LE7942B-1DJC

Telecom Overview

The LE7942B-1DJC 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 a programmable constant-current feed with receive current gain of 500. The device includes an on-chip switching regulator for low-power dissipation and supports commercial temperature ranges of 0°C to +70°C. It provides loop-detect thresholds, ground-key detection, polarity reversal, and test relay drivers in a 32-pin PLCC package.

Telecom Feature Summary

• Integrated on-chip switching regulator enables low-power operation while supporting standard telephony line interface functions.
• Programmable DC feed and receive gain allow flexible configuration for various subscriber line requirements.
• Built-in ground-key detector and off-hook/ring-trip detectors provide comprehensive line status monitoring capabilities.

Telecom Applications

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

Telecom Procurement Notes

Verify the specific ordering suffix '-1' corresponds to the required performance grade and confirm the 'D' designation indicates the green RoHS-compliant package. Ensure compatibility with existing board layouts for the 32-pin PLCC form factor and validate thermal management strategies given the power dissipation characteristics under active load conditions.

Telecom Selection Notes

Select this component when designing PBX or KTS applications requiring integrated SLIC functionality with low standby power consumption. Consider the on-chip switching regulator if minimizing external passive components is a priority. Verify that the commercial temperature range meets the environmental specifications of the target deployment location.

Telecom Part Context

This part belongs to the Le7942B family of Subscriber Line Interface Circuits originally developed by Legerity Holdings and acquired by Zarlink Semiconductor. The LE7942B-1DJC variant specifically denotes the performance graded version housed in a lead-free, halogen-free green plastic quad flat pack package suitable for modern assembly processes.

Telecom Replacement Considerations

The datasheet notes compatibility with the Le7942 device. Designers should verify pinout and electrical parameter alignment before substituting other SLICs from different manufacturers or families.