What the 4.55V threshold means for your 5V rail
That threshold is set for 5V nominal systems — it triggers before the logic rails brown out, giving the processor or FPGA time to execute an orderly shutdown. The active-low, open-drain output lets you wire-OR it with other reset sources on the same net.
Package and mounting — through-hole for prototyping and legacy boards
Housed in a TO-92-3 (TO-226AA) through-hole package, this part is a direct fit for breadboards, prototype boards, and existing designs that use through-hole supervisors. The three-pin layout — ground, reset output, and sense input — is standard for this function class, making it a drop-in replacement for many TO-92 voltage monitors.
For BOM planning, this is a stable line — no urgency to qualify an alternate unless you need surface-mount or a wider temperature range.