Dual SP4T analog multiplexer — what it does and where it fits
The MAX350EAP+ from Maxim Integrated (now part of Analog Devices) is a dual 4:1 analog multiplexer / demultiplexer. Each of the two SP4T switch circuits routes one of four inputs to a common output, or the reverse. The part is built for precision analog signal routing in industrial control, data acquisition, and test equipment where signal integrity matters. Key specs: 100Ohm max on-resistance, channel-to-channel matching within 16Ohm, and -90dB crosstalk at 100kHz. Charge injection is just 1pC, which keeps glitch energy low when switching between channels. Off-leakage maxes out at 100pA, so high-impedance sources aren't loaded down. Single supply 2.7V to 16V, dual ±2.7V to ±8V. Industrial temperature range -40°C to 85°C.
What the key ratings mean for your BOM
On-resistance 100Ohm max. Suitable for audio and low-frequency analog signals. The -90dB crosstalk at 100kHz tells you the isolation between channels is solid for audio-band and low-speed analog muxing. If you're multiplexing 1MHz+ signals, expect more feedthrough; this part is comfortable up to a few hundred kHz. Charge injection 1pC. For a 10pF sampling capacitor, that yields about a 100mV step. Switching times (Ton 275ns, Toff 150ns) are fast enough for most industrial multiplexing at rates up to a few MHz. The asymmetry — faster turn-off than turn-on — is typical and usually harmless.
Lifecycle and sourcing reality
That's the green light for new designs and ongoing BOMs — no LTB scramble, no last-time-buy window to chase. ROHS3 compliant, so it's ready for EU and global markets without exemption paperwork.