Analog Devices AD820AR-3V, single JFET op-amp, 1.9 MHz gain bandwidth, 3 V/µs slew rate, rail-to-rail output, 700 µA supply, 8-SOIC package, -40°C to 85°C.
| Parameter | Value |
|---|---|
| Output type | Rail-to-Rail |
| Mounting | Surface Mount |
| Amplifier type | J-FET |
| Voltage - input offset | 400 µV |
| Voltage - supply span | 36 V |
| Current - supply | 700µA |
| Current - input bias | 2 pA |
| Current - output (Channel) | 20 mA |
| Operating temperature | -40°C ~ 85°C |
| Gain bandwidth product | 1.9 MHz |
| Package | Bulk |
| Slew rate | 3V/µs |
| Case | 8-SOIC (0.154\", 3.90mm Width) |
| Number of circuits | 1 |
The JFET front end keeps input bias current at 2 pA, so it works directly with high-impedance sources such as photodiodes or pH probes without adding offset drift. The rail-to-rail output swings close to both supply rails, maximizing dynamic range in low-voltage systems.
The 8-SOIC package is surface-mount, so it reflows on a standard profile and fits a compact PCB layout.
The closest functional equivalent is the AD820ARZ-REEL — same JFET op-amp, same 1.9 MHz GBW, same 3 V/µs slew rate, same 8-SOIC footprint, but RoHS-compliant and supplied in tape-and-reel. If you need a higher-speed JFET op-amp, the AD8627 (5 MHz, 5 V/µs) is a pin-compatible alternative in 8-SOIC.
The slew rate is 3 V/µs, typical for a 1.9 MHz JFET op-amp. That means it can reproduce a 1 V peak-to-peak sine wave cleanly up to about 480 kHz — fine for audio, sensor filtering, and control loops.
Yes, the output stage is rail-to-rail, meaning it can swing within millivolts of both supply rails. This is useful in single-supply designs (e.g., 5 V only) where you need the full voltage range into an ADC or comparator.