Precision op amp in a hermetic can
The through-hole, hermetically sealed TO-99 package is a differentiator: it offers better moisture resistance and thermal stability than plastic DIP or SOIC, which matters in high-reliability or long-life applications.
The 0.3 V/µs slew rate places the AD707AH firmly in the precision camp, not the high-speed one. For a 10 V output step, the settling time is roughly 33 µs — fine for DC or low-frequency AC (< 20 kHz full-power bandwidth), but not for fast ADC drivers or video buffers. The 30 µV input offset, however, is the headline precision metric: it keeps DC errors low without external trimming, which simplifies the BOM in weigh-scale, thermocouple, or strain-gauge circuits. The 2 nA input bias current (typical) is moderate — JFET-input competitors offer picoamp bias, but the AD707AH's bipolar front end delivers lower voltage noise density at low frequencies.
TO-99-8 — footprint and handling
The TO-99-8 metal can is an 8-lead, circular, through-hole package with a 0.200-inch (5.08 mm) pin circle diameter. It is not compatible with DIP-8 layouts — the pin circle is smaller and the leads are arranged radially. The metal case is internally connected to the negative supply (V–) on most ADI op amps in this package; verify against your schematic to avoid inadvertent shorts. The hermetic seal means no moisture-sensitivity level (MSL) bake requirement, a plus for rework or low-volume assembly. The metal can also provides some RF shielding benefit, though it is not specified as a shielded part.