Maxim Integrated’s MAX22191 digital isolators are IEC 61131-2 compliant industrial digital input (DI) devices that convert a 24V digital input into a 2.4mA current. Their voltage thresholds and current levels are compliant with type 1 and type 3 inputs that also minimize power dissipation. These isolators are parasitically powered as the operating power is derived from the input signal, eliminating the need for any external field-side power supply. Their features include a 250ns (maximum) fast response time, reduced heat dissipation, a limited current input, and high integration for flexible circuit designs. Available in a small 6-lead SOT23 package, their operational ambient temperature range of -40°C to 125°C makes them suitable for applications in industrial automation, process automation, motor controls, individual isolated inputs, and current sourcing inputs.