The Maxim MAX893LESA+T is a single-channel, high-side P-channel power switch in an 8-SOIC package, rated for a continuous 1.2 A output with a typical on-resistance of 70 mΩ. The adjustable current-limiting threshold and built-in over-temperature protection let you set the trip point with one external resistor, saving a dedicated current-sense amplifier and comparator.
70 mΩ Rds(on) and 1.2 A — voltage drop and thermal budget
At the full 1.2 A load, the 70 mΩ typical on-resistance drops about 84 mV across the switch. The dissipation at 1.2 A is roughly 100 mW — the SO-8 package handles that without airflow, but if you are running near the limit in a 85°C ambient, the junction temperature stays inside the 150°C absolute maximum with a little margin. For lighter loads — say 500 mA — the drop is under 35 mV and the dissipation is negligible.
Adjustable current limit — set it with one resistor
The fault protection includes current limiting that you program with a single resistor between the SET pin and ground. The datasheet gives the resistor-value versus limit-current curve; typical values land in the 10 kΩ to 100 kΩ range for limits between 200 mA and 1.2 A. This lets you tailor the trip point to the downstream load — a 500 mA limit for a sensor bus, 1 A for a radio module — without changing the PCB layout. The over-temperature shutdown is a backup that trips when the die temperature exceeds the thermal limit, latching off until the part cools and the enable is cycled.
Package and footprint — 8-SOIC, no exposed pad
For a 1.2 A continuous load, a 1 oz copper pour on the top layer under the package, tied to the GND pins, is enough to keep the junction temperature rise under 40°C. The part is surface-mount only; the Tape & Reel variant (the +T suffix) ships on 13-inch reels, with Cut Tape also available for prototyping.
For a production BOM, this part does not flag a supply-chain risk from the manufacturer side — it is a current, standard-product line.