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Texas Instruments LMC6081AIMX/NOPB
- Part No.:
- LMC6081AIMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6081AIMX/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,557
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Product details
Overview
LMC6081AIMX/NOPB from Texas Instruments is a precision single-channel CMOS operational amplifier optimized for ultra-low-input-bias-current applications including photodiode preamplification, medical instrumentation, and high-impedance transducer signal conditioning. It delivers 150 µV typical offset voltage, 10 fA typical input bias current, rail-to-rail output swing within 20 mV of supply rails (at 2 kΩ load), and operates from 4.5 V to 15.5 V single supply.
For engineers reviewing the LMC6081AIMX/NOPB datasheet, LMC6081AIMX/NOPB pinout, LMC6081AIMX/NOPB application, or LMC6081AIMX/NOPB equivalent, this page provides verified specifications, SOIC-8 package layout, real-world use cases in precision analog front-ends, and validated alternative options for low-leakage, single-supply op amp selection.
Technical Context
The LMC6081AIMX/NOPB employs a proprietary CMOS input stage enabling sub-picoampere input bias current and input common-mode range extending to V– (ground in single-supply operation). Its rail-to-rail output stage uses complementary push-pull architecture with internal compensation for stability across capacitive loads up to 100 pF when properly configured with external resistive isolation.
It features 123 dB open-loop voltage gain (at 2 kΩ load), 1.3 MHz gain-bandwidth product, and 0.8–1.5 V/µs slew rate - balancing precision DC performance with usable AC response for sensor interfacing and precision signal conditioning where leakage and offset dominate error budgets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 10 fA typical - enables accurate amplification of picoamp-level photodiode or piezoelectric sensor currents without significant input error. |
| Input Offset Voltage | ±150 µV typical - supports high-gain DC-coupled stages (e.g., instrumentation amps) with <0.01% gain error at 1000× gain. |
| Supply Range | 4.5 V to 15.5 V single supply - allows direct battery (e.g., 9 V) or regulated rail operation without dual supplies. |
| Output Swing | Within 20 mV of V+ and V– at 2 kΩ load - preserves dynamic range near supply rails for low-voltage ADC interfacing. |
| Open-Loop Gain | 123 dB (2×10⁶ V/V) at 2 kΩ load - ensures <1 ppm gain error in unity-gain buffer or high-precision integrator configurations. |
| Gain Bandwidth | 1.3 MHz - supports stable closed-loop operation up to ~100 kHz at G = 10, suitable for slow-scan medical waveforms and sensor data acquisition. |
| CMRR / PSRR | 75–85 dB (CMRR), 75–94 dB (PSRR) - rejects power supply ripple and common-mode interference in noisy industrial or portable environments. |
Pinout & Package
LMC6081AIMX/NOPB is housed in an 8-pin SOIC (D package), 1.27 mm pitch, with exposed pad not present. Pin 1 is top-left corner (dot-marked), pin 8 is top-right. The device uses standard SOIC-8 footprint compatible with automated assembly and reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 3) | Noninverting Input | High-impedance node (10 TΩ) accepting signal reference or sensor output; requires guarding in >100 MΩ source impedance designs. |
| –IN (Pin 2) | Inverting Input | Feedback node for transimpedance or inverting amplifier configurations; sensitive to stray capacitance above 1 pF. |
| OUT (Pin 6) | Amplifier Output | Rail-to-rail capable output driving ≥2 kΩ loads; may require series resistor or pull-up for >100 pF capacitive loads. |
| V+ (Pin 7) | Positive Supply | Connects to main supply rail (4.5–15.5 V); decoupling capacitor (0.1 µF ceramic) required within 5 mm. |
| V– (Pin 4) | Negative Supply / Ground | Reference return for single-supply operation; must be low-impedance ground plane connection to minimize noise coupling. |
| NC (Pins 1, 5, 8) | No Internal Connection | Unbonded pins - electrically isolated; may be left floating or tied to V– for mechanical stability; no routing required. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 10 fA typical enables direct connection to high-impedance sources (e.g., pH electrodes, piezoelectric sensors) without signal attenuation. |
| Rail-to-rail output swing | Swings to within 20 mV of both supply rails at 2 kΩ load - maximizes usable ADC input range in 3.3 V or 5 V systems. |
| Input common-mode range includes V– | Operates with inputs down to ground in single-supply mode - eliminates need for level-shifting circuitry in grounded-sensor applications. |
| High open-loop gain & CMRR | 123 dB AOL and 85 dB CMRR ensure minimal gain error and rejection of bridge imbalance or ECG electrode common-mode noise. |
| Improved latch-up immunity | Robust CMOS process design withstands transient overvoltage on inputs or outputs without destructive latch-up - critical for field-deployed instrumentation. |
Applications
| Photodiode Preamp | Medical Instrumentation |
|---|---|
Use Scenario: Amplifying nanoamp-level photocurrent from silicon photodiodes in spectrophotometers or pulse oximeters. IC Role / Device Role / Timing Role: Transimpedance amplifier converting current to voltage with minimal input error and drift. Use Value: 10 fA input bias current prevents signal loss; 150 µV offset avoids baseline shift in DC-coupled optical measurements. |
Use Scenario: Front-end amplification of biopotential signals (ECG, EEG) from dry or gel electrodes. IC Role / Device Role / Timing Role: High-input-impedance buffer and gain stage preserving microvolt-level differential signals. Use Value: Input common-mode range to V– supports grounded electrode configurations; 85 dB CMRR suppresses 50/60 Hz mains interference. |
| Transducer Signal Conditioning | Charge Amplifier for Piezo Sensors |
Use Scenario: Conditioning output from high-impedance silicon pressure or humidity transducers in environmental monitoring. IC Role / Device Role / Timing Role: Precision noninverting amplifier with gain stabilization against temperature-induced zero-point drift. Use Value: 1 µV/°C offset drift minimizes calibration frequency; rail-to-rail output interfaces directly with 12-bit SAR ADCs. |
Use Scenario: Integrating charge from piezoelectric accelerometers or acoustic emission sensors in structural health monitoring. IC Role / Device Role / Timing Role: Low-drift, low-bias-current integrator converting charge pulses into measurable voltage steps. Use Value: 10 fA input bias current prevents integrator droop over seconds-scale measurement windows; 123 dB open-loop gain ensures linearity. |
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 |
|---|---|---|---|
| LTC1050CS8#PBF | Chopper-stabilized architecture; 0.5 µV max offset, but 50 pA input bias current - 5000× higher than LMC6081AIMX/NOPB. | Better DC accuracy in ultra-low-drift applications; unsuitable for picoamp photodiode current sensing due to higher input leakage. | Select when sub-microvolt offset dominates system error budget and input current >100 pA is acceptable. |
| OPA377AIDBVR | CMOS input; 25 µV max offset, 10 pA input bias current - 1000× higher bias current than LMC6081AIMX/NOPB. | Faster (10 MHz GBW) and lower noise (4.5 nV/√Hz), but insufficient for femtoamp-level sensor interfacing. | Choose when bandwidth >1 MHz is required and input impedance >1 GΩ suffices - e.g., general-purpose precision signal chains. |
Compared with LTC1050CS8#PBF and OPA377AIDBVR, the LMC6081AIMX/NOPB uniquely balances femtoamp input bias current with 1.3 MHz bandwidth and rail-to-rail output - making it irreplaceable in ultra-high-impedance, single-supply sensor front-ends where leakage-induced error must remain below 100 µV.
Availability
LMC6081AIMX/NOPB is available at Aetrix Electronics and suitable for photodiode preamplification, medical biopotential acquisition, and high-impedance transducer signal conditioning requiring stable component supply across production lifecycles.
Supply support for LMC6081AIMX/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 delivering analog and embedded processing solutions, with over 50 years of innovation in precision analog ICs and broad industrial portfolio support.
The LMC6081AIMX/NOPB belongs to TI's LMC608x precision CMOS op amp family, designed specifically for ultra-low-input-bias-current, single-supply operation in high-impedance sensor interface and medical instrumentation applications.
FAQ
What is the maximum operating supply voltage for LMC6081AIMX/NOPB?
The LMC6081AIMX/NOPB supports a maximum supply voltage of 15.5 V in single-supply mode and ±7.75 V in dual-supply mode. Absolute maximum rating is 16 V across V+ and V–; exceeding this risks permanent damage. Operation above 13 V requires limiting output short-circuit current to avoid reliability degradation per TI's datasheet Section 5.1.
Does LMC6081AIMX/NOPB support true rail-to-rail input?
No - the LMC6081AIMX/NOPB supports rail-to-rail *output* swing (within 20 mV of V+ and V–), but its input common-mode range extends only to V– and up to (V+) – 1.9 V at 25°C. It does not accept signals at the positive rail, so input signals must stay ≥1.9 V below V+ for full CMRR performance.
Can LMC6081AIMX/NOPB drive capacitive loads directly?
LMC6081AIMX/NOPB is not optimized for direct capacitive loading. Driving >50 pF without external compensation causes phase-margin reduction and potential oscillation. TI recommends using a series resistor (e.g., 100 Ω) between output and load, or adding a pull-up resistor to V+ for improved stability - details in Section 6.1.3 of the datasheet.
What is the typical input offset voltage drift of LMC6081AIMX/NOPB over temperature?
The LMC6081AIMX/NOPB exhibits a typical input offset voltage drift of 1 µV/°C over the full –40°C to +85°C operating range. This low drift ensures minimal baseline shift in precision DC-coupled applications such as laboratory-grade pH meters or strain gauge bridges.
Is LMC6081AIMX/NOPB pin-compatible with other LMC608x variants?
No - LMC6081AIMX/NOPB (single-channel, SOIC-8) has a unique pinout distinct from LMC6082 (dual-channel, SOIC-8) and LMC6084 (quad-channel, SOIC-14). Pin functions differ significantly: LMC6081 uses pins 1,5,8 as NC, while LMC6082 assigns those pins to active channels. PCB layout and schematic symbols are not interchangeable.
LMC6081AIMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 15.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMC6081AIMX/NOPB FAQ
1.How can I place an order for LMC6081AIMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6081AIMX/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 LMC6081AIMX/NOPB reliable?
The price and inventory of LMC6081AIMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6081AIMX/NOPB is usually 5 days.
3.What payment methods are accepted for LMC6081AIMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6081AIMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6081AIMX/NOPB?
LMC6081AIMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6081AIMX/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 LMC6081AIMX/NOPB?
For technical support, including LMC6081AIMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6081AIMX/NOPB requirements.
6.How does Aetrix verify that LMC6081AIMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC6081AIMX/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 LMC6081AIMX/NOPB meets industry standards.
7.What is the process for return or replacement of LMC6081AIMX/NOPB?
All LMC6081AIMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC6081AIMX/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 LMC6081AIMX/NOPB part is unused and in its original packaging.
Return procedure for LMC6081AIMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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