A3241 Datasheet, PDF (1/12 Pages) Allegro MicroSystems – Chopper-Stabilized Unipolar Hall-Effect Switches

A3241 and A3242
Package LH, 3-pin Surface Mount
3
1
3
2
1
2
Package UA, 3-pin SIP
1
2
3
Chopper-Stabilized
Unipolar Hall-Effect Switches
The A3241 and A3242 integrated circuits are unipolar Hall-effect switches with
digital outputs. These sensors are suited for operation over extended temperature
ranges, up to +150°C. Superior high-temperature performance is made pos-
sible through an Allegro^® patented dynamic offset cancellation, which reduces
the residual offset voltage normally caused by device overmolding, temperature
excursions, and thermal stress.
The A3241 and A3242 Hall-effect switches include the following on a single
silicon chip: voltage regulator, Hall-voltage generator, small-signal amplifier,
chopper stabilization, Schmitt trigger, and a short circuit protected open-drain
output. Advanced BiCMOS wafer fabrication processing is used to take advantage
of low-voltage requirements, component matching, very low input-offset errors,
and small component geometries.
The integrated voltage regulator permits operation from 3.6 to 24 V. The unipolar
family members operate with a sufficient south polarity field only, turning off in
the absence of such a south polarity field.
The A3241 and A3242 are rated for operation between the ambient temperatures
–40°C and 85°C for the E temperature range, and –40°C to 150°C for the L tem-
perature range. The small geometries of the BiCMOS process allow these devices
to be provided in ultrasmall packages. The package styles available provide mag-
netically optimized solutions for most applications. Package LH is an SOT23W,
a miniature low-profile surface-mount package, while package UA is a three-lead
ultramini SIP for through-hole mounting. Each package is available in a lead (Pb)
free version, with 100% matte tin plated leadframes.
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ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V_CC .......................................... 28 V
Reverse-Supply Voltage, V_RCC ........................ –18 V
Reverse-Supply Current, I_RCC ........................–2 mA
Output Off Voltage, V_OUT.................................. 28 V
Output Current, I_OUTSINK........... Internally Limited
Magnetic Flux Density, B .........................Unlimited
Operating Temperature
Ambient, T_A, Range E.................. –40ºC to 85ºC
Ambient, T_A, Range L................ –40ºC to 150ºC
Maximum Junction, T_J(MAX)......................165ºC
Storage Temperature, T_S .................. –65ºC to 170ºC
Features and Benefits
Chopper stabilization
Superior temperature stability
Extremely low switchpoint drift
Insensitive to physical stress
Reverse battery protection
A3241-DS, Rev. 2
Output short circuit protection
Solid state reliability
Small size
Robust EMC capability
High ESD ratings (HBM)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com