Dual SPST-NO switch with -85 dB crosstalk — what it means for your signal path
The Maxim Integrated MAX320CUA+ is a dual SPST-NO analog switch in an 8-uMAX/uSOP package. It routes two independent signal channels with a 1:1 multiplexer/demultiplexer configuration, each channel presenting a maximum on-resistance of 35 ohms. The -85 dB crosstalk at 1 MHz makes it a clean choice for audio routing, precision instrumentation, and low-frequency analog multiplexing where channel isolation matters. Charge injection is rated at 2 pC, low enough for sample-and-hold or deglitching a DAC output without adding noticeable offset.
35 ohm on-resistance and 300 mOhm matching — BOM fit for balanced paths
On-resistance flatness across the analog range is not specified in the brief, but the 300 mOhm channel-to-channel matching (Delta Ron) gives confidence that the two switch paths will track within a narrow band — useful for stereo audio or dual-channel sensor conditioning where gain matching is required. The 100 pA maximum off-leakage and 9 pF off-capacitance keep signal integrity intact at moderate impedances.
Supply range and temperature grade — design-in boundaries
The MAX320CUA+ operates from a dual supply of ±2.7 V to ±8 V. The 0°C to 70°C commercial temperature grade limits this part to indoor, office, or lab environments — not for automotive or industrial outdoor use. Switching times are 150 ns turn-on, 100 ns turn-off, fast enough for audio muting and low-speed multiplexing but not for video or high-speed data.
Active production — no immediate second-source pressure
The MAX320CUA+ carries an Active lifecycle status with ROHS3 compliance.