View mc78l00rev3 datasheet:

Order this document by MC78L00/D MC78L00, A Series Three-Terminal Low Current Positive Voltage Regulators The MC78L00, A Series of positive voltage regulators are inexpensive, P SUFFIX CASE 29 easy–to–use devices suitable for a multitude of applications that require a regulated supply of up to 100 mA. Like their higher powered MC7800 and MC78M00 Series cousins, these regulators feature internal current limiting and thermal shutdown making them remarkably rugged. No external Pin 1. Output 2. GND components are required with the MC78L00 devices in many applications. 1 3. Input 2 These devices offer a substantial performance advantage over the 3 traditional zener diode–resistor combination, as output impedance and quiescent current are substantially reduced. D SUFFIX • W