3195
PROTECTED, HIGH-TEMP.,
ACTIVE PULL-DOWN
HALL-EFFECT LATCH
3195
These Hall-effect latches are capable of sensing magnetic fields
while using an unprotected power supply. The A3195鈥?can provide
position and speed information by providing a digital output for mag-
netic fields that exceed their predefined switch points. These devices
operate down to zero speed and have switch points that are designed
to be extremely stable over a wide operating temperature and voltage
range. The latching characteristics make them ideal for use in pulse
counting applications when used with a multi-pole ring magnet.
A 25 mA high-side driver combined with an active pull-down is espe-
cially useful for driving capacitive loads. Output short-circuit protection
allows for an increased wiring harness fault tolerance. The tempera-
ture compensated switch points, the wide operating voltage range, and
the integrated protection make these devices ideal for use in automo-
tive applications such as transmission speed sensors and integrated
wheel bearing speed sensors.
Each monolithic device contains an integrated Hall-effect trans-
ducer, a temperature-compensated comparator, a voltage regulator,
and a buffered high-side driver with an active pull-down. Supply
protection is made possible by the integration of overvoltage shutdown
circuitry that monitors supply fault conditions. Output protection
circuitry includes source and sink current current limiting for short
circuits to supply or ground.
The A3195E鈥?is rated for operation over a temperature range of
-40擄C to +85擄C; the A3195L鈥?is rated for operation over an extended
temperature range of -40擄C to +150擄C. They are supplied in a three-
lead SIP (suffix 鈥揢) or a surface-mount SOT-89 (suffix 鈥揕T).
Data Sheet
27609.15*
PROTECTED, HIGH-TEMPERATURE,
HALL-EFFECT LATCH WITH ACTIVE PULL-DOWN
X
LATCH
V
CC
1
2
3
GROUND
Dwg. PH-013
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
(100 ms) ..........
115 V*
(continuous) ...................................
26 V
Reverse Battery Voltage,
V
RCC
(100 ms) ............................
-100 V
(continuous) .................................
-30 V
Magnetic Flux Density, B ...........
Unlimited
Reverse Output Voltage, V
OUT
.........
-0.5 V
Continuous Output Current,
I
OUT
...........................
Internally Limited
Package Power Dissipation,
P
D
........................................
See Graph
Junction Temperature, T
J
.................
170
擄
C
Operating Temperature Range, T
A
Suffix 鈥淓鈥撯€?....................
-40
擄
C to +85
擄
C
Suffix 鈥淟鈥撯€?..................
-40
擄
C to +150
擄
C
Storage Temperature, T
S
.................
170
擄
C
*Fault condition, internal overvoltage shutdown
above 28 V.
OUTPUT
SUPPLY
FEATURES
s
s
s
s
s
s
s
s
s
s
Internal Protection For Automotive (ISO/DIN) Transients
Operation From Unregulated Supply
Reverse Battery Protection
Undervoltage Lockout
Supply Noise-Suppression Circuitry
Output Short-Circuit Protection
Output Zener Clamp
Thermal Protection
Symmetrical Latching Switch Points
Operable with Multipole Ring Magnets
Always order by complete part number, e.g.,
A3195LU .
ALLEGRO
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