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| 3161 Datasheet, PDF (1/8 Pages) Allegro MicroSystems – HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS | |||
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3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
This Hall-effect switch is a monolithic integrated circuit designed to
operate continuously over extended temperatures to +85°C. The unipo-
lar switching characteristic makes this device ideal for use with a simple
bar or rod magnet. The A3161ELT and A3161EUA are identical except
for package.
Each device includes a voltage regulator for operation with supply
voltages of 3.5 to 25 volts, reverse battery protection diode, quadratic
Hall-voltage generator, temperature compensation circuitry, small-signal
amplifier, Schmitt trigger, and a constant-current open-collector output.
Noise radiation is limited by control of the output current slew rate.
Two package styles provide a magnetically optimized package for
most applications. Suffix âLTâ is a miniature SOT-89/TO-243AA
transistor package for surface-mount applications; suffix âUAâ is a three-
lead ultra-mini SIP for through-hole mounting.
Dwg. PH-003-3
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VCC
Continuous ................................. 28 V
Surge (tw ⤠100 ms) .................... 40 V
Reverse Battery Voltage, VRCC
Continuous ................................ -25 V
Surge (tw ⤠100 ms) ................... -40 V
Magnetic Flux Density, B ....... Unlimited
Output OFF Voltage, VOUT .............. 28 V
Operating Temperature Range,
TA ............................. -40°C to +85°C
Storage Temperature Range,
TS ........................... -65°C to +170°C
FEATURES and BENEFITS
I Internal Current Regulator for 2-Wire Operation
I Output Slew Rate Controlled
I 3.5 V to 25 V Operation ⦠Needs Only An Unregulated Supply
I Reverse Battery Protection
I Excellent Temp. Stability
I Activate with Small, Commercially Available Permanent Magnets
I Small Size
I Solid-State Reliability ⦠No Moving Parts
I Resistant to Physical Stress
Always order by complete part number, e.g., A3161ELT .
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