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.
3
Data Sheet
27621.20d
X
PTCT
V
CC
1
2
Three package styles provide a magnetically optimized package for
most applications. Package type LH is a modified SOT23W surface-
mount package, LT is a miniature SOT89/TO-243AA transistor package
for surface-mount applications; while UA is a three-lead ultra-mini-SIP
for through-hole mounting. The LH and UA packages are also available
in a lead (Pb) free version (suffix,
–T)
, with a 100% matte tin plated
leadframe.
GROUND
SUPPLY
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
................
+165°C
Operating Temperature Range, T
A
Range ‘E’ .....................
-40°C to +85°C
Range ‘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
FEATURES
■
■
■
■
■
■
■
Resistant to Physical Stress
Superior Temperature Stability
Output Short-Circuit Protection
Operation From Unregulated Supply
Reverse Battery Protection
Solid-State Reliability
Small Size
3240
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH
Product Selection Guide
Part Number
A3240ELHLT-T
A3240EUA-T
A3240LLHLT-T
A3240LUA-T
1
Pb-based
Pb-free
1
Yes
Yes
Yes
Yes
Packing
2
Mounting
Ambient, T
A
(ºC)
–40 to 85
B
RP(MIN)
(G)
B
OP(MAX)
(G)
7-in. reel, 3000 pieces/reel Surface Mount
Bulk, 500 pieces/bag
Bulk, 500 pieces/bag
SIP through hole
SIP through hole
7-in. reel, 3000 pieces/reel Surface Mount
5.0
–40 to 150
50
variants are being phased out of the product line. Certain variants cited in this footnote are in production but have been
determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer
applications. The device should not be purchased for new design applications because obsolescence in the near future is probable.
Samples are no longer available. Status change: May 1, 2006. These variants include: A3240ELHLT, A3240ELT, A3240ELTTR, A3240EUA,
A3240LLHLT, A3240LLT, A3240LLTTR, and A3240LUA.
2
Contact Allegro for additional packing options.
www.allegromicro.com
2
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
< 165°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).
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4
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