Product Overview
The A1120, A1121, A1122, A1123, and A1125 are highly temperature-stable and stress-resistant unipolar Hall-effect switches designed for operation in extended temperature ranges up to 150C. These devices feature dynamic offset cancellation for superior high-temperature performance, reducing residual offset voltage caused by overmolding, temperature dependencies, and thermal stress. Integrated components include a voltage regulator, Hall-voltage generator, amplifier, chopper stabilization, Schmitt trigger, and a short-circuit protected open-drain output capable of sinking up to 25 mA. The devices operate from a wide supply voltage range of 3 to 24 V, with the lower limit allowing for 3V applications or enhanced protection against voltage transients. The A1120-A1123 activate the output with a sufficient south pole magnetic field, while the A1125 is complementary, deactivating the output with a south pole. Available in SOT23W (LH) and ultra-mini SIP (UA) packages, these lead-free components are suitable for various mounting requirements.
Product Attributes
- Brand: Allegro MicroSystems
- Certifications: AEC-Q100 automotive qualified
- Material: Silicon chip
- Package Types: 3-pin SOT23W (LH), 3-pin SIP (UA)
- Lead Finish: 100% matte-tin-plated leadframe
- Lead-Free: Yes (suffix T)
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 | VOUT = 24 V, B < BRP (A1120-A1123) | 10 | A | ||
| Output Leakage Current | IOUTOFF | VOUT = 24 V, B > BOP (A1125) | 10 | A | ||
| Output Saturation Voltage | VOUT(SAT) | IOUT = 20 mA, B > BOP (A1120-A1123) | 185 | 500 | mV | |
| Output Saturation Voltage | VOUT(SAT) | IOUT = 20 mA, B < BRP (A1125) | 185 | 500 | mV | |
| Output Current Limit | IOM | B > BOP (A1120-A1123) | 30 | 60 | mA | |
| Output Current Limit | IOM | B < BRP (A1125) | 30 | 60 | mA | |
| Power-On Time | tPO | VCC > 3.0 V | 25 | s | ||
| Chopping Frequency | fC | 800 | kHz | |||
| 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 | 4 | mA | ||
| Supply Current (OFF) | ICC(OFF) | VCC = 12 V | 4 | mA | ||
| Reverse Supply Current | IRCC | VRCC = 30 V | 5 | mA | ||
| Supply Zener Clamp Voltage | VZ | ICC = 5 mA; TA = 25C | 28 | V | ||
| Zener Impedance | IZ | ICC = 5 mA; TA = 25C | 50 | |||
| 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) | (BOP BRP) | 10 | G | ||
| Hysteresis | BHYS (A1121) | (BOP BRP) | 10 | 25 | 42 | G |
| Hysteresis | BHYS (A1122) | (BOP BRP) | 10 | 25 | 42 | G |
| Hysteresis | BHYS (A1123) | (BOP BRP) | 30 | 55 | 80 | G |
| Hysteresis | BHYS (A1125) | (BOP BRP) | 10 | G |
2410010330_ALLEGRO-A1120LLHLT-T_C459230.pdf
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