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A1148LLHLT Datasheet

  • A1148LLHLT

  • Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipo...

  • 13頁

  • ALLEGRO   ALLEGRO

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A1147 and A1148
Low Current Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
The A1147 and A1148 devices are two-wire, unipolar, Hall effect switches that are
factory-programmed at end-of-line to optimize ultrasensitive magnetic switchpoint
accuracy. These devices use a patented high frequency chopper-stabilization tech-
nique, produced using the Allegro advanced BiCMOS wafer fabrication process,
to achieve magnetic stability and to eliminate offset inherent in single-element
devices exposed to harsh application environments.
鈮?:1
Package LH, 3-pin SOT
Package UA, 3-pin SIP
Commonly found in a number of automotive applications, these switches are
utilized to sense seat track position, seat belt buckle presence, hood/trunk latch-
ing, and shift selector position. Two-wire unipolar switches, such as the A1147
and A1148, are particularly advantageous in price-sensitive applications because
they require one less wire for operation than do switches with the more traditional
open-collector output. Additionally, the system designer inherently gains diagnos-
tics because there is always output current flowing, which should be in either of
two narrow ranges. Any current level not within these ranges indicates a fault con-
dition. These devices also feature on-chip transient protection and a Zener clamp
to protect against overvoltage conditions on the supply line.
The output currents of the A1148 switches HIGH in the presence of a south (+)
polarity magnetic field of sufficient strength, and switches LOW otherwise, as in
the presence of a weak field or a north (鈥? polarity field. The A1147 has an oppo-
site output: the currents switch LOW in the presence of a south-polarity magnetic
field of sufficient strength, and switch HIGH otherwise.
Both versions are offered in two package styles. The LH is a SOT-23W, miniature
low-profile package for surface-mount applications. The UA is a three-lead ultra-
mini SIP for through-hole mounting. Each package is available in a lead (Pb) free
version (suffix,
鈥揟)
with 100% matte tin plated leadframe. Field-programmable
versions also available: A1180 and A1181.
鈮?:1
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
..........................................
28 V
Reverse-Supply Voltage, V
RCC
........................
鈥?8 V
Magnetic Flux Density, B .........................Unlimited
Power Dissipation, P
D
............................
Graph, p. 5
Operating Temperature
Ambient, T
A
, Range E..................
鈥?0潞C to 85潞C
Ambient, T
A
, Range L................
鈥?0潞C to 150潞C
Maximum Junction, T
J(max)
........................165潞C
Storage Temperature, T
S
..................
鈥?5潞C to 170潞C
Features and Benefits
Chopper stabilization
Low switchpoint drift over operating
temperature range
Low sensitivity to stress
Factory programmed at end-of-line for
optimized switchpoints
On-chip protection
Supply transient protection
Reverse-battery protection
On-board voltage regulator
3.5 to 24 V operation
A1147-DS, Rev. 6
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

A1148LLHLT 產(chǎn)品屬性

  • Current Sensor

  • 3,000

  • 傳感器，轉(zhuǎn)換器

  • 磁性 - 霍爾效應，數(shù)字式開關，線性，羅盤 (IC)

  • -

  • 80G 跳閘，10G 釋放

  • 單極開關

  • 3.5 V ~ 24 V

  • 5mA

  • -

  • 數(shù)字，開路集電極

  • 穩(wěn)壓電壓

  • -40°C ~ 150°C

  • SOT-23W

  • SOT-23W

  • 帶卷 (TR)

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