Dual-supply SPST switch — what it is and where it fits
The Maxim Integrated MAX321EUA is a dual-supply, single-pole single-throw (SPST) analog switch designed for signal routing in precision analog and mixed-signal chains. It handles bipolar signals with dual supply rails, making it suitable for audio path switching, multiplexing in data-acquisition front-ends, and test-equipment signal routing where a clean break-before-make action is needed. The part is listed as RoHS non-compliant, so verify your assembly line's exemption or legacy soldering profile before committing the BOM.
Lifecycle and compliance
No successor or second-source alternate has been recorded for this exact order code. The RoHS non-compliant designation is a hard constraint for any design targeting EU RoHS or similar green-materials directives — plan for a lead-free exemption or a drop-in RoHS-compliant alternate if your procurement policy requires it.