MC33215BE

Telecom Overview

The MC33215BE is a highly integrated telephone line interface and speakerphone circuit designed for fully electronic telephones. It performs AC/DC line termination, 2–4 wire conversion, line length AGC, and DTMF transmission. The device supports parallel operation with classical sets at line currents down to 4.0 mA. Key electrical parameters include a loop current range of 4.0 to 130 mA, a VLN biasing voltage of 2.4 to 10 V, and an operating temperature range of –20°C to +70°C. It features stabilized supply points (VDD, VMC, VHF) and separate loudspeaker amplifier power.

Telecom Feature Summary

• Integrated half-duplex controller with signal and background noise monitoring for handsfree operation.
• Adjustable switching depth and smooth switch-over logic between handset and speakerphone modes.
• Built-in automatic gain control (AGC) to compensate for varying line lengths.
• Dedicated transmit and receive amplifiers with differential microphone inputs and sidetone cancellation.

Telecom Applications

• Fully electronic telephone sets with speakerphone functions
• Parallel operation with classical analog telephone sets
• Telephony systems requiring 2–4 wire conversion

Telecom Procurement Notes

Verify the specific suffix 'B' corresponds to the SDIP-42 plastic package (Case 858) as documented in the ordering information. Confirm that the component meets the required industrial temperature specifications of -20°C to +70°C for the target application environment before finalizing procurement.

Telecom Selection Notes

Select this component for designs requiring a single-chip solution for both line interface and audio processing. Ensure the design accommodates the TQFP-52 or SDIP-42 footprint. Verify that the external components for impedance matching and supply regulation align with the typical application circuit requirements provided in the datasheet.

Telecom Part Context

Originally developed by Motorola, this part is now managed by Freescale Semiconductor. It belongs to the family of specialized analog ICs for telecommunications. The MC33215 consolidates multiple discrete functions into one package to reduce board space and cost in traditional landline hardware.

Telecom Replacement Considerations

Public confirmed substitute part numbers are not available in the verified source material.