The 1N5309 is a current regulator diode that provides a nominal regulator current of 3.00 mA at a source voltage of 25V. Its regulator current operates within a minimum of 2.70 mA and a maximum of 3.30 mA. Key electrical characteristics include a dynamic impedance of 0.300 MΩ at 25V, a minimum knee impedance of 0.029 MΩ at 6.0V, and a maximum limiting voltage of 2.25V. With a peak operating voltage of 100V and a wide operating temperature range, this diode is suitable for applications requiring stable current limiting and high source impedance.