A1220, A1221, A1222, and A1223 Chopper Stabilized Precision Hall Effect Latches Features and Benefits Description Symmetrical latch switchpoints The A1220, A1221, A1222, and A1223 Hall-effect sensor ICs Resistant to physical stress are extremely temperature-stable and stress-resistant devices Superior temperature stability especially suited for operation over extended temperature ranges Output short-circuit protection to 150C. Superior high-temperature performance is made Operation from unregulated supply down to 3 V possible through dynamic offset cancellation, which reduces the Reverse battery protection residual offset voltage normally caused by device overmolding, Solid-state reliability temperature dependencies, and thermal stress. Each device Small package sizes 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-drain output to sink up to 25 mA. A south pole of sufficient strength turns the output on. A north pole of sufficient strength is necessary to turn the output off. Packages: An onboard regulator permits operation with supply voltages of 3 to 24 V. The advantage of operating down to 3 V is that the device can be used in 3-V applications or with additional external resistance in series with the supply pin for greater protection against high voltage transient events. Two package styles provide magnetically optimized packages 3-pin SOT23W (suffix LH) for most applications. Package type LH is a modified 3-pin SOT23W surface mount package while UA is a three-pin ultra- mini SIP for through hole mounting. Both packages are lead 3-pin SIP (suffix UA) (Pb) free, with 100% matte tin plated leadframes. Not to scale Functional Block Diagram VCC Regulator To All Subcircuits VOUT Low-Pass Filter Amp Control Current Limit GND A1220-DS, Rev. 11 Dynamic Offset Cancellation Sample and HoldA1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 Selection Guide 1 Part Number Packing Mounting Ambient, T B (Min) B (Max) A RP OP A1220ELHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1220ELHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40C to 85C A1220EUA-T Bulk, 500 pieces/bag 3-pin SIP through hole 40 40 A1220LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1220LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40C to 150C A1220LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1221ELHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1221ELHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40C to 85C A1221EUA-T Bulk, 500 pieces/bag 3-pin SIP through hole 90 90 A1221LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1221LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40C to 150C A1221LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1222ELHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40C to 85C 2 A1222ELHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount A1222LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 150 150 2 A1222LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 40C to 150C A1222LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1223ELHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40C to 85C 2 A1223ELHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount A1223LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 180 180 2 A1223LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 40C to 150C A1223LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole 1 Contact Allegro for additional packing options. 2 Available through authorized Allegro distributors only. Allegro MicroSystems, Inc. 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com