MT8888CSR1

Telecom Overview

The MT8888CSR1 is a DTMF transceiver integrated circuit manufactured by Microchip Technology, designed for telecommunications interface applications. It operates within a supply voltage range of 4.75 V to 5.25 V, with a nominal operating voltage of 5 V and a maximum power dissipation of 1 W. The device draws a typical operating current of 7 mA. It supports an extended industrial temperature range from -40°C to +85°C. The component is housed in a 20-SOIC surface-mount package with a width of 7.50 mm. It carries RoHS compliance and has a Moisture Sensitivity Level (MSL) rating of 3, allowing for 168 hours of floor life at controlled conditions.

Telecom Feature Summary

• Integrates complete dual-tone multi-frequency transmitter and receiver functions into a single unit.
• Provides central office quality signal processing capabilities for reliable telecommunication signaling.
• Features a dedicated microprocessor port for direct control and integration with host systems.
• Includes adjustable guard time settings to optimize tone detection accuracy.

Telecom Applications

• Telecommunications equipment requiring DTMF signaling
• Central office telephone interfaces
• Microprocessor-controlled dialing systems

Telecom Procurement Notes

The MT8888CSR1 is officially listed as obsolete by the manufacturer, with discontinuation notices recorded in late 2025. Availability is restricted, and distributors may not stock this item in all regions. Engineers should verify current lifecycle status and lead times carefully before finalizing designs, as replacement components or alternative sourcing strategies may be necessary for production continuity.

Telecom Selection Notes

Designers must ensure the power supply remains stable between 4.75 V and 5.25 V to maintain proper operation. The 20-SOIC package requires appropriate surface-mount assembly techniques. Due to MSL 3 classification, strict moisture management protocols are required during storage and handling. Verify that the host microcontroller interface matches the device's pinout and logic levels for seamless integration.

Telecom Part Context

This component belongs to the MT8888 family of DTMF transceivers produced by Microchip Technology. It shares core functionality with variants such as the MT8888CS1, differing primarily in packaging or suffix specifications. The MT8888 series is established for providing robust dual-tone multi-frequency generation and decoding in standard telephony environments.

Telecom Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official Microchip obsolescence notices for recommended alternatives or contact technical support for specific cross-reference information.