What this filter does that a simple RC can't
The MAX7404CSA+ is an 8th-order elliptic low-pass switched-capacitor filter from Maxim Integrated. Its elliptic (Cauer) topology gives you a much steeper roll-off than a Butterworth or Bessel of the same order — useful when you need to kill out-of-band noise close to the passband edge without cascading multiple op-amp stages.
Where you'd reach for this part
A single-supply 8th-order filter in an SOIC-8 is a natural fit for anti-aliasing before a 16-bit or 24-bit ADC sampling below 10 kHz, or for reconstruction after a DAC in an audio or instrumentation path. The elliptic response means you get a narrow transition band — the stopband attenuation climbs fast — but expect some passband ripple and stopband ripple as the trade-off. If your signal chain can tolerate that ripple, this filter saves board area and BOM count versus a multi-stage active filter.
Supply rail and voltage — the gotcha
Do not try to power it from 5 V or from a 2.5 V rail — it's not rated for either. If your board has a 3.3 V analog supply, this filter drops right in. The single 8-SOIC package is easy to hand-solder or rework, and the tube shipping format is fine for prototyping or low-volume production.
Maxim lists the MAX7404CSA+ as Active. For a repair bench or a new design, this is a straightforward part to source — no last-time-buy scramble.