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Texas Instruments LMC6081IMX
- Part No.:
- LMC6081IMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6081IMX.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,671
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Product details
Overview
LMC6081IMX from Texas Instruments is a precision single-channel CMOS operational amplifier optimized for ultra-low-input-bias-current, rail-to-rail output swing, and single-supply operation from 4.5V to 15.5V. It delivers 150μV typical offset voltage, 10fA typical input bias current, 123dB open-loop gain (2kΩ load), and output swing within 20mV of both supply rails - making it ideal for photodiode preamplification, medical instrumentation front-ends, and high-impedance transducer signal conditioning.
For engineers reviewing the LMC6081IMX datasheet, LMC6081IMX pinout, LMC6081IMX application, or LMC6081IMX equivalent, this page provides verified technical context, real-world design meaning for key specs, validated SOIC-8 pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The LMC6081IMX employs a proprietary CMOS input stage enabling input common-mode range extending to V– (ground in single-supply mode) and ultra-low 10fA input bias current at 25°C. Its output stage supports rail-to-rail swing into 2kΩ loads while maintaining >123dB DC open-loop gain and 1.3MHz gain-bandwidth product.
This architecture enables stable operation with capacitive loads when paired with appropriate pull-up resistors or feedback compensation, and includes enhanced latch-up immunity via internal SCR suppression techniques - critical for high-reliability sensor interfaces where input leakage and output fidelity directly impact measurement accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | ±150 μV typical - enables sub-millivolt DC accuracy in precision amplification without trimming. |
| Input Bias Current | 10 fA typical at 25°C - preserves signal integrity in picoamp-level photodiode or piezoelectric charge amplifier circuits. |
| Supply Range | 4.5V to 15.5V single supply - supports battery-powered portable instrumentation and industrial 12V systems. |
| Output Swing | Within 20 mV of V+ and V– (2kΩ load) - maximizes dynamic range in low-voltage data acquisition stages. |
| Open-Loop Gain | 123 dB (2kΩ load) - ensures <0.01% gain error in unity-gain buffers and high-precision closed-loop configurations. |
| Gain Bandwidth | 1.3 MHz - supports accurate amplification of low-frequency sensor signals up to ~100 kHz with minimal phase lag. |
| Input Common-Mode Range | Includes V– (ground) - allows direct interfacing with grounded sensors and single-ended transducers without level-shifting. |
Pinout & Package
LMC6081IMX is housed in an 8-pin SOIC (D package), with thermal resistance RθJA = 193°C/W. The device features three no-connect (NC) pins to isolate sensitive analog inputs and reduce parasitic coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 3) | Noninverting input | High-impedance node (10 TΩ) accepting signal reference or sensor positive terminal; requires guard ring layout for <100 fA leakage. |
| –IN (Pin 2) | Inverting input | Feedback node for closed-loop configurations; sensitive to stray capacitance - compensation capacitor Cf required with R>1 MΩ. |
| OUT (Pin 6) | Amplifier output | Rail-to-rail capable output driving 2kΩ loads; sinking/sourcing up to 30 mA; requires series resistor for direct capacitive load drive. |
| V+ (Pin 7) | Positive power supply | Highest potential supply rail (up to 15.5V); must be decoupled with ≥0.1 μF ceramic near pin to suppress high-frequency noise. |
| V– (Pin 4) | Negative power supply | Lowest potential rail (typically ground in single-supply use); serves as reference for input common-mode and output swing. |
| NC (Pins 1, 5, 8) | No internal connection | Unused terminals - may be left floating or tied to V– for mechanical stability; not electrically connected to die. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full-scale signal headroom (e.g., 0.02V to 4.98V on 5V supply), eliminating need for dual supplies in portable medical devices. |
| Ultra-low input bias current | 10 fA typical enables accurate integration of charge from piezoelectric transducers and photodiodes without signal decay. |
| Input common-mode range includes V– | Supports direct connection of grounded sensors (e.g., pH electrodes, RTDs) without external level shifters or bias networks. |
| High CMRR and PSRR | ≥75 dB CMRR and ≥84 dB PSRR minimize error from supply ripple and common-mode interference in noisy industrial environments. |
| Enhanced latch-up immunity | Robust against transient-induced SCR triggering - critical for field-deployed instrumentation exposed to ESD or power surges. |
Applications
| Photodiode Preamp | Medical Instrumentation Front-End |
|---|---|
Use Scenario: Amplifying weak current from silicon photodiodes in pulse oximeters or spectrophotometers. IC Role / Device Role / Timing Role: Transimpedance amplifier converting pA-level photocurrent to measurable voltage with minimal input loading. Use Value: 10 fA input bias current prevents signal attenuation; rail-to-rail output preserves full ADC input range under varying LED drive conditions. |
Use Scenario: Conditioning biopotential signals (e.g., ECG, EEG) from dry-electrode sensors with high source impedance. IC Role / Device Role / Timing Role: First-stage buffer and gain stage in instrumentation amplifier topology using RES11A matched resistors. Use Value: Input common-mode range including V– enables true single-supply operation; 150 μV offset minimizes baseline drift in long-duration patient monitoring. |
| Piezoelectric Charge Amplifier | Transducer Signal Conditioning |
Use Scenario: Integrating charge output from accelerometers or pressure sensors in structural health monitoring systems. IC Role / Device Role / Timing Role: Precision integrator with ultra-high input impedance preventing charge leakage during integration window. Use Value: 10 TΩ input resistance sustains integration time constants >10 seconds; low offset ensures DC stability over temperature. |
Use Scenario: Amplifying low-level outputs from silicon strain gauges or humidity sensors in industrial process control. IC Role / Device Role / Timing Role: High-gain, low-noise signal conditioner placed immediately after sensor to avoid cable-induced noise pickup. Use Value: 22 nV/√Hz input voltage noise and 4 fA/√Hz current noise preserve SNR in microvolt-level bridge outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMC6061IMX | Lower quiescent current (0.35 mA vs 0.75 mA), but higher offset (±250 μV) and reduced GBW (0.35 MHz). | Better suited for battery-critical micropower designs where speed & offset tolerance are relaxed. | Select LMC6061IMX only when supply current is primary constraint and 1.3 MHz bandwidth is unnecessary. |
| OPA333AIDBVR | Zero-drift architecture (0.1 μV/°C drift), lower offset (±2 μV), but higher input bias current (200 pA) and limited rail-to-rail output drive. | Preferred for ultra-stable DC measurements (e.g., precision weigh scales), not high-impedance AC-coupled sensors. | Choose OPA333AIDBVR when long-term DC stability dominates over input leakage; avoid for photodiode or piezo applications. |
Compared with LMC6081IMX, LMC6061IMX trades bandwidth and precision for lower power, while OPA333AIDBVR sacrifices input impedance for zero-drift performance - neither offers pin compatibility, requiring PCB redesign for substitution.
Availability
LMC6081IMX is available at Aetrix Electronics and suitable for medical instrumentation, photodiode signal conditioning, and industrial transducer interface applications requiring stable component supply across extended production lifecycles.
Supply support for LMC6081IMX 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 amps and sensor interface solutions.
The LMC608x family was designed specifically for high-impedance, low-leakage precision analog signal chains - targeting applications where input bias current, offset voltage, and rail-to-rail output capability critically impact measurement fidelity.
FAQ
What is the maximum supply voltage for LMC6081IMX?
The absolute maximum supply voltage for LMC6081IMX is 16 V (single supply), but the recommended operating range is 4.5 V to 15.5 V. Exceeding 15.5 V risks reliability degradation, especially when sourcing current to V+ - TI explicitly warns against connecting the output directly to V+ above 13 V.
Does LMC6081IMX support true rail-to-rail input?
No - LMC6081IMX supports rail-to-rail *output* swing and its input common-mode range extends to V– (including ground), but does not reach V+. The input common-mode range is specified as (V–) – 0.1 V to (V+) – 1.9 V at 5 V supply, limiting high-side input headroom.
Can LMC6081IMX drive capacitive loads directly?
Direct capacitive loading degrades phase margin and can cause oscillation. LMC6081IMX requires external compensation - such as a series resistor between output and load, or a pull-up resistor to V+, or feedback capacitor Cf - to maintain stability with loads >100 pF, per TI's application guidance in Section 6.1.3.
What is the input impedance of LMC6081IMX?
LMC6081IMX has a minimum input resistance of 10 TΩ (1013 Ω) and typical input bias current of 10 fA at 25°C. This effective impedance enables use in ultra-high-impedance circuits like charge amplifiers and electrometer-grade sensor interfaces.
Is LMC6081IMX suitable for single-supply pH probe applications?
Yes - LMC6081IMX is well-suited for handheld pH probes due to its single-supply operation (4.5–15.5 V), input common-mode range including V– (ground), ultra-low input bias current (10 fA), and low offset (±150 μV), all of which preserve electrode potential accuracy and minimize calibration drift.
LMC6081IMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMC6081IMX FAQ
1.How can I place an order for LMC6081IMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6081IMX 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 LMC6081IMX reliable?
The price and inventory of LMC6081IMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6081IMX is usually 5 days.
3.What payment methods are accepted for LMC6081IMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6081IMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6081IMX?
LMC6081IMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6081IMX 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 LMC6081IMX?
For technical support, including LMC6081IMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6081IMX requirements.
6.How does Aetrix verify that LMC6081IMX is sourced from the original manufacturer or authorized distributors?
All LMC6081IMX 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 LMC6081IMX meets industry standards.
7.What is the process for return or replacement of LMC6081IMX?
All LMC6081IMX units undergo pre-shipment inspection (PSI). If there is an issue with LMC6081IMX, 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 LMC6081IMX part is unused and in its original packaging.
Return procedure for LMC6081IMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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