SPDT analog switch for precision signal routing
Key specs include 35 Ohm max on-resistance, 3 Ohm max channel-to-channel matching, and 250pA max off-leakage current—parameters that keep signal attenuation and DC error low in precision analog paths. Switching is fast: 175ns max turn-on, 145ns max turn-off, suitable for scanning multiple sensor channels in a multiplexed acquisition front-end. The industrial temperature range of -40°C to 85°C qualifies it for factory-floor PLC I/O modules, outdoor telecom line cards, and engine-bay instrumentation where ambient temperature swings are wide.
Crosstalk and charge injection—what they mean for signal integrity
Charge injection is 3pC. When the switch turns off, this packet of charge dumps onto the load capacitor, creating a voltage glitch equal to 3pC divided by the load capacitance. Into a 10pF sampling capacitor in an ADC driver, that is a 300mV step—enough to cause a conversion error if settling time is insufficient. Plan for a settling window after the switch command or use a track-and-hold ahead of the converter.
Lifecycle and sourcing posture
DG419DY+T is listed as Active in production. The part is ROHS3 compliant. For BOM lines that require a dual-source option, verify the specific alternate against your supply rails and temperature requirements.