| HC5503 | Low Cost 24V SLIC For PABX / Key Systems | Datasheet*) |
| HC5503C | Unbalanced PBX / Key System SLIC, Subscriber Line Interface Circuit | Datasheet*) |
| HC5503T | Balanced PBX / Key System SLIC, Subscriber Line Interface Circuit | Datasheet*) |
| HC5503PRC | Low Cost SLIC For Large Telecom Switches | Datasheet*) |
| HC5503CB | Low Cost 24V SLIC For PABX/Key Systems | Datasheet*) |
| HC5503CM | Low Cost 24V SLIC For PABX/Key Systems | Datasheet*) |
| HC5503CCB | Unbalanced PBX/Key System SLIC, Subscriber Line Interface Circuit | Datasheet*) |
| HC5503CCP | Unbalanced PBX/Key System SLIC, Subscriber Line Interface Circuit | Datasheet*) |
| HC5503PRCB | Low Cost SLIC For Large Telecom Switches | Datasheet*) |
| HC5503PRCM | Low Cost SLIC For Large Telecom Switches | Datasheet*) |
| HC5503TCB | Balanced PBX/Key System SLIC, Subscriber Line Interface Circuit | Datasheet*) |
| HC5503TCP | Balanced PBX/Key System SLIC, Subscriber Line Interface Circuit | Datasheet*) |
