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3185

Allegro MicroSystems
Part Number 3185
Manufacturer Allegro MicroSystems
Description HALL-EFFECT LATCHES
Published Mar 30, 2005
Detailed Description 3185 THRU 3189 HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION These Hall-effect latches are extremely temperature-s...
Datasheet PDF File 3185 PDF File

3185
3185

Overview
3185 THRU 3189 HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION These Hall-effect latches are extremely temperature-stable and stressresistant sensors especially suited for operation over extended temperature ranges to +150°C.
Superior high-temperature performance is made possible through a novel Schmitt trigger circuit that maintains operate and release point symmetry by compensating for temperature changes in the Hall element.
Additionally, internal compensation provides magnetic switch points that become more sensitive with temperature, hence offsetting the usual degradation of the magnetic field with temperature.
The symmetry capability makes these devices ideal for use in pulse-counting applications where duty cycle is an important parameter.
The four basic devices (3185, 3187, 3188, and 3189) are identical except for magnetic switch points.
Each device includes on a single silicon chip a voltage regulator, quadratic Hall-voltage generator, temperature compensation circuit, signal amplifier, Schmitt trigger, and a buffered open-collector output to sink up to 25 mA.
The on-board regulator permits operation with supply voltages of 3.
8 to 24 volts.
The first character of the part number suffix determines the device operating temperature range.
Suffix ‘E–’ is for -40°C to +85°C, and suffix ‘L–’ is for -40°C to +150°C.
Three package styles provide a magnetically optimized package for most applications.
Suffix ‘–LT’ is a miniature SOT89/TO-243AA transistor package for surface-mount applications; suffix ‘–U’ is a three-lead plastic mini-SIP, while suffix ‘–UA’ is a three-lead ultra-miniSIP.
Data Sheet 27609.
2A V X CC 1 2 3 GROUND Dwg.
PH-003A Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS at TA = +25°C Supply Voltage, VCC .
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30 V Reverse Battery Voltage, VRCC .
-30 V Magnetic Flux Density, B .
Unlimited Output OFF Voltage, VOUT .
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30 V Reverse Output Voltage, VOUT .
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