© Dr. Ray Franco, PhD, PE - 208 Fairways Dr., Vicksburg, MS 39183

Smoke Alarm BRK/First Alert Model SA340 Teardown

The BRK/First Alert SA340 is a single station smoke alarm with a sealed non-replaceable 10-year lithium battery. This smoke alarm was replaced by BRK/First Alert Model 0827/SA350.

Limitations:

(1) It cannot be interconnected to other BRK smoke alarms so if one alarms, they all alarm.

For Maximum Resolution, Click on the Body of the Picture.

Front of BRK SA340 Smoke Alarm. — Front of BRK/First Alert Model SA340 Smoke Alarm.

Back of BRK Model SA340 Smoke Alarm — Back of BRK/First Alert Smoke Alarm Model SA340.

Lithium Battery for BRK SA340 Smoke Alarm — Lithium Battery for BRK SA340 Smoke Alarm.

BRK SA340 Lithium Battery Voltage — BRK SA340 Lithium Battery Voltage Measurement.

Lithium Battery Cells for BRK SA340 Smoke Alarm — Lithium Battery Cells for BRK SA340 Smoke Alarm.

BRK SA340 with Lithium Battery Inserted — BRK SA340 with Lithium Battery Inserted.

Inside View of BRK SA340 Smoke Alarm — Inside View of BRK SA340 Smoke Alarm.

Front of BRK SA340 Printed Circuit Board — Front of BRK SA340 Printed Circuit Board.

Back of BRK SA340 Printed Circuit Board — Back of BRK SA340 Printed Circuit Board.

Micro Chip RE46C122. — Early models of the SA340 used an Allegro Microsystem IC. Later models used an Application Specific Intergraded Circuit (ASIC), RE46C122, manufactured by Micro Chip - Data Sheet