Quad SPST-NC analog switch — the crosstalk floor matters
The Maxim Integrated DG201ACSE+T is a quad single-pole single-throw normally-closed (SPST-NC) analog switch in a 16-SOIC package. It routes four independent signal channels with a multiplexer/demultiplexer circuit ratio of 1:1, meaning each switch is a simple pass-or-block element. The headline spec is the -90 dB crosstalk at 100 kHz — that figure tells you channel-to-channel bleed is low enough for precision analog multiplexing, audio routing, or data-acquisition front ends where a -80 dB floor would corrupt the measurement.
200 Ohm on-resistance — what it costs the signal
Max on-resistance of 200 Ohm sets the series impedance each channel adds to the signal path. In a unity-gain buffer or a low-impedance source, that 200 Ohm drops voltage and adds a pole with the load capacitance. For a 10 kOhm load the attenuation is about 2%, acceptable for most control and monitoring signals. The 5 pF channel capacitance (both CS(off) and CD(off)) combines with the 200 Ohm to give a roughly 1 MHz bandwidth corner — fine for audio and low-frequency analog, but not for video or fast ADC drive.
Switching speed and charge injection
Turn-on time is 600 ns max, turn-off 450 ns max. That asymmetry — faster off than on — is typical for a NC switch; the break-before-make timing matters if you are multiplexing sources into a single ADC input. The 20 pC charge injection is the glitch charge dumped onto the signal line when the switch changes state. In a 12-bit system with a 10 nF hold capacitor, 20 pC translates to about 2 mV of offset error per transition — something to budget for in sample-and-hold or integrator reset circuits.
Supply range and leakage
Dual-supply operation from ±4.5 V to ±18 V covers the common ±5 V, ±12 V, and ±15 V analog rails. The 5 nA max off-leakage (IS(off)) is low enough that it does not load precision references or high-impedance sensor outputs. Commercial temperature grade (0°C to 70°C) suits bench instrumentation, lab equipment, office electronics, and indoor industrial control panels — not extended or automotive environments.
Package and mounting
Surface-mount 16-SOIC with 0.154" body width (3.90 mm). The supplier device package is also 16-SOIC — no footprint mismatch between the generic case code and the specific part marking.
Lifecycle and sourcing posture
The DG201ACSE+T carries an active lifecycle status and is ROHS3 compliant. For BOM planning, the active status means no supply discontinuity risk from the manufacturer side.