What is the TC4W53FU,LF?
The Toshiba TC4W53FU,LF is a dual single-pole single-throw (SPST) analog multiplexer/demultiplexer — essentially two independent 1:1 switches in one 8-pin package. Each channel can pass analog or digital signals up to the supply rails, with a maximum on-resistance of 160 ohms.
The 160-ohm max on-resistance is the ceiling across temperature and voltage; typical values will be lower, but the BOM should budget for the worst-case voltage drop at the switched current. For a signal with 1 µA leakage, the drop is negligible — but if you are switching a resistive load pulling a few milliamps, the voltage error becomes significant. The 3 V to 18 V single-supply range is wide enough to cover a 5 V logic rail, a 12 V industrial bus, or a 9 V battery; note that the control logic thresholds track the supply, so at 3 V the logic-high threshold is lower than at 12 V.
It belongs in factory-floor PLCs, outdoor telecom cabinets, HVAC controllers, and test equipment that sees seasonal swings but not engine-bay heat.
Available in both 8-TSSOP and 8-MSOP packages — both 2.80 mm wide, so the footprint is interchangeable between the two variants. Surface-mount only; no through-hole option.
ROHS3 compliant, so no exemption expiry to track.
The TC4W53FU,LF is an active, production-part number.