A1120, A1121, A1122, A1123, and A1125 Chopper-Stabilized Precision Hall-Effect Switches FEATURES AND BENEFITS DESCRIPTION AEC-Q100 automotive qualified The A1120, A1121, A1122, A1123, and A1125 Hall-effect Unipolar switch points unipolar switches are extremely temperature-stable and Resistant to physical stress stress-resistant sensor ICs, especially suited for operation Superior temperature stability over extended temperature ranges to 150C. Superior high- Output short-circuit protection temperature performance is made possible through dynamic Operation from unregulated supply offset cancellation, which reduces the residual offset voltage Reverse-battery protection normally caused by device overmolding, temperature Solid-state reliability dependencies, and thermal stress. Small package sizes 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-drain output to sink up to 25 mA. PACKAGES: Not to scale An on-board 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. NOT FOR For the A1120, A1121, A1122, and A1123, a south pole of NEW DESIGN sufficient strength turns the output on. Removal of the magnetic field turns the output off. The A1125 is complementary, in that for these devices, a south pole turns the A1125 output off, and 3-pin SOT23W removal of the magnetic field turns the output on. (suffix LH) 3-pin SIP, 3-pin SIP, Two package styles provide a magnetically optimized package matrix HD style chopper style for most applications. Package type LH is a modified SOT23W, (suffix UA) (suffix UA) surface-mount package, while UA is a three-lead ultra-mini SIP for through-hole mounting. Each package type is lead (Pb) free (suffix, T), with a 100% matte-tin-plated leadframe. Functional Block Diagram VCC Regulator To All Subcircuits VOUT Low-Pass Filter Amp Control Current Limit GND A1120-DS, Rev. 19 March 6, 2020 MCO-0000417 Dynamic Offset Cancellation Sample and HoldA1120, A1121, A1122, Chopper-Stabilized Precision Hall-Effect Switches A1123, and A1125 SELECTION GUIDE Switchpoints Ambient, T Output In South (Positive) A 1 (Typ.) (G) Part Number Packing Mounting (C) Magnetic Field B B OP RP A1120ELHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1120ELHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40 to 85 3 A1120EUA-T Bulk, 500 pieces/bag 3-pin SIP through hole 35 25 A1120LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1120LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40 to 150 3 A1120LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1121ELHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1121ELHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40 to 85 3 A1121EUA-T Bulk, 500 pieces/bag 3-pin SIP through hole 95 70 A1121LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1121LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40 to 150 On (logic low) 3 A1121LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1122ELHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1122ELHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40 to 85 3 A1122EUA-T Bulk, 500 pieces/bag 3-pin SIP through hole 150 125 A1122LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1122LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40 to 150 3 A1122LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1123LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1123LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40 to 150 280 225 3 A1123LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole A1125ELHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1125ELHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40 to 85 3 A1125EUA-T Bulk, 500 pieces/bag 3-pin SIP through hole 35 25 Off (logic high) A1125LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 2 A1125LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40 to 150 3 A1125LUA-T Bulk, 500 pieces/bag 3-pin SIP through hole 1 Contact Allegro for additional packing options. 2 Available through authorized Allegro distributors only. 3 The chopper-style UA package is not for new design the matrix HD style UA package is recommended for new designs. 2 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com