LE79R241DJCT

Telecom Overview

The LE79R241DJCT is a high-voltage bipolar Intelligent Subscriber Line Interface Circuit (ISLIC) manufactured by Microchip Technology, originally designed by Zarlink Semiconductor. It operates within the VE790 series chipset alongside ISLAC devices to implement telephone line interface functions. The device supports +5 V and dual battery supplies for power saving. It features intelligent thermal management, programmable DC feed characteristics, and subscriber line diagnostics including leakage resistance and loop resistance sensing. The component is housed in a 32-pin PLCC package with green lead-free plating.

Telecom Feature Summary

• Monitors two-wire interface voltages and currents to support voice transmission and line diagnostics
• Provides programmable DC feed characteristics independent of battery voltage with current limiting
• Integrates test load switches and relay drivers for internal short loops or external ringing
• Supports smooth polarity reversal and tip-open state signaling

Telecom Applications

• Cost-effective voice solutions for long or short loop applications providing POTS and integrated test capabilities
• PBX and KTS systems requiring fully software programmable line interfaces
• Pair gain systems needing remote fault resolution without dedicated test hardware

Telecom Procurement Notes

Verify the ordering suffix 'T' indicates tape and reel packing as specified in the datasheet. Confirm the 'D' prefix denotes the green RoHS-compliant package variant. Ensure compatibility with the VE790 series ISLAC devices for proper system operation. Check for any specific PCN updates regarding packaging or manufacturing changes.

Telecom Selection Notes

Select this component when designing line cards that require high-density multi-channel architectures with software-configurable BORSCHT functions. It is suitable for applications demanding longitudinal balance maintenance and extensive loop supervision. Consider the 32-pin PLCC package constraints and thermal dissipation requirements for the specific PCB layout.

Telecom Part Context

This device belongs to the VE790 series voice chipsets, which integrate all subscriber line functions. It works exclusively with VE790 series ISLAC devices to provide conversion, control, and DSP functions. The chipset satisfies worldwide line card requirements through software configuration of parameters like ringing waveform and DC loop-feed characteristics.

Telecom Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.