Product Overview
The A1120, A1121, A1122, A1123, and A1125 are temperature-stable and stress-resistant unipolar Hall-effect switches designed for operation over extended temperature ranges up to 150C. Featuring dynamic offset cancellation for superior high-temperature performance, these ICs integrate a voltage regulator, Hall-voltage generator, amplifier, chopper stabilization, Schmitt trigger, and a short-circuit protected open-drain output. They operate from a 3 to 24 V supply, offering compatibility with 3 V applications and enhanced protection against voltage transients. The A1120-A1123 activate with a sufficient south pole, while the A1125 is complementary. Available in SOT23W (LH) and SIP (UA) packages, these lead-free devices are suitable for various applications requiring reliable magnetic sensing.
Product Attributes
- Brand: Allegro MicroSystems
- Certifications: AEC-Q100 automotive qualified
- Material: Lead (Pb) free, 100% matte-tin-plated leadframe
- Package Styles: 3-pin SOT23W (LH), 3-pin SIP (UA)
- Origin: U.S.A.
Technical Specifications
| Part Number | Mounting | Ambient Temp (C) | Switchpoints (Typ.) (G) | Output In South (Positive) Magnetic Field |
| A1120ELHLX-T | 3-pin SOT23W surface mount | 40 to 85 | 35 | On (logic low) |
| A1120LLHLX-T | 3-pin SOT23W surface mount | 40 to 150 | 35 | On (logic low) |
| A1120EUA-T | 3-pin SIP through hole | 40 to 85 | 35 | On (logic low) |
| A1120LUA-T | 3-pin SIP through hole | 40 to 150 | 35 | On (logic low) |
| A1121ELHLX-T | 3-pin SOT23W surface mount | 40 to 85 | 95 | On (logic low) |
| A1121LLHLX-T | 3-pin SOT23W surface mount | 40 to 150 | 95 | On (logic low) |
| A1121EUA-T | 3-pin SIP through hole | 40 to 85 | 95 | On (logic low) |
| A1121LUA-T | 3-pin SIP through hole | 40 to 150 | 95 | On (logic low) |
| A1122ELHLX-T | 3-pin SOT23W surface mount | 40 to 85 | 150 | On (logic low) |
| A1122LLHLX-T | 3-pin SOT23W surface mount | 40 to 150 | 150 | On (logic low) |
| A1122EUA-T | 3-pin SIP through hole | 40 to 85 | 150 | On (logic low) |
| A1122LUA-T | 3-pin SIP through hole | 40 to 150 | 150 | On (logic low) |
| A1123LLHLX-T | 3-pin SOT23W surface mount | 40 to 150 | 280 | On (logic low) |
| A1123LUA-T | 3-pin SIP through hole | 40 to 150 | 280 | On (logic low) |
| A1125ELHLX-T | 3-pin SOT23W surface mount | 40 to 85 | 35 | Off (logic high) |
| A1125LLHLX-T | 3-pin SOT23W surface mount | 40 to 150 | 35 | Off (logic high) |
| A1125EUA-T | 3-pin SIP through hole | 40 to 85 | 35 | Off (logic high) |
| A1125LUA-T | 3-pin SIP through hole | 40 to 150 | 35 | Off (logic high) |
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
| Forward Supply Voltage | VCC | Operating, TJ < 165C | 3 | 24 | V | |
| Output Leakage Current | IOUTOFF | A1120-A1123, VOUT = 24 V, B < BRP | 10 | A | ||
| Output Leakage Current | IOUTOFF | A1125, VOUT = 24 V, B > BOP | 10 | A | ||
| Output Saturation Voltage | VOUT(SAT) | IOUT = 20 mA, B > BOP (A1120-A1123) / B < BRP (A1125) | 185 | 500 | mV | |
| Output Current Limit | IOM | B > BOP (A1120-A1123) / B < BRP (A1125) | 30 | 60 | mA | |
| Power-On Time | tPO | VCC > 3.0 V, B < BRP(min) / B > BOP(max) | 25 | s | ||
| Output Rise Time | tr | RL = 820 , CS = 20 pF | 0.2 | 2 | s | |
| Output Fall Time | tf | RL = 820 , CS = 20 pF | 0.1 | 2 | s | |
| Supply Current (ON) | ICC(ON) | VCC = 12 V, B > BOP (A1120-A1123) / B < BRP (A1125) | 4 | mA | ||
| Supply Current (OFF) | ICC(OFF) | VCC = 12 V, B < BRP (A1120-A1123) / B > BOP (A1125) | 4 | mA | ||
| Reverse Supply Current | IRCC | VRCC = 30 V | -5 | mA | ||
| Operate Point | BOP | A1120 | 35 | 50 | G | |
| Operate Point | BOP | A1121 | 50 | 95 | 135 | G |
| Operate Point | BOP | A1122 | 120 | 150 | 200 | G |
| Operate Point | BOP | A1123 | 205 | 280 | 355 | G |
| Operate Point | BOP | A1125 | 35 | 50 | G | |
| Release Point | BRP | A1120 | 5 | 25 | G | |
| Release Point | BRP | A1121 | 40 | 70 | 110 | G |
| Release Point | BRP | A1122 | 110 | 125 | 190 | G |
| Release Point | BRP | A1123 | 150 | 225 | 300 | G |
| Release Point | BRP | A1125 | 5 | 25 | G | |
| Hysteresis | BHYS | A1120 | 10 | G | ||
| Hysteresis | BHYS | A1121 | 10 | 25 | 42 | G |
| Hysteresis | BHYS | A1122 | 10 | 25 | 42 | G |
| Hysteresis | BHYS | A1123 | 30 | 55 | 80 | G |
| Hysteresis | BHYS | A1125 | 10 | G |
2410010303_ALLEGRO-A1120ELHLT-T_C146407.pdf
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