The OPA838 decompensated voltage-feedback operational amplifier provides a high, 300MHz gain bandwidth product with 1.8nV/√Hz input noise voltage, requiring only a trimmed 0.95mA supply current. These features combine to provide an extremely power-efficient device for photodiode transimpedance designs and high-voltage gain stages, which require the lowest input voltage noise in signal receiver applications.
Operating at the minimum recommended noninverting gain of 6V/V results in a 90MHz, –3dB bandwidth. Extremely low input noise and offset voltage make the OPA838 an excellent choice for high gains. Even at a dc-coupled gain of 1000V/V, a 300kHz signal bandwidth is available with a maximum output offset voltage of ±125mV.
The single-channel OPA838 is available in 6-pin SOT-23, 6-pin SC70, and 8-pin X2QFN packages, all with a power shutdown feature. The OPA838 is also available in a 5-pin SC70 package.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | OPA838 1mA, 300MHz Gain Bandwidth, Voltage-Feedback Op Amp datasheet (Rev. E) | PDF | HTML | Aug 6, 2025 |
| Technical article | 3 common questions when designing with high-speed amplifiers | PDF | HTML | Jul 17, 2020 | |
| Application brief | Higher accuracy using an external amplifier in ultrasonic flow measurement | Feb 5, 2019 |
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |
| SOT-SC70 (DCK) | 5 | Ultra Librarian |
| X2QFN (DXB) | 8 | Ultra Librarian |
| SOT-SC70 (DCK) | 6 | Ultra Librarian |
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