Check the listing for details. National Semiconductor LM2597HV 150kHz, 0.5 Amp Step-Down Voltage Regulator 40pc. Condition: New. Listed at 34.95 USD. As Pictured. Skycraft Parts & SurplusOrlando, FL Specializing in surplus electroniccomponents and parts for over 40 years! National Semiconductor. WARNING: This product contains, or may contain, chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.