Quad op-amp in a compact TSSOP-14 for multi-channel signal chains
The MAX4492AUD+ from Analog Devices (formerly Maxim Integrated) is a quad general-purpose op-amp packing four independent amplifiers into a 14-TSSOP package measuring 4.40 mm wide. Input bias current is a CMOS-grade 50 pA, which keeps offset errors negligible when working with high-impedance sources like photodiodes or pH probes. Total quiescent current for all four amplifiers is 800 µA — 200 µA per channel — which keeps the thermal budget manageable in the TSSOP package and makes this a viable choice for multi-channel battery-powered instruments.
10 MHz GBW and 10V/µs slew rate — what they mean for filter and buffer designs
With a 10 MHz gain-bandwidth product, this op-amp supports closed-loop gains up to 10 at 1 MHz before the open-loop gain drops to unity. The 10V/µs slew rate means a 5 V peak-to-peak output step settles in about 500 ns, which is fast enough for 12-bit data acquisition systems sampling at a few hundred kHz. For audio-frequency active filters (20 Hz–20 kHz), the gain-bandwidth margin is generous — expect less than 0.1 dB passband ripple with multiple-pole Sallen-Key or multiple-feedback topologies. The 50 mA output current per channel can drive moderate loads like a 100 Ω resistor to 5 V, or directly feed the input of a successive-approximation ADC's sample-and-hold capacitor. If you need to drive a heavier load (e.g., 32 Ω headphones or a long twisted-pair cable), plan on an external buffer stage.
Expect the 1.5 mV input offset voltage to drift by a few hundred microvolts across the temperature span; the 50 pA input bias current will double roughly every 10°C, so at 125°C it may reach a few nanoamperes — still acceptable for most general-purpose circuits but worth noting for precision DC-coupled paths.
For production programs that need multi-year supply continuity, this part does not carry the obsolescence risk that NRND or EOL parts do.