3189
3189 is HALL-EFFECT LATCHES manufactured by Allegro MicroSystems.
- Part of the 3185 comparator family.
- Part of the 3185 comparator family.
Data Sheet 27609.2c
- 3185 THRU 3189
HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION
V CC
OUTPUT
GROUND
SUPPLY
Dwg. PH-003A
Pinning is shown viewed from branded side.
These Hall-effect latches are extremely temperature-stable and stressresistant devices 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 pensating for temperature changes in the Hall element. Additionally, internal pensation provides magnetic switch points that bee 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 pensation circuit, signal amplifier, Schmitt trigger, and a buffered open-collector output to sink up to 25 m A. 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 ‘- UA’ is a three-lead ultra-mini-SIP....
