NE556NIC OSC TIMER DUAL 500KHZ 14DIP|STMICROELECTRONICS|Lead free|RoHS Compliant NA556N NE556N KA556I SA556NE4 NE556NIC OSC TIMER DUAL 14-DIP|TEXAS INSTRUMENTS|Lead free|RoHS Compliant NE556N SA556N KA556I NE556NE4IC OSC TIMER DUAL 14-DIP|TEXAS INSTRUMENTS|Lead free|RoHS Compliant NE556N SA556N KA556I