The L78M09CDT-TR part is an ultralow-drop voltage regulator manufactured by STMicroelectronics. It is a three-pin, fixed output voltage regulator with a current rating of 1.5 amperes. It features a very low dropout voltage of 1.0V at full load current and an ultrahigh ripple rejection of 65 dB which makes it ideal for use in sensitive electronic systems such as telecom applications, automotive applications, and industrial products. In addition, the L78M09CDT-TR also offers high accuracy, fast transient response, and low output noise which helps to reduce EMI generated by the device.