LM1851

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications.
Supply Current.................................................... 19 mA
Power Dissipation (Note 1) ............................1250 mW
Operating Temperature Range ...............-40 to +70
Storage Temperature Range ................-55 to +150
Soldering Information
Dual-In-Line Package (10 sec.) ............................260
Small Outline Package
Vapor Phase (60 sec.) ..........................................215
Infrared (15 sec.) .................................................220
See AN-450 "Surface Mounting and Their Effects on Product Reliability'' for other methods of soldering surface mount devices.

The LM1851 is designed to provide ground fault protection for AC power outlets in consumer and industrial environments. Ground fault currents greater than a presettable threshold value will trigger an external SCR-driven circuit breaker to interrupt the AC line and remove the fault condition. In addition to detection of conventional hot wire to ground faults, the neutral fault condition is also detected. Full advantage of the U.S. UL943 timing specification is taken to insure maximum immunity to false triggering due to line noise. Special features include circuitry that rapidly resets the timing capacitor in the event that noise pulses introduce unwanted charging currents and a memory circuit that allows firing of even a sluggish breaker on either half-cycle of the line voltage when external full-wave rectification is used.