The OPAx991 family (OPA991, OPA2991, and OPA4991) is a family of high voltage (40 V) general purpose operational amplifiers. These devices offer exceptional DC precision and AC performance, including rail-to-rail input/output, low offset (±125 µV, typical), low offset drift (±0.3 µV/°C, typical), low noise (10.5 nV/√Hz and 1.8 µVPP), and 4.5-MHz bandwidth.
Unique features such as differential and common-mode input-voltage range to the supply rail, high output current (±75 mA), high slew rate (21 V/µs), high capacitive load drive (1 nF), and shutdown functionality make the OPAx991 a robust, high-performance operational amplifier for high-voltage industrial applications.
The OPAx991 family of op amps is available in micro-size packages (such as X2QFN and WSON), as well as standard packages (such as SOT-23, SOIC, and TSSOP), and is specified from –40°C to 125°C.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | OPAx991 40-V Rail-to-Rail Input/Output, Low Offset Voltage, Low Noise Op Amp datasheet (Rev. F) | PDF | HTML | Jan 4, 2022 |
| Application note | Full Power Bandwidth and Op Amp Distortion | PDF | HTML | May 14, 2026 | |
| Application note | Ramping Up on Slew Rate (Rev. A) | PDF | HTML | Sep 25, 2024 | |
| Product overview | PLC Analog Input Front-End Architectures | PDF | HTML | Jul 31, 2022 | |
| Application brief | Using An Op Amp for High-Side Current Sensing (Rev. A) | PDF | HTML | Dec 7, 2021 | |
| Third party document | Programmable analog output circuit maximizes industrial system flexibility | Feb 1, 2021 |
For additional terms or required resources, click any title below to view the detail page where available.
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-SC70 (DCK) | 5 | Ultra Librarian |
| SOT-23 (DBV) | 6 | Ultra Librarian |
| SOT-23 (DBV) | 5 | Ultra Librarian |
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