Dual CMOS op-amp with rail-to-rail output in 8-SOIC
The OPA2743UA is a dual CMOS operational amplifier from Texas Instruments, offering a gain-bandwidth product of 7 MHz and a slew rate of 10 V/µs. Its rail-to-rail output stage swings within millivolts of both supply rails, maximizing dynamic range in single-supply or low-voltage systems where every millivolt of headroom counts. The supply span runs from 3.5 V minimum to 12 V maximum, covering common 3.3 V, 5 V, and 12 V rails without needing a separate regulator.
Where the ratings matter for the BOM
With a 7 MHz gain-bandwidth product, the OPA2743UA supports signal bandwidths up to roughly 700 kHz at a closed-loop gain of 10 — fast enough for sensor conditioning, audio paths, and control-loop feedback in motor-drive or PLC analog input stages. The 10 V/µs slew rate means the output can swing 10 V in one microsecond, so a 5 V peak-to-peak sine wave at 300 kHz reproduces without slew-induced distortion — useful for high-speed data converter drive or filter stages. Input bias current is 1 pA typical, which keeps the voltage error across a 10 kΩ source resistor below 10 nV — negligible for most precision circuits, though the offset voltage of 1.5 mV is the dominant DC error term to budget. Each channel draws 1.1 mA quiescent supply current, totaling 2.2 mA for the dual package — a reasonable power budget for a multi-channel analog front-end on a 24 VDC industrial supply.
Package, temperature grade, and compliance
Housed in the standard 8-SOIC (0.154", 3.90 mm width) surface-mount package, the OPA2743UA fits the common SOIC-8 footprint used across TI's op-amp portfolio — no board spin needed if migrating from a similar dual op-amp in the same package. Rated for the industrial temperature range of -40°C to 85°C, it suits factory-floor enclosures, outdoor telecom cabinets, and under-hood automotive modules that see ambient heat but not the full 125°C of AEC-grade parts.