LMC6681BIN Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The LMC6681BIN is a single rail-to-rail input and output CMOS operational amplifier from Texas Instruments, featuring ultra-low bias current of 80fA maximum for high-impedance sensor interfaces. It delivers 82dB typical common-mode rejection ratio, voltage-feedback architecture, and operates from a single 2.7V to 16V supply in an 8-pin DIP package. Ideal for precision photodetector amplifiers, pH meters, and electrometer-grade measurement instruments.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- LMC6681BIN Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Ultra-low input bias current of 80 fA maximum for high-impedance sensor interfaces
- Rail-to-rail input and output for maximum signal swing in low-voltage systems
- Single supply operation from 2.7V to 16V for flexible power configurations
- 82 dB typical common-mode rejection ratio for high signal integrity
- Voltage-feedback architecture with frequency compensation for stable closed-loop operation
- 8-pin DIP package for easy prototyping and through-hole circuit assembly
Applications
The LMC6681BIN is ideal for electrometer-grade applications such as photodiode current amplifiers, ion-selective electrode interfaces, and pH measurement systems where extremely low input bias current is critical to avoid loading the high-impedance source. It is used in precision scientific instrumentation, medical analysis equipment, and environmental sensors that require accurate measurement of picoampere-level currents. Its rail-to-rail output capability also makes it suitable for low-voltage battery-powered sensor conditioning in portable field measurement tools.
Specifications
| YTEOL | 0 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | VOLTAGE-FEEDBACK |
| Average Bias Current-Max (IIB) | 0.00002 µA |
| Bias Current-Max (IIB) @25C | 8e-8 µA |
| Common-mode Reject Ratio-Min | 60dB |
| Common-mode Reject Ratio-Nom | 82dB |
| Frequency Compensation | YES |
| Input Offset Voltage-Max | 7800 µV |
| JESD-30 Code | R-PDIP-T8 |
| Low-Bias | YES |
| Low-Offset | NO |
| Micropower | NO |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power | NO |
| Programmable Power | NO |
| Supply Current-Max | 1.32mA |
| Supply Voltage Limit-Max | 12V |
| Supply Voltage-Nom (Vsup) | 2.2V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Unity Gain BW-Nom | 1200 |
| Wideband | NO |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the input bias current of the LMC6681BIN?
The LMC6681BIN has an ultra-low typical input bias current of approximately 80 fA (femtoamperes) at 25°C, with a maximum of 20 pA average. This extremely low bias current makes it ideal for interfacing with high-impedance sources such as photodiodes, ion-selective electrodes, and pH sensors without corrupting the measurement signal.
Does the LMC6681BIN have rail-to-rail inputs and outputs?
Yes, the LMC6681BIN features both rail-to-rail input common-mode range and rail-to-rail output swing. Rail-to-rail inputs allow the common-mode voltage to extend from the negative supply to the positive supply rail, enabling use as a unity-gain buffer for signals at or near the supply rails. Rail-to-rail output maximizes the output dynamic range in low-voltage supply systems.
What supply voltage does the LMC6681BIN require?
The LMC6681BIN operates from a single supply voltage ranging from 2.7V to 16V, or equivalently from a dual supply of ±1.35V to ±8V. This wide range accommodates both low-voltage battery-powered designs at 3.3V or 5V and higher-voltage industrial measurement instruments requiring up to ±8V supplies.
What package is the LMC6681BIN available in?
The LMC6681BIN is housed in an 8-pin PDIP (Plastic Dual In-line Package) with 2.54mm pin pitch, making it ideal for through-hole PCB assembly, breadboard prototyping, and socket-based evaluation circuits. The DIP-8 package is widely available and compatible with all standard through-hole PCB manufacturing processes.
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Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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