A3121

This is the description about A3121, A3122, and A3123 of the hall-effect switches for high-temperature operation.

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 be used with bipolar or CMOS logic circuits. The A3121 is an improved replacement for the UGx3113 and UGx3119.

The first character of the part number suffix determines the device operating temperature range. Suffix 'E' is for the automotive and industrial temperature range of -40°C to +85°C. Suffix 'L' is for the automotive and military temperature range of -40°C to +150°C. Three package styles provide a magnetically optimized package for most applications. Suffix 'LT' is a miniature SOT89/TO-243AA transistor package for surface-mount applications; suffix 'U' is a three-lead plastic mini-SIP while suffix 'UA' is a three-lead ultra-mini-SIP.

Here are the features. (1) Superior Temp. Stability for Automotive or Industrial Applications; (2) 4.5 V to 24 V Operation . Needs Only An Unregulated Supply; (3) Open-Collector 25 mA Output . Compatible with Digital Logic; (4) Reverse Battery Protection; (5) Resistant to Physical Stress; (6) small size.

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