DK501/SOP-8 IC-501 OFF-LINE SWITCH MODE POWER CONTR. BUCK SOP8 The DK501/SOP-8 is a high-quality product offering IC-501 OFF-LINE SWITCH MODE POWER CONTR. BUCK SOP8. With a shrink ratio of N/A and -25°C~+125°C operating temperature, it provides reliability in various applications.