Quad SPST-NC analog switch for precision signal routing
The Maxim Integrated DG441CY+T is a quad single-pole single-throw normally-closed analog switch in a 16-SOIC package. It handles both single-supply rails from 10V to 30V and dual supplies from ±4.5V to ±20V, with a maximum on-resistance of 85 Ohm. The 1:1 multiplexer/demultiplexer circuit per channel makes it a straight pass-gate for analog or digital signals.
Key parametric strengths for analog muxing
Crosstalk is rated at -100dB at 1MHz — a strong figure that keeps channel bleed low in precision analog multiplexing, audio routing, or data acquisition front-ends. Charge injection sits at 5pC, which matters for sample-and-hold circuits where injected charge can shift the held voltage. Channel-to-channel on-resistance matching is within 4 Ohm max, helping maintain gain accuracy in multi-channel systems.
Switching speed and leakage
Turn-on time is 250ns max, turn-off 120ns max — fast enough for audio muting, relay replacement, or moderate-speed analog switching. Off-channel leakage current is a maximum 500pA, and channel capacitance (both source and drain off) is 4pF each, so the part loads the signal path lightly in the off state.
This limits the part to indoor equipment, bench instruments, audio gear, office electronics, and similar environments. Not suited for industrial or automotive applications without a wider-temperature variant.