Description: A new IC zener with low dynamic impedance and wide operating current range significantly simplifies reference or regulator circuit design. The low dynamic impedance provides better regulation against operating current changes, easing the requirements of the biasing supply. Further, the temperature coefficient is independent of operating current, so that the LM129 can be used at any convenient current level. Other characteristics such as temperature coefficient, noise and long term stability are equal to or better than good quality discrete zeners.