A1242ELHLT-I1-T Allegro Microsystems Inc, A1242ELHLT-I1-T Datasheet - Page 2

• Manufacturer Part Number: A1242ELHLT-I1-T
• Description: IC LATCH HALL EFFECT SOT23W
• Manufacturer: Allegro Microsystems Inc
• Type: Unipolar Switchr

Specifications of A1242ELHLT-I1-T

• Package / Case: SOT-23W
• Sensing Range: 80G Trip, -80G Release
• Voltage - Supply: 3.5 V ~ 24 V
• Current - Supply: 6.9mA
• Output Type: Digital, Open Drain
• Features: Regulated Voltage
• Operating Temperature: -40°C ~ 85°C
• Peak Reflow Compatible (260 C): Yes
• Termination Type: SMD
• Supply Voltage Max: 24V
• No. Of Pins: 3
• Hall Effect Type: Latching
• Supply Voltage Min: 3.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output (max): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Features and Benefits
▪ Chopper stabilization
▪ Reverse battery protection
▪ Solid-state reliability
▪ Small size
▪ Robust EMC capability
▪ High ESD ratings (HBM)
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Not to scale
Not to scale
1242-DS, Rev. 6
▫ Superior temperature stability
▫ Extremely low switchpoint drift
▫ Insensitive to physical stress
VCC
Two-Wire Chopper-Stabilized Hall Effect Latch
Functional Block Diagram
Clock/Logic
Amp
Low-Pass
Filter
Regulator
Description
The A1242 Hall effect latch is a two-wire latch especially
suited for operation over extended temperature ranges, from
–40 to +150°C. Superior high-temperature performance is
made possible through the Allegro
cancellation technique, which reduces the residual offset
voltage normally caused by device overmolding, temperature
dependencies, and thermal stress.
The current-switching output technique allows for the reduction
in cost in the wiring harness because only two connections to
the device are required. The current-switching output structure
also inherently provides more immunity against EMC/ESD
transients. These devices have low magnetic thresholds, thereby
enabling more flexibility in the magnetic circuit design.
The Hall effect latch will be in the high output current state
in the presence of a magnetic South Pole field of sufficient
magnitude and will remain in this state until a sufficient North
Pole field is present.
The A1242 includes the following on a single silicon chip:
a voltage regulator, Hall-voltage generator, small-signal
amplifier, chopper stabilization, Schmitt trigger, and a current
source output. Advanced BiCMOS wafer fabrication processing
takes advantage of low-voltage requirements, component
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To All Subcircuits
Package UA Only
GND
GND
®
patented dynamic offset
A1242