The OP12GJ from Precision Monolithics is a single-channel general-purpose operational amplifier in a TO-99-8 metal can package. It operates over the full military temperature range of -55°C to 125°C and is rated for a supply span of 40 V. With an input bias current of 3 nA and an input offset voltage of 350 µV, this part is suited for precision analog signal conditioning in environments where temperature extremes and supply headroom matter — avionics, missile guidance, satellite telemetry, or downhole instrumentation.
40 V supply span and military temperature range
The 40 V supply span (single or split) gives the OP12GJ the headroom to handle large input common-mode swings and deliver a wide output swing without clipping. That matters when the signal chain runs on unregulated rails or needs to accommodate sensor outputs that ride on a high DC offset. The -55°C to 125°C temperature range is the full military spec — not a derated commercial grade. If your BOM calls for a part that holds its offset and bias over a missile-guidance thermal cycle or a satellite's vacuum-side temperature swing, this is the tier.
DC precision: input bias and offset
Input bias current of 3 nA and input offset voltage of 350 µV are the numbers a calibration technician checks first. For a general-purpose op-amp in a TO-99 can, these are respectable — not the lowest in the catalog, but well within what a precision integrator or a low-level transducer amplifier needs. If you are verifying a measurement chain against a traceable standard, the offset drift over temperature (not stated here) is the next thing to qualify; the room-temperature offset alone does not guarantee long-term stability.
Package and mounting: TO-99 metal can
The TO-99-8 metal can is a hermetic package — a sealed metal enclosure that keeps moisture and contaminants out. That is why it shows up in high-reliability and defense programs. Through-hole mounting means it goes into a PCB socket or is soldered into plated through-holes; no reflow profile to manage, but the board layout needs the hole pattern and keep-out zone for the can diameter. The supplier device package is listed as TO-99, which is the standard 8-lead round metal can. Bulk packaging — no tape-and-reel, so plan for manual or tube-fed insertion.
Lifecycle and compliance
The OP12GJ is listed as Active in production status. The RoHS status is non-compliant, which is expected for a military-grade hermetic metal can part.