The OPA818 is a decompensated, voltage-feedback operational amplifier for high-speed and wide-dynamic-range applications. The OPA818 has a low-noise JFET input stage that combines high gain-bandwidth with a wide supply range from 6V to 13V. The fast slew rate (1400V/µs) provides high, large-signal bandwidth and low distortion. This amplifier is manufactured using TI’s proprietary, high-speed, silicon-germanium (SiGe) process to achieve significant performance improvements over other high-speed, FET-input amplifiers.
The OPA818 is an extremely versatile, wideband TIA photodiode amp for use in optical test and communication equipment, and many medical, scientific, and industrial instruments. The OPA818 showcases a 2.7GHz GBWP, low 2.4pF total input capacitance, and 2.2nV/√Hz input noise. The OPA818 achieves over 85MHz signal bandwidth in a TIA configuration with 20kΩ TIA gain (RF) and 0.5pF photodiode capacitance (CD) with wide output swings. The low-noise architecture with picoampere of input bias current is also an excellent choice for test and measurement applications. Though typically stable in gains ≥ 7V/V, the OPA818 is designed for use in applications with lower gains by applying noise-gain shaping techniques.
The OPA818 is available in an 5-pin SOT-23 package and an 8-lead WSON package with an exposed thermal pad for heat dissipation. This device is specified for operation over the industrial temperature range of –40°C to +85°C.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | OPA818 2.7GHz, High-Voltage, FET-Input, Low-Noise, Operational Amplifier datasheet (Rev. B) | PDF | HTML | Dec 9, 2025 |
| Application brief | Biasing an APD With OPA596 | PDF | HTML | Feb 9, 2026 | |
| Product overview | High Speed Amplifiers for In-Vitro Diagnostics (IVD) Analog Front End | PDF | HTML | Apr 10, 2025 | |
| Application note | High Speed ADCs and Amplifiers for Flow Cytometry Applications | Oct 12, 2020 | ||
| Technical article | 3 common questions when designing with high-speed amplifiers | PDF | HTML | Jul 17, 2020 |
For additional terms or required resources, click any title below to view the detail page where available.
The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBV) | 5 | Ultra Librarian |
| WSON (DRG) | 8 | Ultra Librarian |
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