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Texas Instruments LMC6081IN/NOPB
- Part No.:
- LMC6081IN/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LMC6081IN/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,706
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Product details
Overview
LMC6081IN/NOPB from Texas Instruments is a precision single-channel CMOS operational amplifier optimized for ultra-low-input-bias-current, rail-to-rail output swing (within 20mV of rails at 2kΩ), and single-supply operation from 4.5V to 15.5V. It delivers 123dB open-loop gain, 150μV typical input offset voltage, and 10fA typical input bias current - making it ideal for photodiode preamplification, medical sensor front-ends, and high-impedance transducer signal conditioning.
For engineers reviewing the LMC6081IN/NOPB datasheet, LMC6081IN/NOPB pinout, LMC6081IN/NOPB application, or LMC6081IN/NOPB equivalent, key selection criteria include verified input bias current ≤10fA at 25°C, guaranteed rail-to-rail output swing under 2kΩ load, confirmed SOIC-8 package compatibility, and documented performance in charge-amplifier and instrumentation-amplifier topologies with RES11A matched resistor networks.
Technical Context
The LMC6081IN/NOPB employs a proprietary CMOS input stage enabling input common-mode range extending to V– and ultra-low leakage (10fA), while its output stage uses a rail-to-rail complementary architecture delivering 20mV headroom at 2kΩ. Its 1.3MHz gain-bandwidth product and 0.8–1.5V/µs slew rate support precision DC and low-frequency AC signal amplification without phase-margin degradation in standard configurations.
Unlike micropower op-amps, the LMC6081IN/NOPB integrates enhanced latch-up immunity via process-level SCR suppression and maintains stability with capacitive loads when paired with external pull-up resistors or feedback compensation - critical for sample-and-hold and DAC buffer applications where output settling and leakage integrity are non-negotiable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input offset voltage | ±150 µV typical - enables sub-mV error in 12-bit+ precision DC measurement paths |
| Input bias current | 10 fA typical at 25°C - preserves signal integrity in >100 GΩ source impedance circuits (e.g., piezoelectric sensors) |
| Supply voltage range | 4.5V to 15.5V single supply - supports battery-powered portable instrumentation without dual-rail generation |
| Output swing | Within 20 mV of V+ and V– at 2kΩ - maximizes dynamic range in single-supply systems with limited headroom |
| Open-loop gain | 123 dB (400 V/mV) typical - ensures <0.01% gain error in unity-gain buffers and high-precision amplifiers |
| Gain bandwidth product | 1.3 MHz - sufficient for 10kHz bandwidth in G=100 configurations with stable phase margin |
| Input common-mode range | Includes V– (ground) - allows direct interfacing with grounded-sensor outputs without level-shifting circuitry |
Pinout & Package
LMC6081IN/NOPB is housed in an 8-pin SOIC (D package) with industry-standard footprint and thermal resistance of 193°C/W (junction-to-ambient). Pin 1 and Pin 5 are no-connect (NC); all NC pins may be left floating per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 3) | Noninverting input | High-impedance node accepting signals down to V–; guard-ring routing required for <100fA leakage |
| –IN (Pin 2) | Inverting input | Feedback node; sensitive to stray capacitance - requires guarded trace layout per TI layout guidelines |
| OUT (Pin 6) | Amplifier output | Rail-to-rail capable; drives 2kΩ loads to within 20mV of rails; sinking/sourcing up to 30mA short-circuit current |
| V+ (Pin 7) | Positive supply | Highest potential rail; must be decoupled with ≥0.1µF ceramic capacitor near pin |
| V– (Pin 4) | Negative supply | Lowest potential rail (often ground in single-supply); reference for input common-mode and output swing |
| NC (Pins 1, 5, 8) | No internal connection | Electrically isolated; may be left unconnected or tied to V– for mechanical stability - no functional impact |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 10 fA typical at 25°C - enables accurate integration and charge amplification with pC-level input signals |
| Rail-to-rail output swing | 20 mV from rails at 2kΩ - eliminates need for level-shifting in single-supply data acquisition front-ends |
| Input common-mode range including V– | Operates with inputs at ground potential - simplifies interface to grounded transducers and bridge sensors |
| High open-loop gain | 123 dB (400 V/mV) - ensures <0.005% gain error in precision instrumentation amplifier topologies |
| Improved latch-up immunity | Process-hardened against SCR-triggering events - enhances reliability in noisy industrial environments |
Applications
| Photodiode Preamp | Medical Instrumentation |
|---|---|
Use Scenario: Amplifying weak current from reverse-biased silicon photodiodes in pulse oximetry or spectroscopy modules. IC Role / Device Role / Timing Role: Transimpedance amplifier with guarded input and low-noise feedback network. Use Value: 10fA input bias current prevents signal corruption from dark current; rail-to-rail output maximizes ADC utilization in 3.3V/5V systems. |
Use Scenario: Front-end amplification of biopotential signals (ECG, EEG) from dry-electrode or gel-based sensors. IC Role / Device Role / Timing Role: First-stage differential amplifier in 3-op-amp instrumentation topology with RES11A matched resistors. Use Value: Input common-mode range to V– enables direct connection to patient-referenced electrodes; <2.5µV/°C drift ensures stable baseline over body temperature variation. |
| Charge Amplifier | Transducer Signal Conditioning |
Use Scenario: Converting high-impedance charge output from piezoelectric accelerometers or pressure sensors into low-impedance voltage. IC Role / Device Role / Timing Role: Integrator with ultra-high-input-impedance (>10 TΩ) and low-offset drift. Use Value: 150µV offset and 1µV/°C drift minimize baseline drift in long-duration vibration monitoring; 123dB gain ensures stable integration over decades of time constant. |
Use Scenario: Amplifying millivolt-level outputs from silicon strain gauges, thermopiles, or RTDs in industrial process control. IC Role / Device Role / Timing Role: Precision non-inverting amplifier with gain-setting resistors and buffered reference. Use Value: 4.5–15.5V single-supply operation matches PLC analog I/O rails; PSRR >75dB rejects power rail noise in electrically noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision low-input-bias-current operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1050CN8#PBF | Chopper-stabilized architecture; 0.5µV max offset; 50pA input bias; 1.5MHz GBW; requires external nulling capacitor | Better DC accuracy but higher noise floor (25nV/√Hz vs 22nV/√Hz); less suitable for high-frequency photodiode pulse response | Select LTC1050CN8#PBF only when sub-µV offset dominates design requirements and chopper ripple is acceptable |
| OPA377AIDR | CMOS input; 250µV max offset; 10pA input bias; 10MHz GBW; rail-to-rail input/output; 1.8–5.5V supply | Higher bandwidth and rail-to-rail input, but narrower supply range limits use in 12V industrial systems | Choose OPA377AIDR for battery-powered portable devices needing >1MHz bandwidth and 3.3V operation |
Compared with LTC1050CN8#PBF and OPA377AIDR, the LMC6081IN/NOPB uniquely balances ultra-low bias current (10fA), wide 4.5–15.5V supply, and proven stability in charge-amplifier layouts - making it the preferred choice for legacy and new designs requiring robustness across temperature and supply variations without chopper artifacts.
Availability
LMC6081IN/NOPB is available at Aetrix Electronics and suitable for medical instrumentation, photodiode signal chains, and industrial transducer interfaces requiring stable component supply across extended production lifecycles.
Supply support for LMC6081IN/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 over 50 years of innovation in precision amplifiers and signal-chain solutions.
The LMC6081IN/NOPB belongs to TI's LMC608x family of precision CMOS op-amps designed specifically for ultra-high-impedance, low-leakage applications such as sensor front-ends, medical diagnostics, and analytical instrumentation where input bias current and offset stability are critical.
FAQ
What is the maximum supply voltage for LMC6081IN/NOPB?
The absolute maximum supply voltage for LMC6081IN/NOPB is 16V (V+ – V–), but the recommended operating range is 4.5V to 15.5V for single-supply use. Exceeding 15.5V risks reliability degradation, especially when sourcing current to V+ above 13V - as explicitly warned in TI's datasheet Section 5.1.
Does LMC6081IN/NOPB support rail-to-rail input?
No, LMC6081IN/NOPB does not support rail-to-rail input. Its input common-mode range extends to V– (including ground) but stops at (V+) – 1.9V minimum. This means the maximum allowable input voltage is typically ~1.9V below the positive rail - confirmed in Table 5.7 under "Input Voltage Common-Mode Range".
Can LMC6081IN/NOPB drive capacitive loads directly?
LMC6081IN/NOPB is not optimized for direct capacitive loading. As noted in Section 6.1.3, large capacitive loads reduce phase margin and cause oscillation. TI recommends using a pull-up resistor to V+ or adding R1/C1 compensation (Figure 6-2) - both validated methods for stabilizing LMC6081IN/NOPB when driving >100pF loads.
What is the quiescent current of LMC6081IN/NOPB at 5V supply?
At VS = 5V and TA = 25°C, the LMC6081IN/NOPB draws 0.45–0.75 mA per amplifier (Table 5.7). Over temperature (–40°C to +85°C), quiescent current rises to ≤0.9 mA - making it suitable for low-power portable instrumentation without compromising precision.
Is LMC6081IN/NOPB pin-compatible with other LMC608x variants?
No, LMC6081IN/NOPB is not pin-compatible with LMC6082 or LMC6084. While all share the SOIC-8 package footprint, the LMC6081IN/NOPB has only one amplifier channel and unique pin mapping (e.g., OUT on Pin 6, NC on Pins 1/5/8), whereas LMC6082 places OUT A on Pin 1 and OUT B on Pin 7 - requiring PCB redesign for substitution.
LMC6081IN/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.5V/µs
- Gain Bandwidth Product:
- 1.3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.01 pA
- Voltage - Input Offset:
- 150 µV
- Current - Supply:
- 550µA
- Current - Output / Channel:
- 34 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 15.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LMC6081IN/NOPB FAQ
1.How can I place an order for LMC6081IN/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6081IN/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 LMC6081IN/NOPB reliable?
The price and inventory of LMC6081IN/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6081IN/NOPB is usually 5 days.
3.What payment methods are accepted for LMC6081IN/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6081IN/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6081IN/NOPB?
LMC6081IN/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6081IN/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 LMC6081IN/NOPB?
For technical support, including LMC6081IN/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6081IN/NOPB requirements.
6.How does Aetrix verify that LMC6081IN/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC6081IN/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 LMC6081IN/NOPB meets industry standards.
7.What is the process for return or replacement of LMC6081IN/NOPB?
All LMC6081IN/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC6081IN/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 LMC6081IN/NOPB part is unused and in its original packaging.
Return procedure for LMC6081IN/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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