Methods, systems, and apparatus for testing semiconductor devices. A semiconductor device includes one or more external terminals configured to receive fuse configuration data from an external source. The semiconductor device also includes a soft-blow circuit to generate a soft-blow signal based on the fuse configuration data, and a fuse circuit that includes a fuse and has first and second operational states corresponding to the fuse being intact and blown, respectively. The fuse circuit is configured to receive the soft-blow signal and to select its operational state to be the first or second operational state based on the received soft-blow signal.