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Texas Instruments LMC6081AIM/NOPB
- Part No.:
- LMC6081AIM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6081AIM/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,971
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Product details
Overview
LMC6081AIM/NOPB from Texas Instruments is a precision single-channel CMOS operational amplifier optimized for ultra-low-input-bias-current signal conditioning in high-impedance sensor interfaces. It delivers 150 μV typical input offset voltage, 10 fA typical input bias current, rail-to-rail output swing within 20 mV of supply rails (at 2 kΩ), and operates from 4.5 V to 15.5 V single supply - enabling direct interfacing with photodiodes, piezoelectric transducers, and medical biosensors.
For engineers reviewing the LMC6081AIM/NOPB datasheet, LMC6081AIM/NOPB pinout, LMC6081AIM/NOPB application, or LMC6081AIM/NOPB equivalent, key selection criteria include verified input bias current stability over temperature, confirmed rail-to-rail output drive into 2 kΩ loads, validated common-mode range extending to V–, and documented open-loop gain >123 dB - all critical for low-leakage instrumentation amplifier front-ends and charge amplifiers.
Technical Context
The LMC6081AIM/NOPB employs a proprietary CMOS input stage with guarded differential pair architecture to achieve 10 fA input bias current while maintaining 123 dB open-loop voltage gain and 1.3 MHz gain-bandwidth product. Its output stage uses complementary rail-to-rail sourcing/sinking topology, delivering ±22 mA short-circuit current and 0.8–1.5 V/µs slew rate under 15 V supply.
Input common-mode range extends from V– to (V+) – 1.9 V at 25°C, with CMRR ≥75 dB and PSRR ≥85 dB (positive rail) across 5–15 V supply range. The device features enhanced latch-up immunity via internal SCR suppression and supports stable operation with capacitive loads when compensated using external pull-up resistors or feedback capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input offset voltage | ±150 μV typical - enables sub-mV DC accuracy in precision transducer amplifiers without trimming |
| Input bias current | 10 fA typical at 25°C - preserves signal integrity in >1 TΩ source impedance circuits (e.g., photodiode preamps) |
| Supply voltage range | 4.5 V to 15.5 V single supply - supports battery-powered portable instrumentation and industrial 12 V systems |
| Output swing | Within 20 mV of V+ and V– at 2 kΩ load - allows full dynamic range utilization in single-supply data acquisition |
| Open-loop gain | 123 dB (400 V/mV) typical - ensures <0.01% gain error in unity-gain buffers and high-precision closed-loop configurations |
| Gain-bandwidth product | 1.3 MHz - supports stable 10× gain up to ~130 kHz in sensor signal chains with minimal phase margin loss |
| Input voltage noise | 22 nV/√Hz at 1 kHz - suitable for low-frequency (<10 kHz) high-resolution measurements where thermal noise dominates |
Pinout & Package
LMC6081AIM/NOPB is housed in an 8-pin SOIC (D package) with standard pinout: Pin 1 (NC), Pin 2 (–IN), Pin 3 (+IN), Pin 4 (V–), Pin 5 (NC), Pin 6 (OUT), Pin 7 (V+), Pin 8 (NC). Three no-connect pins (1, 5, 8) must remain unconnected per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 2 (–IN) | Inverting input | Accepts feedback network connection; high-impedance node requiring guard ring layout to preserve 10 fA bias spec |
| Pin 3 (+IN) | Noninverting input | Direct interface point for high-Z sensors; common-mode range includes V–, enabling ground-referenced inputs |
| Pin 4 (V–) | Negative power supply | Reference for single-supply operation (typically 0 V); supports rail-to-rail input down to V– |
| Pin 6 (OUT) | Amplifier output | Delivers rail-to-rail swing; requires series resistor or pull-up for stable driving of >100 pF capacitive loads |
| Pin 7 (V+) | Positive power supply | Maximum 15.5 V rating; quiescent current 0.45–0.85 mA per amplifier enables low-power portable designs |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Operates within 20 mV of both supply rails into 2 kΩ - maximizes ADC input range in single-supply data loggers |
| Ultra-low input bias current | 10 fA typical at 25°C, ≤4 pA over –40°C to +85°C - maintains accuracy in pH probes and piezoelectric charge amplifiers |
| High open-loop gain | 123 dB (400 V/mV) - ensures <0.005% gain error in 100× instrumentation amplifier stages with matched resistors |
| Single-supply capability | 4.5–15.5 V operation with input common-mode range including V– - eliminates need for dual supplies in portable medical devices |
| Enhanced latch-up immunity | SCR-suppressed CMOS process - prevents destructive latch-up during ESD events or supply sequencing transients |
Applications
| Photodiode Preamp | Medical Biosensor Interface |
|---|---|
Use Scenario: Amplifying weak current from silicon photodiodes in spectrophotometers and pulse oximeters. IC Role / Device Role / Timing Role: Transimpedance amplifier with 10 fA input bias current preserving femtoamp-level signal fidelity. Use Value: Enables detection of sub-nA photocurrents without significant DC error from input bias leakage. |
Use Scenario: Conditioning biopotential signals (ECG, EEG) from dry electrodes with high source impedance. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer with rail-to-rail output and V–-referenced input. Use Value: Maintains >100 dB CMRR while supporting single-supply battery operation and eliminating negative rail generation. |
| Piezoelectric Charge Amplifier | High-Impedance Sample-and-Hold |
Use Scenario: Converting charge output from accelerometers and pressure sensors into proportional voltage. IC Role / Device Role / Timing Role: Integrator with ultra-low input bias current minimizing droop rate in feedback capacitor discharge. Use Value: Achieves <0.1 mV/s droop with 10 nF capacitor, enabling accurate hold times >1 second in data acquisition systems. |
Use Scenario: Capturing and holding analog sensor outputs in low-power IoT edge nodes. IC Role / Device Role / Timing Role: Unity-gain follower with 10 TΩ input resistance preventing charge leakage from hold capacitor. Use Value: Reduces hold capacitor leakage-induced error to <1 μV/s, supporting 16-bit resolution over 100 ms sampling intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMC6061IM/NOPB | Lower quiescent current (14 μA vs 0.75 mA), but higher offset voltage (±250 μV) and lower GBW (100 kHz) | Better suited for micropower battery life-critical designs where speed and DC precision are secondary | Select LMC6061IM/NOPB only when supply current <20 μA is mandatory and 1.3 MHz bandwidth is unnecessary |
| OPA333AIDBVR | Zero-drift architecture (0.02 μV/°C drift), lower noise (17 nV/√Hz), but higher input bias current (200 pA) | Preferred for DC-critical applications like precision references where drift dominates over leakage | Choose OPA333AIDBVR when offset drift <0.1 μV/°C is required and sensor source impedance <100 MΩ |
Compared with LMC6061IM/NOPB and OPA333AIDBVR, the LMC6081AIM/NOPB uniquely balances ultra-low input bias current (10 fA), rail-to-rail output, and 1.3 MHz bandwidth - making it irreplaceable in high-impedance, moderate-speed sensor front-ends where leakage-induced error must be minimized without sacrificing dynamic response.
Availability
LMC6081AIM/NOPB is available at Aetrix Electronics and suitable for medical biosensor interfaces, photodiode-based analytical instruments, and piezoelectric transducer signal conditioning requiring stable component supply across multi-year production cycles.
Supply support for LMC6081AIM/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 heritage in precision op amp design and manufacturing.
The LMC608x family was engineered specifically for ultra-high-impedance, low-leakage signal conditioning - targeting applications where femtoamp-level input bias current and rail-to-rail output performance are non-negotiable.
FAQ
What is the maximum supply voltage for LMC6081AIM/NOPB?
The absolute maximum supply voltage for LMC6081AIM/NOPB is 16 V (single supply), but the recommended operating range is 4.5 V to 15.5 V. Operation above 15.5 V risks reliability degradation, especially when sourcing output current to V+, as noted in TI's datasheet Section 5.1. The LMC6081AIM/NOPB maintains specified performance across its full 4.5–15.5 V range, including rail-to-rail output swing and 10 fA input bias current.
Does LMC6081AIM/NOPB support true rail-to-rail input?
No - the LMC6081AIM/NOPB supports rail-to-rail *output* swing (within 20 mV of V+ and V–), but its input common-mode range extends only to (V+) – 1.9 V and includes V–. This means it accepts inputs down to the negative rail (enabling ground-referenced signals), but not fully to the positive rail. The LMC6081AIM/NOPB is therefore ideal for single-supply systems where the signal stays near V–, such as photodiode current-to-voltage conversion.
Can LMC6081AIM/NOPB drive capacitive loads directly?
The LMC6081AIM/NOPB is not inherently stable with direct capacitive loads >100 pF. As documented in Section 6.1.3, stability requires either a pull-up resistor to V+ (≥500 μA current) or external compensation (e.g., series resistor + feedback capacitor). Uncompensated capacitive loading causes phase-margin loss, leading to overshoot or oscillation. The LMC6081AIM/NOPB datasheet provides specific RC values for 100 pF–1 nF loads in Figure 6-2 and Figure 6-3.
What is the guaranteed input bias current over temperature for LMC6081AIM/NOPB?
Per TI's SNOS630E datasheet Section 5.7, the LMC6081AIM/NOPB guarantees input bias current ≤±4 pA over the full operating temperature range of –40°C to +85°C. At 25°C, typical performance is 10 fA - a 400× improvement over the worst-case max. This specification is critical for charge amplifier and high-impedance transducer applications where bias current directly converts to output offset error.
Is LMC6081AIM/NOPB pin-compatible with other LMC608x variants?
No - the LMC6081AIM/NOPB (single-channel, 8-pin SOIC) has a different pinout than the LMC6082 (dual-channel) and LMC6084 (quad-channel). While all share the same D-package footprint, the LMC6081AIM/NOPB uses Pins 1, 5, and 8 as NC, whereas LMC6082 assigns those pins to channel B inputs and outputs. PCB layout for LMC6081AIM/NOPB cannot be reused for LMC6082 or LMC6084 without redesign.
LMC6081AIM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LMC6081AIM/NOPB FAQ
1.How can I place an order for LMC6081AIM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6081AIM/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 LMC6081AIM/NOPB reliable?
The price and inventory of LMC6081AIM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6081AIM/NOPB is usually 5 days.
3.What payment methods are accepted for LMC6081AIM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6081AIM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6081AIM/NOPB?
LMC6081AIM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6081AIM/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 LMC6081AIM/NOPB?
For technical support, including LMC6081AIM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6081AIM/NOPB requirements.
6.How does Aetrix verify that LMC6081AIM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC6081AIM/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 LMC6081AIM/NOPB meets industry standards.
7.What is the process for return or replacement of LMC6081AIM/NOPB?
All LMC6081AIM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC6081AIM/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 LMC6081AIM/NOPB part is unused and in its original packaging.
Return procedure for LMC6081AIM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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