Dual SP4T switch with 3.5 Ohm Ron and 85 MHz bandwidth
The MAX4639ESE+T: The 3.5 Ohm max on-resistance keeps signal attenuation low in the passband, while the 85 MHz -3dB bandwidth supports video and high-speed data multiplexing. Switching is fast — 18 ns turn-on and 7 ns turn-off max — so the part can handle time-division multiplexing at rates that would choke a slower analog switch. The 100 mOhm channel-to-channel matching (ΔRon) preserves differential signal balance in precision measurement chains.
Supply flexibility and signal isolation
Charge injection is 13 pC typical — low enough that sample-and-hold droop stays manageable at moderate acquisition rates. Off-isolation is dominated by the -85 dB crosstalk at 1 MHz, meaning adjacent channel bleed is well below the noise floor of most 12-bit ADC front-ends. The off-channel capacitance (9 pF source, 20 pF drain) loads the bus lightly, preserving signal rise times in multiplexed arrays.
Industrial temperature range and 16-SOIC footprint
Surface-mount assembly with a standard reflow profile is straightforward; no special baking or handling beyond MSL precautions.
No official cross-reference or second-source is recorded; the part is the primary BOM entry for this switch function.