A3240
Chopper-Stabilized, Precision
Hall-Effect Switch
Features and Benefits
▪ Resistant to Physical Stress
▪ Superior Temperature Stability
▪ Output Short-Circuit Protection
▪ Operation From Unregulated Supply
▪ Reverse Battery Protection
▪ Solid-State Reliability
Description
The A3240 Hall-effect switch is an extremely tempera-
ture-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, which reduces the
residualoffsetvoltagenormallycausedbydeviceovermolding,
temperature dependencies, and thermal stress.
▪ Small Size
Thedeviceincludesonasinglesiliconchipavoltageregulator,
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
sufficientstrengthwillturntheoutputon. Anon-boardregulator
permits operation with supply voltages of 4.2 to 24 volts.
Packages:
Threepackagestylesprovideamagneticallyoptimizedpackage
formostapplications. PackagetypeLHisamodifiedSOT23W
surface-mount package, LT is a miniature SOT89/TO-243AA
transistorpackageforsurface-mountapplications;whileUAis
athree-leadultra-mini-SIPforthrough-holemounting.TheLH
and UA packages are also available in a lead (Pb) free version
(suffix, –T) , with a 100% matte tin plated leadframe.
3-pin SOT89
(LT package)
3-pin SOT23W
(LH package)
3-pin SIP
(UA package)
Not to scale
Functional Block Diagram
SUPPLY
TO ALL
SUBCIRCUITS
REG.
OUTPUT
X
CONTROL
CURRENT
LIMIT
<17
GROUND
Dwg. FH-020-1
27621.20g