The NEC UPC4570C-A is a dual-channel audio operational amplifier in an 8-pin DIP package, designed for line-level audio signal conditioning in industrial and consumer equipment. Its 15 MHz gain-bandwidth product and 7 V/µs slew rate provide enough headroom for audio-band filtering, pre-amplification, and active crossover networks without pushing the distortion knee into the audible range. The dual-channel configuration in a single DIP-8 saves board area for stereo paths or dual-stage filters.
The 15 MHz gain-bandwidth product means the amplifier maintains a closed-loop gain of 10 up to about 1.5 MHz, well beyond the 20 kHz audio band, so gain accuracy and phase margin hold flat across the audible spectrum. The 7 V/µs slew rate supports a full 20 V peak-to-peak output swing at 20 kHz without slew-induced distortion — a common requirement for line-level audio signals in pre-amp stages. For comparison, a general-purpose op-amp with 3 V/µs would start to round the waveform at that amplitude and frequency, adding harmonic content. The 100 nA input bias current and 300 µV input offset voltage are typical for a bipolar-input audio op-amp; they are low enough that DC offset at the output stays under a few millivolts with reasonable source impedance, but not so low that the part competes with precision FET-input amplifiers for instrumentation roles.
Through-hole DIP-8 — assembly and rework considerations
The 8-DIP (0.300" row spacing, 7.62 mm body width) is a through-hole package suited for prototyping, low-volume production, and field repair where wave soldering or hand-soldering is the norm. No moisture sensitivity level concern — DIP packages are not moisture-sensitive, so no bake-out is required before assembly regardless of storage conditions. The 10 mA per-channel output current is adequate to drive a typical 10 kΩ load to nearly the rail; for driving headphones or long cables, a buffer stage is advisable. The package footprint is standard, and the through-hole leads are robust for repeated insertion and removal during development.
The through-hole DIP package also means the part is widely inventoried across independent distribution channels, so supply continuity is straightforward to maintain through standard procurement routes.