Features and Benefits
▪ Resistant to Physical Stress
▪ Superior Temperature Stability
▪ Output Short-Circuit Protection
▪ Operation From Unregulated Supply
▪ Reverse Battery Protection
▪ Solid-State Reliability
▪ Small Size
3-pin SOT89 3-pin SOT23W
(LT package) (LH package)
Not to scale
The A3240 Hall-effect switch is an extremely tempera-
ture-stable and stress-resistant sensor IC especially suited
for operation over extended temperature ranges to +150°C.
Superior high-temperature performance is made possible
through dynamic offset cancellation, which reduces the
residual offset voltage normally caused by device overmolding,
temperature dependencies, and thermal stress.
The device 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 will turn the output on. An on-board regulator
permits operation with supply voltages of 4.2 to 24 volts.
Three package styles provide a magnetically optimized package
for most applications. Package type LH is a modified SOT23W
surface-mount package, LT is a miniature SOT89/TO-243AA
transistor package for surface-mount applications; while UAis
a three-lead ultra-mini-SIPfor through-hole mounting. The LH
and UA packages are also available in a lead (Pb) free version
(suffix, –T) , with a 100% matte tin plated leadframe.
Functional Block Diagram