OptiMOS™ 5 25 V Power Block in 5x6 mm² OptiMOS™ 5 Power Block is a leadless SMD package in a 5x6 mm² package, including a low-side and a high-side MOSFET in a synchronous buck converter configuration. By replacing two separate discrete packages, such as SO8 or SuperSO8, with the Power Block, customers can shrink their designs up to 85%. Standardizing power packages benefits the customer, as the number of different package outlines available in the market place is minimized.