A1121LLHLX-TChopper-stabilized precision Hall-effect switch
A1220, A1121, A1122, A1123, and A1125Hall-effect unipolar switchIt is an extremely stable and pressure-resistant sensor IC over a wide range of temperatures, especially for operations up to 150°C. Dynamic offset cancellation ensures good performance at high temperatures, reducing residual offset voltages typically caused by device overmolding, temperature dependence, and thermal stress.
Each device contains the following components on a single silicon chip: voltage regulator, Hall generator, small signal amplifier, chopper-stabilized characteristics, Schmitt trigger, and an open-collector output with short-circuit protection that draws up to 25 mA.
The on-board regulator allows operation from a supply voltage of 3 to 24 V. The advantage of operating down to 3 V is that the device can be used in 3 V applications or can be connected in series with additional external resistors to the supply pins for greater protection against high voltage transients.
For the A1120, A1121, A1122, and A1123, the output can be turned on as long as the south pole has enough magnetic field. When there is no magnetic field, the output stops. The A1125 complements the A1120 and A1121, for which having a magnetic field at the south pole will turn off the output, while eliminating the south pole magnetic field will turn on the output.
Both package types provide magnetically optimized packages for most applications. The LH type package is an improved SOT23W surface mount package, while the UA is a three-pin ultra-small SIP for via mounting. Each package is lead (suffix –T) and the leadframe is 100% matte tin plating.
- Unipolar switching point
- Resistant to physical stress
- Excellent temperature stability
- Output short-circuit protection
- Can be operated from an unregulated power supply
- Reverse battery protection
- High reliability
- Small package size
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