The AD8009 is a current-feedback amplifier (CFA) from Analog Devices aimed at one job: moving a signal fast and cleanly. With a 1 GHz small-signal bandwidth at unity gain and a 5500 V/µs slew rate, it sits at the top end of ADI's high-speed amplifier line. AD8009ARZ-REEL7 is the RoHS-compliant ("Z"), tape-and-reel ("REEL7") version in the 8-Lead SOIC (R-8) package.

The reason a designer reaches for a current-feedback topology here is the relationship between gain and bandwidth. In a conventional voltage-feedback amplifier the gain-bandwidth product is fixed, so raising the gain throws away bandwidth proportionally. A CFA breaks that link: bandwidth is set largely by the feedback resistor R_F, not by the closed-loop gain. The AD8009 holds 1000 MHz at G = +1, still 700 MHz at G = +2 and 320 MHz at G = +10 - far more usable bandwidth at higher gains than a comparable VFA would keep. The trade is that R_F becomes a tuning element (ADI specifies the optimum, around 301 Ω at G = +1), not a free choice.

Around that core the AD8009 delivers a 5500 V/µs slew rate and 10 ns settling to 0.1%, so large fast steps and pulses come through without slew-rate distortion, and the part is characterized for low harmonic distortion in the IF/RF range. It runs from ±5 V (or a single +5 V rail), draws about 14 mA quiescent, and the output stage sources a healthy 175 mA short-circuit current to drive back-terminated cables and low-impedance loads. The 8-Lead SOIC keeps it on any standard board.

Note: Values are taken from the Analog Devices AD8009 datasheet. Confirm every parameter against the latest official documentation before committing a design.

AD8009ARZ-REEL7 is supplied in the 8-Lead SOIC (ADI outline R-8), the standard 3.9 mm-body small-outline IC with 1.27 mm lead pitch. The "Z" in the part number marks the RoHS-compliant lead-free finish and "REEL7" the 7-inch tape-and-reel packing. The same AD8009 die is also offered in a 5-Lead SOT-23 (RT-5) for the smallest footprint. At 1 GHz the package and board matter: keep the SOIC's ground and supply pins tightly decoupled and the feedback loop short, so the layout does not become the bandwidth limit. Package dimensions and pin-1 orientation are shown below.

📄 Full specifications are detailed in the official Analog Devices AD8009 datasheet.

The 8-Lead SOIC uses the classic single-amplifier pinout; the three NC pins around the package edges help isolate the high-speed signal pins:

• Pin 1 - NC: No connect; leave unconnected.
• Pin 2 - -IN: Inverting input. In a CFA this is the low-impedance current-summing node - keep its trace short and clean.
• Pin 3 - +IN: Non-inverting (high-impedance) input.
• Pin 4 - -VS: Negative supply (-5 V, or ground in single-supply use); decouple close to the pin.
• Pin 5 - NC: No connect.
• Pin 6 - OUT: Amplifier output, sourcing up to 175 mA.
• Pin 7 - +VS: Positive supply (+5 V); decouple close to the pin.
• Pin 8 - NC: No connect.

Refer to the package drawing below for the physical pin numbering of the 8-Lead SOIC.

The parts below are ADI high-speed amplifiers near the AD8009. They are not drop-in replacements; verify topology, bandwidth, feedback-resistor requirement and pinout before substituting.

Selection Tips: Stay with the AD8009 when you need 1 GHz-class speed with high slew rate and the gain flexibility of a current-feedback amplifier. For two matched channels, step to the dual AD8002 or AD8056; choose AD8011 when supply current must drop to the milliamp class. If the design prefers voltage-feedback behavior with no critical feedback resistor, the AD8055 (single) or AD8056 (dual) is the better fit despite the gain-bandwidth trade.

Analog Devices, Inc. (ADI), headquartered in Wilmington, Massachusetts, USA, is a global leader in high-performance analog, mixed-signal and RF semiconductors, and the long-standing reference name in high-speed amplifiers. The AD8009 sits in ADI's high-speed current-feedback amplifier portfolio, a line developed over decades of leadership in fast signal-chain design.

ADI backs the AD8009 with full datasheet characterization, evaluation boards, SPICE models and application notes on current-feedback layout and stability - support that matters at gigahertz speeds, where the difference between datasheet and bench performance is largely a matter of applying the manufacturer's layout guidance.