A5303SLETR-T

Overview

The A5303SLETR-T is a standard 3V photoelectric smoke detector integrated circuit manufactured by Allegro MicroSystems. Designed for integration with infrared optical chambers, it detects light scattered from smoke particles to trigger alarms. The device operates within a temperature range of -20°C to +85°C and features an ultra-low standby current of 300 µA, supporting an average battery life of ten years. It utilizes a 20-TSSOP package (4.40mm width) and includes networking capabilities for interconnecting units. The component is classified as Not Recommended for New Designs (NRND) and has reached End-of-Life status.

Feature Summary

• Ultra-low power consumption enabling extended battery operation in standalone smoke detection applications
• Networking capability allowing multiple units to synchronize alarm signals across interconnected systems
• Integrated latching alarm indicator and timer function to manage reduced sensitivity periods and minimize standby drain

Applications

• Stand-alone photoelectric smoke detectors requiring long battery life
• Interconnected wireless smoke alarm networks
• Residential fire safety monitoring systems

Procurement Notes

This component is officially designated as Not Recommended for New Designs (NRND) and has reached End-of-Life (EOL). Verification of final availability is required before procurement. Sourcing may be limited to existing distributor stock or secondary markets. Designers should confirm the validity of any remaining supply chain channels directly with authorized representatives or distributors, as production is discontinued.

Selection Notes

Engineers must evaluate this part only for maintenance or replacement purposes due to its EOL status. New designs should consider alternative smoke detector ICs currently supported by Allegro MicroSystems. Verify that the 20-TSSOP package dimensions and pinout match the target PCB layout. Ensure the 3V operating voltage aligns with the system's power architecture and that the -20°C to +85°C temperature range satisfies environmental requirements.

Part Context

The A5303 belongs to the A5303 series of photoelectric smoke detector ICs. It is specifically engineered for use with infrared optical chambers to sense particulate matter. The device integrates signal processing for smoke detection while maintaining low power consumption suitable for battery-operated devices. It represents a specialized solution within Allegro's sensor interface portfolio for fire safety applications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Due to the EOL status, no direct official replacements are listed. Designers should consult Allegro MicroSystems for current portfolio alternatives compatible with photoelectric smoke detection architectures.