3240
Suffix ‘–LT’ & ‘–UA’ Pinning
(SOT89/TO-243AA & ultra-min SIP)
CHOPPER-STABILIZED, PRECISION
HALL-EFFECT SWITCH
The A3240-- Hall-effect switch is an extremely temperature-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
residual offset voltage normally caused by device overmolding, tempera-
ture 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 on. An on-board regulator permits operation with supply voltages
of 4.2 to 24 volts.
The first character of the part number suffix determines the device
operating temperature range; suffix ‘E–’ is for -40°C to +85°C and
‘L–’ is -40°C to +150°C. Three package styles provide a magnetically
optimized package for most applications. Suffix ‘–LH’ is a modified
SOT23W surface-mount package, ‘–LT’ is a miniature SOT89/TO-
243AA transistor package for surface-mount applications; while suffix
‘–UA’ is a three-lead ultra-mini-SIP for through-hole mounting.
Data Sheet
27621.20§
X
PTCT
V
CC
1
2
3
GROUND
Dwg. PH-003-2
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
C
Supply Voltage, V
CC
........................
26.5 V
Reverse Battery Voltage, V
RCC
..........
-30 V
Magnetic Flux Density, B ...........
Unlimited
Output OFF Voltage, V
OUT
.................
26 V
Continuous Output Current,
I
OUT
..........................................
25 mA*
Reverse Output Current, I
OUT
........
-50 mA
Package Power Dissipation, P
D
.
See Graph
Junction Temperature, T
J
...............
+170
°
C
Operating Temperature Range, T
A
Suffix ‘E–’ ..................
-40
°
C to +85
°
C
Suffix ‘L–’ ................
-40
°
C to +150
°
C
Storage Temperature Range,
T
S
..............................
-65
°
C to +170
°
C
*Internal current limiting is intended to protect
the device from output short circuits.
OUTPUT
SUPPLY
FEATURES
s
s
s
s
s
s
s
Resistant to Physical Stress
Superior Temperature Stability
Output Short-Circuit Protection
Operation From Unregulated Supply
Reverse Battery Protection
Solid-State Reliability
Small Size
Always order by complete part number: the prefix ‘A’ + the basic four-
digit part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g.,
A3240ELH .
3240
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits
Characteristic
Supply Voltage Range
Output Leakage Current
Output Saturation Voltage
Output Current Limit
Power-On Time
Chopping Frequency
Output Rise Time
Output Fall Time
Supply Current
Symbol
V
CC
I
OFF
V
OUT(SAT)
I
OM
t
po
f
C
t
r
t
f
I
CC
R
L
= 820
Ω,
C
L
= 20 pF
R
L
= 820
Ω,
C
L
= 20 pF
B < B
RP
, V
CC
= 12 V
B > B
OP
, V
CC
= 12 V
Reverse Battery Current
Zener Voltage
Zener Impedance
I
CC
V
Z
+ V
D
z
z
+ z
D
V
RCC
= -30 V
I
CC
= 15 mA, T
A
= 25°C
I
CC
= 15 mA, T
A
= 25°C
Test Conditions
Operating, T
J
< 170°C
1
V
OUT
= 24 V, B < B
RP
I
OUT
= 20 mA, B > B
OP
B > B
OP
V
CC
> 4.2 V
Min.
4.2
–
–
30
–
–
–
–
–
–
–
28
–
Typ.
–
–
185
–
–
340
0.2
0.1
3.0
4.0
–
32
50
Max.
24
10
500
60
50
–
2.0
2.0
6.0
6.0
-5.0
37
–
Units
V
µA
mV
mA
µs
kHz
µs
µs
mA
mA
mA
V
Ω
NOTES:1. Maximum voltage must be adjusted for power dissipation and junction temperature.
2. B
OP
= operate point (output turns on); B
RP
= release point (output turns off).
3. Typical Data is at T
A
= +25°C and V
CC
= 12 V and is for design information only.
MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.
Limits
Characteristic
Operate Point
Release Point
Hysteresis
Symbol
B
OP
B
RP
B
hys
B
OP
- B
RP
Test Conditions
Min.
–
5.0
–
Typ.
35
25
10
Max.
50
–
–
Units
G
G
G
NOTES: 1. Typical Data is at T
A
= +25°C and V
CC
= 12 V and is for design information only.
2. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
www.allegromicro.com
3
京公网安备 11010802033920号
EEWORLD
