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Hall-Effect Switches. A3245 Datasheet

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Hall-Effect Switches. A3245 Datasheet






A3245 Switches. Datasheet pdf. Equivalent




A3245 Switches. Datasheet pdf. Equivalent





Part

A3245

Description

Chopper-Stabilized Omnipolar Hall-Effect Switches



Feature


A3245 Chopper-Stabilized Omnipolar Hall -Effect Switches Features and Benefits ▪ Omnipolar operation ▪ Chopper sta bilization ▫ Superior temperature sta bility ▫ Extremely low switchpoint dr ift ▫ Insensitive to physical stress ▪ Reverse battery protection ▪ Outp ut short circuit protection ▪ Solid s tate reliability ▪ Small size ▪ Rob ust EMC capability ▪ High ESD ratings .
Manufacture

Allegro MicroSystems

Datasheet
Download A3245 Datasheet


Allegro MicroSystems A3245

A3245; (HBM) Description The A3245 integrated circuit is an omnipolar, ultrasensitive Hall-effect switch with a digital outp ut. This sensor has an integrated regul ator permitting operation to 24 V, maki ng it the first omnipolar switch availa ble for operation to 24 V. This device is especially suited for operation over extended temperature ranges, up to +15 0°C. Superior high.


Allegro MicroSystems A3245

-temperature performance is made possibl e through an Allegro® patented dynamic offset cancellation, which reduces the residual offset voltage normally cause d by device overmolding, temperature ex cursions, and thermal stress. The A3245 Hall-effect switch includes the follow ing on a single silicon chip: voltage r egulator, Hall-voltage generator, small signal amplifier, c.


Allegro MicroSystems A3245

hopper stabilization, Schmitt trigger, a nd a short circuit protected open-drain output. Advanced BiCMOS wafer fabricat ion processing is used to take advantag e of lowvoltage requirements, component matching, very low inputoffset errors, and small component geometries. Packa ges: 3 pin SOT23W (suffix LH), and 3 pi n SIP (suffix UA) The omnipolar operat ion of the A3245 a.

Part

A3245

Description

Chopper-Stabilized Omnipolar Hall-Effect Switches



Feature


A3245 Chopper-Stabilized Omnipolar Hall -Effect Switches Features and Benefits ▪ Omnipolar operation ▪ Chopper sta bilization ▫ Superior temperature sta bility ▫ Extremely low switchpoint dr ift ▫ Insensitive to physical stress ▪ Reverse battery protection ▪ Outp ut short circuit protection ▪ Solid s tate reliability ▪ Small size ▪ Rob ust EMC capability ▪ High ESD ratings .
Manufacture

Allegro MicroSystems

Datasheet
Download A3245 Datasheet




 A3245
A3245
Chopper-Stabilized Omnipolar Hall-Effect Switches
Features and Benefits
Omnipolar operation
Chopper stabilization
Superior temperature stability
Extremely low switchpoint drift
Insensitive to physical stress
Reverse battery protection
Output short circuit protection
Solid state reliability
Small size
Robust EMC capability
High ESD ratings (HBM)
Packages: 3 pin SOT23W (suffix LH)
Description
The A3245 integrated circuit is an omnipolar, ultrasensitive
Hall-effect switch with a digital output. This device has an
integrated regulator permitting operation to 24 V, making
it the first omnipolar switch available for operation to 24 V.
This device is especially suited for operation over extended
temperature ranges, up to +150°C. Superior high-temperature
performance is made possible through an Allegro® patented
dynamic offset cancellation, which reduces the residual offset
voltage normally caused by device overmolding, temperature
excursions, and thermal stress.
The A3245 Hall-effect switch includes 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 omnipolar operation of the A3245 allows activation with
either a north or a south polarity field of sufficient strength.
In the absence of a magnetic field, the output is off. This
Not to scale
VCC
Continued on the next page…
Functional Block Diagram
Amp
Amp
Regulator
To All Subcircuits
Control
Current Limit
VOUT
<1Ω
A3245-DS, Rev. 12
GND




 A3245
A3245
Chopper-Stabilized Omnipolar Hall Effect Switches
Description (continued)
patented magnetic-polarity-independence feature makes this device
an excellent replacement for reed switches, with improved ease of
manufacturing, because the A3245 does not require manufacturers
to orient their magnets. These devices allow simple on/off switching
in industrial, consumer, and automotive applications.
TheA3245 is 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 temperature range. The small geometries of the BiCMOS
process allow these devices to be provided in ultrasmall packages.
Package LH is an SOT23W, a miniature low-profile surface-
mount package. It is lead (Pb) free, with 100% matte tin plated
leadframe.
Selection Guide
Part Number
Packing*
A3245ELHLT-T 7-in. reel, 3000 pieces/reel
A3245LLHLT-T 7-in. reel, 3000 pieces/reel
*Contact Allegro for additional packing options.
Mounting
3-pin SOT23W surface mount
3-pin SOT23W surface mount
Ambient, TA (°C)
–40 to 85
–40 to 150
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse-Supply Voltage
Reverse-Supply Current
Output Off Voltage
Output Current
Magnetic Flux Density
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VCC
VRCC
IRCC
VOUT
IOUTSINK
B
TA
TJ(max)
Tstg
Range E
Range L
Notes
Rating
28
–18
–2
28
Internally Limited
Unlimited
–40 to 85
–40 to 150
165
–65 to 170
Units
V
V
mA
V
G
ºC
ºC
ºC
ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
2




 A3245
A3245
Chopper-Stabilized Omnipolar Hall Effect Switches
OPERATING CHARACTERISTICS valid over full operating voltage and ambient temperature ranges, unless otherwise noted
Characteristic
Symbol
Test Conditions
Min. Typ. Max. Units
Electrical Characteristics
Supply Voltage1
Output Leakage Current
Output On Voltage
Output Current Limit
Power-On Time
Chopping Frequency
Output Rise Time2
Output Fall Time2
Supply Current
Reverse Battery Current
Supply Zener Clamp Voltage
Supply Zener Current3
Magnetic Characteristics4
VCC
IOUTOFF
VOUT(SAT)
IOM
tPO
fc
tr
tf
ICCON
ICCOFF
IRCC
VZSupply
IZSupply
Operating, TJ < 165°C
VOUT = 24 V, B < BRP
IOUT = 20 mA, B > BOP
B > BOP
VCC > VCC(MIN)
RLOAD = 820 Ω, CS = 20 pF
RLOAD = 820 Ω, CS = 20 pF
B > BOP
B < BRP
VRCC = –18 V
ICC = 6.5 mA; TA = 25°C
VS = 28 V
3.6 – 24 V
– – 10 μA
– – 500 mV
30 – 60 mA
– – 50 μs
– 200 – kHz
– – 1 μs
– – 1 μs
– 1.5 3.5 mA
– 1.5 3.5 mA
– – –2 mA
28 – – V
– – 6.5 mA
Operate Point
BOPS
BOPN
South pole adjacent to branded face of device
North pole adjacent to branded face of device
15 38 55
–55 –38 –15
G
G
Release Point
BRPS
BRPN
South pole adjacent to branded face of device
North pole adjacent to branded face of device
5 20
–50 –20
50
–5
G
G
Hysteresis
BHYS
|BOPX – BRPX|
5 18 30 G
1 Maximum voltage must be adjusted for power dissipation and junction temperature, see Power Derating section.
2 CS = oscilloscope probe capacitance.
3 Maximum current limit is equal to the maximum ICC(MAX) + 3 mA.
4 Magnetic ux density, B, is indicated as a negative value for north-polarity magnetic elds, and as a positive value for south-polarity magnetic elds.
This so-called algebraic convention supports arithmetic comparison of north and south polarity values, where the relative strength of the eld is indicated
by the absolute value of B, and the sign indicates the polarity of the eld (for example, a –100 G eld and a 100 G eld have equivalent strength, but
opposite polarity).
DEVICE QUALIFICATION PROGRAM
Contact Allegro for information.
EMC (Electromagnetic Compatibility) REQUIREMENTS
Contact Allegro for information.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
3






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