PBL38650/2QNT

Telecom Overview

The Infineon PBL38650/2QNT is a Subscriber Line Interface Circuit (SLIC) designed for telecommunications equipment. It operates with a +5 V supply and supports battery feeds from -8 V to -65 V, providing up to 43 V open-loop voltage. The device features programmable loop feed resistance between 100 Ω and 1800 Ω with current limiting up to 45 mA. It includes automatic switching between two battery voltages, longitudinal balance exceeding 60 dB, and integrated detectors for loop current, ground key, and ring trip. Available in a 28-pin PLCC package, it supports active states, ringing, and polarity reversal.

Telecom Feature Summary

• Integrated dual-battery feed system with automatic switching to minimize power dissipation.
• Programmable overhead voltage and transmit gain options for flexible line interface configuration.
• Built-in protection mechanisms including analog overtemperature guard and overvoltage suppression.
• Comprehensive loop monitoring capabilities with dedicated detector outputs for off-hook and fault conditions.

Telecom Applications

• Central Office line cards
• Private Branch Exchange (PABX) systems
• Digital Added Mainline (DAML) interfaces

Telecom Procurement Notes

Verify the specific suffix QNT corresponds to the 28-pin PLCC package variant when sourcing. Confirm that the component meets the required environmental operating range of -40 °C to 110 °C for your deployment. Ensure compatibility with existing control logic levels for the C1, C2, and C3 digital inputs. Check for any updated revision history regarding thermal resistance values compared to older datasheet versions.

Telecom Selection Notes

Select this SLIC for applications requiring low total line interface cost and high flexibility. It is suitable for designs needing programmable impedance and complex filtering networks. Consider the 28-pin PLCC package if board space allows for larger footprints. Evaluate the need for dual battery feeds to optimize efficiency in high-current loop scenarios.

Telecom Part Context

This component belongs to Infineon's FlexiSLIC family of subscriber line interface circuits. It is engineered for robust performance in wireline communications infrastructure. The device integrates functions typically requiring multiple discrete components, simplifying the design of telephone line interfaces.

Telecom Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify pinout compatibility and electrical specifications before considering alternative SLIC devices from other manufacturers.