U.S. chipmaker Onsemi is making another attempt to acquire smaller rival Allegro MicroSystems for cash, after being rebuffed repeatedly over the past six months, as it looks to ride out a prolonged slump in demand for automotive chips. Onsemi has offered $35.10 for each Allegro share, it said on Wednesday, higher than its previous offer of $34.50 made in 2024. The offer values Allegro at an implied enterprise value of $6.9 billion, inclusive of debt, Onsemi said. The larger rival, which