battery-powered precision analog front-ends.
Availability
LMC662AIM is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor signal conditioning, and portable test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LMC662AIM 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 innovation in precision op-amps and signal-chain solutions.
The LMC66x family was designed specifically for single-supply, high-impedance precision applications-including medical diagnostics, environmental sensing, and portable instrumentation-where ultra-low bias current and rail-to-rail output are mandatory.
FAQ
What is the maximum capacitive load the LMC662AIM can drive without oscillation?
The LMC662AIM is not inherently stable into large capacitive loads. When driving >100pF, instability may occur-especially in unity-gain follower configuration. Stability is restored using a 50Ω–100Ω series resistor at the output and a 5pF–10pF feedback capacitor from output to inverting input. The LMC662AIM datasheet Figure 6-3 documents this compensation method, and TI's application note SBAA313 provides layout guidance for high-CL designs. Always verify stability on the target PCB with actual load capacitance.
Does the LMC662AIM support true rail-to-rail input common-mode range?
The LMC662AIM input common-mode range extends to V− (including ground) but does not reach V+. At VS = 15V, the upper limit is (V+) – 1.9V, or ~13.1V. This "input to rail" (not rail-to-rail) behavior is confirmed in Section 5.6 of the datasheet under VCM specifications. For applications requiring full rail-to-rail input, consider alternatives like the OPA333 or LMP7721-but note those lack the LMC662AIM's 600Ω output drive capability.
Can the LMC662AIM operate from a 3.3V supply?
No-the LMC662AIM has a minimum specified supply voltage of 4.75V per Section 5.3 Recommended Operating Conditions. Operation below 4.75V is outside datasheet specifications and may result in degraded rail-to-rail output swing, reduced open-loop gain, increased input offset voltage, or failure to meet slew rate guarantees. For 3.3V systems, consider the TLV2462 or OPA2340, which are characterized down to 2.7V.
Is the LMC662AIM pin-compatible with the LM358?
Yes-the LMC662AIM shares identical 8-pin SOIC pinout with the LM358, including V+, –IN A, +IN A, V–, +IN B, –IN B, OUT B, and OUT A. However, the LMC662AIM requires higher minimum supply voltage (4.75V vs. LM358's 3V), draws less quiescent current (650μA vs. 700μA), and delivers superior input bias current (2fA vs. 45nA), making it a performance upgrade-not a drop-in replacement-without verifying supply and layout constraints.
What is the thermal resistance (θJA) of the LMC662AIM in SOIC package?
The LMC662AIM in 8-pin SOIC (D package) has a junction-to-ambient thermal resistance (θJA) of 165°C/W, as specified in Section 5.4 Thermal Information. This value assumes standard JEDEC 2-layer board conditions. Actual θJA will improve with added copper pour, thermal vias, or heatsinking. At maximum rated power dissipation and 85°C ambient, junction temperature remains within safe limits (<150°C) only if power per amplifier stays below ~390mW.
LMC662AIM 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:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMC662AIM FAQ
1.How can I place an order for LMC662AIM through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC662AIM 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 LMC662AIM reliable?
The price and inventory of LMC662AIM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC662AIM is usually 5 days.
3.What payment methods are accepted for LMC662AIM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC662AIM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC662AIM?
LMC662AIM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC662AIM 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 LMC662AIM?
For technical support, including LMC662AIM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC662AIM requirements.
6.How does Aetrix verify that LMC662AIM is sourced from the original manufacturer or authorized distributors?
All LMC662AIM 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 LMC662AIM meets industry standards.
7.What is the process for return or replacement of LMC662AIM?
All LMC662AIM units undergo pre-shipment inspection (PSI). If there is an issue with LMC662AIM, 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 LMC662AIM part is unused and in its original packaging.
Return procedure for LMC662AIM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMC662AIM Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
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