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A3251 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A3251 Datasheet(HTML) 1 Page - Allegro MicroSystems |
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1 / 15 page  A3250 and A3251 A3250-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 115 Northeast Cutoff, Box 15036 www.allegromicro.com Allegro MicroSystems, Inc. ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC ......................................26.5 V Reverse-Supply Voltage, VRCC ........................–18 V Zener Overvoltage, VZ.......................................30 V Output Current, IOUT.........................................20 mA Magnetic Flux Density, B .........................Unlimited Operating Temperature Ambient, TA, Range J................. –40ºC to 115ºC Ambient, TA, Range L................–40ºC to 150ºC Maximum Junction, TJ(max)........................165ºC Storage Temperature, TS ..................–65ºC to 170ºC On-chip protection against: Supply transients Output short-circuits Reverse-battery condition Field-Programmable, Chopper-Stabilized Unipolar Hall-Effect Switches Features and Benefits The A3250 and A3251 are field-programmable, chopper-stabilized, unipolar Hall- effect switches designed for use in high-temperature applications. These devices use a chopper-stabilization technique to eliminate offset inherent in single-element devices. The A3250 and A3251 are externally programmable devices. The devices have a wide range of programmability of the magnetic operate point (BOP) while the hys- teresis remains fixed. This advanced feature allows for optimization of the sensor switchpoint and can drastically reduce the effects of variations found in a produc- tion environment, such as magnet and device placement tolerances. These devices provide on-chip transient protection. A Zener clamp on the power supply protects against overvoltage conditions on the supply line. These devices also include short-circuit protection on the output. The output of the A3250 switches LOW when subjected to a south-polarity mag- netic field with a flux density that exceeds the threshold for BOP, and switches HIGH when the field drops below the magnetic release point, BRP. The output of the A3251 has the opposite polarity, switching HIGH in a south-polarity magnetic field that BOP, and switching LOW when the field drops below BRP. The other differences in the devices are the power-on state. The A3250 powers-on in the HIGH state, while the A3251 powers-on in the LOW state. These devices are available in a TO-92 three-lead ultra-mini SIP (Single In-line Package), with either straight or formed and trimmed lead configuration. 1. VCC 2. GND 3. VOUT Package UA, 3-pin SIP Chopper stabilization for stable switchpoints throughout operating temperature range Externally programmable operate point (through VCC pin) On-board voltage regulator for 4.2 V to 24 V operation 23 1 TL Option Part Number Package TA (ºC) Bhys(typ) (G) VOUT Power-On Running* A3250JUA A3250JUATL Straight lead Formed lead –40 to 115 18 High Low A3250LUA A3250LUATL Straight lead Formed lead –40 to 150 13 A3251JUA A3251JUATL Straight lead Formed lead –40 to 115 18 Low High A3251LUA A3251LUATL Straight lead Formed lead –40 to 150 13 *In south polarity magnetic field of sufficient strength. Use the following complete part numbers when ordering: |
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