LE7942BDJCT

Telecom Overview

The LE7942BDJCT is a Subscriber Line Interface Circuit (SLIC) from the VE580 Series, manufactured by Microchip Technology. It operates on a –19 V to –58 V battery supply and features programmable constant-current feed with receive current gain of 500. The device includes an on-chip switching regulator for low-power dissipation and supports polarity reversal and ground-key detection. It is housed in a 32-pin PLCC package and designed for commercial operation between 0°C and +70°C.

Telecom Feature Summary

• Integrated on-chip switching regulator reduces power dissipation while supporting flexible configuration with or without external components.
• Programmable loop-detect threshold and ground-key detector enhance line monitoring capabilities.
• Supports polarity reversal and tip-open state functionality for versatile subscriber line management.

Telecom Applications

• Private Branch Exchange (PBX) systems
• Key Telephone Systems (KTS)
• Subscriber line interface circuits

Telecom Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and environmental compliance. Confirm availability through authorized distributors as standard products may have varying lead times. Ensure the component meets RoHS Directive 2002/95/EC requirements if using green package variants.

Telecom Selection Notes

Select this SLIC for applications requiring low standby power and integrated regulation. Consider the 32-pin PLCC package for through-hole assembly. Evaluate thermal dissipation needs based on operating voltage and load resistance. Verify compatibility with existing control logic levels for C1-C4 inputs.

Telecom Part Context

This component belongs to the Le7942B family, originally developed by Legerity Holdings before acquisition by Zarlink Semiconductor. It serves as a direct replacement for the Le7942 device, maintaining pin compatibility while offering enhanced features like the internal switching regulator.

Telecom Replacement Considerations

The LE7942BDJCT is compatible with the Le7942 device. Check datasheet notes for valid combinations including Le7942BDJC and Le7942BJC variants to ensure equivalent performance and packaging options.