Product Overview
The A1126 is an omnipolar, ultrasensitive Hall-effect switch with a digital output, designed for reliable operation across extended temperature ranges up to 150C. It features a dynamic offset cancellation technique for superior high-temperature performance, making it insensitive to physical stress and temperature excursions. The device integrates a voltage regulator, Hall-voltage generator, amplifier, chopper stabilization, Schmitt trigger, and a short-circuit-protected open-drain output on a single silicon chip. Its omnipolar operation allows activation by either north or south magnetic polarity, simplifying manufacturing and making it an excellent replacement for reed switches in industrial, consumer, and automotive applications.
Product Attributes
- Brand: Allegro MicroSystems
- Certifications: AEC-Q100 automotive qualified
- Material: Advanced BiCMOS wafer fabrication
- Package Types: 3-pin SOT23W (LH), 3-pin SIP (UA)
- Lead Finish: 100% matte-tin-plated leadframe
- Lead Free: Yes
Technical Specifications
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
| Supply Voltage | VCC | Operating, TJ < 165C | 3 | 24 | V | |
| Output Leakage Current | IOUTOFF | VOUT = 24 V, B < BRPS | 10 | A | ||
| Output On Voltage | VOUT(SAT) | IOUT = 20 mA, B > BOP | 185 | 500 | mV | |
| Output Current Limit | IOM | B > BOP | 30 | 60 | mA | |
| Power-On Time | tPO | 25 | s | |||
| Chopping Frequency | fC | 800 | kHz | |||
| Output Rise Time | tr | RLOAD = 820 , CS = 20 pF | 0.2 | 2 | s | |
| Output Fall Time | tf | RLOAD = 820 , CS = 20 pF | 0.1 | 2 | s | |
| Supply Current (On) | ICC(ON) | B > BOP , VCC = 12 V | 4 | mA | ||
| Supply Current (Off) | ICC(OFF) | B < BRP , VCC = 12 V | 4 | mA | ||
| Supply Zener Clamp Voltage | VZ | ICC = 6.5 mA; TA = 25C | 28 | V | ||
| Supply Zener Current | IZSUPPLY | VS = 28 V | 6.5 | mA | ||
| Operate Point (South) | BOPS | South pole adjacent to branded face | 15 | 38 | 55 | G |
| Operate Point (North) | BOPN | North pole adjacent to branded face | 55 | 38 | 15 | G |
| Release Point (South) | BRPS | South pole adjacent to branded face | 5 | 20 | 50 | G |
| Release Point (North) | BRPN | North pole adjacent to branded face | 50 | 20 | 5 | G |
| Hysteresis | BHYS | | BOPS BRPS |, | BOPN BRPN | | 5 | 30 | G |
2404151028_ALLEGRO-A1126LLHLX-T_C459233.pdf
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