A3121

Data Sheet 27621.4C* 3121, 3122, AND 3123 HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION X V CC 1 2 3 OUTPUT GROUND SUPPLY Dwg. PH-003A Pinning is shown viewed from branded side. ABSOLUTE MAXIMUM RATINGS at TA = +25°C Supply Voltage, V ........................... 30 V CC Reverse Battery Voltage, VRCC ........ -30 V Magnetic Flux Density, B ....... Unlimited Output OFF Voltage, VOUT ................ 28 V Reverse Output Voltage, V ........ -0.5 V OUT Continuous Output Current, IOUT ... 25 mA Operating Temperature Range, TA Suffix ‘E–’ ................. -40°C to +85°C Suffix ‘L–’ ............... -40°C to +150°C Storage Temperature Range, T .............................. S -65°C to +170°C These Hall-effect switches are monolithic integrated circuits with tighter magnetic specifications, designed to operate continuously over extended temperatures to +150°C, and are more stable with both temperature and supply voltage changes. The unipolar switching characteristic makes these devices ideal for use with a simple bar or rod magnet. The three basic devices (A3121, A3122, and A3123) are identical except for magnetic switch points. Each device includes a voltage regulator for operation with supply voltages of 4.5 volts to 24 volts, reverse battery protection diode, quadratic Hall-voltage generator, temperature compensation circuitry, smallsignal amplifier, Schmitt trigger, and an open-collector output to sink up to 25 mA. With suitable output pull up, they can...