Switch selection for analog signal routing
The MAX4660ESA+ is a single-pole double-throw (SPDT) analog switch from Analog Devices, designed for routing analog signals up to 225 MHz bandwidth. Its 25 ohm max on-resistance keeps insertion loss low in the signal path, while the -76 dB crosstalk at 1 MHz isolates the two channels enough for precision measurement or audio crosspoint applications. Charge injection is rated at 1.5 pC typical, which matters when the switch feeds a high-impedance sample-and-hold or ADC input — the injected charge can shift the held voltage if the downstream capacitance is small.
Bandwidth and isolation for video and RF paths
The 225 MHz -3 dB bandwidth supports composite video switching, baseband RF routing up to VHF, and high-speed data multiplexing. The -76 dB crosstalk at 1 MHz means the off-channel leakage is roughly 1600× below the signal level, adequate for 10-bit analog systems. Channel capacitance is 6 pF on both source and drain sides, which loads the signal line by about 6 pF per node — factor this into the RC time constant when driving long PCB traces or cable runs. Channel-to-channel on-resistance matching is 400 mOhm max, so the two signal paths see nearly identical attenuation — useful for gain-matched multiplexer stages.
Package thermal path and footprint
Without the pad connection, the junction-to-ambient thermal resistance rises significantly, limiting the continuous current the switch can handle at elevated ambient temperatures. Tape-and-reel availability is not listed in the current evidence — confirm packaging preference at quote time.
Lifecycle and compliance posture
ROHS3 compliant per.