LS1240 series datasheets. Manufacturer: CNTK.

LS1240 Electronic tone ringer with built-in bridge rectifier. Supply voltage Vs=26V. Current consumption without load Ib=1.5A(typ). Activation voltage Von=12V(min),13.5V(max). Sustaining voltage Voff=8V(min),9V(max). in 8-pin DIP package. Operational temperature range from -20°C to 70°C. Datasheet*) LS1240A Electronic tone ringer with built-in bridge rectifier. Supply voltage Vs=26V. Current consumption without load Ib=1.5A(typ). Activation voltage Von=12V(min),13.5V(max). Sustaining voltage Voff=7.8V(min),9.3V(max). in 8-pin DIP package. Operational temperature range from -20°C to 70°C. Datasheet*) There are other manufacturers for this components. For more information please check LS1240 (Fairchild Semiconductor) LS1240 (SGS-Thomson Microelectronics) LS1240 (Wing Shing Electronic Co.)

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