Don"t forget to compare the input voltages and currents in your electronics device with this LM139JB comparator circuit from Texas Instruments. It has an open collector output. Its typical dual supply voltage is ±3|±5|±9|±12 V, with a minimum of ±1 V and maximum of ±15 V. This comparator has a minimum operating temperature of -55 °C and a maximum of 125 °C. It has 4 channels per chip. This device is made with bipolar technology. This device uses one or two power supplies.