0.3 pA input bias — the spec that defines this part
The AD515JH is a single-channel general-purpose op-amp from Analog Devices, packaged in a TO-99-8 metal can for through-hole mounting. Its headline feature is the 0.3 pA typical input bias current, which places it in the electrometer-grade class — orders of magnitude lower than a jellybean bipolar op-amp. This makes the part a natural fit for photodiode front-ends, pH probe amplifiers, and any high-impedance sensor interface where bias current error would swamp the signal.
The gain-bandwidth product of 350 kHz and slew rate of 1 V/µs indicate a low-frequency precision amplifier. The 400 µV input offset voltage is typical for a FET-input part at this tier.
The AD515JH operates from a total supply span of 10 V to 36 V. The 800 µA supply current is moderate for a FET-input part.
TO-99-8 metal can — package reality
The TO-99-8 metal can is a hermetic package, which historically gave this part an edge in humid or condensing environments where plastic packages can absorb moisture. It is a through-hole package, so it requires a drilled PCB or a socket. The metal can also provides some RF shielding, though at these frequencies it is rarely the deciding factor. The listed shipping form is Bulk, meaning loose parts in an antistatic bag — not Tape & Reel, so pick-and-place assembly needs a tube feeder or manual placement.