The Toshiba TCK321G,LF is a single-channel high-side load switch with an N-channel output, rated for general-purpose on/off switching of power rails up to 2 A continuous. It operates from a 2.3 V to 36 V load voltage range and requires no separate Vcc/Vdd supply — the gate drive is self-biased from the input rail. The 2:1 input-to-output ratio means the switch can be configured with two input pins for load-sharing or redundant supply paths, though it drives a single output.
The 2 A maximum continuous output current is the headline rating for rail selection — a 3.3 V peripheral bus drawing 1.5 A peak stays within margin, but a 1.8 V core rail pulling 2.5 A exceeds the switch's capability and needs a higher-current part. Typical Rds(on) of 98 mOhm at the operating point sets the conduction loss: at 2 A, I²R dissipation is roughly 0.4 W, which the 16-WCSPC package must sink through the board's copper — the thermal path is the PCB pad, not a heatsink. Integrated fault protection — over-temperature, over-voltage, reverse-current blocking, and under-voltage lockout — means the switch handles load-dump and reverse-battery conditions on the output without external clamp diodes or a separate UVLO supervisor.
Surface-mount mounting requires a standard BGA reflow profile; the 0.5 mm ball pitch demands a 4-layer PCB for fan-out of the inner balls to the outer rows. Available in Tape & Reel (TR) for automated pick-and-place or Cut Tape (CT) for prototype quantities — the reel quantity is the standard 3000-piece reel for this package size.
Fully ROHS3 compliant, meaning no exemptions for lead, mercury, cadmium, or other restricted substances — it ships with the LF (lead-free) suffix confirming the finish.