ON Semiconductor Corp. of Phoenix and Donald Colvin, its executive vice president and chief financial officer, have mutually agreed to Colvin’s resignation as an officer of the company. The company said he would continue at the firm for up to 90 days while a replacement is sought. The search process for a new CFO has been launched by the board. ON Semiconductor supplies silicon solutions for energy-efficient electronics. Its power and signal management, logic, discrete and custom devices help customers solve design challenges in automotive, computing, LED lighting, medical, military, aerospace, consumer and power applications.