LM2940CT-5.0 (P+) 5Volt positive Voltage regulator by National Semiconductor. Package: TO-220 Download National Semiconductor LM2940CT-5.0 .pdf datasheet: Status: NOS (New Old Stock) Individually tested components: YES (*) RoHS compliant: YES Note: Unlike a normal regulator, a capacitor must be inserted between ground and output in order for these to work, 22uF (min) required, see datasheet.