The TC1037, TC1038, and TC1039 are single, low-power comparators designed for low-power applications. These comparators are specifically designed for operation from a single supply. However, operation from dual supplies also is possible, and power supply current is independent of the magnitude of the power supply voltage. The TC1037/1038/1039 operate from two 1.5V alkaline cells down to VDD = 1.8V. Active supply current is 4 µA for theTC1037/1038and6 µA for the TC103 9. Input and output swing of these devices is rail-to-rail. An active low shutdown input, SHDN, is available on the TC1038 and disables the comparator, placing its output in a high-impedance state. The TC1038 draws only 0.05 µA (typical) when the shutdown mode is active. An internally biased 1.20V bandgap reference is included in the TC1039. The reference is accurate to 2.0 percent tolerance. This reference is independent of the comparator in the TC1039. Packaged in a 5-pin SOT-23A (TC1037) or 6-pin SOT-23A (TC1038/1039), these single comparators are ideal for applications requiring high integration, small size, and low power.