Quad op-amp for multi-channel signal chains on a tight power budget
The Analog Devices LT1639CS#PBF is a quad general-purpose operational amplifier with rail-to-rail output swing, packaged in a 14-SOIC. The four amplifiers together draw 205 µA total supply current, which breaks down to roughly 51 µA per channel — a strong fit for multi-channel sensor interfaces, battery-monitoring front-ends, and low-power active filters where every microamp counts. The 40 mA output current per channel can drive moderate loads like ADC inputs, reference buffers, or small relays through a transistor stage. Input offset voltage is specified at 350 µV, and input bias current at 20 nA — adequate for general-purpose precision work without reaching into zero-drift territory.
The 14-SOIC package is a common footprint with broad second-source availability for the package itself, though a direct pin-compatible alternate from another manufacturer would need to match the 2.5 V to 44 V supply range and the quad rail-to-rail output topology.
The 2.5 V minimum supply lets this op-amp run directly from a single lithium cell or a 3.3 V rail with headroom to spare. The 44 V maximum covers 24 V industrial systems with margin for transients.