HC5503 low cost 24V SLIC for PABX / Key Systems
The HC5503 is a low‑cost 24 V Subscriber Line Interface Circuit (SLIC) optimized for small analog or mixed analog‑digital key telephone and PBX products. It offers a low component count, surface‑mount packaging, and minimal power consumption, making it suitable for compact desktop systems.
The document provides detailed electrical specifications, package dimensions, ordering information, and application circuit examples, along with design notes on impedance matching and gain calculations.
| Operating Battery Range | -21 V to -44 V |
|---|---|
| Short Loop Current Limit | 25 mA |
| Package Type | 24‑lead SOIC |
It operates from –21 V to –44 V.
The short loop current limit is 25 mA.