U4089B-PFNG3Y

Telecom Overview

The U4089B-PFNG3Y is a monolithic integrated circuit designed for feature phones, answering machines, and fax machines. It integrates speech circuits, sidetone equivalent, ear protection rectifiers, and an electronic inductance for line powering. The device supports operation from a 10-mA line current and includes a regulated 3.3V supply (2mA) and unregulated supply (7V). Key electrical parameters include a transmit gain adjustment range of 40-50 dB, receiving gain adjustment of -8 to +2 dB, and speaker amplifier gain up to 36 dB. Acoustic feedback suppression offers up to 50 dB attenuation. The component operates within an ambient temperature range of -25°C to +75°C and utilizes an SSO44 package.

Telecom Feature Summary

• Integrated acoustic feedback suppression with adjustable attenuation
• Automatic line-loss compensation and anti-clipping protection
• Built-in voice switch enabling open-listening or hands-free operation
• Line-powered operation with internal voltage regulation

Telecom Applications

• Feature Phones
• Answering Machines
• Fax Machines
• Speaker Phones

Telecom Procurement Notes

Verify the ordering suffix PFNG3Y indicates a taped and reeled, lead-free package configuration. Confirm the manufacturer origin as Atmel, now part of Microchip Technology. Ensure the component meets RoHS compliance standards required for the specific application environment.

Telecom Selection Notes

Select this component for applications requiring complete analog signal processing integration on a single chip. It is suitable for designs needing low external component counts and EMI filtering on critical I/O pins. Consider the SSO44 package dimensions and thermal resistance when designing the PCB layout.

Telecom Part Context

This device belongs to the U4089B series of telephone circuits. It serves as a linear integrated circuit providing comprehensive audio handling for subscriber sets. The family includes variants such as U4089B-PFNY, differing primarily in packaging format.

Telecom Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Cross-reference with other U4089B series variants if packaging differences are the only constraint.