SK3439A is a 3-terminal positive voltage regulator which is manufactured by RCA. It is used to maintain a constant voltage supply and to protect devices from voltage fluctuations. This part is commonly used in circuits where a stable voltage output is required. It has a rated output current of 500 mA, an operating temperature range of 0°C to 70°C, and a ripple rejection ratio of 10 db. Additionally, SK3439A has an output voltage range of 1.2 to 37 VDC, a nominal line regulation of 0.01%, and a maximum dropout voltage of 1.0 VDC.