AD8065ARZ vs AD8063AR-REEL7

The AD8065ARZ is a single, high-performance, fast FET-input operational amplifier in an 8-lead SOIC package, featuring a 145 MHz gain bandwidth product and 180 V/µs slew rate. The AD8063AR-REEL7 is a single, low-cost, high-speed amplifier in an 8-lead SOIC package supplied on a 7-inch reel, with a 325 MHz gain bandwidth product and 375 V/µs slew rate, but it is optimized for lower power and cost-sensitive applications. The AD8065ARZ is specified for operation from -40°C to +85°C, while the AD8063AR-REEL7 is specified over the same temperature range but with different supply current and input bias current characteristics.

Yes, both devices are offered in an 8-lead SOIC package with the same pinout: pin 1 is NC, pin 2 is -IN, pin 3 is +IN, pin 4 is -VS, pin 5 is NC, pin 6 is OUT, pin 7 is +VS, and pin 8 is NC. However, pin-compatibility does not guarantee electrical compatibility; the surrounding circuit must be validated for the different bandwidth, slew rate, and supply current specifications.

No, a direct drop-in replacement is not recommended without circuit validation. The AD8063AR-REEL7 has a significantly higher gain bandwidth product (325 MHz vs 145 MHz) and slew rate (375 V/µs vs 180 V/µs), which can affect stability, peaking, and noise performance in an existing AD8065ARZ design. Additionally, the input bias current and supply current specifications differ, so the feedback network and power budget must be re-evaluated.

The AD8065ARZ operates from a single supply of 5 V to 24 V or a dual supply of ±2.5 V to ±12 V. The AD8063AR-REEL7 operates from a single supply of 5 V to 12 V or a dual supply of ±2.5 V to ±6 V. Designs requiring supply voltages above ±6 V or 12 V single-supply must use the AD8065ARZ, as the AD8063AR-REEL7 is not rated for those higher voltages.

The AD8065ARZ is a FET-input amplifier with a typical input bias current of 2 pA at 25°C, making it suitable for high-impedance sensor interfaces and photodiode transimpedance amplifiers. The AD8063AR-REEL7 has a typical input bias current of 1.5 µA at 25°C, which is several orders of magnitude higher and can cause significant offset errors in high-impedance circuits. For applications requiring very low input bias current, the AD8065ARZ is the appropriate choice.

The AD8065ARZ typically draws 6.4 mA of quiescent supply current per amplifier at 25°C. The AD8063AR-REEL7 typically draws 6.8 mA of quiescent supply current at 25°C. While the difference is small, the AD8063AR-REEL7 is generally positioned as a lower-cost alternative rather than a lower-power alternative, so power-sensitive designs should compare the full supply current versus bandwidth trade-off.

The AD8063AR-REEL7 offers a higher gain bandwidth product of 325 MHz and a slew rate of 375 V/µs, making it better suited for very high-speed signal conditioning where wider closed-loop bandwidth and faster large-signal response are required. The AD8065ARZ, with 145 MHz gain bandwidth and 180 V/µs slew rate, is better suited for precision high-speed applications that prioritize low input bias current and lower noise over maximum bandwidth.

Both devices are supplied in an 8-lead SOIC package. The AD8065ARZ is typically supplied in tube or tray quantities for prototype and production use. The AD8063AR-REEL7 is supplied on a 7-inch tape-and-reel with 750 units per reel, which is intended for automated surface-mount assembly. The "-REEL7" suffix indicates the tape-and-reel packaging option and does not indicate a different silicon die or performance grade.