Quad audio op-amp with 30 MHz GBW and 12 V/µs slew rate
The Texas Instruments LME49743MTX/NOPB is a quad-channel audio operational amplifier from the LME® series, packing four amplifiers into a 14-TSSOP package. Its 30 MHz gain-bandwidth product and 12 V/µs slew rate give it the headroom for high-fidelity audio signal chains — think active filters, preamplifiers, and multi-channel mixing consoles where preserving transient detail matters. The supply span of 8 V to 34 V lets it run on common ±15 V rails or a single 24 V rail without a regulator change.
The 8 V minimum supply means it won't start up on a 5 V rail; plan for at least an 8 V rail or a split supply. The 34 V maximum gives margin for unregulated supplies that sag or surge.
Housed in a 14-TSSOP (0.173", 4.40 mm width) with a surface-mount footprint, the LME49743MTX/NOPB is a drop-in for standard quad op-amp layouts. No exposed pad, so thermal management relies on the PCB copper — keep the traces wide and use vias to the ground plane if dissipation is a concern.
Input offset and bias current
For audio paths, 150 µV offset is low enough to avoid audible DC offset in most gain stages, but DC-coupled designs may need a servo or coupling cap. The 190 nA bias is fine for low-impedance sources; high-impedance circuits (like a 10 kΩ source) see a 1.9 mV offset error, which is acceptable for line-level audio.
Output drive and supply current
Each channel can deliver 21 mA output current, enough to drive a 600 Ω headphone load or a line-level transformer. The total supply current is 10 mA for all four channels — 2.5 mA per amplifier — which keeps the thermal budget manageable in a dense board.
The NOPB suffix confirms lead-free, ROHS3-compliant construction.