LE9502BTC

Telecom Overview

The LE9502BTC is a dual-channel Ringing Subscriber Line Interface Circuit (RSLIC) from the VE950 series, manufactured by Microchip Technology. It provides BORSCHT functions for two telephone lines in a 44-pin eTQFP package. The device operates with +3.3 V and a switching supply ranging from +8 V to +40 V. It supports ringing signals up to 90 Vpk into a 5 REN load. DC feed current limits are programmable via external resistors, supporting thresholds up to 30 mA. Five operational states include Low Power Standby, Reverse Polarity, Normal Active, Ringing, and Disconnect.

Telecom Feature Summary

• Integrated dual-channel architecture with internal buck-boost switching regulators that track line voltage to minimize power dissipation.
• Programmable world-wide functionality allowing configuration of two-wire AC impedance, loop closure thresholds, and ring trip levels.
• Supports sinusoidal or trapezoidal ringing waveforms with common differential interface capabilities for both channels.
• Includes comprehensive fault detection mechanisms for longitudinal currents, foreign voltages, and thermal overload conditions.

Telecom Applications

• Voice over IP/DSL Integrated Access Devices and Smart Residential Gateways
• Cable Telephony Network Interface Units, Set-Top Boxes, and Cable Modems
• Fiber-to-the-Home (FTTH) and Fiber-In-The-Loop systems
• Wireless Local Loop and Intelligent PBX equipment

Telecom Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm RoHS compliance status as specified in the ordering information. Check for specific packing suffixes if tape and reel delivery is required instead of standard tray packaging. Ensure compatibility with existing system power supplies and clock sources before integration.

Telecom Selection Notes

Select this component for short to medium loop applications requiring integrated power regulation. Evaluate external component requirements for setting current limits and filtering frequencies. Consider the 44-pin eTQFP footprint for board space constraints. Verify that the codec interface matches the TTL-level control signals required for state management.

Telecom Part Context

This device belongs to the VE950 series of RSLICs designed for broadband voice applications. It succeeds earlier Zarlink designs by offering higher integration levels. Related literature includes datasheets for the Le9500, Le9501, and VoSLIC devices. The technology utilizes dielectrically isolated complementary bipolar processes for robust performance.

Telecom Replacement Considerations

Direct substitutes within the same family include the LE9500 and LE9501 models. These alternatives offer similar BORSCHT functionalities but may differ in specific feature sets or pin configurations. Review the respective datasheets to ensure electrical compatibility and mechanical fit before substitution.