Dual voltage-feedback amplifier with 55 MHz bandwidth
The LMH6646MM is a dual-channel voltage-feedback op-amp from Texas Instruments, offering a -3 dB bandwidth of 55 MHz and a slew rate of 22 V/µs — these speed parameters suit it for signal conditioning in high-frequency analog front-ends where settling time and phase margin matter. Each channel draws 725 µA supply current, so the total quiescent for both amplifiers is 1.45 mA — low enough for multi-channel designs where the power budget is tight, such as battery-powered instrumentation or multi-zone sensor interfaces. The rail-to-rail push-pull output stage delivers ±20 mA per channel, which drives the input of an ADC or a moderate cable capacitance without external buffer stages.
Supply flexibility and temperature grade
Operating from a single supply span of 2.5 V to 12 V, the LMH6646MM covers both 3.3 V and 5 V logic rails as well as higher-voltage industrial supplies — the wide range means the same BOM position works across multiple board variants without a regulator change. Rated for -40°C to 85°C ambient, the device is specified for industrial environments — control cabinets, outdoor telecom shelters, and factory-floor sensor modules that see seasonal temperature swings. Input offset voltage is 1 mV typical, and input bias current is 650 nA — these DC specs are adequate for precision DC-coupled paths where the signal floor is above a few millivolts; for sub-millivolt sensor front-ends, a CMOS-input amplifier with picoamp bias would be a tighter fit.
Package and lifecycle status
Housed in an 8-VSSOP package (3.00 mm width, 0.118-inch pitch), the LMH6646MM uses the standard MSOP-8 footprint — the same land pattern as many other dual op-amps in this package, so a PCB already routed for a generic MSOP-8 accepts this part without layout changes. The part is marked as RoHS non-compliant, which means it contains lead (Pb) above the exemption threshold — confirm your assembly house's solder profile and the end-market RoHS exemption status before committing the BOM line.