A1120

• Unipolar switchpoints
• Resistant to physical stress
• Superior temperature stability
• Output short-circuit protection
• Operation from unregulated supply
• Reverse battery protection
• Solid-state reliability
• Small package sizes

Description

The A1120 Hall-effect, unipolar switch is an extremely temperature-stable and stress-resistant sensor, especially suited for operation over extended temperature ranges to 150°C. Superior high-temperature performance is made possible through dynamic offset cancellation, A1120 reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress.

A1120 includes on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit protected open-collector output to sink up to 25 mA. A south pole of sufficient strength turns the output on. Removal of the magnetic field turns the output off.

An on-board regulator permits operation with supply voltages of 3 to 24 V. The advantage of operating down to 3 V is that the A1120 can be used in 3 V applications or with additional external resistance in series with the supply pin for greater protection against high voltage transient events.

Two package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W, surface mount package, while UA is a three-lead ultra-mini SIP for through-hole mounting. Each package type is lead (Pb) free (suffix, ), with a 100% matte tin plated leadframe.