The OP191/OP291/OP491 are single-supply, rail-to-rail input/output operational amplifiers from Analog Devices (ADI) that feature a single-supply operation range of 2.7 V to 12 V, wide input voltage range, rail-to-rail output swing, low supply current, wide bandwidth, low distortion, low drift, etc., and are suitable for applications such as industrial process control, battery-powered instrumentation, power supply control and protection, telecommunications, remote sensors, low voltage strain gage amplifiers, DAC output amplifiers, etc.
The OP191, OP291, and OP491 are micropower, single‑supply operational amplifiers with rail‑to‑rail input and output. They operate from 2.7 V to 12 V, offer a 3 MHz bandwidth, and consume as little as 300 pA supply current.
The document includes detailed electrical specifications, absolute maximum ratings, thermal resistance data, typical performance curves, and an ordering guide that lists the available SOIC, PDIP, and TSSOP packages for each part number.
| Supply voltage range | 2.7 V to 12 V |
|---|---|
| Bandwidth | 3 MHz |
| Supply current | 300 pA per amp |
| Input offset voltage | 700 pV |
| Operating temperature range | -40 °C to +125 °C |
They operate from a single supply of 2.7 V up to 12 V.
The devices have a low supply current of about 300 pA per amp.
They are specified for industrial temperatures from –40 °C to +125 °C.
OP191 (single) and OP291 (dual) are offered in 8‑lead SOIC packages; OP491 (quad) is available in 14‑lead PDIP, 14‑lead SOIC, and 14‑lead TSSOP packages.