The OP-41 JFET-input op amp features a 5pA max bias current with an open-loop gain of over 1 million. 77° of phase margin provides exceptional stability, even in unity-gain with capacitive loads. The output is guaranteed stable with 250pF loads at unity-gain, and will typically drive several thousand pF. Transient responsible is extremely clean, and is considerably improved over industry-standard JFET amplifiers.