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A3281LT Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A3281LT Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 12 page The A3280--, A3281--, and A3283-- Hall-effect latches are ex- tremely temperature-stable and stress-resistant sensors especially suited for operation over extended temperature ranges to +150 °C. Superior high-temperature performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. The three devices are identical except for magnetic switch points. Each device includes on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit protected open-collector output to sink up to 25 mA. A south pole of sufficient strength will turn the output on. A north pole is necessary to turn the output off. An on-board regulator permits operation with supply voltages of 4.2 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 ‘L–’ is -40 °C to +150°C. Three package styles provide a magnetically optimized package for most applications. Suffix ‘–LH’ is a miniature low-profile surface-mount package, ‘–LT’ is a miniature SOT-89/TO- 243AA transistor package for surface-mount applications; while suffix ‘–UA’ is a three-lead ultra-mini-SIP for through-hole mounting. FEATURES I Symmetrical Switch Points I Resistant to Physical Stress I Superior Temperature Stability I Output Short-Circuit Protection I Operation From Unregulated Supply I Reverse Battery Protection I Solid-State Reliability I Small Size 3280, 3281, AND 3283 Supply Voltage, VCC ........................ 26.5 V Reverse Battery Voltage, VRCC .......... -30 V Magnetic Flux Density, B ........... Unlimited Output Off Voltage, VOUT ................... 26 V Continuous Output Current, IOUT ....................... Internally Limited Reverse Output Current, IOUT ........ -50 mA Package Power Dissipation, PD . See Graph Junction Temperature, TJ ............... +170 °C Operating Temperature Range, TA Suffix ‘E–’ .................. -40 °C to +85°C Suffix ‘L–’ ................ -40 °C to +150°C Storage Temperature Range, TS .............................. -65 °C to +170°C ABSOLUTE MAXIMUM RATINGS at TA = +25°C Pinning is shown viewed from branded side. Always order by complete part number: the prefix ‘A’ + the basic four- digit part number + a suffix to indicate operating temperature range + a suffix to indicate package style, e.g., A3281ELH . CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES Dwg. PH-003-2 1 V CC 3 2 PTCT Suffix '–LT' & '–UA' Pinning |
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