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3121 Datasheet, PDF (1/8 Pages) Allegro MicroSystems – HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION | |||
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3121, 3122, AND
3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE OPERATION
V
CC
1
2
3
Dwg. PH-003A
Pinning is shown viewed from branded side.
These Hall-effect switches are monolithic integrated circuits with
tighter magnetic specifications, designed to operate continuously over
extended temperatures to +150°C, and are more stable with both tem-
perature and supply voltage changes. The unipolar switching character-
istic makes these devices ideal for use with a simple bar or rod magnet.
The three basic devices (3121, 3122, and 3123) are identical except for
magnetic switch points.
Each device includes a voltage regulator for operation with supply
voltages of 4.5 voltas to 24 volts, reverse battery protection diode,
quadratic Hall-voltage generator, temperature compensation circuitry,
small-signal amplifier, Schmitt trigger, and an open-collector output to
sink up to 25 mA. With suitable output pull up, they can be used with
bipolar or CMOS logic circuits. The 3121 is an improved replacement
for the 3113 and 3119.
The first character of the part number suffix determines the device
operating temperature range. Suffix âEââ is for the automotive and
industrial temperature range of -40°C to +85°C. Suffix âLââ is for the
automotive and military temperature range of -40°C to +150°C. Three
package styles provide a magnetically optimized package for most
applications. Suffix ââLTâ is a miniature SOT-89/TO-243AA transistor
package for surface-mount applications; suffix ââUâ is a three-lead
plastic mini-SIP while suffix ââUAâ is a three-lead ultra-mini-SIP.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, V ........................... 30 V
CC
Reverse Battery Voltage, VRCC ........ -30 V
Magnetic Flux Density, B ....... Unlimited
Output OFF Voltage, VOUT ................ 28 V
Reverse Output Voltage, V ........ -0.5 V
OUT
Continuous Output Current, IOUT ... 25 mA
Operating Temperature Range, TA
Suffix âEââ ................. -40°C to +85°C
Suffix âLââ ............... -40°C to +150°C
Storage Temperature Range,
T .............................. -65°C to +170°C
S
FEATURES and BENEFITS
I Superior Temp. Stability for Automotive or Industrial Applications
I 4.5 V to 24 V Operation ⦠Needs Only An Unregulated Supply
I Open-Collector 25 mA Output ⦠Compatible with Digital Logic
I Reverse Battery Protection
I Activate with Small, Commercially Available Permanent Magnets
I Solid-State Reliability ⦠No Moving Parts
I Small Size
I Resistant to Physical Stress
Always order by complete part number, e.g., A3121EU .
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