UC3544NG4 [Texas Instruments]

These devices include over-voltage, under-voltage, and current sensing circuits with an internal 1% accurate reference. They feature programmable time delays, an SCR crowbar drive of 300mA, remote activation capability, and an optional over-voltage latch. The UC1544 series adds uncommitted comparator inputs for low voltage sensing. The circuits provide open collector outputs that can be used independently or wire-ORed together, with the SCR trigger directly connected to the over-voltage sensing circuit but optionally activatable by other outputs or external signals.