Hall-Effect Latch. A1245 Datasheet

A1245 Latch. Datasheet pdf. Equivalent


Part A1245
Description Two Wire Hall-Effect Latch
Feature A1245 Chopper-Stabilized Two-Wire Hall-Effect Latch FEATURES AND BENEFITS • High speed, 4-phase ch.
Manufacture Allegro MicroSystems
Datasheet
Download A1245 Datasheet


A1245 Chopper-Stabilized Two-Wire Hall-Effect Latch FEATURE A1245 Datasheet
Recommendation Recommendation Datasheet A1245 Datasheet




A1245
A1245
Chopper-Stabilized Two-Wire Hall-Effect Latch
FEATURES AND BENEFITS
• High speed, 4-phase chopper stabilization
□Low switchpoint drift throughout temperature range
□Low sensitivity to thermal and mechanical stresses
• On-chip protection
□Supply transient protection
□Reverse battery protection
• On-board voltage regulator
□3.0 to 24 V operation
• Operation up to 175°C junction temperature
• Solid-state reliability
• Industry-leading ISO 7637-2 performance through use of
proprietary, 40 V clamping structures
PACKAGES
Not to scale
3-pin ultramini SIP
1.5 × 4 × 3 mm
(suffix UA)
3-pin SOT23-W
2 × 3 × 1 mm
(suffix LH)
DESCRIPTION
The A1245 is a two-wire Hall-effect latch. The device is
produced on theAllegroadvanced BiCMOS wafer fabrication
process, which implements a high frequency, 4-phase,
chopper-stabilization technique. This technique achieves
magnetic stability over the full operating temperature range,
and eliminates offsets inherent in devices with a single Hall
element that are exposed to harsh application environments.
Two-wire latches are particularly advantageous in cost-sensitive
applications because they require one less wire for operation
versus the more traditional open-collector output switches.
Additionally, the system designer inherently gains diagnostics
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 condition.
The Hall-effect latch will be in the high output current state
in the presence of a magnetic south polarity field of sufficient
magnitude and will remain in this state until a sufficient north
polarity field is present.
The device is offered in two package styles. The LH is a
SOT-23W style, miniature low profile package for surface-
mount applications. The UA is a 3-pin ultra-mini single inline
packages (SIP) for through-hole mounting. Both packages are
lead (Pb) free, with 100% matte tin leadframe plating.
VCC
V+
Regulator
To all subcircuits
Clock/Logic
Amp
Low-Pass
Filter
Schmitt
Trigger
Polarity
A1245-DS, Rev. 4
MCO-0000331
GND
UA package only
Functional Block Diagram
GND
January 20, 2020



A1245
A1245
Chopper-Stabilized Two-Wire Hall-Effect Latch
SELECTION GUIDE
Part Number
Packing [1]
Package
A1245LLHLX-I1-T
A1245LLHLX-I2-T
A1245LUA-I1-T
A1245LUA-I2-T
13-in. reel, 10000 pieces/reel
13-in. reel, 10000 pieces/reel
Bulk, 500 pieces/bag
Bulk, 500 pieces/bag
[1] Contact Allegro for additional packing options
3-pin SOT23W surface mount
3-pin SOT23W surface mount
3-pin SIP through hole
3-pin SIP through hole
Operating Ambient
Temperature, TA
(°C)
–40 to 150
–40 to 150
–40 to 150
–40 to 150
Supply Current
at ICC(L)
(mA)
5 to 6.9
2 to 5
5 to 6.9
2 to 5
RoHS
COMPLIANT
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Forward Supply Voltage [2]
Reverse Supply Voltage [2]
Magnetic Flux Density
VCC
VRCC
B
Operating Ambient Temperature
TA
Maximum Junction Temperature
TJ(max)
Storage Temperature
Tstg
Range L
For 500 hours
Notes
Rating
28
–18
Unlimited
–40 to 150
165
175
–65 to 170
Unit
V
V
G
°C
°C
°C
°C
[2] This rating does not apply to extremely short voltage transients such as load dump and/or ESD. Those events have individual ratings, specific to the
respective transient voltage event.
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
2







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