LM78L15ACM Linear Voltage Regulator, 7815, Fixed, Positive, 16.7V To 35V. The LM78L15ACM is a 3-terminal Positive Regulator available with several fixed output voltages making them useful in a wide range of applications. When used as a Zener diode/resistor combination replacement, the LM78LXX usually results in an effective output impedance improvement of two orders of magnitude and lower quiescent current.