Renesas HC9P5504B-5ZX96

Overview

HC9P5504B-5ZX96 from Intersil is a monolithic EIA/ITU-compliant SLIC (Subscriber Line Interface Circuit) designed for analog and digital PBX systems. It integrates BORSHT functions - battery feed (41mA loop current), ring relay driver, switch hook/ground key detection, and transhybrid balancing - in a 24-pin SOIC package with Pb-free termination and tape-and-reel packaging. It operates from ±48V/±5V supplies and supports selective power denial during system overload.

For engineers reviewing the HC9P5504B-5ZX96 datasheet, HC9P5504B-5ZX96 pinout, HC9P5504B-5ZX96 application, or HC9P5504B-5ZX96 equivalent, this device serves as a drop-in replacement for HC-5504 in solid-state line card designs requiring longitudinal balance >65dB, low idle noise (<5 dBrnC), and controlled loop current regulation across 200–1200Ω loops.

Technical Context

The HC9P5504B-5ZX96 implements dielectric-isolated bipolar process technology to enable direct operation from -58V to -42V VB- and +5V/+12V VB+, delivering 41mA off-hook loop current with ±2mA tolerance at RL = 200Ω. Its integrated ring relay driver provides TTL-compatible open-collector RD output with <0.5V VOL at 62mA sink capability and <100μA off-leakage.

It features dual ground-referenced detection logic (SHD and GKD) with programmable thresholds (10mA/5mA for SHD; 20mA/10mA for GKD), plus power denial (PD) input that disables detection and relay drive during emergency overload. The uncommitted op amp (OUT/+IN/-IN) supports transhybrid balancing with ±6.2V swing at VB+ = 12V and 1MHz GBW.

Key Specifications

Pinout & Package

HC9P5504B-5ZX96 is housed in a 24-lead SOIC package (M24.3 drawing), Pb-free with 100% matte tin termination, rated MSL-3 per J-STD-020B and suitable for both SnPb and Pb-free reflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SLIC applications.

Compared with HC5504B-5Z and HC9P5504B-5, the HC9P5504B-5ZX96 uniquely combines Pb-free compliance, tape-and-reel delivery, and full MSL-3 qualification - making it the sole option for automated SMT production targeting RoHS-compliant PBX line cards.

Availability

HC9P5504B-5ZX96 is available at Aetrix Electronics and suitable for Direct Inward Dial (DID) trunks, voice messaging PBXs, and analog line card designs requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant manufacturing.

Supply support for HC9P5504B-5ZX96 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Intersil Corporation (now part of Renesas Electronics) is a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for communications, industrial, and computing markets.

The HC-5504B product line was engineered specifically for solid-state PABX line interface applications, integrating BORSHT functions into a single monolithic die to replace bulky discrete hybrids and improve system reliability.

FAQ

What is the maximum longitudinal current the HC9P5504B-5ZX96 can withstand without performance degradation?

The HC9P5504B-5ZX96 withstands longitudinal currents up to 30mARMS (15mARMS per leg) without degradation, as verified in the FN2886 datasheet Absolute Maximum Ratings section. This rating applies with proper external secondary protection (e.g., 2A/200V diode bridge) and enables robust operation in environments prone to power-line induction or lightning-induced surges. The device's dielectric isolation process ensures stable BORSHT function delivery under these stress conditions.

Does the HC9P5504B-5ZX96 support both tip-injected and ring-injected ringing configurations?

Yes, the HC9P5504B-5ZX96 supports both tip-injected and ring-injected ringing, as confirmed in the Functional Diagram and Applications Diagram (Figure 1) of the FN2886 datasheet. The RS (Ring Sync) input allows precise timing alignment: for tip-injected systems, RS positive edge aligns with the negative-going zero crossing of ring voltage at RFS; for ring-injected, it aligns with the positive-going zero crossing. This flexibility enables interoperability with diverse PBX ring generators.

What external components are mandatory for basic HC9P5504B-5ZX96 operation?

Three external capacitors are mandatory: C3 (0.3µF, 30V) between Pin 5 and AG for loop current limiting; C2 (0.15µF, 10V) between Pin 17 and DG to prevent false ground key detection; and C4 (0.5–1.0µF, 20V nonpolarized) between Pin 22 and AG for ring trip detection and longitudinal noise rejection. Additionally, 150Ω feed resistors (RB1–RB4) and a ring relay are required for full BORSHT implementation.

How does the power denial (PD) function affect switch hook detection in the HC9P5504B-5ZX96?

When PD is asserted (low), the HC9P5504B-5ZX96 invalidates SHD and GKD outputs per the Pin Descriptions table in FN2886 Rev 8.00. Specifically, SHD and GKD logic states become indeterminate, and RD is forced high to de-energize the ring relay. This hardware-level override ensures immediate loop power removal during system overload, independent of ongoing supervision signals - a critical safety feature for emergency PBX load shedding.

Is the uncommitted op amp in the HC9P5504B-5ZX96 internally compensated for unity-gain stability?

Yes, the uncommitted op amp (Pins 18–20) in the HC9P5504B-5ZX96 is internally compensated for unity-gain stability, as evidenced by its specified 1MHz small-signal gain-bandwidth product and guaranteed ±6.2V output swing at VB+ = 12V. The datasheet's Uncommitted Op Amp Specifications table confirms stable operation with AVCL = 1, and the Applications Diagram shows it configured as an active transhybrid balancer without external compensation components.