CMOS quad op-amp with femtoamp input bias
The LMC6064AIMX/NOPB is a quad CMOS operational amplifier from the TI LMC® series, packing four rail-to-rail output stages into a 14-SOIC package. Its 0.01 pA typical input bias current is the standout spec — that is 10 fA, a level that makes the amplifier essentially invisible to high-impedance sources like pH probes, photodiode front-ends, or piezoelectric sensors where a standard bipolar op-amp's nanoamp bias would swamp the signal. The 100 kHz gain-bandwidth product and 0.035 V/µs slew rate place this part squarely in the low-frequency precision domain — think thermocouple conditioning, strain-gauge bridges, or battery-monitoring loops where the signal changes slowly and the priority is DC accuracy, not speed. The 80 µA per-channel supply current (320 µA total for all four) keeps the thermal budget negligible in a dense board.
Supply rails, offset, and output drive
Operates from a single supply as low as 4.5 V up to 15.5 V, or split supplies down to ±2.25 V. The rail-to-rail output swings within 10 mV of each rail at light loads, preserving dynamic range in low-voltage single-supply designs. Input offset voltage is trimmed to 100 µV typical — no external nulling pot needed for most 12-bit acquisition chains. Each output can source or sink 26 mA, enough to drive a reference input, a small relay coil, or a 2 kΩ load to the rail. The CMOS input stage's 0.01 pA bias means source impedance can be in the megaohm range without introducing a voltage error from bias current — a 10 MΩ source sees just 0.1 µV of offset from bias alone. Rated across the industrial temperature range of -40°C to 85°C junction, it fits outdoor telecom enclosures, engine-bay electronics, and factory-floor sensor interfaces. The 14-SOIC footprint is a standard 3.90 mm-wide body, 1.27 mm pitch — a two-layer board can route all four channels with a single ground plane.
Active production and sourcing posture
The LMC® series is a long-running precision CMOS family, and this quad variant in the 14-SOIC tape-and-reel format is a standard catalog item. Sourced to order against your BOM quantity through independent and authorized distribution channels. The tape-and-reel packaging (cut tape also available) suits both prototype builds and production reels.