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.
Package and footprint
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
Input offset voltage is 150 µV typical, and input bias current is 190 nA. 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.
Lifecycle and compliance
The NOPB suffix confirms lead-free, ROHS3-compliant construction.