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A1242
Two-Wire Chopper-Stabilized Hall Effect Latch
Discontinued Product
This device is no longer in production. The device should not be
purchased for new design applications. Samples are no longer available.
Date of status change: October 31, 2011
Recommended Substitutions:
• for the A1242ELHLT-I2-T use the A1244LLHLX-I2-T
• for the A1242ELHLT-I1-T use the A1244LLHLX-I1-T
• for the A1242LLHLT-I2-T use the A1244LLHLX-I2-T
• for the A1242LLHLT-I1-T use the A1244LLHLX-I1-T
• for the A1242EUA-I1-T and A1242LUA-I1-T use the A1244LUA-I1-T
• for the A1242LUA-I2-T use the A1244LUA-I2-T
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no respon-
sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
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A1242
Two-Wire Chopper-Stabilized Hall Effect Latch
Features and Benefits
Chopper stabilization
Superior temperature stability
Extremely low switchpoint drift
Insensitive to physical stress
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)
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® patented dynamic offset
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
Not to scale
Continued on the next page…
Functional Block Diagram
VCC
Clock/Logic
Amp
Regulator
To All Subcircuits
Low-Pass
Filter
1242-DS, Rev. 6
GND
Package UA Only
GND
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A1242
Two-Wire Chopper-Stabilized Hall Effect Latch
Description (continued)
matching, very low input-offset errors and small component
geometries.
Suffix ‘L-’ devices are rated for operation over a temperature range
of –40°C to +150°C; suffix ‘E-’ devices are rated for operation over
a temperature range of –40°C to +85°C. Two A1242 package styles
provide magnetically optimized solutions for most applications.
Package LH is a SOT23W, a miniature low-profile surface-mount
package, while package UA is a three-pin ultramini SIP for through-
hole mounting. Each package is available lead (Pb) free, with 100%
matte tin plated leadframes.
Selection Guide
Part Number
Packaging*
A1242ELHLT-I1-T
A1242ELHLT-I2-T
7-in. reel, 3000 pieces/reel
A1242EUA-I1-T
Bulk, 500 pieces/bag
A1242LLHLT-I1-T
A1242LLHLT-I2-T
7-in. reel, 3000 pieces/reel
A1242LUA-I1-T
A1242LUA-I2-T
Bulk, 500 pieces/bag
*Contact Allegro for additional packing options.
Mounting
3-pin SOT23W surface mount
3-pin SIP through hole
3-pin SOT23W surface mount
3-pin SIP through hole
Low Current, ICC(L)
(mA)
5.0 to 6.9
2.0 to 5.0
5.0 to 6.9
5.0 to 6.9
2.0 to 5.0
5.0 to 6.9
2.0 to 5.0
Ambient, TA
(°C)
–40 to 85
–40 to 150
BRP(MIN)
(G)
–80
BOP(MAX)
(G)
80
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Magnetic Flux Density
Symbol
VCC
VRCC
B
Operating Ambient Temperature
TA
Maximum Junction Temperature
Storage Temperature
*1 G (gauss) = 0.1 mT (millitesla)
TJ(max)
Tstg
Pin-out Diagrams
LH Package
UA Package
3
NC
12
123
Notes
Range E
Range L
Rating
28
–18
Unlimited
–40 to 85
–40 to 150
165
–65 to 170
Unit*
V
V
G
ºC
ºC
ºC
ºC
Terminal List
Name
VCC
Number
Package LH Package UA
Function
1 1 Connects power supply to chip
GND
3
2,3 Ground
NC 2
– No internal connection
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
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