Four J-FET amplifiers in a 14-SOIC — 560 µA per channel, rail-to-rail output
The AD824ARZ-14-REEL from Analog Devices packs four J-FET input amplifiers into a single 14-SOIC package, each channel drawing 560 µA of supply current. With a gain-bandwidth product of 2 MHz and a 2 V/µs slew rate, this part is sized for precision signal conditioning in multi-channel data acquisition, sensor front-ends, and active filter banks where you need low bias current and moderate bandwidth across four channels.
The 3 V minimum supply span means this quad op-amp can run directly off a single lithium cell or a 3.3 V regulated rail, while the 30 V maximum covers 24 V industrial buses without an extra regulator.
Input bias and offset — J-FET advantage for high-impedance sources
The J-FET input stage delivers a typical input bias current of 4 pA and an input offset voltage of 500 µV. That low bias current is the main reason to pick this part over a bipolar-input quad op-amp: it won't load down a high-impedance sensor output (pH probe, photodiode, piezoelectric accelerometer) or force you to add a buffer stage. The 12 mA output current per channel is enough to drive an ADC input or a modest cable capacitance.