Product Overview
The A1120, A1121, A1122, A1123, and A1125 are highly temperature-stable and stress-resistant Hall-effect unipolar switches, ideal for operation in 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 supply voltages of 3 to 24 V, offering flexibility for 3 V applications or enhanced protection against voltage transients. The A1120-A1123 activate their output with a sufficient south pole magnetic field, while the A1125 is complementary, deactivating its output with a south pole. Available in surface-mount SOT23W (LH) and through-hole SIP (UA) packages, all variants are lead (Pb) free with matte-tin plating.
Product Attributes
- Brand: Allegro MicroSystems
- Certifications: AEC-Q100 automotive qualified
- Material: Silicon chip, Matte-tin-plated leadframe
- Package Styles: SOT23W (LH), SIP (UA)
- Lead Free: Yes (suffix T)
Technical Specifications
| Part Number | Package | Mounting | Ambient Temp. (C) | Switchpoints Typ. (G) | Output In South Pole | BOP (G) | BRP (G) |
| A1120ELHLX-T | 3-pin SOT23W | Surface Mount | 40 to 85 | 35 | On (logic low) | 35 | 25 |
| A1120LLHLX-T | 3-pin SOT23W | Surface Mount | 40 to 150 | 35 | On (logic low) | 35 | 25 |
| A1120EUA-T | 3-pin SIP | Through Hole | 40 to 85 | 35 | On (logic low) | 35 | 25 |
| A1120LUA-T | 3-pin SIP | Through Hole | 40 to 150 | 35 | On (logic low) | 35 | 25 |
| A1121ELHLX-T | 3-pin SOT23W | Surface Mount | 40 to 85 | 95 | On (logic low) | 95 | 70 |
| A1121LLHLX-T | 3-pin SOT23W | Surface Mount | 40 to 150 | 95 | On (logic low) | 95 | 70 |
| A1121EUA-T | 3-pin SIP | Through Hole | 40 to 85 | 95 | On (logic low) | 95 | 70 |
| A1121LUA-T | 3-pin SIP | Through Hole | 40 to 150 | 95 | On (logic low) | 95 | 70 |
| A1122ELHLX-T | 3-pin SOT23W | Surface Mount | 40 to 85 | 150 | On (logic low) | 150 | 125 |
| A1122LLHLX-T | 3-pin SOT23W | Surface Mount | 40 to 150 | 150 | On (logic low) | 150 | 125 |
| A1122EUA-T | 3-pin SIP | Through Hole | 40 to 85 | 150 | On (logic low) | 150 | 125 |
| A1122LUA-T | 3-pin SIP | Through Hole | 40 to 150 | 150 | On (logic low) | 150 | 125 |
| A1123LLHLX-T | 3-pin SOT23W | Surface Mount | 40 to 150 | 280 | On (logic low) | 280 | 225 |
| A1123LUA-T | 3-pin SIP | Through Hole | 40 to 150 | 280 | On (logic low) | 280 | 225 |
| A1125ELHLX-T | 3-pin SOT23W | Surface Mount | 40 to 85 | 35 | Off (logic high) | 35 | 25 |
| A1125LLHLX-T | 3-pin SOT23W | Surface Mount | 40 to 150 | 35 | Off (logic high) | 35 | 25 |
| A1125EUA-T | 3-pin SIP | Through Hole | 40 to 85 | 35 | Off (logic high) | 35 | 25 |
| A1125LUA-T | 3-pin SIP | Through Hole | 40 to 150 | 35 | Off (logic high) | 35 | 25 |
| 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, B > BOP (A1120-A1123) | 4 | mA | ||
| Supply Current (ON) | ICC(ON) | VCC = 12 V, B < BRP (A1125) | 4 | mA | ||
| Supply Current (OFF) | ICC(OFF) | VCC = 12 V, B < BRP (A1120-A1123) | 4 | mA | ||
| Supply Current (OFF) | ICC(OFF) | VCC = 12 V, B > BOP (A1125) | 4 | mA | ||
| Hysteresis | BHYS | (BOP BRP) | 10 to 55 | G | ||
| Package Thermal Resistance | RJA | Package LH, 1-layer PCB | 228 | C/W | ||
| Package Thermal Resistance | RJA | Package LH, 2-layer PCB | 110 | C/W | ||
| Package Thermal Resistance | RJA | Package UA, 1-layer PCB | 165 | C/W |
2410010403_ALLEGRO-A1122LUA-T_C459231.pdf
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