SA556DTIC OSC TIMER DUAL 500KHZ 14SOIC|STMICROELECTRONICS|Lead free|RoHS Compliant NA556DR SA556DTIC OSC TIMER DUAL 500KHZ 14SOIC|STMICROELECTRONICS (VA)|Lead free|RoHS Compliant NA556DR SA556DTIC OSC TIMER DUAL 500KHZ 14SOIC|STMICROELECTRONICS (VA)|Lead Mixed|RoHS Mixed NA556DR