A5367CA-T

Overview

The A5367CA-T is a low-current BiCMOS integrated circuit designed for ionization-type smoke detectors. It supports networking up to 125 units and includes a piezoelectric horn driver with temporal patterns compliant with UL217, NFPA72, and ISO8201. The device operates on a 6.0 V to 12.0 V supply with typical standby current of 5.0 μA at 9.0 V. It features an internal oscillator period of 1.67 s in standby and 41.67 ms during alarm. The package is a 16-pin DIP (suffix A) with lead-free plating (suffix T). Operating temperature range is –10°C to 60°C.

Feature Summary

• Interconnect capability allows linking up to 125 detectors for synchronized alarms.
• Built-in timer mode enables reduced sensitivity periods to minimize nuisance alarms.
• Active guard outputs protect the detector input from surface leakage currents.
• Pulse testing functionality facilitates periodic low-battery condition checks.

Applications

• Ionization smoke detection systems
• Battery-operated safety and security applications
• Networked fire alarm installations

Procurement Notes

Verify component authenticity through authorized Allegro MicroSystems distributors or certified partners. Confirm that the ordering suffix matches the required lead-free specification and package type. Review the latest datasheet revision for any updates to electrical characteristics or mechanical dimensions before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring low average standby current to extend battery life. Ensure the external oscillator capacitor is a low-leakage type such as PTFE or polypropylene. Verify that the application environment falls within the specified operating ambient temperature range of –10°C to 60°C.

Part Context

This part belongs to the A5367 series of smoke detector ICs manufactured by Allegro MicroSystems. It is specifically engineered for ionization chambers and offers comprehensive signal conditioning and alarm driving capabilities in a single low-cost package.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult Allegro MicroSystems directly for potential obsolescence management or alternative product recommendations.

FAQ

How does the device handle false triggering?

The A5367 incorporates built-in hysteresis which increases the sensitivity threshold voltage by approximately 130 mV upon smoke detection, thereby reducing the likelihood of false triggering.

What is the function of the TIMER START pin?

Applying a high-to-low transition to the TIMER START pin initiates a reduced sensitivity period lasting approximately 10 minutes, allowing users to silence nuisance alarms caused by steam or cooking.

How is the low-battery threshold adjusted?

The low-battery threshold can be externally adjusted by connecting a resistor between the LOW-V SET pin and either VDD or VSS, modifying the internal voltage divider reference.