3280, 3281,
AND
3283
Suffix '–LT' & '–UA' Pinning
(SOT89/TO-243AA & ultra-mini SIP)
CHOPPER-STABILIZED, PRECISION
HALL-EFFECT LATCHES
The A3280--, A3281--, and A3283-- Hall-effect latches are extremely
temperature-stable and stress-resistant sensors especially suited for op-
eration over extended temperature ranges to +150°C. Superior high-tem-
perature performance is made possible through dynamic offset cancella-
tion, 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 regula-
tor permits operation with supply voltages of 4.2 to 24 volts.
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. Each package type is also available in a lead
(Pb) free version (suffix,
–T)
, with a 100% matte tin plated leadframe.
Data Sheet
27609.20e
X
PTCT
V
CC
1
2
3
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
■
■
■
■
■
■
■
■
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
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
