This amplifier has ultralow offset, drift, and bias current. The RS8547/RS8548 are wide bandwidth auto-zero amplifiers featuring rail-to-rail input and output swing and low noise. Operation is fully specified from 2.5 V to 5.5 V single supply (±1.25 V to ±2.75 V dual supply). The RS8547/RS8548 provide benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using topology, these zero-drift amplifiers combine low cost with high accuracy and low noise. No external capacitor is required. In addition, the RS8547/RS8548 greatly reduce the digital switching noise found in most chopper-stabilized amplifiers. With an offset voltage of 1 µV, drift of 0.1 μV/°C, and noise of only 0.55 µV p-p (0.1 Hz to 10 Hz), the RS8547/RS8548 are suited for applications where error sources cannot be tolerated. Position and pressure sensors, medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature range. Many systems can take advantage of the rail-to-rail input and output swings provided by the RS8547/RS8548 to reduce input biasing complexity and maximize SNR. The RS8547/RS8548 are specified for the extended industrial temperature range (−40°C to +125°C). The RS8547 is available in 5-lead SOT23 plastic packages. The RS8548 is available in the standard 8-lead narrow SOP and MSOP plastic packages.