What this switch does and where it fits
The MAX4553ESE+ from Analog Devices (formerly Maxim Integrated) is a quad SPST analog switch with both normally-open and normally-closed configurations per channel. It routes analog or digital signals up to 12 V single supply or ±6 V dual supplies, with a maximum on-resistance of 120 Ohm and channel-to-channel matching within 1 Ohm. The -90 dB crosstalk at 100 kHz makes it suitable for precision audio or instrumentation paths where channel isolation matters. Charge injection is rated at 2 pC, low enough for sample-and-hold front ends or DAC output multiplexing. The industrial temperature range (-40°C to 85°C) covers motor-drive cabinets, outdoor telecom enclosures, and factory-floor I/O modules.
120 Ohm on-resistance — what it means for signal integrity
With a maximum on-resistance of 120 Ohm, this switch is suited for voltage-mode signal routing where the load impedance is high, so the voltage drop across the switch stays low. The 1 Ohm channel-to-channel matching keeps gain errors consistent across all four channels.
Switching speed and charge injection
Turn-on time is 110 ns max, turn-off 90 ns max, which allows switching at low-MHz rates for multiplexed data acquisition or audio crosspoint applications. The 2 pC charge injection is the amount of charge dumped onto the signal line when the switch opens — low enough that a downstream sample-and-hold capacitor sees minimal voltage glitch. If you are switching sub-millivolt signals, the charge injection will appear as a transient; account for it in the settling time budget.
Lifecycle and compliance
It is ROHS3 compliant, so it meets the latest EU restriction requirements for lead and other substances.