LE57D111BTC

Telecom Overview

The LE57D111BTC is a dual-channel Subscriber Line Interface Circuit (SLIC) from the VE580 series, manufactured by Microchip Technology. It integrates two POTS line interfaces into a single 44-pin eTQFP package to maximize board density. The device operates on a +5 V supply and a battery voltage ranging from -39 V to -58 V. Key electrical parameters include an off-hook loop current threshold of 9 mA to 11 mA in the active state, a standby loop current accuracy within 0.7IL to 1.3IL, and a longitudinal balance of at least 50 dB. It features on-chip thermal management via external resistors connected to TMG pins.

Telecom Feature Summary

• Integrates dual-channel SLIC functionality with on-chip Thermal Management (TMG) for reduced power dissipation.
• Supports four control states: Active (Normal and Reverse Polarity), Standby, and Disconnect.
• Features low standby power consumption and programmable ring-trip detection thresholds.
• Simplifies design by setting two-wire impedance using a single external component.

Telecom Applications

• High-density linecard applications for Central Offices (CO).
• Digital Loop Carrier (DLC) systems.
• POTS markets requiring compliance with specifications in China, Korea, Japan, Taiwan, and Australia.

Telecom Procurement Notes

Verify the specific ordering suffix 'BTC' corresponds to the 44-pin eTQFP green package configuration as documented in the datasheet. Confirm that the procurement channel accepts the tray packaging format specified for this variant. Ensure compatibility with lead-free assembly processes given the matte-tin plating and environmental compliance of the package materials.

Telecom Selection Notes

Select this component when high linecard density is required due to its dual-channel integration in a compact footprint. Consider the on-chip thermal management capabilities if operating in environments where power dissipation limits are critical. Verify that the application requires only loop start supervision, as the device is optimized for this mode of operation.

Telecom Part Context

The LE57D111BTC belongs to the VE580 series of telecommunications interface ICs originally developed by Zarlink Semiconductor Inc., now part of Microchip Technology. This series is designed for cost-effective and high-performance line circuit implementations. The device is often paired with compatible codec/filter devices, such as the QLSLAC™ family, to form a complete programmable line interface solution.

Telecom Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official Microchip or distributor resources for cross-reference information regarding obsolete or alternative components.