190 MHz bandwidth, 6.5 Ohm on-resistance — SPDT switch in SOT-23-8
The Analog Devices ADG619BRTZ-REEL is a single-pole double-throw (SPDT) analog switch in a SOT-23-8 package, rated for single-supply operation from 2.7 V to 5.5 V or dual supplies from ±2.7 V to ±5.5 V. Its 6.5 Ohm max on-resistance and 190 MHz -3 dB bandwidth suit it for routing analog signals up to video frequencies, while the 2:1 multiplexer/demultiplexer configuration handles one input to two outputs or the reverse. Typical applications include audio signal switching, data acquisition front-ends, and low-frequency multiplexing in industrial control or test equipment where board space is tight.
6.5 Ohm on-resistance — what it means for signal integrity
The 6.5 Ohm max on-resistance is the series resistance the switch adds to the signal path. For a 50 Ohm system, that's about 0.26 dB insertion loss — acceptable for most audio and baseband analog signals. The channel-to-channel matching of 700 mOhm ensures that if you're switching between two sources, the gain error between paths stays small. Charge injection of 110 pC is a transient glitch when the switch changes state; it matters in sample-and-hold or precision ADC front-ends where the injected charge can corrupt the held voltage.
Switching speed and crosstalk
Turn-on time is 120 ns max, turn-off 75 ns max — fast enough for audio-rate multiplexing and moderate-speed data acquisition, but not for high-speed RF switching. Crosstalk at -67 dB at 1 MHz means the off-channel bleeds about 0.05% of the signal into the active path; for audio this is fine, but for 16-bit precision at higher frequencies you'd want a part with better isolation. Off-leakage is 250 pA max, negligible for most analog circuits.
The SOT-23-8 package is a common small-outline footprint; the part is surface-mount only.