The LM336Z5 and LM336BZ5 integrated circuits are precision 5.0 V shunt regulators. The monolithic IC voltage reference operates as a low temperature coefficient 5.0 V Zener with 0.6ohm dynamic impedance. A third terminal on the LM336Z5 and LM336BZ5 allows the reference voltage and temperature coefficient to be trimmed easily. The LM336Z5 and LM336BZ5 are useful as precision 5.0 V low voltage references which makes it convenient to obtain a stable reference from low voltage supplies. Further, since the LM336Z5 and LM336BZ5 operate as shunt regulators, they can be used as either a positive or negative voltage reference.