The ADC LM-38 is a linear voltage regulator designed by National Semiconductor (now part of Texas Instruments) in the 38 pinout quad package. It provides a regulated output voltage of 5 volts with an input voltage range of 7 to 18 volts. The LM-38 also features an internal current limiting circuit that limits the output current to a maximum of 250 milliamperes. It has a typical efficiency of 75% and a maximum noise level of 60 millivolts peak-to-peak. Overall, the ADC LM-38 is a reliable and efficient voltage regulator suitable for a wide range of applications.