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Resistant to physical stress
Superior temperature stability
Output short-circuit protection
Operation from unregulated supply
Reverse battery protection
Solid-state reliability
Small size
Description
The A3340 Hall effect switch is an extremely temperature-stable
and stress-resistant sensor especially suited for operation
over extended temperature ranges up to 150擄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 off. An on-board regulator
permits operation with supply voltages of 4.2 to 24 volts.
Packages: 3 pin SOT23W (suffix LH),
and 3 pin SIP (suffix UA)
Two package styles provide a magnetically optimized package
for most applications. Suffix LH is an SOT23W surface mount
package and while suffix UA is a three-lead ultramini SIP for
through hole mounting.
The A3340 complements the A3240, which offers the same
features, but with the opposite output polarity.
Not to scale
Functional Block Diagram
VCC
Regulator
To All Subcircuits
Sample and Hold
Dynamic Offset
Cancellation
VOUT
Amp
Amp
Control
Current Limit
<1
GND
A3340-DS, Rev. 1