Quad op-amp with 125 MHz bandwidth and rail-to-rail output
The AD8040ARU: The 14-TSSOP package keeps board area tight for multi-channel designs.
The 63 V/µs slew rate supports full-power bandwidth into the low-MHz range without slew-induced distortion.
Supply current and output drive — power budget reality
Each amplifier draws 1.4 mA quiescent, so the full quad package consumes 5.6 mA idle — modest for a 125 MHz part, but not micropower. The 170 mA per-channel output current is unusually high for a general-purpose op-amp; if you need to drive a 32 Ω headphone or a long cable, this part can do it without an external buffer. However, at 170 mA per channel on all four amplifiers, total package dissipation can exceed 800 mW — the 14-TSSOP's thermal resistance (about 150 °C/W) means the junction can hit 125 °C at 5.6 mA idle plus moderate output current. A thermal pad or airflow is advisable for sustained high-current operation.
The 125°C upper limit is the junction temperature — derating applies above 85°C ambient if output current is high.
Second-source and cross-reference
The AD8040ARU has no official second-source from another manufacturer. The AD8030ARJZ-REEL7 is a dual-channel variant (2 circuits instead of 4) in a smaller SOT-23 package, useful if only two amplifiers are needed and board space is tight.