Products
Product image
Part number
Avg. Standby Current
Low-Battery Alarm Threshold
Detection Method
IRED Pulse Parameters
Buzzer Drive Capability
Interconnect Units
Package
Temp. Grade
ST59A/S128 µA (typ, standby)
Low supply alarm/trip voltage (VIN=VDD/3) 6.5V ~ 7.8V
Photoelectric (IR photoelectric chamber, receives light scattered by smoke particles)
IRED output drives external NPN to drive IR photodiode; IRED pulse period by mode: smoke test 7.2~8.8 s (typ 8.1 s), chamber sensitivity test 28.8~35.2 s, pushbutton test 0.9~1.1 s; pulse width typ 94~116 µs, rise <30 µs, fall <200 µs
BRASS/SILVER push-pull output drives external piezoelectric buzzer, generating alarm tones and status indication; high/low level output (VOL<1.0V, VOH≥5.5V)
I/O pin can interconnect up to 40 detectors for auxiliary/remote alarm and auto-dialer
SOP-16 (12-pin scheme)
-10°C ~ +60°C