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 | |
| 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.
The amplifier performance development kit (PDK) is an evaluation module (EVM) kit to test common operational amplifier (op amp) parameters and is compatible with most op amps and comparators. The EVM kit offers a main board with several socketed daughtercard options to fit package needs, allowing (...)
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOIC (D) | 14 | Ultra Librarian |
| SOT-23-THN (DYY) | 14 | Ultra Librarian |
| X2QFN (RUC) | 14 | Ultra Librarian |
| TSSOP (PW) | 14 | Ultra Librarian |
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