A5366CLWTR-T

Overview

The A5366CLWTR-T is a low-current BiCMOS integrated circuit designed for photoelectric smoke detectors. It interfaces with an infrared emitter-detector pair to sense scattered light from smoke particles. The device supports networking up to 50 interconnected units, ensuring simultaneous alarm activation upon detection by any single unit. It operates within a supply voltage range of 6 V to 12 V and functions continuously between –25°C and 75°C. The component features a variable-gain photoamplifier, internal timing circuits, and a piezoelectric horn driver. It includes specific outputs for driving visible LEDs and IR emitters, along with diagnostic test modes.

Feature Summary

• Supports interconnection of up to 50 detector units for synchronized alarm signaling
• Incorporates a three-stage speedup sensing scheme to minimize false triggering
• Provides dedicated outputs for driving piezoelectric horns and visible status LEDs
• Includes internal low-battery detection and chamber sensitivity monitoring

Applications

• Photoelectric smoke alarms compliant with UL217 or UL268 standards
• Interconnected fire detection systems requiring multi-unit synchronization
• Battery-powered residential smoke detectors utilizing timer mode functionality

Procurement Notes

Verify the current lifecycle status before initiating procurement, as this component may be designated as Not Recommended for New Designs (NRND). Confirm that the 16-pin SOICW surface mount package aligns with the target PCB layout requirements. Ensure that the operating temperature range of –25°C to 75°C meets the environmental specifications of the intended application environment prior to finalizing orders.

Selection Notes

Select the A5366CLWTR-T variant specifically when a surface-mount 16-pin SOICW package is required rather than the through-hole DIP option. This version includes lead-free plating suitable for RoHS-compliant manufacturing processes. Designers must account for external components such as capacitors on pins C1 and C2 to set amplifier gain levels appropriate for their specific smoke chamber geometry and sensitivity targets.

Part Context

This component belongs to the Allegro MicroSystems A5366 series of smoke detector ICs. It serves as the electronic control core for photoelectric sensing applications, providing necessary signal processing and alarm generation capabilities. The series distinguishes itself through integrated networking features and comprehensive diagnostic testing modes, facilitating reliable deployment in safety-critical fire detection environments.

Replacement Considerations

The A5366CA-T is the pin-compatible through-hole alternative within the same family. Verify package footprint differences if transitioning from surface mount to through-hole designs. No other direct substitutes are documented in official datasheets; ensure interface compatibility with existing IR chambers and horn drivers when considering alternatives.