Description:

Lot of 2x OP27EJ precision operational amplifiers in TO-99 metal can package. Marked PMI/Analog Devices, NOS/vintage stock with Korea manufacture and 1989 date code per markings. OP27 is a well-known precision, low-offset, low-drift, low-noise op-amp commonly used in instrumentation and DC-accuracy signal conditioning where stability matters. Parts are sold as shown.

Modern uses:

- Precision sensor amplification (strain gauge, bridge sensors, thermocouples with proper front-end design)

- Low-offset DC amplification and buffering

- Instrumentation / data acquisition front-ends (after verifying supply requirements)

- Active filters and precision references/servo loops in lab/industrial equipment

- Repair/restoration of vintage test gear and professional audio/measurement hardware

Compatibility note:

Verify your circuit requirements before purchase: confirm TO-99 pinout/orientation, supply voltage range, and stability/compensation needs versus your design. If substituting for a modern op-amp, check input offset/drift specs, input bias current, noise, and output swing/current limits. Measure/inspect parts on receipt if your application is critical (NOS/vintage stock).