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A3250LUA-T Datasheet(PDF) 3 Page - Allegro MicroSystems

Part # A3250LUA-T
Description  Field-Programmable, Chopper-Stabilized Unipolar Hall-Effect Switches
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A3250LUA-T Datasheet(HTML) 3 Page - Allegro MicroSystems

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Field-Programmable, Chopper-Stabilized,
Unipolar Hall-Effect Switches
A3250 and
A3251
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
OPERATING CHARACTERISTICS
valid over operating TA and VCC, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
ELECTRICAL CHARACTERISTICS
Supply Voltage1
VCC
Running mode
4.2
24
V
Output Saturation Voltage
VOUT(sat)
IOUT = 20 mA; Switch state = ON
175
400
mV
Output Leakage Current
IOFF
VOUT = 24 V; Switch state = OFF
10
μA
Supply Current
ICC(off)
A3250; B < BRP; VOUT = HIGH
4.0
7.0
mA
A3251; B > BOP; VOUT = HIGH
4.0
7.0
mA
ICC(on)
A3250; B > BOP; VOUT = LOW
6.0
10.0
mA
A3251; B < BRP; VOUT = LOW
6.0
10.0
mA
Output Rise Time
tr
RLOAD = 820 Ω, CLOAD = 10 pF
5.0
μs
Output Fall Time
tf
RLOAD = 820 Ω, CLOAD = 10 pF
5.0
μs
Chopping Frequency
fC
340
kHz
Power-Up Time
ton
VOUT = HIGH
20
50
μs
Output Current Limit1,2
IOUT(lim)
Short-circuit protection
60
90
120
mA
Power-On State
POS
A3250; B < BRP, t > ton
HIGH
mV
A3251; B < BRP, t > ton
LOW
mV
MAGNETIC CHARACTERISTICS
Initial Operate Point
BOP
–20
13
50
G
Temperature Drift of BOP
ΔBOP
BOP ≤ 500 gauss
–35
35
G
Hysteresis (BOP – BRP)Bhys
Package TA range = J
5.0
18
35
G
Package TA range = L
5.0
13
35
G
PROGRAMMING CHARACTERISTICS
Programmable BOP Values3
BOP(prog)
50
≥350
G
Number of Programming Bits
Switchpoint set
6
Bit
Programming lock
1
Bit
Resolution
BRES
7.0
G
TRANSIENT PROTECTION CHARACTERISTICS
Supply Zener Voltage
VZ
28
V
Supply Zener Current
IZ
VCC = 28 V
13
mA
Reverse Battery Current
IRCC
VRCC = –18 V, TJ < TJ(max)
–5.0
mA
1 Do not exceed TJ(max): Additional information on power derating is provided in the applications section.
2 Short-circuit protection is not intended for continuous operation; permanent damage may result.
3 Device can be used below 50 G but is not guaranteed to be a unipolar switch. It is the responsibility of the programmer to verify that the desired
switchpoint has been achieved.


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