Sony said Tuesday the U.S. Department of Justice is probing its electronics unit as part of an industrywide investigation into sales of a particular type of memory chip. The news could spell more trouble for a company already stung by sinking profits, a global battery recall and product delays.

The Japanese company received a subpoena from the Justice Department"s antitrust division seeking information about Sony"s static random access memory, or SRAM, business, company spokesman Atsuo Omagari said.