What the 250 Ohm on-resistance means for your signal path
The MAX4501ESA+ is a single-pole single-throw normally-open (SPST-NO) analog switch from Analog Devices, with a 1:1 multiplexer/demultiplexer configuration. Its 250 Ohm maximum on-state resistance sets the insertion loss floor — for a 10 kOhm load, the voltage divider drops about 2.4% of the signal, which is negligible for most logic-level or audio paths but worth budgeting in precision gain networks.
Switching speed and charge injection — the timing and glitch budget
Turn-on time is 75 ns max, turn-off is 50 ns max, so the switch can handle sample-and-hold or multiplexed ADC inputs up to several MHz without missing the aperture window. The 1 pC charge injection means the feedthrough glitch when the switch opens is small — for a 10 pF hold capacitor, that translates to roughly 100 mV of offset, which is manageable with a short acquisition delay. Leakage current is just 1 nA max in the off state, and channel capacitance is 3 pF on both sides — together these keep the off-isolation high and the signal attenuation low at frequencies up to a few tens of MHz.
Supply range and temperature grade — where it fits on the board
Tube packaging means it arrives in a stick, not a reel, which is convenient for prototype runs and small-batch builds.
Active production and compliance — no end-of-life worry
Analog Devices lists the MAX4501ESA+ as Active in production, with ROHS3 compliance.