AD515A is a monolithic FET-input operational amplifier with a guaranteed maximum input bias current of 75 fA (AD515AL). The AD515A is a monolithic successor to the industry standard AD515 electrometer, and will replace the AD515 in most applications. The AD515A also delivers laser-trimmed offset voltage, low drift, low noise and low power, a combination of features not previously available in ultralow bias current circuits. All devices are internally compensated, protected against latch-up and are short circuit protected. The AD515A is typically used for sensor and instrumentation measurement, ohmmeter, divider, voltage reference, DC voltage measurement and current sensor applications. The AD515A can be used to measure small currents or voltages from high impedance resistors or capacitors.