18 Sierra Semiconductor SC11003CMFull Duplex Single Chip Modem SOIC 20Pin NEW 18 Sierra Semiconductor SC11003CM 300 Bit Per Second Modem 20-Pin SOIC -NEW- SMD SMT. Type: 300 Bit Per Second Modem 20-Pin SOIC. Manufactured by: Sierra Semiconductor. QUANTITY: 18. Condition: NEW. byJuly 5, 2026