3280, 3281,
AND
3283
Suffix '–LT' & '–UA' Pinning
CHOPPER-STABILIZED, PRECISION
HALL-EFFECT LATCHES
The A3280--, A3281--, and A3283-- Hall-effect latches are ex-
tremely temperature-stable and stress-resistant sensors 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, temperature dependencies, and thermal stress.
The three devices are identical except for magnetic switch points.
Each 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. A north pole is necessary to turn the output off. 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 miniature
low-profile surface-mount package, ‘–LT’ is a miniature SOT-89/TO-
243AA transistor package for surface-mount applications; while suffix
‘–UA’ is a three-lead ultra-mini-SIP for through-hole mounting.
Data Sheet
27609.20
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
.......................
Internally Limited
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
OUTPUT
SUPPLY
FEATURES
I
I
I
I
I
I
I
I
Symmetrical Switch Points
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.,
A3281ELH .
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
